This study is for participants that have been diagnosed with Medulloblastoma. The purpose of this study is to test the effectiveness of using an investigational agent called DFMO for Medulloblastoma. An investigational drug is one that has not been approved by the U.S. Food and Drug Administration (FDA). This study will look at the ability of this study drug to either keep participants tumor in remission or if they have active tumor, for their tumor to respond to the treatment and will also look at the safety and tolerability of DFMO. After this first day participants will be seen in clinic once every 30 days for the first 6 months of the study, after that they will be seen once every 90 days for the remainder of the study. These visits will last about 2 hours.

This study is for participants with tumors from pediatric cancers and genomic/molecular testing was done as part of standard of care treatment. This is an observational study; therefore, only information about the disease and medical treatment will be collected and participants will not receive any treatments or additional medications. The sponsor, Beat Childhood Cancer, will collect and store personal health information and molecular/genomic test results, tissue samples, and bodily fluids (examples: additional tube(s) of blood, urine, bone marrow or cerebral spinal fluid) that are left over after testing or treatment is completed in a data registry and a specimen bank, and make these available for future research. Database personnel will continue to collect and store participant information from future visits, as long as they do not withdraw from participation in this study.

This study is for subjects that have been diagnosed with cancer, as well as healthy research subjects. The purpose of this study is to evaluate the risk factors for development of immune related adverse side effects from cancer immunotherapy and to evaluate differences from healthy research subjects. Participation in the study will take about 2 visits over a period of 6 months.

This study is for patients who have cancer and are experiencing loss of weight and appetite. The study wants to find out if this taking olanzapine for four weeks will increase your appetite as compared to megestrol acetate. The study is looking to see if that approach is better or worse than the usual approach for your loss of appetite and weight. The usual approach is defined as care most people get for loss of appetite.

This study is for subjects that have been diagnosed with AML (acute myeloid leukemia) and MDS (myelodysplastic syndrome). This study is testing an "investigational" (not yet FDA approved) study drug called Sea-CD70. This study will find out if the drug is safe and tolerable, and find out the maximum tolerated dose (highest dose of a drug or treatment that does not cause unacceptable side effects) or recommended dose for the next phase of clinical study. The subject will be given the study drug in 28 day cycles. At any given visit, the subject may undergo procedures, such as a physical exam, blood samples, ECG (electrocardiogram), or a bone marrow exam. The subject may remain in the study for up to approximately 3 years.

This study is for patients who have been diagnosed with relapsed (the disease has gotten worse after a period of improvement) or refractory (the disease does not respond to treatment) Epstein-Barr Virus-Positive (EBV+) lymphomas.

The investigational drug in this study is Nanatinostat. Investigational means it is not approved by the United States' Food and Drug Administration (US FDA). Nanatinostat is a tablet that will be taken by mouth once a day.

The purpose of this research study is to determine the effectiveness and safety of the combination therapy, nanatinostat and valganciclovir, on treating lymphoma cancers. Valganciclovir is an approved anti-viral drug (a drug that fights against virus in your body), which has been used in the prevention and treatment of infection caused by a virus called cytomegalovirus (CMV), which is similar to Epstein-Barr virus (EBV). The safety and effectiveness of nanatinostat on its own will also be reviewed in a small subset of patients.

Participants can expect to receive treatment until disease progression, unacceptable toxicity/ side effects, or participants withdraw. Participants can expect to be in follow up for up to 5 years.

This study is for patients who have been diagnosed with multiple myeloma. The investigational drug in this study is idecabtagene vicleucel (ide-cel). The purpose of this study is to provide the investigational drug as a possible cancer treatment that would otherwise be unavailable. Patients can expect to have about 8 clinic visits and to be in this study for up to 3 months after receiving the study drug and in follow up for up to 15 years.

This study is for subjects with Diffuse large B-cell lymphoma (DLBCL) that has gotten worse or come back after two or more treatments. This study is testing an "investigational" (not yet FDA approved drug) study drug called loncastuximab tesirine (ADCT-402). Treatment will be administered intravenously or via tablet depending on the subject's assigned treatment. The primary purpose of this study is to test whether the investigational drug combination of loncastuximab tesirine in combination with one of four other anti-cancer agents is a safe and effective treatment for relapsed or refractory B-cell Non-Hodgkin Lymphoma. Treatment will be assigned by a system in a sequence unless the subject has received the combination drug (the drug that is not locastuximab). This means the first enrolled subject will be assigned to arm C, the second to arm E, and so on. The subject will be seen approximately once a week during treatment, and may remain in the study for up to 3 years.

This study is for patients who have been diagnosed with relapsed or refractory CD22+ B-Acute Lymphoblastic Leukemia (B-ALL). The overall goal of this study is to find out what effect, good and/or bad, the drug inotuzumab ozogamicin has on children and young adults with relapsed or refractory B-ALL. Participants can expect to be on this study for up 2 months and followed for up to 5 years.

This study is for participants that have been diagnosed with previously untreated CD30 Negative Peripheral T-cell Lymphomas. The purpose of this study is to determine if the effects (good or bad) of adding a study drug (duvelisib or CC-486 (azacitidine)) to the usual combination of drugs. Participants can expect to be on treatment for 18 months and followed by the study team for up to 5 years after study completion.