The prostate produces secretions which constitute one of the components of the sperm, with the secretion of seminal vesicles and that of testicles.
This last one is conveyed by vas deferens. The vas deferens run from testicles up to the urethra which they join at the level of the prostate.
The diverse diseases which can develop at the level of the prostate can be responsible for a blockage in the evacuation of bladder urinary flow preventing the patient from urinating.
The increase in prostate volume is not necessarily due to cancer.
Many men present a benign, non cancerous hypertrophy, of their prostate, also called Benign Prostatic Hyperplasia (BPH) or prostate adenoma, and which can lead to a bladder outlet obstruction.
This benign prostatic hypertrophy does not increase the risks of occurence of true prostate cancer. It is not a pre-cancerous disease.
But it is a usual cause of Lower Urinary Tract Symptoms (LUTS), which create discomfort for men.