An oncologist is a doctor who treats cancer and provides medical care for a person diagnosed with cancer. The field of oncology has 3 major areas based on treatments: medical oncology, radiation oncology, and surgical oncology.
Medical oncologists treat cancer using medication, including chemotherapy, immunotherapy, and targeted therapy.
Radiation oncologists treat cancer using radiation therapy, which is the use of high-energy x-rays or other particles to destroy cancer cells.
Surgical oncologists treat cancer using surgery, including removing the tumor and nearby tissue during a operation. This type of surgeon can also perform certain types of biopsies to help diagnose cancer.