Celnase 10000 IU Injection contains L-Asparaginase, an enzyme-based chemotherapy medication primarily used to treat acute lymphoblastic leukemia (ALL)—a type of blood and bone marrow cancer. It works by breaking down asparagine, a vital nutrient that leukemia cells need to survive and multiply, effectively starving and killing the cancer cells. [1, 2, 3, 4, 5]