Cancer of the prostate has become the number one cancer in American men. In the United States, approximately 1 in every 11 men will develop prostate cancer during his lifetime. Prostate cancer becomes increasingly common with each decade of life. Over 80 percent of all cases are diagnosed in men over 65.
The incidence of prostate cancer increased 47 percent from 1973 to 1987, about a 2.6 percent increase each year. It is estimated that 106,00 new cases of prostate cancer were diagnosed in the US during the 1990. Black men in the US have the highest incidence of prostate cancer in the world.
Little is known about the cause of prostate cancer, and it is seldom possible to explain why a man has developed this disease. Scientists believe that cancer of the prostate develops over a period of many years as a result of gradual changes in the cells. No single theory explains the development of this disease, but a number of possible causes have been suggested. Investigations have focused on four general areas: genetic predisposition (heredity), hormonal influences, environmental and lifestyle factors, and sexually transmitted agents, including viruses. Data from population studies have produced opposite results. Some studies suggest a genetic predisposition to prostate cancer and an increased risk for... [continues]
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