Understaging and undergrading of prostate cancer. Argument for postoperative radiation as adjuvant therapy.

This report reviews the staging and grading errors that occurred in a consecutive series of 14 patients treated for prostate cancer by radical prostatectomy and of 58 patients treated by both radical prostatectomy and pelvic lymphadenectomy. Almost half of the patients who were in Stages A2, B1, or B2 by clinical criteria were in pathologic Stage C when both capsular perforation and seminal vesicle invasion were used as the criteria for Stage C disease. Seminal vesicle invasion was the more important prognostic factor. Moreover, the pathologic grade of cancer, as determined by needle or transurethral biopsy, was underestimated in 39 per cent of the cases; when the grade was corrected, the patient often was in a worse prognostic group than the one originally assigned. Thus, in this series, more than 40 per cent of the patients were at high risk of persistent or recurrent disease after radical prostatectomy. Radiation was given after operation to 22 such high-risk patients and was well tolerated.