The FDA has approved Mozobil (plerixafor), a drug that helps increase the number of blood stem cells for bone marrow transplantation in patients with certain forms of blood cancer. Mozobil is intended to be used in combination with the growth factor granulocyte-colony stimulating factor (G-CSF), for treatment of adults with multiple myeloma or non-Hodgkin’s lymphomas. Multiple myeloma is cancer of the plasma cell, a cell in the bone marrow that produces antibodies to help fight infection and disease. Non-Hodgkin lymphomas are a diverse group of blood cell cancers derived from lymphocytes, a type of white blood cell. Prior to receiving high-dose chemotherapy or radiation therapy, patients with these forms of cancer sometimes undergo a procedure known as apheresis in which blood stem cells are collected and stored for reinfusion after therapy. G-CSF is commonly administered to help release and collect stem cells from the bone marrow. Mozobil is an injectable drug that, when used in combination with G-CSF, boosts the number of stem cells released from the bone marrow into the blood stream. “Collecting the millions of cells needed for a bone marrow transplant can take hours or days,” said Richard Pazdur, M.D., director, Office of Oncology Drug Products, Center for Drug Evaluation and Research, FDA. “Mobozil provides a new therapeutic option for patients with certain types of blood cancers by increasing the number of stem cells collected in a given time period to be reinfused after therapy.” In two randomized clinical trials – one in patients with non-Hodgkin’s lymphoma, the other with multiple myeloma – Mozobil combined with G-CSF increased the number of stem cells available for collection and transplantation compared with patients receiving G-CSF alone. The most commonly reported adverse reactions in these trials and other smaller studies were diarrhea, nausea, fatigue, injection site reactions, headaches, joint pain, dizziness and vomiting. Mozobil is manufactured by Genzyme Corp., Cambridge, Mass.