Background: Stem cell or bone marrow transplants can cure or control blood cancers. Sometimes the donor cells see the recipient's body as foreign. This can cause complications. A high dose of the drug cyclophosphamide (PTCy) can help reduce these risks. Researchers want to see if a lower dose of PTCy can have the same benefits. Based on encouraging results from the first part of the study, researchers now are investigating whether a lower dose of PTCy can allow other immunosuppression to be decreased. Objective: To see if a lower dose of PTCy and now also shorter duration of another immunosuppressant called mycophenolate mofetil will help people with blood cancers have a more successful transplant and fewer side effects. Eligibility: People ages 15-65 with leukemia, lymphoma, or multiple myeloma that is not curable with standard therapy and is at high risk of returning without transplant, and their healthy adult relatives Design: Transplant participants will be screened with: Blood, urine, breathing, and heart tests Scans Chest x-ray Bone marrow samples: A needle inserted into the participant s pelvis will remove marrow and a bone fragment. Transplant recipients will stay at the hospital and be prepped with chemotherapy over 6 days for the transplant. They will get stem cells through a catheter in the chest or neck. They will get the cyclophosphamide chemotherapy. They will stay in the hospital about 4 more weeks. They will have blood transfusions. They will have frequent blood tests and 2 bone marrow samples within 1 year after the transplant. Donor participants will be screened with: Blood, urine, and heart tests Chest x-ray Scans Donor participants will have bone marrow taken from their pelvis or stem cells taken from their blood. For the blood donation, blood will be taken from a vein in one arm, move through a machine to remove white blood cells, and be returned through a vein in the other arm. Participation will last up to 5 years....
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aGVHD protection from a reduced duration of MMF, in combination with PTCy 25 mg/kg/day
Timeframe: 60 days
aGVHD protection from PTCy 25 mg/kg
Timeframe: 60 days