Cancer can occur anywhere in the body. The most common sites of cancer among men involve lung, prostate, colon, rectum, stomach, Brain and liver. Those for among women are breast, colon, rectum, lung, cervix, ovarian and stomach. Cancers are often described by the body part that originated in. Some body parts contain multiple types of tissue, so for greater precision, cancers can additionally be classified by the type of cell that the tumour cells originated from. The type of cancer a person has needed to be known properly as many types of cancer can behave very differently and respond to different treatments.