Cancer is a disease of genetic and epigenetic disorder. Abnormalities in genes that control cell proliferation lead to the unrestrained growth and other malignant phenotypes. Initiation and development of cancer is caused by both environmental and hereditary factors and the process of transformation from a normal cell to cancer cell remains unknown. Besides surgery, radiotherapy and chemotherapy, a new strategy, gene therapy, is proposed as a new approach to control or cure cancer. How...