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American Journal of Pathology, Vol 149, 1435-1440, Copyright © 1996 by American Society for Investigative Pathology

REGULAR ARTICLES

Expression of the KAI1 protein in benign prostatic hyperplasia and prostate cancer

T Ueda, T Ichikawa, J Tamaru, A Mikata, K Akakura, S Akimoto, T Imai, O Yoshie, T Shiraishi, R Yatani, H Ito and J Shimazaki
Department of Urology, Chiba University School of Medicine, Japan.

The KAI1 gene, recently identified as a metastatic suppressor gene for prostate cancer, was cloned and was revealed to be identical to the C33/IA4/ R2/4R9 gene. The expression of KAI1 protein was examined immunohistochemically in the tissues from 14 cases of benign prostatic hyperplasia and 46 cases of prostate cancer using mouse monoclonal anti- human C33 antibody. In benign prostatic hyperplasia tissues, KAI1 protein was uniformly expressed in the glandular cell membrane at cell- to-cell borders. The KAI1 protein in the tissues of untreated prostate cancer was also located at similar sites to those of benign prostatic hyperplasia, but the percentage of strongly positive cancer cells was correlated inversely to the Gleason pattern (P < 0.0001, one-way analysis of variance). There was also a statistically inverse correlation between the percentage of KAI1-positive cancer cells and the clinical stage (chi 2 = 9.6; P = 0.0081). In 4 cancer death cases relapsed from endocrine therapy, KAI1 protein was not stained in either primary or metastatic foci. These results indicate that the expression of KAI1 protein correlates to tumor characteristics in prostate cancer.

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