Cancers formed from the two processes require different treatment strategies. There are three stages involved in chemical carcinogenesis. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. Carcinogenesis comparative oncology ncbi bookshelf. Cancer, how cancer starts, how cancer spreads, where and why, animation. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. Introduction public opinion considers cancer to be an increasingly. Potential to alter the balance of cell growth and proliferation mitogenic mimic growth factors inhibit apoptosis phenobarbitol rodent liver cancers. Pediatrics and human development michigan state university. Proteins encoded by these target genes have functions essential for s or m phases, e.
According to a recent description, six essential alterations in cell physiology collectively dictate malignant growth. Differentiated cells as target cells for the carcinogenic process. Stem cell theory of carcinogenesis classical and most recent evidence chiacheng chang, ph. Either mutations or epigenetic events may confer the malignant phenotypes of invasiveness and metastasis. With respect to the timing of carcinogenesis, while the incidence of leukemia was high between 520 years after the exposure to atomicbomb radiation, that of lung cancer is still high even now, more than 50 years since the. Ultraviolet uv light and ionising radiation two main forms of radiation carcinogens which can induce cancer in experimental animals and are implicated in causation of some forms of human cancers. Colonizacion metastasica vi inmunidad y cancer capitulo ii carcinogenesis genito mamaria. Nonradiation physical agents are the various forms of injury and are less important. The last of these stages, progression, is exclusive of malignant transformation and implies the capacity to invade. The various hallmarks of cancer aid in cell survival, proliferation, and dissemination. Winner of the standing ovation award for best powerpoint templates from presentations magazine. We consider the use of the terms carcinogenesis, cancer inducing factors or carcinogenic factors more adequate for what happens during tumor cell transformation, with the mention that the term carcinogenesis defines the initiation of a.