Summary
In tissue biopsies and resection material (TUR) of the prostate a high coincidence (49.4%) was found between atypical primary hyperplasia with atypical-dysplastic microglandular, adenomatous and cribriform structures on the one hand and carcinomas on the other. The frequency of atypical hyperplasia in prostatic tissue without carcinoma was 2.8%. Microglandular pattern predominates in atypical hyperplasia combined with differentiated adenocarcinomas. A high coincidence between cribriformly structured glands of atypical primary hyperplasia and solid anaplastic — cribriform carcinomas can be observed.
Autoradiographically the labeling index of atypical hyperplasia was three times as high as that of simple hyperplasia. The mean labeling index of atypical hyperplasia, however, was similar to that of poorly differentiated adenocarcinomas and cribriform carcinomas. The similar proliferation pattern of atypical hyperplasia and carcinomas as well as the high coincidence between both indicate that severe atypical primary hyperplasia is a precancerous lesion.
Therefore, those patients with primary atypical hyperplasia with distinct cellular and structural atypia but without manifest carcinomas in prostatic biopsy or resection material should be followed up at short intervals.
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Supported by Landesamt für Forschung, Minister für Wissenschaft und Forschung des Landes Nordrhein-Westfalen, Düsseldorf
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Helpap, B. The biological significance of atypical hyperplasia of the prostate. Virchows Arch. A Path. Anat. and Histol. 387, 307–317 (1980). https://doi.org/10.1007/BF00454834
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DOI: https://doi.org/10.1007/BF00454834