This study is for young people with a type of cancer called leukemia that has come back after treatment or is hard to treat. Leukemia is a cancer of the blood and bone marrow, the spongy tissue inside bones where blood cells are made. The study will look at samples of blood and bone marrow to learn more about the cancer and find better ways to diagnose and treat it. Children, adolescents, and young adults under 22 years old who have specific types of leukemia can join this study. After joining, patients will have their samples collected at different times, and they will be checked every few months for up to 5 years. This will help doctors understand their condition better. Before joining, all participants and their guardians must agree and sign a consent form.
- Length: Regular check-ups for up to 5 years.
- Visits: Blood and bone marrow samples collected at different stages.
- Eligibility: Under 22 years old with certain types of leukemia.