Major surgery within 28 days of starting study treatment and patients must have recovered from any effects of any major surgery Patients must have fully recovered from any adverse effects of major surgery (to =< grade 1) at least 14 days prior to registration Major surgery within 2 weeks prior to randomization: patients must have recovered from any effects of any major surgery Major surgery must not have occurred within 2 weeks prior to enrollment and patients must have recovered from any effects of any major surgery Patient has had major surgery within 14 days prior to treatment start or has not recovered from major side effects (tumor biopsy is not considered as major surgery) Major surgery within 14 days of starting study treatment and patients must have recovered from any effects of any major surgery Major surgery within 2 weeks of starting study treatment and patients must have recovered from any effects of any major surgery Major surgery =< 14 days prior to registration or has not recovered from major side effects (tumor biopsy is not considered as major surgery) ?4 weeks since any major surgery and fully recovered. Participants who have had major surgery within 2 weeks prior to starting study drug or has not recovered from major side effects (tumor biopsy is not considered as major surgery) Major surgery within 3 weeks prior to first dose of study treatment, and patients must have recovered from the effects of surgery Patient has had major surgery within 14 days prior to starting study drug or has not recovered from major side effects (tumor biopsy is not considered as major surgery) Major surgery within 14 days prior to starting study drug or has not recovered from major side effects (tumor biopsy is not considered as major surgery) Subjects must have recovered from major side effects of prior therapies or procedures. Participants who have undergone major surgery within 14 days of starting the study treatment, or participants who have not recovered to baseline status from the effects of major surgery received more than 14 days prior. Has not fully recovered from any effects of major surgery without significant detectable infection. Major surgery within 3 weeks of starting the study or patient has not recovered from any effects of any major surgery Prior major surgery within 12 weeks or prior major surgery from which the patient has not sufficiently recovered yet PHASE II EXCLUSION CRITERIA: Prior major surgery within 12 weeks or prior major surgery from which the patient has not sufficiently recovered yet Major surgery within 2 weeks of starting the study treatment, or not recovered to baseline status from the effects of surgery received > 2 weeks prior Patient has had major surgery within 14 days prior to starting study drug or has not recovered from major side effects (tumor biopsy is not considered as major surgery) Patient has had major surgery within 14 days prior to starting study drug or has not recovered from major side effects (tumor biopsy is not considered as major surgery) Participants who have undergone major surgery within 14 days of starting the study treatment, or participants who have not recovered to baseline status from the effects of major surgery received more than 14 days prior Major thoracic or abdominal surgery from which the patient has not sufficiently recovered yet Have had major surgery other than a minor outpatient procedure within 4 weeks prior to dose assignment or have not recovered from major side effects of the surgery if more than 4 weeks have elapsed since surgery Fully recovered from any effects of major surgery, and be free of significant infection Patients who have had major surgery must be fully recovered and >= 4 weeks post-operative prior to enrolling on study Patients that have had major surgery within 2 weeks of starting study treatment and patients must have recovered from any effects of any major surgery Patient has had major surgery within 14 days prior to starting study drug or has not recovered from major side effects (tumor biopsy is not considered as major surgery) Major surgery within 2 weeks of starting study treatment and subjects must have recovered from any effects of any major surgery. Major surgery within 28 days prior to starting study drug or has not recovered from major side effects of the surgery. Major surgery =< 14 days prior to starting study treatment or who have not recovered from side effects to < grade 2 CTCAE Recent major surgery within 4 weeks prior to starting study treatment. Minor surgery within 2 weeks of starting study treatment. Patients must be recovered from effects of surgery Subject has had major surgery within 14 days prior to registration or has not recovered from major side effects of the surgery (tumor biopsy is not considered as major surgery). Patient has had major surgery (e.g., intra­thoracic, intra­abdominal or intra­pelvic) within 4 weeks prior to starting study treatment or has not recovered from side effects of such procedure; video­-assisted thoracic surgery (VATS) and mediastinoscopy will not be counted as major surgery and patients can receive study treatment >= 1 week after these procedures Patient has had major surgery within 14 days prior to starting study drug or has not recovered from major side effects (tumor biopsy is not considered as major surgery) Major surgery within 2 weeks of starting study treatment and patients must have recovered from any effects of any major surgery Subject who has not recovered from the effects of any major surgery prior to initial treatment Surgery: at least 2 weeks since undergoing any major surgery and must be recovered from effects of surgery Major surgery within 14 days of registration and patients must have recovered from any effects of any major surgery Major surgery within 14 days prior to starting study drug or has not recovered from surgical complications (tumor biopsy is not considered as major surgery) Had major surgery within 14 days prior to starting study drug or has not recovered from major side effects (tumor biopsy is not considered major surgery) resulting from a prior surgery Patients who have had major surgery must be fully recovered and require a recovery period of >= 4 weeks prior to enrolling on study Has had any major surgery within 14 days prior to starting study drug or has not recovered from major side effects (tumor biopsy is not considered major surgery) resulting from a prior surgery Any major surgery (within 4 weeks of Study Day 1, or has not recovered from the effects of such surgery). Major thoracic or abdominal surgery from which the patient has not sufficiently recovered yet Patient has had major surgery within 14 days prior to starting study drug or has not recovered from major side effects (all surgical wounds must be fully healed); for the purpose of this criterion, a major surgical procedure is defined as one requiring the administration of general anesthesia (tumor biopsy is not considered as major surgery) The patient is not recovered from minor or major surgery and is less than 4 weeks from major surgery prior to starting treatment with pembrolizumab Major surgery =< 14 days prior to registration or have not recovered from side effects of such therapy Major surgery, or not recovered from major surgery within 4 weeks before the first dose of study treatment Major surgery <=4 weeks before the first dose of study treatment. Subjects must have also fully recovered from any surgery (major or minor) and/or its complications before initiating study treatment. Have had major surgery ? 2 weeks prior to starting treatment with Andes-1537 or who have not recovered from side effects of such surgery Major surgery within 2 weeks of starting study treatment and patients must have recovered from any effects of any major surgery. Major surgery within 2 weeks of starting study treatment and patients must have recovered from any effects of any major surgery Major surgery or radiation ? 2 weeks prior to starting study treatment or who have not recovered from side effects of surgery or radiation At least 4 weeks have elapsed since the completion of major surgery, and the patient has fully recovered from this surgery and any post-surgical complications Major surgery within 2 weeks of starting study treatment and patients must have recovered from any effects of any major surgery. Patient who has undergone major surgery =< 4 weeks prior to starting study treatment or who has not recovered from side effects of such procedure; note: core needle biopsy, diagnostic tonsillectomy or excisional lymph node biopsy do not constitute major surgery Patients must be at least 4 weeks (28 days) from major surgery and fully recovered from all acute effects of prior surgical intervention Major thoracic or abdominal surgery from which the patient has not yet recovered. Patients who have had major surgery or trauma within 28 days prior to entering the study; patients must have recovered from any effects of any major surgery and surgical wound should have healed prior to starting treatment Major surgery =< 4 weeks prior to registration or have not recovered from side effects of such therapy Major surgery within 14 days of starting study treatment and patients must have recovered from any effects of any major surgery Patient has had major surgery within 14 days prior to starting study drug or has not recovered from major side effects Patient has had major surgery within 14 days prior to starting study drug or has not recovered from major side effects (tumor biopsy is not considered as major surgery) Major surgery within 2 weeks of first dose of study drug; patients must have recovered from the effects of any surgery performed greater than 2 weeks previously Patient has had major surgery within 14 days prior to starting study drug or has not recovered from major side effects (tumor biopsy is not considered as major surgery) Major surgery within 2 weeks of first dose of study drug; patients must have recovered from the effects of any surgery performed greater than 2 weeks prior Subject has had major surgery within 14 days prior to starting study drug or has not recovered from major side effects Major surgery within 2 weeks of starting study treatment and patients must have recovered from any effects of any major surgery Patients may have received prior surgery; for all major surgeries, at least 14 days must have elapsed since completion and patient must have recovered from all major side effects of surgery per investigator’s assessment PRIOR/CONCURRENT THERAPY CRITERIA: Patients must not have had a major surgery within 28 days prior to registration; patients must have recovered from any adverse effects of prior surgery to the satisfaction of the treating physician; biopsies and central IV access placement are not considered major surgery Subject has had major surgery within 14 days prior to starting study drug or has not recovered from major side effects Major surgery within 2 weeks prior to registration; patients must have recovered from any effects of any major surgery Patient has had major surgery =< 14 days prior to registration or has not recovered from major side effects (tumor biopsy is not considered as major surgery) Are at least 4 weeks from major surgery and recovered. Major surgery ? 2 weeks prior to starting study drug or still recovering from post operative side effects. Patients must be at least 4 weeks from major surgery and must be fully recovered Patient has had major surgery within 14 days prior to starting study drug or has not recovered from major side effects (tumor biopsy is not considered a major surgery) Major surgery ? 2 weeks and recovered from any clinically significant effects of recent surgery. Patient has had major surgery within 14 days prior to starting study drug or has not recovered from major side effects (tumor biopsy is not considered as major surgery). Major surgery within 2 weeks of first dose of study drug; patients must have recovered from the effects of any surgery performed greater than 2 weeks previously Patient has had major surgery within 14 days prior to starting study drug or has not recovered from major side effects (tumor biopsy is not considered as major surgery) Major surgery =< 4 weeks prior to starting study regimen or who have not recovered from surgery Patient underwent major systemic surgery =< 2 weeks prior to starting the trial treatment or who has not recovered from the side effects of such surgery Surgery: at least 2 weeks since undergoing any major surgery and must be recovered from effects of surgery Major thoracic or abdominal surgery from which the patient has not yet recovered. Major surgery within 2 weeks of starting study treatment and patients must have recovered from any effects of any major surgery. Major surgery within 2 weeks of study treatment initiation and patients must have recovered from any effects of any major surgery. Patients who have not recovered from the side effects of any major surgery Major surgery =< 4 weeks prior to registration or have not recovered from side effects of such therapy Major surgery within 2 weeks of starting study treatment, and subjects must have recovered from any effects of any major surgery; Patients who have had major surgery must be fully recovered and >= 4 weeks post-operative prior to enrolling on study Major surgery within 6 weeks prior to Baseline. The subject must have recovered from surgery and be without current complications of infection or dehiscence. Patient had major surgery within 28 days prior to starting study drug or has not recovered from major side effects of the surgery Major surgery within 2 weeks of first dose of study drug. Patients must have recovered from the effects of any surgery performed greater than 2 weeks previously. At least 4 weeks have elapsed since the completion of major surgery, and the patient has fully recovered from this surgery and any post-surgical complications. Patient has had major surgery within 14 days prior to starting study drug or has not recovered from major side effects. Major surgery ? 2 weeks or radiotherapy ? 4 weeks prior to planned start of study drug or patient has not recovered from major side effects. Patients must be at least 4 weeks from major surgery and have fully recovered from any effects of surgery, and be free of significant detectable infection prior to registration Major surgery within 14 days prior to starting Investigational Product or has not recovered from major side effects. Prior major surgery from which the subject has not yet recovered to baseline; Patients must have fully recovered from any effects of major surgery, and be free of significant detectable infection Major surgery within 3 weeks of starting the study or patient has not recovered from any effects of any major surgery Major surgery within 3 weeks of starting the study or patient has not recovered from any effects of any major surgery Patients must be at least 4 weeks from major surgery and have fully recovered from any effects of surgery, and be free of significant detectable infection If a patient has had major surgery, the patient must be longer than four weeks post surgery and must have recovered from all toxicity prior to beginning protocol study Patient has had major surgery within 14 days prior to starting study drug or has not recovered from major side effects Has not recovered from major surgery prior to starting study therapy >= 4 weeks since last major surgery and fully recovered Recovered from major surgery within the last 6 months Major surgery within 1 month of starting study program and patients must have recovered from any effects of major surgery The patient must be recovered from a prior major surgery; the major surgery must be performed at least 4 weeks prior to consent date Patient underwent major systemic surgery =< 2 weeks prior to starting the trial treatment or who has not recovered from the side effects of such surgery, or who plan to have surgery within 2 weeks of the first dose of the study drug Major surgery within two weeks of study registration of which the patient has not recovered Participants with acute intercurrent illness or those who had major surgery within the preceding 4 weeks unless they have fully recovered Major surgery within 14 days of starting study treatment and patients must have recovered from any effects of any major surgery