Optimal Methods of Disease Detection in Children and Young Adults With Acute Lymphoblastic Leukemia in the Pediatric Oncology Branch

Background: Acute lymphoblastic leukemia (ALL) is the most common childhood cancer. It occurs when a bone marrow cell develops errors in its DNA. Certain tests are used to help detect the disease. But the results of these tests often disagree. Researchers want to review the results of tests of bone marrow and cerebrospinal fluid (CSF) from people with ALL. They want to try to find the best ways to detect the disease. Objective: To compare results of certain bone marrow and CSF tests for detecting ALL, in order to see how much and how often the results disagreed. Eligibility: Children and young adults with ALL or lymphoblastic lymphoma who were enrolled in certain previous studies and consented for their data to be used. Design: Investigators will review participants medical records. They will collect data like the participant s gender, age, and when their tests were done. They will also collect results from tests like: Bone marrow tests Flow cytometry tests Imaging CSF cell count All of the stored data will be labeled by a code that only the study team at the research site can link to the participant. Data will be stored in password protected computers. ...