Oncology is concerned with cancer. The three primary disciplines are medical, surgical and radiation oncology. Medical oncology involves the treatment of cancer with drug therapy, including chemotherapy. Surgical oncology includes biopsy (sample taking), staging (examinations and tests to see the extent and spread of the cancer) and surgical resection (removal) of tumours. Radiation oncology involves treatment with therapeutic radiation. It is also called radiation therapy or radiotherapy. Oncologists may further specialise in specific types of cancer such as lung cancer, breast cancer, and so on. Paediatric oncology specialises in the treatment of children with cancer and incorporates all three primary oncology disciplines.