A Study to Compare Blinatumomab Alone to Blinatumomab With Nivolumab in Patients Diagnosed With First Relapse B-Cell Acute Lymphoblastic Leukemia (B-ALL)

B-ALL is a cancer of the white blood cells. White blood cells are made in the bone marrow, and these cells aid in fighting infections. White blood cells can mature into specialized cells with unique functions. With B-ALL, the white blood cells become abnormal as they mature. These abnormal white blood cells are called blasts. As the blasts grow and divide, they can displace normal, healthy cells. The blasts spread into the bloodstream. Blasts can also spread to the brain, spinal cord, testes, and other places in the body.

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