Oncology is a branch of medicine that deals with the study, treatment, diagnosis, and prevention of cancer. A medical professional who practices oncology is an oncologist. The name's etymological origin is the Greek word ὄγκος (ónkos), meaning "tumor", "volume" or "mass". Oncology is concerned with:

The diagnosis of any cancer in a person (pathology)
Therapy (e.g. surgery, chemotherapy, radiotherapy and other modalities)
Follow-up of cancer patients after successful treatment
Palliative care of patients with terminal malignancies
Ethical questions surrounding cancer care
Screening efforts:
of populations, or
of the relatives of patients (in types of cancer that are thought to have a hereditary basis, such as breast cancer)

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