A medical oncologist is a physician who specializes in treating people with various types of cancer, but cancer is often a very complicated disease. Because of the complexity of cancer and its treatments, additional subspecialties have evolved within the field of oncology. The subspecialties in oncology include gynecological oncology, pediatric oncology, surgical oncology, neuro-oncology, radiation oncology, surgical oncology, medical oncology, interventional oncology, hemato-oncology, uro-oncology. The requirements for each subspecialty may vary. In general, after completing a residency in medical oncology, an additional post residency fellowship in the specific subspecialty of interest is required. This session discusses more about oncology subspecialties.