What Is an Oncologist?

An oncologist (ahn-KOL-eh-jist) is a doctor who diagnoses and treats different types of cancer.

What Is Oncology?

Oncology (ahn-KOL-eh-jee) is the medical specialty focused on the study, diagnosis, and treatment of cancer.

Why Would Someone Need an Oncologist?

Oncologists diagnose and treat cancer. They:

• find out what stage a person's cancer is in (how much cancer is in the body and where it is)
• prescribe cancer treatment, such as medicines, chemotherapy, radiation therapy, stem cell transplants, and surgery
• give ongoing care for patients during and after cancer treatment

What Do Oncologists Do?

They do medical tests and procedures such as:

• biopsies
• bone marrow aspiration and biopsy
• bone scan (used to find cancer or see how well treatment is working)
• blood cell count tests
• tumor marker tests (to look for substances made by cells in response to cancer)

Education and Training

An oncologist's training typically includes:

• 4 years of pre-medical education at a college or university
• 4 years of medical school — a medical degree (MD) or doctor of osteopathic medicine (DO) degree
• 3 years of residency (professional training in a hospital or clinic) in internal medicine or pediatrics
• 3 years of fellowship in oncology and hematology. A “fellow” is a doctor who had more specialty training after completing medical school and residency training.

They can also do special training in a subspecialty area — for example, a specific kind of cancer.

Surgical oncologists first become general surgeons in a 5-year residency and then complete a fellowship in surgical oncology and the removal of tumors.