前列腺癌（Prostate cancer）是出自前列腺的恶性肿瘤。大多数前列腺癌生长速度较为缓慢，但仍有些生长相对快速。癌细胞可转移到骨头和淋巴结等部位。前列腺癌早期可能没有症状，晚期可导致排尿困难、尿血、背痛、骨盆疼痛等症状。前列腺肥大也会导致类似的症状。晚期症状还包括因红细胞数量低导致的疲倦。

前列腺癌的风险因子包含高龄、家族病史、种族等。约99%的病例中患者年龄超过50岁。父、母、手足等亲属患有本病时，发病风险较常人高出2至3倍。美国疾病控制中心统计显示美国非裔前列腺癌发病率最高，欧裔其次，亚裔族群前列腺癌发病率最低。其他风险因子包含饮食中包含大量乳肉制品（红肉、加工肉品、乳制品）或缺乏某些蔬菜。前列腺癌可由活体组织切片确诊。医学影像技术可检测癌细胞是否扩散到身体其他部位。

Prostate cancer, also known as carcinoma of the prostate, is the development of cancer in the prostate, a gland in the male reproductive system. Most prostate cancers are slow growing; however, some grow relatively quickly. The cancer cells may spread from the prostate to other parts of the body, particularly the bones and lymph nodes. It may initially cause no symptoms. In later stages it can lead to difficulty urinating, blood in the urine, or pain in the pelvis, back or when urinating. A disease known as benign prostatic hyperplasia may produce similar symptoms. Other late symptoms may include feeling tired due to low levels of red blood cells.