cancers
Cell division is the process by which a cell divides into another. Its purpose is to promote growth of tissues and organs of the body and replenish also the cells that are dying. It turns out that this process is strictly regulated: the cells receive signals that tell them when to divide or when to stop. But if there is failure self-destructive natural cellular system (called apoptosis) can lead to uncontrolled cell growth and cause a tumor or neoplasm.
If abnormal cells remain together, the tumor is classified as benign. If abnormal cells invade surrounding tissues or travel through the bloodstream or the lymph stream to other parts of the body to form secondary tumors or metastasis where the tumor is malignant, and is called cancer.
When a person is exposed to certain factors, called carcinogens, their chances of developing some type of tumor increases. Eg inheritance, high fat diets and obesity, ultraviolet radiation, snuff smoke and alcohol.
traditional therapies to combat cancers ranging from the removal surgery to radiation therapy, if used radioactivity to kill tumor cells, and chemotherapy, where drugs are used to interrupt the cycle of reproduction of cancer cells. Currently, other less aggressive techniques developed through the use of drugs that attack only cancer cells and not those that are healthy. Gene therapy consists in correcting genetic defects from the introduction of genes in diseased cells healing.
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