Cancers can be classified into two broad types: hematological or solid tumors. There are two main types of solid tumors: carcinomas and sarcomas. Most solid tumors are derived from epithelial cells. Carcinomas are tumors that form in epithelial cells. Neoplastic epithelial cells generate aggressive cancers such as those located in the lung, breast, colon, prostate and ovary. Some cancers of the bladder ureters and kidneys are transitional cell carcinomas. Sarcomas are tumors that start in tissues like a blood vessel, bone, fat tissue, ligament, lymph vessel, muscle or tendon. Examples are given as follows: osteosarcoma, chondrosarcoma, rhabdomyosarcoma, leiomyosarcoma and so on.