Prostate cancer most commonly metastasizes to bones, with multiple bone metastases frequently observed clinically. In fact, the majority of prostate cancer patients already have multiple bone metastases by the time they are diagnosed. Therefore, bone is the most common distant organ to which prostate cancer spreads. Other distant organ metastases, such as to the lungs and liver, are less common, unless in very advanced stages of the disease. Additionally, prostate cancer commonly invades locally, spreading to nearby pelvic structures and tissues, such as the bladder and rectum, which is a common form of local invasion and spread.