General Info

Januario E. Castro, M.D., is a hematologist and oncologist at Mayo Clinic Comprehensive Cancer Center in Phoenix, Arizona. Dr. Castro treats chronic lymphocytic leukemia and lymphoma. He is an expert in CAR-T cell therapy, stem cell therapy and gene immunotherapy. He is interested in new drugs and treatment options for people with acute and chronic leukemias and lymphomas. Dr. Castro speaks English and Spanish. Mayo Clinic is the #1 hospital in Arizona, according to the U.S. News & World Report, and the Cancer Center continually ranks among the top hospitals in the U.S. for Cancer. Mayo Clinic Comprehensive Cancer Center is a National Cancer Institute (NCI)-designated comprehensive cancer center.