oncology
Meaning of oncology: One word covering hundreds of separate diseases, oncology holds together because the questions asked of every cancer are broadly the same.
Definition of oncology
Oncology is the branch of medicine devoted to cancer, covering how it is diagnosed, classified, treated, prevented and studied. It is organized around three treatment approaches, drugs, radiation and surgery, and subdivided further by patient group and organ system. The field reaches beyond the clinic into laboratory research, screening programs and supportive care.
How oncology is built
- onc/o Combining form · Greek tumour, mass
- -logy Suffix · Greek study of, body of knowledge
A medical term is read from its ending backwards: the suffix first, then the prefix, then the root. See all 223 word parts.
How is the specialty divided?
| Branch | Focus |
|---|---|
| Medical oncology | Treatment with drugs: chemotherapy, hormonal therapy, targeted agents and immunotherapy |
| Radiation oncology | Treatment with radiation, planned to the shape and position of the tumor |
| Surgical oncology | Removal of tumors, and tissue sampling for diagnosis and staging |
Cutting across those three are subspecialties defined by who or what is affected: pediatric oncology, gynecologic oncology, hematologic oncology for cancers of the blood and marrow, neuro-oncology, and organ focused practice in areas such as breast, lung or gastrointestinal disease. Psycho-oncology addresses the mental health side. The clinical work depends on a wider workforce that includes the oncology nurse, oncology pharmacists, radiation therapists and palliative care teams.
What questions does oncology ask of every cancer?
Different as the diseases are, the sequence of questions repeats. Which cell did it start from, and what does the tissue look like under the microscope? Which genetic changes does it carry, since those increasingly decide which drugs can work? How far has it spread, which is what staging records? How is it likely to behave, which grade and molecular markers help predict? And what outcome is being aimed at, since the goal may be cure, long term control or comfort, and that choice shapes everything downstream. Because the same framework applies across the field, a method proved in one cancer often transfers to others.
What happens outside treatment?
A large part of oncology never involves treating an existing tumor. Prevention covers tobacco and alcohol, vaccination against cancer causing viruses, and exposure at work. Screening looks for disease in people who feel well, and the balance between catching disease early and finding abnormalities that would never have caused harm is argued over continuously inside the field. Survivorship care deals with the long term effects of treatment, some of which appear years later. Clinical trials run alongside routine care, and oncology carries one of the highest rates of trial participation in medicine, which is part of why standard treatment changes so quickly.
Used in a sentence
The patient was referred to oncology after imaging identified a suspicious mass.
Good to know
Oncology names the specialty as a whole, while an individual cancer is described by the cell it arose from and the site where it started, such as ductal breast carcinoma or small cell lung cancer.
Word origin
Where “oncology” comes from
Formed from Greek onkos, meaning mass or tumor, and -logia, meaning study of.