Oncology is the branch of medicine that studies and treats neoplasms, with special attention to malignant tumors or cancer. As a medical specialty, derived from internal medicine, it is dedicated to the diagnosis and treatment of cancer, focusing on the care of the cancer patient and their treatment, including chemotherapy, hormone therapy, and other medications. As a surgical specialty, it deals with the removal of the tumor and surrounding tissues, and radiation oncology uses radiotherapy to treat cancer.