No residual tumor in a radical prostatectomy specimen after neoadjuvant hormonal therapy for localized prostate cancer

Abstract

The role of neoadjuvant hormonal therapy (NHT) before radical prostatectomy for localized prostate cancer remains controversial because many argue that apparent downstaging results in difficulties with the pathological evaluation of the neoadjuvant treated prostatectomy specimen. Furthermore, the downstaging to pT0 (no residual tumor), as reported by several institutions, remains questionable and is not yet confirmed by clinical or experimental evidence. To examine this issue and to assess the influence of NHT on downstaging, we investigated the stage pT0 status in radical prostatectomy specimens after NHT. We retrospectively reviewed 31 patients with histologically confirmed clinical stage T1c, T2 or T3 prostate cancer. All patients had received NHT for a mean duration of 5.2 months (range 2-19). We compared the pretreatment parameters (PSA, clinical stage, biopsy Gleason grade, number of positive cores, total length of cancer on each sextant biopsy or duration of NHT) to the pathological findings in the specimen sectioned at 3-mm thick after NHT. Five (16%) of 31 patients had no residual cancer (pT0) after radical prostatectomy, 8 (26%) had organ-confined disease (stage pT2), 6 (19%) had specimen confined disease, 10 (33%) had non-specimen confined disease and only 2 (6%) had lymph node metastasis. The histologic changes, including glandular atrophy and cytoplasmic vacuolation were stronger in specimens with a long duration (4 or more months) of NHT than those of a short duration (3 or less months). Multiple logistic regression analysis showed that only a longer duration of NHT was an independent predictor of a stage pT0 status in radical prostatectomy specimens after NHT (p=0.04, Odds ratio; 1.92, 95% CI; 1.03-3.56). Downstaging to pT0 occurs after duration of NHT of longer than 3 months. Further investigation of the optimal duration of NHT for downstaging and for improving patients' survival should be accomplished in randomized trials.