Cancers may be Benign or Malignant. Benign Cancers fail to spread to other tissues are non-life threatening. Malignant tumors are invasive and spread to other tissues within the body. Various types of tumors are reported till date and many are under research investigation. Some tumors are named after discoverer, which include Wilm's Tumor, Hodgkin's disease, Kaposi's sarcoma. Some Cancers are divided into groups according to the type of cell they start from; include Carcinomas are cancers of epithelial cells, Sarcomas represent tumors of connective tissues and Leukemias and Lymphomas refer to Cancers of blood cells. Organ specific Cancers include Lung Cancer, Brain Cancer, Heart tumors and many more. Endocrine Cancers include Pituitary Cancer, Thyroid Cancer, Parathyroid Cancer and Adrenal Cancers. Gastrointestinal cancers include Liver cancer, Gall bladder cancer, Pancreatic Cancer, Gastrointestinal Cancer, Colorectal Cancer, Rectal cancer, Anal cancer.