Can benign tissue regrow after prostatectomy, and how fast?

The short version: benign prostatic tissue can regrow after prostatectomy, but the evidence here is thin on how fast.

The retrieved studies are mostly about cancer recurrence after radical prostatectomy, not about regrowth of benign tissue. One study of 1,308 men with extremely low-risk prostate cancer found that 99.1% had undetectable PSA after surgery, 0.6% had measurable PSA that stayed low, and only 0.3% had biochemical recurrence [3]. The two men with measurable but stable PSA had doubling times of 101.7 and 33.5 months, far slower than the 12.6 months seen in true recurrence [3]. That pattern—persistent low PSA without rise—is the signature of leftover benign tissue, not cancer.

A separate study of 331 men with the same low-risk profile found that those with a postoperative PSA doubling time longer than 12 months had favorable pathology and PSA levels that never exceeded 0.25 ng/mL over a median of 3.6 years [2]. The authors explicitly note that this could represent residual benign tissue rather than indolent cancer [2]. After surgery for BPH itself (TURP, HoLRP, open prostatectomy), PSA drops sharply and then stays low, confirming that the bulk of benign tissue is removed and does not rapidly return [1].

What the evidence does not give is a regrowth rate in grams per year. The studies that track PSA after surgery are using it as a proxy for cancer, not for benign regrowth. The slow PSA doubling times in the low-risk groups suggest that if benign tissue does regrow, it happens over years, not months. But no study here measured prostate volume over time after prostatectomy in men without cancer.

My call: Benign tissue can persist or slowly regrow after prostatectomy, but the evidence does not give a speed. The pattern is a very slow PSA rise over years, not rapid regrowth. Confidence: moderate for the existence of regrowth; low for the rate, because no study here directly measured it.