Not pregnant and not nursing; therefore, for women of childbearing potential only, a negative (if your test schedule specifically indicates a urine or serum pregnancy test, add that information at this point) pregnancy test done =< 28 days prior to registration is required Female patients must have a negative pregnancy test (blood or urine) within 14 days prior to registration WOCBP must have a negative pregnancy test (serum or urine). Negative serum or urine pregnancy test within 7 days prior to starting treatment Negative urine pregnancy test done =< 7 days prior to registration, for women of childbearing potential only\r\n* NOTE: If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Females at reproductive age must have a negative urine pregnancy test prior to entry to this study Female patients must have a negative urine pregnancy test within 7 days prior to registration; if urine test is positive, it should be followed by serum pregnancy test FCBP must have a negative serum or urine pregnancy test and agree to birth control. If female, the subject must have a negative serum or urine pregnancy test at Screening unless meeting non-productive potential criteria. Either of non-reproductive potential (i.e., post-menopausal by history of age >= 50 years old and no menses for >= 1 year without an alternative medical cause; OR history of hysterectomy, history of bilateral tubal ligation, or history of bilateral oophorectomy) OR must have a negative urine or serum pregnancy within 72 hours prior to receiving the first dose of study treatment; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required; subjects with a negative pregnancy test at screening beyond 72 hours prior to treatment, but who otherwise meet all other criteria, may be registered to trial but must have a repeat negative serum pregnancy test within 72 hours of treatment and such testing may be done on day of first treatment prior to administration Women of childbearing potential (WOCBP): negative urine or serum pregnancy test; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Women of childbearing potential (WOCP) must not be pregnant or breast-feeding. A negative serum or urine pregnancy test is required within 72 hours of study registration. If the urine test cannot be confirmed as negative, a serum pregnancy test will be required. FOCBP must have a negative serum or urine pregnancy test within 14 days prior to registration on study Pregnancy (assessed by urine HCG) Female subject of childbearing potential should have a negative urine or serum pregnancy test within 28 days of study registration; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Pregnancy (positive serum or urine ?HCG test) or breast-feeding Female of childbearing potential: negative urine or serum pregnancy test, performed within 14 days prior to day 1 of protocol therapy\r\n* If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Negative urine or serum pregnancy test done =< 72 hours prior to first treatment, for women of childbearing potential only\r\n* If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Female patients of childbearing potential should have a negative pregnancy test within 10 days prior to on-study date; if a urine or serum test is positive or cannot be confirmed as negative, the other (urine or serum pregnancy test, whichever was not performed first) will be required Females of childbearing potential must have a negative pregnancy test within 10 days prior to “on study” status; if a urine or serum test is positive or cannot be confirmed as negative, the other (urine or serum pregnancy test, whichever was not performed first) will be required DONOR: A serum or urine pregnancy test for females of reproductive potential must be conducted within 7 days prior to initiation of apheresis Negative pregnancy test done =< 7 days prior to registration, for persons of childbearing potential only (POCBP)\r\n* NOTE: Serum or urine pregnancy test allowed; if urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Female patients of childbearing potential must have a negative pregnancy test (either urine or serum pregnancy test) within 72 hours prior to the first dose of study treatment. If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required. FOCBP must have a negative serum OR urine pregnancy test =< 7 days prior to registration Female patient of childbearing potential has a negative urine or serum pregnancy test; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required; the serum pregnancy test must be negative for the patient to be eligible FOCBP must have a negative pregnancy test (either urine or serum) within 14 days prior to registration To be performed within 10 business days prior to day 1: Female of childbearing potential: negative urine or serum pregnancy test; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Within 14 days prior to planned start of treatment: Female of childbearing potential: negative urine or serum pregnancy test\r\n* If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required A negative urine dipstick pregnancy test Female subject of childbearing potential has a negative urine or serum pregnancy test; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required; the serum pregnancy test must be negative for the subject to be eligible Female subject of childbearing potential should have a negative urine or serum pregnancy test within 10 days of initiating SBRT; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Negative urine or serum pregnancy test (female of childbearing potential only)\r\n* If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required FOCBP must have a negative urine or serum pregnancy test within 7 days prior to receiving the first dose of study medication; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Positive pregnant status confirmed by serum or urine pregnancy test FOCBP must have a negative pregnancy test (serum or urine) within 7 days prior to registration on study DONOR: Not pregnant as confirmed by negative serum or urine pregnancy test within 14 days prior to enrollment (if female) Patients of childbearing potential must have a negative urine or serum pregnancy test =< 7 days prior to registration\r\n* NOTE: If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Female subject of childbearing potential should have a negative urine or serum pregnancy within 28 days prior to study registration up to the first fraction of radiation; \r\n* Note: if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Female patient of childbearing potential (WOCBP) (free from menses for > 2 years, post hysterectomy/oophorectomy, or surgically sterilized) must have a negative urine or serum pregnancy test; if the urine test is positive or cannot be confirmed as negative a serum pregnancy test will be required to be shown as negative for the patient to be eligible DONOR: Female subjects must have a negative urine or serum pregnancy test within 10 days prior to taking study medication if of childbearing potential or must be of non-childbearing potential; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required; the serum pregnancy test must be negative for the subject to be eligible; non-childbearing potential is defined as:\r\n* >= 45 years of age and has not had menses for > 2 years\r\n* Amenorrheic for > 2 years without a hysterectomy and oophorectomy and a follicle-stimulating hormone (FSH) value in the postmenopausal range upon pretrial (screening) evaluation\r\n* Post-hysterectomy, oophorectomy, or tubal ligation Female subjects must have a negative urine or serum pregnancy test if of childbearing potential or be of non-childbearing potential; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required; the serum pregnancy test must be negative for the subject to be eligible; non-childbearing potential is defined as:\r\n* >= 45 years of age and has not had menses for > 2 years\r\n* Amenorrheic for > 2 years without a hysterectomy and oophorectomy and a FSH value in the postmenopausal range upon pretrial (screening) evaluation\r\n* Post-hysterectomy, oophorectomy, or tubal ligation Pregnancy (assessed by urine HCG) Female patients who are at least 10-years-old or are post-menarchal must have a negative serum or urine pregnancy test prior to enrollment Negative urine pregnancy test and/or serum pregnancy test within 7 days of initiation of therapy Negative serum or urine pregnancy test Female patients with reproductive potential who do not have a negative blood or urine pregnancy test at screening DONOR: Not pregnant as confirmed by negative serum or urine pregnancy test within 14 days prior to enrollment (if female) Negative pregnancy test (serum or urine) in premenopausal women Patients must have a documented negative pregnancy test (urine or serum) for women who have menstruation in the past 12 months and without sterilization surgery Negative pregnancy test done =< 7 days prior to registration, for persons of childbearing potential only\r\n* NOTE: If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Female subject of childbearing potential should have a negative urine or serum pregnancy within 7 days of enrollment; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Have a negative urine pregnancy test at baseline. Negative blood or urine pregnancy test at screening For childbearing female patients, negative serum or urine pregnancy test at screening A negative serum or urine pregnancy test during Screening, ORAL CAVITY SQUAMOUS CELL CARCINOMA COHORT: Negative urine/serum pregnancy test (females only) at the time of screening and within 24 hours of study treatment, if applicable Women of childbearing potential (WOCBP): negative urine or serum pregnancy test\r\n* If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Female patient of childbearing potential has a negative urine or serum pregnancy test; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required; the serum pregnancy test must be negative for the patient to be eligible Within 14 days prior to day 1 of protocol therapy unless otherwise stated: Women of childbearing potential (WOCBP): negative urine or serum pregnancy test; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Female participants of childbearing potential must have a negative serum pregnancy test at screening and negative (serum or urine) pregnancy test within 72 hours before the first study-drug dose; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required; the serum pregnancy test must be negative for the participant to be eligible To be performed within 28 days prior to day 1 of protocol therapy: Female of childbearing potential: negative urine or serum pregnancy test\r\n* If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Female patients with reproductive potential who do not have a negative blood or urine pregnancy test at Screening or who are lactating. A WOCBP who has a positive urine pregnancy test within 72 hours prior to study treatment start; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Woman of childbearing potential (WOCBP): negative urine or serum pregnancy test; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Negative pregnancy test done =< 7 days prior to registration, for persons of childbearing potential only\r\n* NOTE: If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required\r\n* NOTE: Merck requires an additional pregnancy test if eligibility pregnancy test is > 72 hours prior to first dose Female subject of childbearing potential should have a negative urine or serum pregnancy per institutional guidelines for high-dose melphalan and autologous transplant; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Females only:\r\n* Urine or serum pregnancy test negative assessed within seven (7) days prior to the start of therapy And have a negative urine pregnancy test at Screening Have a negative urine or serum pregnancy test at screening Female patients with reproductive potential who do not have a negative blood or urine pregnancy test at Screening. Negative urine/serum pregnancy test, if applicable Negative serum or urine pregnancy test within 3 days prior to start of study treatment. Negative urine pregnancy test Pregnant or breastfeeding women; female study participants of reproductive potential must have a negative urine pregnancy test of enrollment; a serum pregnancy test will be performed within 2 weeks before infusion Female of childbearing potential only: negative urine or serum pregnancy test; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required (within 14 days prior to day 1 of protocol therapy) And have a negative urine or serum pregnancy test at screening Female subjects of childbearing potential must have a negative serum pregnancy test within 7 days prior to study entry (positive urine tests are to be confirmed by serum test) Negative urine or serum pregnancy test done =< 7 days prior to registration for females who are post-menarchal Female patients must be surgically sterile, post-menopausal (for at least 1 year), or have negative results from a pregnancy test performed as follows:\r\n* At screening, on a serum sample obtained within 14 days prior to the first study drug administration, and\r\n* Prior to dosing, on a urine sample obtained on day 1 of treatment if it has been > 7 days since obtaining the serum pregnancy test result Women of childbearing potential (WOCP) must not be pregnant or breast-feeding. A negative serum or urine pregnancy test is required within 72 hours of study registration. If the urine test cannot be confirmed as negative, a serum pregnancy test will be required. Female subjects of childbearing potential should have a negative urine or serum pregnancy test; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required must have a negative urine pregnancy test at Screening, and Female patient of childbearing potential has a negative urine or serum pregnancy test; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required; the serum pregnancy test must be negative for the patient to be eligible Female participant who is post-menarchal must have a negative urine or serum pregnancy test Positive serum or urine pregnancy test Patients who are pregnant; pregnancy will be confirmed by negative urine test Known pregnancy (negative serum or urine pregnancy test to be conducted within 7 days prior to enrollment) (Female only) DONOR: Known pregnancy (negative serum or urine pregnancy test to be conducted within 7 days prior to enrollment) (Female only) Female patients must have a negative urine or serum pregnancy test at screening (pregnancy test not required for patients with bilateral oophorectomy and/or hysterectomy or for those patients who are > 1 year postmenopausal) The patient is pregnant (confirmed by urine or serum pregnancy test) or lactating Female patients of childbearing potential (not postmenopausal for at least 12 months and not surgically sterile) must have a negative serum or urine pregnancy test within 14 days of study registration; pregnancy test must be repeated if performed > 14 days before starting study drug INCLUSION CRITERIA - HPC-A CELL DONOR: Not pregnant as confirmed by negative serum or urine pregnancy test within 7 days prior to enrollment (if female) (Female only) negative serum or urine pregnancy test (to be conducted within 7 days prior to enrollment) (Female only) is not pregnant (negative serum or urine pregnancy test to be conducted within 7 days prior to admission for transplant) DONOR: (Female only) is not pregnant (negative serum or urine pregnancy test to be conducted within 7 days prior to enrollment) DONOR: Not pregnant as confirmed by negative serum or urine pregnancy test within 14 days prior to enrollment (if female) Patient is pregnant as confirmed by positive serum or urine pregnancy test within 14 days prior to enrollment Not pregnant as confirmed by negative serum or urine pregnancy test within 14 days prior to enrollment (if female) Negative serum or urine pregnancy test within 7 days prior to and including the morning of day -7 (first potential day of research blood draw and tumor biopsy) Negative serum or urine pregnancy test at the time of first dose for WOCBP. DONOR: Not pregnant as confirmed by negative serum or urine pregnancy test within 14 days prior to enrollment (if female) Negative urine pregnancy test (negative serum confirmatory pregnancy test if urine test is positive) Pregnant or nursing women; a negative pregnancy test (serum or urine) =< 3 days prior to starting study treatment Female subjects of childbearing potential must have either a negative urine or a negative serum pregnancy test within seven (7) days of first dose of pembrolizumab; if a urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required Female subjects of childbearing potential, must have either a negative urine or a negative serum pregnancy test within seven (7) days of first dose of pembrolizumab; if a urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required FOCBP must have a negative urine or serum pregnancy test within 14 days prior to registration on study. Pregnancy: All female patients < 55 years old (yo) will be administered a urine pregnancy test prior to enrollment Patients who are pregnant; the absence of pregnancy will be confirmed by negative urine test Minocycline trial only: patients who are pregnant; pregnancy will be confirmed by negative urine test; patients with a positive urine test will be retested for doubling of human chorionic gonadotropin (HCG) 48 hours after the first test; patients without such a rise will be eligible for the study and will be enrolled at the investigator’s discretion (Female only) Known pregnancy (negative serum or urine pregnancy test to be conducted within 14 days prior to enrollment) Satisfactory results of screening safety labs, urine pregnancy test and drug test Pregnancy (assessed by urine HCG) Negative pregnancy test (urine and blood tests) Pregnancy (urine hCG) A negative serum pregnancy test at Screening followed by a negative urine pregnancy test on the day of surgery or day of admission for female patients of childbearing potential Female subjects of childbearing potential should have a negative urine or serum pregnancy within 14 days prior to C11-AMT PET scan; if the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required And have a negative urine or serum pregnancy test at screening Female patients must have a negative urine pregnancy test A negative serum pregnancy test at Screening followed by a negative urine pregnancy test on the day of surgery or day of admission for female patients of childbearing potential Female subjects with reproductive potential must have negative serum or urine pregnancy test