Oncology is the branch of medicine that studies tumors (cancer) and seeks to understand their development, diagnosis, treatment, and prevention.

A physician who practices oncology is an oncologist.
The term originates from the Greek onkos (ογκος), meaning bulk, mass, or tumor and the suffix -ology, meaning "study of".

The oncologist often coordinates the multidisciplinary care of cancer patients, which may involve physiotherapy, counselling, clinical genetics, to name but a few.

On the other hand, the oncologist often has to liaise with pathologists on the exact biological nature of the tumor that is being treated.

The American Society of Clinical Oncology (ASCO) is the world's leading professional organization representing physicians who treat people with cancer.

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