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This study aims to evaluate the side effects (good and bad) of giving Vincristine Suflate Liposome Infection (also known as Marqibo®) - a drug approved for leukemia treatment in adults but that is experimental in children - with other standard chemotherapy drugs and to measure how effective the combination is at treating children and young adults with leukemia that has come back after initial treatment.

The objective of this study is to better understand the effects of chronic diseases, such as congenital heart disease, on blood vessel function and on blood characteristics.