Study Status: Recruiting
Recruit Status: Recruiting
Study Type: Observational
Official Title: A Children's Oncology Group Protocol for Collecting and Banking Relapsed Acute Lymphoblastic Leukemia Research Specimens
Brief Summary: This research study is collecting and storing samples of bone marrow and blood from patients with relapsed acute lymphoblastic leukemia or relapsed non-Hodgkin lymphoma. Collecting and storing samples of bone marrow and blood from patients with cancer to study in the laboratory may help doctors learn more about cancer and help predict the recurrence of cancer.