Background: Mature T-cell malignancies (TCMs) are a rare group of cancers that usually do not have effective treatments or cures. Because of this, participants with TCMs often relapse and have a poor overall prognosis. This trial is testing if combining several drugs against TCMs can be a more effective. Primary Objective: To test if the combination of romidepsin, CC-486 (5-azacitidine), dexamethasone, and lenalidomide (RAdR) can be given safely to participants with relapsed or treatment refractory TCM. Other (Secondary) Objective: Measure the activity of this combination treatment. Eligibility: People age 18 and older who have a failed or relapsed after standard treatments for mature TCMs. Design: Participants will be screened for eligibility by performing the following tests or procedures: Physical exam Medical history Medicine review Blood and urine tests Symptom review Bone marrow examination Total Body imaging scans or x-rays Tumor biopsy Participants will have blood tests during treatment to make sure their blood cell counts are okay. Romidepsin is infused through an intravenous (IV) placed in one of the veins usually in the arm. Lenalidomide, dexamethasone, and CC-486 (5-azacitidine) are pills or capsules taken by mouth. Participants are asked to keep a diary of when they take their pills to make sure they are taking these medicines properly. Participants will have tumor imaging scans after every 2nd cycle (or 6 weeks) to check if the treatment is working. If the doctors are concerned the cancer has spread to the brain and/or spine, they will have scans of the area(s) and a sampling of the fluid around the brain/spine which is obtained through a small needle inserted into the lower part of the back for a short time to collect the fluid. This procedure is called a spinal tap or lumbar puncture. Participants who have tumor in their skin will have repeat exams of their skin and sometimes photographs taken of these areas to see if the treatment is working. Participants will also be asked to give blood, saliva, and sometimes have optional biopsies of their tumor where these tests are done for research purposes. After they have completed the protocol treatment (6 cycles), they will be asked to return to clinic 30 days after treatment has ended, then every other month (or 60 days) for the first 6 months, then every 3 months (90 days) for 2 years, and then every 6 months for years 2 to 4 after completing treatment. After 4.5 years, they will be seen once a year.
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Maximum Tolerated Dose (MTD)
Timeframe: 21 days
Rate and Severity of Serious and/or Non-serious Adverse Events (AE's) by Grade and Type of Toxicity
Timeframe: 6 cycles (each cycle is 28 days)
Number of Treatment Emergent Grades 3, 4 and/or 5 Adverse Events Possibly Related to Drug Grouped by Severity
Timeframe: 6 cycles (each cycle is 28 days)
Arm 1, Cohort 1, Dose Level -1, 1, and 2 Treatment Emergent Serious Grades 3, 4, and/or 5 Adverse Events Possibly Related to Drug Grouped by Relationship to the Study Drug and/or Combination
Timeframe: 6 cycles (each cycle is 28 days)
Arm 1, Cohort 1, Dose Level 3, and Arm 1, Cohort 1, Dose Level 4 Treatment Emergent Serious Grades 3, 4, and/or 5 Adverse Events Possibly Related to Drug Grouped by Relationship to the Study Drug and/or Combination
Timeframe: 6 cycles (each cycle is 28 days)
Arm 2, Cohort 2, Dose Level 2 and 4; and Arm 3, Cohort 2, Dose Level 4 Treatment Emergent Serious Grades 3, 4, and/or 5 Adverse Events Possibly Related to Drug Grouped by Relationship to the Study Drug and/or Combination
Timeframe: 6 cycles (each cycle is 28 days)