There was no association between lethality and ERG-positive or ERG-negative status. Those who used statins for more than 5 years were less likely to have a PTEN-null tumor (hazard ratio, 0.42; 95% confidence interval, 0.20-0.90) but not more likely to have a PTEN-positive tumor (HR, 1.18; 95% CI, 0.95-1.46).
Compared with never users, long-term statin users also were less likely to have advanced prostate cancer (multivariate analysis, HR, 0.62; 95% CI, 0.45-0.85) as well as lethal prostate cancer (HR, 0.52; 95% CI, 0.35-0.78).
The researchers conducted a gene set enrichment analysis in statin users and found an enrichment of T-cell, B-cell, and PI3K signaling in tumor-adjacent normal prostate tissue, as well as other changes. “We think maybe there’s a microenvironment inflammation component to the mechanism through which statins are associated with lower risk of lethal prostate cancer,” said Dr. Allott.
The molecular data could identify patient subgroups that could benefit from statins. Dr. Allott said that is the goal, but it will take time. “That’s more obviously translatable to the clinic, but we don’t yet have enough data in this cohort to look at that.”
SOURCE: Allott E et al. AUA 2018, Abstract MP21-01.