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An oncologist is a physician who specializes in the study, diagnosis, and treatment of cancerous tumors. Because cancer can affect any organ in the body, and individuals of any age, there are many different kinds of oncologists. For example, medical oncologists have studied internal medicine and treat cancer through chemotherapy. Pediatric oncologists are pediatricians who specialize in cancers that affect infants and children. Gynecological oncologists specialize in cancers that attack the female reproductive organs, including the ovary, cervix, and uterus. Radiation oncologists treat tumors through radiation therapy. Surgical oncologists are surgeons who specialize in removing cancerous tissue to prevent its growth. There are many other subspecialties within the practice of oncology. In fact, there are almost as many different subspecialties of oncology as there are different kinds of doctors.