Neoadjuvant hormonal therapy prior to radical prostatectomy: evaluation of pathological downstaging and biochemical relapse.

OBJECTIVES

The effect of neoadjuvant hormonal therapy (NHT) prior to radical prostatectomy (RP) on pathological downstaging of prostate cancer and biochemical relapse of serum prostate specific antigen (PSA) level was evaluated.

MATERIALS AND METHODS

Twenty selected patients with prostate cancer, who were treated with hormonal therapy and demonstrated biochemical downstaging by reduction of PSA prior to RP and bilateral pelvic node dissection at the Tohsei National Hospital between January 1997 and August 2001, are reported on. The complete RP specimens of these 20 men were used for accurate evaluation of the pathological stage. All 20 patients received NHT; ten patients were treated with leuprolide plus flutamide and 10 received leuprolide plus chlormadinone acetate (CMA).

RESULTS

Decreases in serum PSA values were demonstrated from a pre-hormonal average of 49.7 ng/ml to an average of 0.52 ng/ml after NHT. Of the three clinical stages, A2-C, for cancer patients, two of the 20 patients had stage A2, two had stage B1, nine had stage B2, and seven had stage C. Of the 20 patients with biochemical downstaging, two had pathological stage B1, seven had pathological stage B2, eight had pathological stage C, and three had positive pelvic lymph nodes. Ten (50%) of the 20 patients were reported to have positive surgical margins. Seminal vesical extension was observed in two cases, and penetration was not observed. Positive nodes were identified in three (15%) patients. Among the seven clinical stage C patients, one had pathological stage B1 disease and two had pathological stage B2. Four of nine patients with clinical stage B2 prostatic cancer had pathological stage C disease. The actuarial incidence of a rising PSA at 3 years for the leuprolide plus CMA group was 28.9% compared with 37.5%for the group receiving leuprolide plus flutamide. The cases of biochemical relapse did not necessarily indicate a high stage and had no tendency to be high for baseline PSA level, positive margin rates or Gleason scores.

CONCLUSIONS

A significant decrease in the rate of penetration could be observed after NHT, though it was not so effective for pathological downstaging, and changes in the preoperative PSA level did not predict those patients who might have a favorable result.