Negative HIV test at screening Negative serum pregnancy test at screening A negative pregnancy test (if female) Negative serum pregnancy test Negative serum pregnancy test within days prior to starting treatment Female patients must have a negative pregnancy test A negative serum pregnancy test Have a negative result confirmed for a medically supervised urine (or serum) pregnancy test (with a sensitivity of at least mIU/mL) - days prior to the first dose of IP. A second pregnancy test performed within hours prior to the first dose of IP must also be confirmed to be negative prior to IP administration. Pregnancy or lactation at the time of randomization or intention to become pregnant during the study. (Note: Negative serum pregnancy test must be obtained within days prior to randomization). And have a negative serum pregnancy test at screening Negative serum pregnancy test In female, a negative pregnancy test if experiencing menstrual periods. Female subjects with reproductive potential must agree to undergo a medically supervised pregnancy test prior to starting study drug. The first pregnancy test will be performed at screening (within days prior to first study drug administration). A pregnancy test should also be performed on the day of the first study drug administration and confirmed negative prior to dosing as well as before dosing on Day of all subsequent cycles Negative serum pregnancy test at screening Pregnant or need to breast feed during the study period (negative serum pregnancy test required) have a negative serum pregnancy test at the time of enrollment, Negative serum pregnancy test. Has a negative serum pregnancy test within days prior to starting treatment. And have a negative serum pregnancy test ? days of cycle , day (CD) For WoCBP* negative serum pregnancy test within days of enrollment. In female, a negative pregnancy test if experiencing menstrual periods Negative serum pregnancy test PRIOR TO LYMPHODEPLETION: For WOCBP negative serum pregnancy test within hours prior to lymphodepletion have a negative serum pregnancy test at screening and before Betalutin injection A negative Hepatitis B test (HBsAg and anti-HBc) and negative HIV test during screening Women who are not postmenopausal or have not undergone hysterectomy must have a documented negative serum pregnancy test per standard MCC-VCUHS BMT Program guidelines Negative serum pregnancy test Negative serum pregnancy test Negative pregnancy test For females of childbearing age, they may participate it they: a. have a negative serum or urine pregnancy test within to days of enrolling (a second pregnancy test will be performed within hours (hrs) of starting therapy and both negative pregnancy tests will be required for starting therapy); b. agree to either abstinence or effective contraceptive methods throughout the treatment period and up to days after discontinuing treatment Negative pregnancy test at the time of SRS in any patient who could be pregnant Pregnancy or breastfeeding; female patients who are post-menarchal must have a documented negative pregnancy test Women of child-bearing potential must have a negative serum pregnancy test at screening; in addition to having a negative pregnancy test confirmed at screening, all female participants of childbearing potential must have a negative pregnancy test confirmed within hours prior to dosing with the study drug Negative pregnancy test, if applicable Negative pregnancy test WOCBP must have a negative pregnancy test within hours prior to Study Day . Female patients with an intact uterus (unless amenorrheic for the last months) must have a negative serum pregnancy test within hours prior to administration of any treatment Negative pregnancy test A negative pregnancy test (if female). Have negative pregnancy tests as verified by the Investigator prior to starting any IP therapy: serum pregnancy test at screening and negative serum or urine pregnancy test (Investigator's discretion) within hours prior to starting treatment with IP (Cycle , Day ). They must agree to ongoing pregnancy testing during the course of the study (before beginning each subsequent cycle of treatment), and after the last dose of any IP. This applies even if the subject practices complete abstinence[] from heterosexual contact. Agree to have a medically supervised serum pregnancy test with sensitivity of at least mIU/mL obtained at Screening. A serum pregnancy test is to be performed within hours prior to Day of starting study therapy on Cycle Day -, and within hours prior to Day of every subsequent cycle, and at the Treatment Discontinuation Visit. The subject may not receive IP until the Investigator has verified that the result of the pregnancy test is negative. Negative serum pregnancy test at screening (sensitivity of at least mIU/mL); (Note that the screening serum pregnancy test can be used as the test prior to starting IP in the pharmacokinetics phase if it is performed within the -hour timeframe), and Negative serum pregnancy test WOCBP must have a negative serum pregnancy test within days prior to the first dose of ipilimumab/nivolumab Documentation of negative pregnancy test. Must have a negative serum pregnancy test Negative pregnancy test at screening Negative serum pregnancy test; if, on cycle day , greater than hours has elapsed since the last negative result, a serum pregnancy test must be repeated and be negative on cycle day (CD) for the patient to remain eligible Negative serum pregnancy test at screening. FCBP must have negative pregnancy tests (sensitivity of at least mIU/mL) prior to initiating lenalidomide; the first pregnancy test must be performed within - days before day cycle and the second pregnancy test must be performed within hours of day cycle ; the subject may not receive lenalidomide until the treating investigator has verified that the results of these pregnancy tests are negative, and must agree to ongoing pregnancy tests; for patients already on Revlimid, continuation of current testing schedule is permitted as long as it is not interrupted during the transition to CRd therapy Negative pregnancy test for WOCBP Patients of childbearing age must have a negative pregnancy test A FCBP must have two negative pregnancy tests (sensitivity of at least mIU/mL) prior to starting study drug; the first pregnancy test must be performed within - days prior to the start of study drug and the second pregnancy test must be performed within hours prior to prescribing the study drug; the subject may not receive study drug until the investigator has verified that the results of these pregnancy tests are negative Negative pregnancy test. Negative pregnancy test if applicable And have a negative blood pregnancy test at the time of screening And have a negative serum pregnancy test at screening Negative serum test for pregnancy in premenopausal women Negative serum pregnancy test. Women must have a negative serum pregnancy test WOCBP must have a negative serum pregnancy test within days prior to receiving investigational product and a negative urine pregnancy test on Day of each Cycle; A negative serum pregnancy test (if female) Negative pregnancy test Negative pregnancy test Negative pregnancy test Negative pregnancy test Negative pregnancy test negative serum pregnancy test Negative pregnancy test Must have a negative serum pregnancy test at screening and day -, and Pregnancy or breastfeeding - menstruating females must have a negative pregnancy test prior to study enrollment and agree to repeat pregnancy testing and contraception use per protocol Negative pregnancy test at study registration Negative pregnancy test Negative pregnancy test They are not pregnant (i.e., female patients must have a negative serum pregnancy test at screening); Pregnancy, confirmed by a negative pregnancy test within days of study enrollment All WOCBP MUST have a negative pregnancy test prior to first receiving study medication Negative pregnancy test =< days prior to randomization Have two negative pregnancy tests as verified by the investigator prior to starting any IP therapy: serum pregnancy test at screening and negative serum or urine pregnancy test (investigator's discretion) within hours prior to starting treatment with IP (Cycle , Day ). They must agree to ongoing pregnancy testing during the course of the study (before beginning each subsequent cycle of treatment), and after the last dose of any IP. This applies even if the subject practices complete abstinence from heterosexual contact. has a negative pregnancy test on the day of vaccination, and has a negative pregnancy test on the day of vaccination, and Pregnancy or nursing patients will be excluded from the study; a pregnancy test will be done prior to the MR examination for postmenarchal teenage girls, in whom pregnancy may be possible; only patients with a negative pregnancy test will be included in the study Pregnancy or nursing patients will be excluded from the study; a pregnancy test will be done prior to the MR examination for postmenarchal teenage girls, in whom pregnancy may be possible; only patients with a negative pregnancy test will be included in the study Determination of pregnancy status: Female patients who are not postmenopausal or surgically sterile will undergo a serum pregnancy test prior to each set of [F]FLT and [F] Fluciclovine PET scans; a negative test will be necessary for such patients to undergo research PET imaging In female patients, negative pregnancy test with no plans to become pregnant during the duration of the study Determination of pregnancy status: female patients that are not postmenopausal or surgically sterile will undergo a serum pregnancy test prior to each set of multi-tracer PET scans; a negative test will be necessary for such patients to undergo research PET imaging Negative serum pregnancy test Female patients who are not postmenopausal or surgically sterile will undergo a serum pregnancy test prior to baseline and the subsequent set of multi-tracer PET scans; the serum pregnancy test must be performed within hours prior to research PET imaging; a negative test will be necessary for such patients to undergo research PET imaging Determination of pregnancy status: female patients who are not postmenopausal or surgically sterile will undergo a serum pregnancy test prior to baseline and the subsequent set of multi-tracer PET scans; the serum pregnancy test must be performed within hours prior to research PET imaging; a negative test will be necessary for such patients to undergo research PET imaging