EC Pharmacology and Toxicology

Cancer is a complex disease, 90 percent of all cancers caused by mainly by external environmental factors such as tobacco, alcohol, viruses, chemicals. Cancer is a process from tumor initiation, promotion and progression by various immune mediators, where chronic inflammation is considered as a seventh hall mark of cancer. In the long process of tumor progression takes many years and the cancer cells spread throughout the body and the mutations takes place to become cancer. In this process of tumor initiation to progression and in early diagnosis of cancer by biopsy there are many controversies in cancer. This article brief about the controversial views of cancer.

Keywords: Cancer; Tumor Initiation; Tumor Promotion; Tumor Progression