Welcome to the other side. Your large prostrate size does reduce your chance of BCR.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3102877/[url]
"In agreement with previous reports (20, 21), we showed that men with smaller prostates were at a significantly higher risk of BCR. The reason for this remains unknown; however, many potential explanations exist. First, it has been suggested that men with smaller prostates may have lower levels of testosterone, which has been shown to correlate with more aggressive prostate cancer (22). Second, men with larger prostates had their tumors detected earlier because of PSA-driven biopsies resulting from PSA elevation from an enlarged gland. This lead-time bias would be expected to result in better outcomes (23). As shown in Table 1, the extra-prostatic group had a higher PSA than the organ-confined group. The PSA range was 3.7-95.8 ng/mL. Thus, a PSA-driven biopsy group that had a large portion of benign tissue is difficult to be included. Third, a tumor within a small prostate has to migrate a lesser distance to escape the prostatic capsule, as demonstrated by Yadav et al. (24), who showed that decreased prostate volume is a predictor of extra-prostatic extension. It is likely that a combination of these factors leads to a greater chance of BCR after treatment for men with smaller prostate volume. The most important finding in our study was obtained from the analysis of prostate volume stratified by pathologic T stage. Our data showed that prostate volume was not prognostic in the pT3 group."