This study is for patients with acute leukemia or myelodysplastic syndrome (MDS). This study is being done to help understand whether a haplo related donor or a MUD HCT for people with acute leukemia or MDS is better or if there is no difference at all.

This study is for patients that have had hematopoietic stem cell transplants and/or have been donors. The purpose of this study is to see how well transplant works in adults with a MMUD using stem cells from a donor's blood, and in children with a MMUD using stem cells from a donor's bone marrow.This study treatment does not include any investigational drugs. The medicines and procedures in this study are standard for transplant. Participants can expect to be on this study for approximately 1 year.

This study is for children and adults that have been diagnosed with a disease that is associated with Epstein-Barr Virus (EBV) infection.The investigational treatment in this study is called tabelecleucel (also known as ATA129), this treatment is given in the vein. Participants will receive tabelecleucel on Day 1, Day 8 and Day 15 of every 35-day (5-week) period, the number of cycles depends on the response to treatment. The purpose of this study is to assess the safety of tabelecleucel and to assess the effects of tabelecleucel on EBV disease. Participants can expect to be in this study for about 2 years for an estimated 17-20 study visits.

This study is for patients who have been diagnosed with a respiratory viral infection, like respiratory syncytial virus (RSV), influenza, human metapneumovirus, and/or parainfluenza virus, after a hematopoietic cell transplant. The investigational drug in this study is ALVR106. The purpose of this study is to determine if ALVR106 is safe and to determine the best dose (amount) for treating respiratory infections. Participants can expect to be in this study for approximately 1 year.

This study is for children age 0-2 who have been diagnosed with severe combined immunodeficiency (SCID). In this study, participants will be randomized (select by chance) into groups that will decide the dose of chemotherapy they will receive, receive chemotherapy prior to a blood stem cell transplant, and have blood drawn for research tests. The purpose of this research study is to find out if lower doses of a chemotherapy drug called busulfan before stem cell transplant can help patients with SCID, and to see if the device the CliniMACS® is effective in preparing donor stem cells before the transplant. Participants can expect to be in this study for up to 3 years.

This study is for subjects that are about to receive high dose cyclophosphamide before a blood or bone marrow transplant (BMT). The investigational drug in this study is Olanzapine.This research is being done to find out whether adding olanzapine to standard antiemetics will be helpful in controlling CINV in children receiving chemotherapy a blood or bone marrow transplant. To find this out, some of the participants in this study will get olanzapine and others will receive a placebo (a substance that looks like olanzapine but does not have any active or medicinal ingredients). This will allow us to compare treatment of CINV with and without olanzapine.

This study is for patients that have been diagnosed with Epstein-Barr Virus associated Post-Transplant Lymphoproliferative Disorder (EBV-PTLD). The investigational drug in this study is tabelecleucel. Tabelecleucel is a product containing special immune allogeneic cells, called EBV-Cytotoxic T Lymphocytes (EBV-CTLs), that are made in the laboratory starting with cells from a healthy person who is immune to EBV. The purpose of this study is to test how well tabelecleucel works to treat EBV-PTLD following SOT in patients who have not responded to rituximab or rituximab plus chemotherapy treatment and to see what side effects happen. Your participation will help us to understand more about tabelecleucel. In the first 12-month period, participants will be asked to come to the clinic for an estimated 11 to 19 study visits and a minimum of 2 scans, depending on the number of cycles of treatment they are given. After treatment is done, participants will enter into the follow-up phase, and will continue to come into the clinic for scheduled check-ups for up to 24 months after the first dose of tabelecleucel was given. Participant information on the status of their disease and any new treatment will be collected for up to an additional 3 years. Participants can expect to be in this study for up to five years total.

The primary purposes of this study are to:
•Provide access to cord blood units for recipients whose best choice for a cord blood unit(s) do not meet all FDA standards, but do meet standards set by the NMDP on this study.
•Assess how well and how quickly blood counts return to normal after transplant in recipients on this study.