This study is for children and young adults under 22 who have leukemia, a type of blood cancer, that has returned after treatment or is tough to treat. Doctors will collect blood and bone marrow samples to learn more about the leukemia and find better ways to treat it. Bone marrow is the soft tissue inside bones that makes blood cells. If you join the study, doctors will collect samples at the start, after treatment cycles, and if the disease comes back. After finishing the study, there will be follow-up visits every 3 months for 2 years, then every 6 months for 3 more years.
- Study participation involves regular sample collection and follow-ups.
- Eligibility includes being under 22 and having specific types of leukemia.
- Written consent is needed from participants or guardians.