Identification of Necessary Information for Treatment Induction in Newly Diagnosed Acute Lymphoblastic Leukemia/Lymphoma

This study is looking at what information doctors need right at the start of treatment for children newly diagnosed with acute lymphoblastic leukemia (ALL) or lymphoblastic lymphoma — a cancer of the blood and lymph system. The goal is to identify which early test results are most critical for guiding treatment decisions. **You may be eligible if...** - Your child is between 1 and 18 years old - Your child has been newly diagnosed with ALL, lymphoblastic lymphoma, or mixed phenotype acute leukemia (a cancer involving multiple blood cell types) **You may NOT be eligible if...** - The patient is pregnant or breastfeeding - The patient has already received cancer treatment (with limited exceptions such as a single dose of certain chemotherapy drugs or emergency radiation) Talk to your doctor to see if this trial is right for you.