Purpose: Discovery of prostatic adenocarcinoma limited to transurethral resection material generates a treatment dilemma. We investigated the usefulness of parameters shown to be associated with prognosis in prostate cancer (p53 and bcl-2 immuno-expression, DNA cell cycle analysis and Gleason score) to stratify these incidentally identified tumors to guide clinical decision making.
Materials and methods: Paraffin embedded tissues from transurethral prostate resection specimens containing T1a prostate adenocarcinoma from 44 patients who underwent resection between 1980 and 1990 were immunostained for p53 and bcl-2, and subjected to flow cytometry to determine DNA ploidy. Gleason score was determined by 2 pathologists independently. Statistical relationships among these 4 variables, tumor progression and cancer specific survival were analyzed.
Results: Six of 44 patients in the study population had cancer progression. Time to clinical progression was 4.5 years (range 7 months to 11 years). Most tumors stained negative for p53 and bcl-2. Only 2 tumors studied were aneuploid and neither of these 2 patients had cancer progression. Only Gleason score was a significant predictor of cancer progression on univariate and multivariate Cox regression analysis (p = 0.045 and 0.046, respectively). No tumor characteristics correlated with time to disease progression, including p53 and bcl-2 immuno-expression, and Gleason score (p = 0.182, 0.563 and 0.346, respectively). Positive immunostaining for p53 and bcl-2 did not occur together in the same tumor in significant fashion (p = 0.334), nor did either significantly occur more with aneuploidy (p = 0.237 and 0.307 respectively).
Conclusions: For T1a prostate cancer incidentally detected on transurethral prostate resection p53 and bcl-2 immuno-expression, and DNA ploidy do not predict survival or disease progression.