In order to improve treatment for Acute Lymphoblastic Leukemia (ALL) and other types of cancer, it is very important to learn more about the biology and characteristics of ALL. This is why doctors and medical researchers want to study samples of ALL cells. They want to understand why some cases of ALL relapse while others don’t. They also want to understand what makes the leukemia cells different from normal body cells and if there are differences in the normal body cells between patients who develop ALL and people that do not, or between the normal body cells of patients with ALL that relapse and other patients with ALL that don’t relapse.
The purpose of this study is to collect leukemia cells and normal blood cells from patients with ALL that relapse, and to store them for use in future research studies.