Liver cancer
This organ is closely related to the gastrointestinal system, too. It is a common site of metastasis when cancer affects another place, but there are many cases of primary liver cancer due to the incidence of alcoholism. Liver cancer due to alcoholism is usually associated with a history of fibrosis and cirrhosis of the liver. Another common cause of liver cancer is hepatitis B infections, which usually go chronic and affects patients for a prolonged time causing inflammation that predisposes to cancer.