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An oncologist is a doctor that specializes both diagnosing and treating cancer. This is a general term for treating any type of cancer. Some oncologists become specialists for a specific type or area.

An oncologist is a doctor who treats cancer and provides medical care for a person diagnosed with cancer. The field of oncology has three major areas: medical, surgical, and radiation. A medical oncologist treats cancer using chemotherapy or other medications, such as targeted therapy or immunotherapy.