Incidence of prostate cancer Prostate cancer was considered a western disease in the past, and its incidence was extremely low in China. However, in recent years, with the improvement of China’s economic level and the gradual change of lifestyle, the incidence of prostate cancer has been increasing, and now it has jumped to the first place of male genitourinary system tumors. According to the statistics of Beijing, Shanghai and other large cities, the incidence of prostate cancer in China was about 1.6 cases/100,000 people in 1973, increased to 4.6 cases/100,000 people in 1995, and 7.7 cases/100,000 people in 2000. Based on past statistics, it is conservatively estimated that the current incidence of prostate cancer in China is at least 12 cases per 100,000 people. Clinical manifestations and diagnosis of prostate cancer The clinical manifestations of prostate cancer are similar to those of benign prostatic hyperplasia, usually manifesting as difficulty in urination, frequent urination, urgent urination, increased nocturia, and urinary retention. The clinical manifestations are insidious and difficult to distinguish. Therefore, all elderly patients with the above clinical manifestations should have their serum PSA level measured. PSA is the abbreviation for prostate-specific antigen, and the normal level is below 4ng/ml. When the PSA level exceeds 10ng/ml or more, you should be highly alert to the possibility of prostate cancer. Rectal finger examination is also an important tool to diagnose prostate cancer. The urologist can get a lot of important information through finger examination, such as the size, hardness and the presence of nodules of the prostate. Ultrasound examination is equally important as rectal examination. Ultrasound examination is able to see the prostate shape and internal lesions more clearly, and some smaller prostate nodules cannot be reached by rectal examination, while ultrasound examination can accurately find their location and measure their size.