Michael R. Folkert, MD, PhD, discusses real-world outcomes with spacer in prostate cancer

Real-world data indicate a significantly lower incidence of all-cause bowel disorders in patients with prostate cancer who received radiotherapy treatment along with placement of a polyethylene glycol-based hydrogel spacer (spaceOAR) vs patients who did not receive a spacer.¹

Discussing the study with Urology Times®, Michael R. Folkert, MD, PhD, explained, “What we were doing with this study is we were trying to look at real-world data for spacer use. We have a lot of prospective data to guide us in in our care of patients, but it's nice to see what happens when you actually apply it to real patients.” Folkert is a professor of radiation oncology at the University of Washington School of Medicine, Seattle.

For the study, Folkert and his colleagues evaluated data on patients from 4 separate data sets: Medicare 5% Standard Analytic Files, Medicare 100% Standard Analytic Files, Merative MarketScan Commercial Database, and Premier Healthcare Database. Patients with prostate cancer who were treated with radiotherapy between 2015 and 2021 were included in the analysis.

“From those data sets, we were able to extract a range of codes for disorders and procedures that were related to bowel complaints to bowel disorders, and then conducted an analysis to probe associations between these codes and the use of rectal spacers, and then a comparison also of disorders and procedures the same sets of disorders and procedures related to bowel complaints and disorders on an age-matched general population that didn't have prostate cancer, to kind of ground the that experience in a general population,” Folkert said.

Regarding their findings, “4 years following radiation therapy, there is a 25% lower hazard of bowel disorders and a 46% lower hazard of related procedures [in patients who received a spacer],” Folkert said.

REFERENCE

1. Folkert MR, Sato R, Yu JB, et al. Bowel disorder incidence and rectal spacer use in patients with prostate cancer undergoing radiotherapy. JAMA Netw Open. 2025;8(3):e250491. doi:10.1001/jamanetworkopen.2025.0491