Systemic steroid pretreatment without presteroid WBC documentation Known intolerance to steroid therapy Current systemic steroid therapy other than physiologic replacement (i.e. prednisone ? 10 mg or equivalent). Inhaled or topical steroid use is allowed. Patients who are planned to receive concurrent growth factor, systemic steroid or other immunosuppressive therapy or cytotoxic agent Patients receiving systemic steroid therapy or any other systemic immunosuppressive medication. Local steroid therapies are acceptable Systemic steroid therapy or any immunosuppressive therapy Systemic steroid or other immunosuppressive therapy within 4 weeks of starting the study Receiving systemic steroid therapy or any other form of systemic immunosuppressive therapy =< 7 days prior to registration; EXCEPTIONS:\r\n* Low doses of steroids (=< 20 mg of prednisone or equivalent dose of other steroid/day)\r\n* Previous use of corticosteroids is allowed\r\n* After initiation of MK-3475 therapy, steroid can be used for management of potential immune mediated adverse events (AE) for less than 8 weeks of therapy\r\n* Topical, ocular, intra-articular, intranasal, and inhalational corticosteroids (with minimal systemic absorption) are permitted Concurrent systemic steroid therapy Concurrent systemic steroid therapy Concurrent systemic steroid therapy; (NOTE: Patients with recurrent glioblastoma who require steroids for clinical indications are eligible) Concurrent systemic steroid therapy. Known intolerance to the required dose and schedule of steroid therapy as determined by the investigator Evidence of clinically significant immunosuppression such as the following:\r\n* Primary immunodeficiency state such as severe combined immunodeficiency disease\r\n* Concurrent opportunistic infection\r\n* Receiving systemic immunosuppressive therapy (> 2 weeks) including oral steroid doses > 10 mg/day of prednisone or equivalent within 7 days prior to enrollment; however, in the setting of non-immune mediated indications for steroid use, chronic/active low dose steroid use may be permitted at the discretion of the principal investigator; the dose of steroid allowed in this setting is also at the discretion of the principal investigator; (use of inhaled or topical steroids is permitted) Systemic steroid therapy required, except for patients with glioblastoma (cohort 4) Concurrent systemic steroid therapy No systemic steroid or steroid eye drop use within 2 weeks prior to initiation of experimental therapy; limited doses of systemic steroids to prevent IV contrast, allergic reaction or anaphylaxis (in patients who have known contrast allergies) are allowed Has received more than one systemic treatment for steroid refractory aGvHD. Concurrent systemic steroid therapy Concurrent systemic steroid therapy Systemic steroid therapy Systemic steroid therapy unless for physiologic replacement Concurrent systemic steroid therapy Concurrent systemic steroid therapy Have received systemic corticosteroids (used in the management of cancer or non-cancer-related illnesses) within one week prior to first dose; Note: systemic steroid therapy is allowed for subjects on replacement therapy as long as prednisone =< 10 mg or its steroid equivalent, and those patients should continue at the same dose through the trial Systemic steroid therapy or immunosuppressive therapy within 14 days before vaccine administration ADDITIONAL CRITERIA FOR STUDY CONTINUATION: Systemic steroid or immunosuppressive therapy within 14 days before vaccine administration Concurrent systemic steroid therapy Concurrent systemic steroid therapy Concurrent systemic steroid therapy Require steroid therapy or steroid-containing compounds, or have used systemic steroids in the past 4 weeks, or have used topical or inhalational steroids in the past 2 weeks prior to lymphodepletion; the exception being patients on chronic physiologic dose of steroid (Turnstile II) Systemic or topical steroid use or other immunosuppressive therapy within the past 14 days Systemic steroid therapy within 28 days before vaccine administration Anticipated need for systemic steroid therapy within 28 days after vaccine administration Require steroid therapy or steroid-containing compounds, or have used systemic steroids in the past 30 days, or have used topical or inhalational steroids in the past 2 weeks prior to lymphodepletion; Exception: patients on physiologic dose of steroid (Turnstile II - Chemotherapy/Cell Infusion Exclusion Criteria) History of organ transplant requiring immunosuppression; or history of pneumonitis or interstitial lung disease requiring treatment with systemic steroids; or a history of receiving systemic steroid therapy or any other immunosuppressive medication ? 3 days prior to study initiation. Daily steroid replacement therapy (eg, prednisone or hydrocortisone) and corticosteroid use to manage AEs are permitted. Concurrent systemic steroid therapy Patients who received most recent therapy =< 4 weeks prior to registration; NOTE: use of systemic steroid therapy is allowed pretreatment Concurrent systemic steroid therapy Known intolerance to steroid therapy Concurrent systemic steroid therapy Patients requiring concurrent systemic steroid therapy higher than physiologic dose (7.5 mg/day of prednisone). Patients receiving systemic treatment with systemic steroid therapy or any other immunosuppressive medication at any dose level that would interfere with the action of the study drugs in the opinion of the investigator Chronic use of steroid therapy. Known intolerance to steroid therapy Steroid dose increased in the most recent two weeks Known intolerance to steroid therapy No systemic steroid or steroid eye drop use within 2 weeks prior to initiation of experimental therapy; limited doses of systemic steroids to prevent intravenous (IV) contrast, allergic reaction or anaphylaxis (in patients who have known contrast allergies) are allowed Known intolerance to steroid therapy Patients who are immunocompromised as listed as follows:\r\n* Human immunodeficiency virus positivity\r\n* Chronic administration (defined as daily or every other day for continued use > 14 days) of systemic corticosteroids (including steroid eye drops) or other immune suppressive drugs, within 28 days before the first planned dose of PSA-TRICOM; nasal, or inhaled steroid, and topical steroid creams for small body areas are not excluded\r\n* Patients who have undergone allogeneic peripheral stem cell transplantation, or solid organ transplantation requiring immunosuppression \r\n* History of splenectomy Concurrent systemic steroid therapy Concurrent systemic or inhaled steroid therapy Concurrent systemic steroid therapy Concurrent systemic steroid therapy Concurrent systemic steroid therapy Current use of systemic steroid medication Concurrent systemic steroid therapy Concurrent systemic steroid therapy Systemic steroid or other immunosuppressive therapy within 4 weeks of starting the study Concurrent systemic steroid therapy Systemic steroid therapy requirement Their neurological function is stable for at least 30 days and either off steroid therapy or on a stable steroid regimen. Concurrent systemic steroid therapy higher than physiologic dose (> 7.5 mg/day of prednisone) Concurrent systemic steroid therapy Concurrent systemic steroid therapy History of steroid psychosis Caregivers : No steroid medications Known intolerance of topical steroid preparations Patient on steroid therapy Chronic steroid use Any oral steroid use within 2 weeks of testing Known intolerance to steroid therapy Patients may not have a need for chronic systemic steroid therapy Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment. The use of physiologic doses of corticosteroids (up to 7.5mg/d of prednisone or equivalent) may be approved after consultation with the sponsor. Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment. The use of physiologic doses of corticosteroids may be approved after consultation with the Sponsor. Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment. The use of physiologic doses of corticosteroids may be approved after consultation with the Sponsor. Has a diagnosis of immunodeficiency or receiving systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment. The use of physiologic doses of corticosteroids may be approved after consultation with the Sponsor. Subjects must not be receiving systemic steroid therapy or any other form of immunosuppressive therapy within 2 weeks prior to the first dose of study medication; the use of physiologic doses of corticosteroids is acceptable Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment; the use of physiologic doses of corticosteroids may be approved after consultation with the sponsor Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment; the use of physiologic doses of corticosteroids may be approved after consultation with the principal investigator (PI) and Merck Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment; the use of physiologic doses of corticosteroids (prednisone 10 mg or equivalent) may be approved after consultation with the sponsor Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drugs. The use of physiologic doses of corticosteroids may be approved after consultation with the Sponsor. Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study therapy; the use of physiologic doses of corticosteroids may be approved after consultation with the study principal investigator (PI) Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within seven days prior to the first dose of trial treatment. The use of physiologic doses of corticosteroids may be approved after consultation with the Sponsor. Has a diagnosis of immunodeficiency or is receiving any systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to Day 1 of trial treatment. The use of physiologic doses of corticosteroids may be approved after consultation with the Sponsor. Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study medication (physiologic doses of corticosteroids may be approved after consultation with the Sponsor) Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment; the use of physiologic doses of corticosteroids may be approved after consultation with the sponsor Has a diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment. The use of physiologic doses of corticosteroids may be approved after consultation with the Sponsor. Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment. The use of physiologic doses of corticosteroids may be approved after consultation with the sponsor. Diagnosis of immunosuppression or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment; the use of physiologic doses of corticosteroids may be approved after consultation with the sponsor Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment; subjects requiring systemic steroids are excluded from the trial; the use of physiologic doses of corticosteroids may be approved after discussion with the sponsor Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment; subjects requiring systemic steroids are excluded from the trial; the use of physiologic doses of corticosteroids may be approved after discussion with the sponsor Diagnosis of immunosuppression or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to enrollment . The use of physiologic doses of corticosteroids may be approved after consultation with the sponsor. Systemic steroid therapy (>10 mg daily prednisone or equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment (Note: topical, inhaled, nasal and ophthalmic steroids are not prohibited). Diagnosis of immunodeficiency or is receiving systemic steroid therapy (>10 mg of prednisone or equivalent) or any other form of immunosuppressive therapy (including immune modulators or systemic corticosteroids) that cannot be discontinued safely within 14 days prior to study enrollment Patient has a diagnosis of immunodeficiency, or is receiving systemic steroid therapy (> 10 mg prednisone daily, or steroid equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of avelumab On chronic systemic steroid therapy (>10 mg/day prednisone or equivalent) within 2 weeks prior to first dose of study drug or on any other form of immunosuppressive medication Has a diagnosis of immunodeficiency or is receiving any form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment or is taking chronic systemic steroids (in doses exceeding 10 mg daily of prednisone equivalent) within 7 days prior to the first dose of trial treatment; Note: Subjects with asthma or chronic obstructive pulmonary disease that require intermittent use of bronchodilators, inhaled steroids, or local steroid injections are not excluded from the study Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (i.e., doses exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior the first dose of study therapy Patients receiving steroid treatment exceeding replacement dosing Patients requiring systemic steroid therapy or any immunosuppressive therapy (?10mg/day prednisone or equivalent) which cannot be discontinued at least 7 days prior to first dose of study treatment. Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone or equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of pembrolizumab Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment (with the exception of daily dexamethasone =< 4 mg) Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of MK-3475 Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drug Participants must not have a diagnosis of immunodeficiency or is receiving systemic steroid therapy at a dose of > 10 mg prednisone daily or equivalent at time of first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment therapy;\r\n* NOTE: Systemic steroid doses of ? 10 mg of prednisone daily or its equivalent are allowed in patients receiving physiologic replacement steroid doses Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment. Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior the first dose of study treatment. Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy (> 10 mg prednisone daily or equivalent) or any other form of immunosuppressive therapy prior to trial treatment; patients receiving systemic steroids at physiologic doses are permitted to enroll assuming steroid dose is not above the acceptable threshold (> 10 mg prednisone daily or equivalent) Patients with evidence of clinically significant immunosuppression such as the following are ineligible:\r\n* Primary immunodeficiency state such as severe combined immunodeficiency disease\r\n* Concurrent opportunistic infection\r\n* Receiving systemic immunosuppressive therapy (> 2 weeks) including oral steroid doses > 10 mg/day of prednisone or equivalent within 2 months prior to enrollment Has a diagnosis of immunodeficiency, is receiving systemic steroids above physiologic dose (> 10 mg/day prednisone or equivalent) within 7 days of start of therapy or is receiving any other form of immunosuppressive therapy. Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy (at a dose greater than 10 mg/day of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment; systemic corticosteroids of less than 10 mg per day of prednisone (or equivalent) are allowed; topical corticosteroids are acceptable, including steroids with very low solubility administered nasally for local effects only (e.g. Nasonex) Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy at a dose of > 10 mg prednisone daily or equivalent at time of first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy at a dose of > 10 mg prednisone daily or equivalent at time of first dose of trial treatment Has a diagnosis of immunodeficiency or receiving steroid therapy of any other form of immunosuppressive therapy within 7 days prior to first dose of trial treatment; subjects who receive daily steroid replacement therapy serve as an exception to this rule; daily prednisone at doses of 5 to 7.5 mg (or hydrocortisone equivalent doses) is an example of replacement therapy Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy equivalent to >= 10 mg/day of prednisone, or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Evidence of clinically significant immunosuppression such as the following:\r\n* Primary immunodeficiency state such as severe combined immunodeficiency disease\r\n* HIV positive \r\n* Receiving systemic immunosuppressive therapy (> 2 weeks) including oral steroid doses > 10 mg/day of prednisone or equivalent within 2 months prior to enrollment\r\n* Concurrent opportunistic infection Patient has a diagnosis of immunodeficiency or is receiving systemic steroid therapy(> 10 mg prednisone daily, or steroid equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of pembrolizumab Evidence of clinically significant immunosuppression such as the following:\r\n* Primary immunodeficiency state such as severe combined immunodeficiency disease\r\n* Concurrent opportunistic infection\r\n* Receiving systemic immunosuppressive therapy (> 2 weeks) including oral steroid doses > 10 mg/day of prednisone or equivalent within 7 days prior to enrollment; however, in the setting of non-immune mediated indications for use, chronic/active low dose steroid use may be permitted at the discretion of the principal investigator Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of systemic immunosuppressive therapy within 7 days prior to the first dose of trial treatment, with the exception of steroids for adrenal insufficiency in which case prednisone =< 10 mg/day or its equivalent is allowed Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment, patients with human immunodeficiency virus (HIV) adequately controlled on antiretrovirals (undetectable viral load) and patients with chronic lymphocytic leukemia (CLL) not requiring systemic treatment will be included; in addition, steroids for physiologic replacement will be allowed (must be equal to or less than 10mg of prednisone/day) Administration of or condition requiring administration of systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to initiating study treatment; Exception: patients with conditions that can be managed with steroids equivalent to or less than an oral prednisone dose of 10 mg daily would not be excluded from the study Is receiving high dose systemic steroid therapy within 3 days of trial treatment; topical and intra-articular steroid injections are allowed, as are physiologic doses of systemic steroids (=< 10 mg of prednisone equivalent daily) Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of pembrolizumab Diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone or equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of MK-3475 Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy at a dose of > 10 mg prednisone daily or equivalent at time of first dose of trial treatment Primary immunodeficiency and need for chronic steroid therapy, exception: patients on chronic physiological dose of steroid equivalent to prednisone < 10 mg/day is allowed Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to initiation of lymphodepletion; exception: patients on chronic physiologic dose of steroid equivalent to prednisone < 10 mg/day is allowed Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy > 10 mg prednisone or equivalent per day or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment; Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy in excess of prednisone 10 mg/24 h equivalent, or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of protocol specified therapy. Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in doses exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drug. Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior the first dose of study treatment Diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior the first dose of study treatment. Participants with a diagnosis of immunodeficiency or who are receiving systemic steroid therapy (>= than 5 mg prednisone or its equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment Has a diagnosis of immunodeficiency or is receiving systemic immunosuppressive therapy within 7 days prior to the first dose of trial treatment; physiologic doses of steroid therapy (=< 10 mg/day prednisone equivalents) is allowed Has a diagnosis of immunodeficiency (including organ grafts and human immunodeficiency virus [HIV]), or is receiving systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drug (exceptions: nasal corticosteroids, inhaled steroids, adrenal replacement steroids and steroid creams are allowed) Diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior the first dose of study medication Has a diagnosis of immunodeficiency OR is receiving a systemic steroid therapy exceeding 10 mg daily dose of prednisone or equivalent or any other form of immunosuppressive therapy within 7 days prior to allocation, except in the case of central nervous system (CNS) metastases (see below). Has a diagnosis of immunodeficiency or is receiving systemic immunosuppressive therapy within 7 days prior to the first dose of trial treatment; physiologic doses of steroid therapy (=< 10 mg/day prednisone equivalents) is allowed Diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drug Diagnosis of immunodeficiency or is receiving systemic steroid therapy in dosing exceeding 10 mg daily of prednisone equivalent or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment. Has a diagnosis of immunodeficiency or is receiving chronic steroid therapy of prednisone ? 10 mg daily or any equivalent dose of corticosteroids. Has a diagnosis of immunodeficiency (HIV) or is receiving systemic steroid therapy (in excess of 20 mg of prednisone daily) or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment, or has a history of organ transplant, including allogeneic stem cell transplant Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy (i.e., dosing exceeding 10 mg daily of prednisone or equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment. Participants with a diagnosis of immunodeficiency or who are receiving chronic systemic steroid therapy (doses exceeding 10 mg/day of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment. Physiologic doses of corticosteroids (up to 10 mg/day of prednisone or equivalent) may be used during the study Has a diagnosis of immunodeficiency or is receiving immunosuppressive therapy within 7 days prior to the first dose of trial treatment; individuals who are receiving systemic steroid therapy at a stable dose less than or equal to 10mg of prednisone per day or its equivalent will be permitted to participate Has a history of a well-characterized and defined immune deficiency before the diagnosis of MF/SS or is receiving systemic steroid therapy greater than 10mg/day of prednisone or equivalent within 4 weeks or any other form of immunosuppressive therapy within 7 days before the first dose of trial treatment; the use of physiologic replacement doses of corticosteroids, along with topical, inhaled and local injection is discussed Patient must not have evidence of any clinically significant immunosuppression such as the following:\r\n* Primary immunodeficiency state such as severe combined immunodeficiency disease;\r\n* Concurrent opportunistic infection;\r\n* Receiving systemic immunosuppressive therapy (> 2 weeks) including oral steroid doses > 10 mg/day of prednisone or equivalent within 2 months prior to enrollment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy (> 10 mg of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Systemic steroid therapy or any immunosuppressive therapy (?10mg/day prednisone or equivalent). For Arms L (pembrolizumab) and M (nivolumab), subjects receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or other form of immunosuppressive therapy within 7 days before the first dose of study treatment; use of inhaled or topical steroids or systemic corticosteroids Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 14 days prior the first dose of study treatment. Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment A diagnosis of immunodeficiency or is currently receiving systemic steroid therapy at any dose or is receiving any other form of immunosuppressive therapy; steroid therapy is not allowed within 7 days prior to the first dose of trial treatment; however, topical and intranasal corticosteroids are allowed, and not an exclusion for participation Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy =< 7 days prior to the first dose of trial treatment COHORT 1: Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment COHORT 2: Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving either systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior the first dose of trial drug. Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy that exceeds a maximum amount of 10 mg of prednisone/day or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy for purposes of immunosuppression or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Diagnosis of immunodeficiency or receiving systemic steroid therapy or immunosuppressive therapy within 7 days prior to planned first dose of trial treatment. Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment. Has received systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment. Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency that requires receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment or has resulted in life threatening episodes previously regardless of current treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment; physiologic doses of steroid therapy (? 2 mg/day dexamethasone equivalents) by the time of first dose of treatment are allowed Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment, except for physiologic corticosteroid replacement therapy for adrenal or pituitary insufficiency which is permitted Has a known diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment. Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy > 10 mg/day or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of systemic immunosuppressive therapy within 7 days prior to the first dose of trial treatment; topical, inhaled, ocular, and intra-articular steroids are not exclusionary Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy in excess of physiologic dose or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Diagnosis of immunodeficiency or exposure to systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment (nasal or oral inhalers are permissible) Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment or, is taking any other medication that might affect immune function Immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment History of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment during the neoadjuvant pembrolizumab and optional adjuvant pembrolizumab stages Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment; inhaled and topical steroids are allowed Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment. Diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment; unless the steroid therapy is for physiological replacement Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment; with the exception of physiologic steroid replacement Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Diagnosis of immunodeficiency or exposure to systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment (nasal or oral inhalers are permissible) Subject has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving any systemic steroid therapy or any form of immunosuppressive therapy within 7 days prior to day 1 of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis now or in the past of immunodeficiency requiring systemic steroid therapy in excess of physiologic dose (or any other form of immunosuppressive therapy within 10 days prior to the first dose of trial treatment) Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment; inhaled or topical steroids are allowed Has a diagnosis of immunodeficiency or is receiving any systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to Day 1 of trial treatment. Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days before the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment For cohort 2, received > 30 days of prior treatment with CDK4/6 inhibitors or > 60 days of letrozole before screening diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of' immunosuppressive therapy within 7 days prior to the first dose of trial treatment. Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy > 2 mg of dexamethasone total per day or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment\r\n* Note: dexamethasone prior to treatment on day 1 of each treatment cycle is allowed Patient has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior the first dose of trial treatment Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial medication Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy by oral or IV routes within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment known diagnosis of immunodeficiency or is receiving systemic steroid therapy or other form of immunosuppressive therapy within 7 days of clinical trial treatment. Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving therapeutic systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy =< 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy (other than oral contraceptives) or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment Diagnosis of immunodeficiency or is receiving treatment with systemic steroid therapy or any other form of immunosuppressive therapy within seven days prior to registration for protocol therapy Has a diagnosis of immunodeficiency, is receiving systemic steroid therapy (except for physiological dose levels), or immunosuppressive therapies Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of AMG 757 SAFETY RUN-IN: Diagnosis of immunosuppression or receiving steroid therapy or other immunosuppressive therapy within 4 weeks of the study RANDOMIZED PHASE II CLINICAL TRIAL: Diagnosis of immunosuppression or receiving steroid therapy or other immunosuppressive therapy within 4 weeks of the study Diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment. Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study medication Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior the first dose of study therapy Any systemic steroid therapy or other form of immunosuppressive therapy within 7 days of the first dose of mRNA-4157 or pembrolizumab Is receiving systemic steroid therapy ?7 days prior to the first dose of study therapy or receiving any other form of immunosuppressive medication Any diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 14 days of initiation of therapy Patients who have a diagnosis of immunodeficiency or are receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to registration are not eligible Must not have a diagnosis of immunodeficiency, or receiving systemic steroid therapy, or any other form of immunosuppressive therapy within 7 days prior to trial treatment; short burst of steroids of 5-7 days (for chronic obstructive pulmonary disease [COPD] exacerbation or other similar indication) are allowed Diagnosis of immunodeficiency or is receiving systemic steroid therapy (other than oral contraceptives) or any other form of immunosuppressive therapy within 7 days prior to registration Diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to study registration. Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study medication Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the date of allocation/randomization Patient has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of pembrolizumab Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of HiDAC treatment; NOTE: use of steroid eye drops starting at the time of HiDAC administration is allowed Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drug. Has a known diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to study registration Systemic steroid therapy or any other form of immunosuppressive therapy within 14 days prior to registration Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 14 days prior to the first dose of the study drug Any diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 14 days of initiation of therapy Receiving systemic steroid therapy or any form of immunosuppressive therapy within 1 week prior to the start of study drug Any diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 14 days of initiation of therapy Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment. Has a diagnosis of immunodeficiency, or is receiving systemic steroid therapy above physiologic replacement dose, or any other form of immunosuppressive therapy Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to on-study date Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy =< 7 days prior to registration Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study medication Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment. Diagnosis of immunosuppression or receiving steroid therapy or other immunosuppressive therapy within 4 weeks of the study Diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drug Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment\r\n* Short-term administration of systemic steroids (i.e., for allergic reactions or the management of immune related adverse events [irAEs]) is allowed Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to registration Has a diagnosis of immunodeficiency or any other form of immunosuppressive therapy. Is receiving systemic steroid therapy within three days prior to the first dose of trial treatment or receiving any other form of immunosuppressive medication (corticosteroid use on study for management of early combined immunosuppression [ECIs] is allowed) Subjects who have a diagnosis of immunodeficiency or are receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the initiation of SBRT Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to study drug administration Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment; the use of physiologic doses of corticosteroids for adrenal and pituitary insufficiency is not considered a form of systemic steroid therapy and would not exclude a subject from the study Has a diagnosis of immunodeficiency or is receiving systemic immunosuppressive therapy within 7 days of study entrance Has a known history of immunosuppression or is receiving systemic steroid therapy or any other form of systemic immunosuppressive therapy within 7 days Subject has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to enrollment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy Patient has a diagnosis of immunodeficiency or is receiving ongoing immunosuppressive therapy, including systemic or enteric corticosteroids except for non-systemically absorbed treatments (such as inhaled or topical steroid therapy for asthma, chronic obstructive pulmonary disease, allergic rhinitis). Patient must be off systemic steroid or any other form of immunosuppressive therapy within 7 days prior to first dose of trial treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 2 weeks prior to randomization REGISTRATION TO TREATMENT (STEP 1): Patient must not have a diagnosis of immunodeficiency or be receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of treatment REGISTRATION TO TREATMENT (STEP 2): Patient must not have a diagnosis of immunodeficiency or be receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of treatment Has received systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to registration for protocol therapy Diagnosis of immunodeficiency or be receiving systemic steroid therapy or any other form of immunosuppressive therapy =< 7 days prior to registration Any diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 14 days of initiation of therapy Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 2 weeks of the first protocol treatment; the use of low-dose steroids for management of chronic conditions is allowed Has a diagnosis of immunodeficiency or is receiving systemic immunosuppressive steroid therapy or any other form of systemic immunosuppressive therapy within 7 days prior to the first dose of trial treatment; exception: physiologic corticosteroid replacement therapy for adrenal or pituitary insufficiency is not considered systemic immunosuppressive steroid therapy Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to randomization on this study Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drug. Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to treatment allocation Is receiving systemic steroid therapy <3 days before the first dose of study drug or receiving any other form of immunosuppressive medication. Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to randomization. Immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment Diagnosed with immunodeficiency or receiving systemic steroid therapy or another form of immunosuppressive therapy within 7 days Receiving TNF pathway inhibitors, PI3 kinase inhibitors, systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drug Has a diagnosis of immunodeficiency OR is receiving a systemic steroid therapy exceeding physiologic corticosteroid dose or any other form of immunosuppressive therapy within 7 days prior to randomization, except in the case of central nervous system (CNS) metastases. Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drug Receiving TNF pathway inhibitors, PI3 kinase inhibitors, systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drug Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drug Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the planned first dose of the study Receiving systemic steroid therapy <= 3 days prior to first dose of study drug or receiving any other form of immunosuppressive medication Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drug Receiving systemic steroid therapy within 3 days prior to the first dose of study treatment or receiving any other form of immunosuppressive medication Within 7 days prior to the planned start of study treatment:\r\n* Is receiving systemic steroid therapy or any other form of immunosuppressive therapy Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment, exceptions include topical, intralesional, intraarticular and inhaled steroids; a pulse steroid dose prior to and after imaging to prevent contrast allergy in patients with known allergy to contrast is allowed Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study medication Diagnosis of immunosuppression or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study medication Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study medication Systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study medication Diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to study registration. Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the radiation therapy Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study medication Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study therapy Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to randomization Subject is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 2 weeks prior to first dose of study treatment. Has a diagnosis of immunodeficiency or is receiving any form of immunosuppressive therapy within 7 days prior to the first dose of study treatment Systemic steroids, any other form of immunosuppressive therapy or radiation therapy within 14 days prior to registration. Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy. Diagnosis of immunodeficiency or receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to enrollment. Diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy (including immune modulators or systemic corticosteroids) within 7 days prior to study enrollment. Known diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment Known diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to day 1 Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study therapy Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study treatment Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to C11-AMT PET scan Diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy =< 7 days prior to registration Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to randomization. Has a diagnosis of immunosuppression or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drug.