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Abstract

Volume 17, Issue 6 (November 2015) 17, 904–907; 10.4103/1008-682X.153543

Relapse of prostate cancer from the viewpoint of total gland volume kinetics theory

Hiroki Watanabe

Director, Watanabe Memorial Choumei Research Laboratory, Shiga; Honorary Professor, Kyoto Prefectural University of Medicine and Meiji University of Integrated Medicine, Kyoto, Japan

Correspondence: Prof. H Watanabe

30-Jun-2015

Abstract

In many cases of prostate cancer, changes of prostate volume were measured very frequently after castration by means of transrectal ultrasound. For short-term observations, a factor called as "reduction time (tau [τ])," which means the time required for the volume of "effective portion" (volume responded to castration) to be reduced to one-tenth of its original value, correlated very well with patients' prognosis. For long-term observations for relapse, changes of prostate volume could be divided clearly into two types, namely, "metastatic progressive type" with metastasis without volume increase and "local progressive type" with remarkable volume increase without metastasis. "τ" in the "local progressive type" was far shorter than that in the "metastatic progressive type." Much longer survival was obtained when the patient belonged to the "local progressive type," than to the "metastatic progressive type." Thus, "τ" was the most important and the most reliable factor to predict the prognosis. Based upon these observations, a schematic analysis of prostate cancer relapse was shown.

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