This phase III trial compares memantine to usual treatment in treating patients with primary central nervous system tumors. Memantine may block receptors (parts of nerve cells) in the brain known to contribute to a decline in cognitive function. Giving memantine may make a difference in cognitive function (attention, memory, or other thought processes) in children and adolescents receiving brain radiation therapy to treat a primary central nervous system tumors.

This phase III trial compares the effect of adding levocarnitine to standard chemotherapy vs. standard chemotherapy alone in protecting the liver in patients with leukemia or lymphoma. Asparaginase is part of the standard of care chemotherapy for the treatment of acute lymphoblastic leukemia (ALL), lymphoblastic lymphoma (LL), and mixed phenotype acute leukemia (MPAL). However, in adolescent and young adults (AYA) ages 15-39 years, liver toxicity from asparaginase is common and often prevents delivery of planned chemotherapy, thereby potentially compromising outcomes. Some groups of people may also be at higher risk for liver damage due to the presence of fat in the liver even before starting chemotherapy. Patients who are of Japanese descent, Native Hawaiian, Hispanic or Latinx may be at greater risk for liver damage from chemotherapy for this reason. Carnitine is a naturally occurring nutrient that is part of a typical diet and is also made by the body. Carnitine is necessary for metabolism and its deficiency or absence is associated with liver and other organ damage. Levocarnitine is a drug used to provide extra carnitine. Laboratory and real-world usage of the dietary supplement levocarnitine suggests its potential to prevent or reduce liver toxicity from asparaginase. The overall goal of this study is to determine whether adding levocarnitine to standard of care chemotherapy will reduce the chance of developing severe liver damage from asparaginase chemotherapy in ALL, LL and/or MPAL patients.

This phase III trial studies how well lenalidomide and dexamethasone works with or without daratumumab-hyaluronidase in treating patients with high-risk smoldering myeloma. Drugs used in chemotherapy, such as lenalidomide, 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. Anti-inflammatory drugs, such as dexamethasone lower the bodys immune response and are used with other drugs in the treatment of some types of cancer. Daratumumab-hyaluronidase is a monoclonal antibody, daratumumab, that may interfere with the ability of cancer cells to grow and spread, and hyaluronidase, which may help daratumumab work better by making cancer cells more sensitive to the drug. Giving lenalidomide and dexamethasone with daratumumab-hyaluronidase may work better in treating patients with smoldering myeloma.

This phase III trial studies rituximab after stem cell transplant and to see how well it works compared with rituximab alone in treating patients with in minimal residual disease-negative mantle cell lymphoma in first complete remission. Immunotherapy with rituximab, may induce changes in bodys immune system and may interfere with the ability of tumor cells to grow and spread. Giving chemotherapy before a stem cell transplant helps kill any cancer cells that are in the body and helps make room in the patients bone marrow for new blood-forming cells (stem cells) to grow. After treatment, stem cells are collected from the patient's blood and stored. More chemotherapy is then given to prepare the bone marrow for the stem cell transplant. The stem cells are then returned to the patient to replace the blood-forming cells that were destroyed by the chemotherapy. Giving rituximab with or without stem cell transplant may work better in treating patients with mantle cell lymphoma.