A study to evaluate if the randomized addition of venetoclax to a chemotherapy backbone (fludarabine/cytarabine/gemtuzumab ozogamicin \[GO\]) improves survival of children/adolescents/young adults with acute myeloid leukemia (AML) in 1st relapse who are unable to receive additional anthracyclines, or in 2nd relapse.

The goal of this clinical study is to learn more about the long-term safety, effectiveness and prolonged action of Kite study drugs, axicabtagene ciloleucel, brexucabtagene autoleucel, KITE-363, KITE-753, KITE-197, and anitocabtagene autoleucel in participants of Kite-sponsored interventional studies.