Ohe H, Watanabe H
Department of Urology, Kyoto Prefectural University of Medicine, Japan.
Cancer. 1988 Dec 1;62(11):2325-9. doi: 10.1002/1097-0142(19881201)62:11<2325::aid-cncr2820621112>3.0.co;2-s.
Prostatic volume in patients with prostatic cancer diminished remarkably after castration according to measurements by transrectal sonography. These kinetic changes in prostatic volume were analyzed and a formula was applied to the regression curve. The reduction time (tau) in the formula, which is a constant representing the time interval required for the effective portion of the prostate to be reduced to one tenth, was thought to be a good index to predict the prognosis of the patients.
