Prostate cancer generally affects men over the age of 50, and is rarely found in younger men. Around 32,000 men in the UK are diagnosed with prostate cancer each year. It differs from most other cancers in the body, in that small areas of cancer within the prostate are very common and may not grow or cause any problems for many years.

      About one in three men over the age of 50 have some cancer cells within their prostate and nearly all men over the age of 80 have a small area of prostate cancer. Most of these cancers grow extremely slowly and so, particularly in elderly men, will never cause any problems.

     In a small proportion of men, the prostate cancer can grow more quickly and in some cases may spread to other parts of the body, particularly the bones.

    前列腺癌一般影响50岁以上的男性，极少有年轻人患病。英国每年新发病例32000人，它不同于其他部位的癌。在前列腺内小范围癌极常见并且不生长或多年不造成严重后果。

   但在一小部分人群，前列腺癌生长迅速，部分病例发生全身转移，特别是骨转移。

（refer from CANCERBACKUP )