This phase IV trial studies how well standard chemotherapy works in treating young patients with medulloblastoma or other central nervous system embryonal tumors. Drugs used in standard chemotherapy work in different ways to stop the growth of tumor cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading.

The investigators want to study if lower doses of chemotherapy will help babies with SCID to
achieve good immunity with less short and long-term risks of complications after
transplantation. This trial identifies babies with types of immune deficiencies that are most
likely to succeed with this approach and offers them transplant early in life before they get
severe infections or later if their infections are under control. It includes only patients
receiving unrelated or mismatched related donor transplants.

The study will test if patients receiving transplant using either a low dose busulfan or a
medium dose busulfan will have immune recovery of both T and B cells, measured by the ability
to respond to immunizations after transplant. The exact regimen depends on the subtype of
SCID the patient has. Donors used for transplant must be unrelated or half-matched related
(haploidentical) donors, and peripheral blood stem cells must be used. To minimize the chance
of graft-versus-host disease (GVHD), the stem cells will have most, but not all, of the T
cells removed, using a newer, experimental approach of a well-established technology. Once
the stem cell transplant is completed, patients will be followed for 3 years. Approximately
9-18 months after the transplant, vaccinations will be administered, and a blood test
measuring whether your child's body has responded to the vaccine will be collected.

This phase III trial compares the effect of an accelerated schedule of bleomycin sulfate, etoposide phosphate, and cisplatin (BEP) chemotherapy to the standard schedule of BEP chemotherapy for the treatment of patients with intermediate or poor-risk germ cell tumors that have spread to other places in the body (metastatic). Drugs used in chemotherapy, such as bleomycin sulfate, etoposide phosphate, and cisplatin, work in different ways to stop the growth of tumor cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading. Giving BEP chemotherapy on a faster, or accelerated schedule may work better with fewer side effects in treating patients with intermediate or poor-risk metastatic germ cell tumors compared to the standard schedule.

This trial uses fluid measurements of the arm and MRI to determine biomarkers of lymphatic dysfunction in patients with breast cancer. Studying the lymphatic system (the part of your body that helps to process and clear waste products) in different ways will help doctors understand more about lymphedema (excess fluid after lymph nodes are removed) and help with prevention and management of lymphedema in patients with breast cancer.

This trial studies health outcomes after treatment in patients with retinoblastoma. Gathering health information over time from patients and family members through vision assessments, samples of tissue and saliva, and questionnaires may help doctors learn more about what causes retinoblastoma, identify long-term health outcomes for patients with retinoblastoma, and find out which therapies may be the best for treating retinoblastoma.

The purpose of this study is to determine the clinical benefit and characterize the safety
profile of tabelecleucel for the treatment of Epstein-Barr virus-associated post-transplant
lymphoproliferative disease (EBV+ PTLD) in the setting of (1) solid organ transplant (SOT)
after failure of rituximab and rituximab plus chemotherapy or (2) allogeneic hematopoietic
cell transplant (HCT) after failure of rituximab.