ABSTRACT
A general classification relates to the tissue type where a tumor emerges. Cancer cells have some unique properties that help them compete successfully against normal cells. Chemotherapy is based on the systemic administration of anticancer drugs that travel throughout the body via the blood circulatory system. Use of pharmacological therapy for cancer varies by both geographic area and tumor type. Lung cancer patients are most likely to be treated with drugs, with around 99% of them being treated with drugs at the first line treatment stage. In an ideal situation, cancer cells would constitute a target of the patient host immune system. To single out cancer cells, an immunotherapy must be able to distinguish them from normal cells. A promising therapeutic strategy focuses on blocking tumor angiogenesis, i.e. the inhibition of the growth of new blood vessels in tumors. Advanced cancer therapies also include the use of tissue-specific cytotoxic agents.
