Abnormal cell division :
We are all acquainted with the terms, 'Tumor', 'Cancer', etc. These are the result of abnormal cell division. In mitosis one cell divides into two, two to four and in this way the number of cell increases But there is a regularity in this process. If by any circumstances this regularity is lost, cell divides abnormally. As a result, a tumor is formed.
Cancer cell is also a product of uncontrolled abnormal cell division. It has been found in experiment that various type of Papilloma virus help to produce cancer cell. Two genes named E6 and E7 of this virus (Papilloma) produce some chemicals, which displace two protein moleculesresponsible for controlling the cell division. As a result, control over cell division is lost and thus a tumor is produced. Sometimes these two genes may be united with-the genes of host cell and stop the action of protein to control the cell division and thus there develop cancer cell or Cancer.
Cancer is a fatal disease. Every year five to six hundred thousand of patients die only because of various forms of cancer. Cancer generates in liver, lunge, brain, breast and skin i.e. almost all the organs of the body. No effective medicine has yet been discovered to prevent this disease.