Medical oncology means the treatment of cancer with drugs (chemotherapy). In other words, the branch of science dealing with chemotherapy is called medical oncology. However, it is not only limited to cancer treatment, but also deals with cancer prevention, cancer screening and early diagnosis of cancer.

In any period of life in the body and for any reason, cells in tissues and organs can multiply indefinitely by not complying with the biological rules they must comply with. The mass or group of abnormal cells containing these characteristics is called a tumor (benign mass) or neoplasm-cancer (malignant mass). Cancer refers to more malignant (malignant) tumors.