Long-Term Water Vapor Thermal Therapy Outcomes Across a Broad Range of Prostate Volumes

Water vapor thermal therapy (WVTT) is a minimally invasive therapy designed to treat lower urinary tract symptoms associated with benign prostatic hyperplasia. Long-term outcomes with large (>80 cc) and small (<30 cc) prostate volumes (PVs) remain limited. We report 48-month outcomes for a multiethnic cohort of WVTT-treated men, stratified by PV.

In this single-center retrospective study, patients were stratified by PV: < 30 cc, 30 to 80 cc, or > 80 cc. Outcome measures, including International Prostate Symptom Score, quality of life, International Index of Erectile Function, medication usage, and adverse events, were analyzed at baseline and at 1-, 3-, 6-, 12-, 24-, 36-, and/or 48-month follow-up.

Two hundred fifty-two patients met inclusion; 35 (13.9%) had PVs < 30 cc, 196 (77.8%) had PVs 30 to 80 cc, and 21 (8.3%) had PVs > 80 cc. Most patients were Asian (33.7%) or non-Hispanic Black (29.4%). International Prostate Symptom Score and quality of life improved in all cohorts from baseline at all follow-ups (all P < .05), with no differences between cohorts. International Index of Erectile Function-Orgasmic Function and -Erectile Function domains improved in 30 to 80 cc patients at 48 months. Alpha blocker and/or 5-alpha reductase inhibitor usage decreased at all follow-ups in < 30 cc and 30 to 80 cc patients and remained durable to only 6 months for > 80 cc patients. No significant differences in adverse events or reoperation rates were observed between cohorts.

Our study suggests WVTT to be efficacious, durable, and safe in managing lower urinary tract symptoms across PVs, although PV > 80 cc patients may require benign prostatic hyperplasia medication at long-term follow-up. Further research is desired to clarify WVTT's role regarding sexual function and in treating men with larger PVs.