Links between genetic and environmental factors and prostate cancer risk
Corresponding Author
Peter Ekman
Department of Urology, Karolinska Hospital, Stockholm, Sweden
Department of Urology, Karolinska Hospital, S-171 76 Stockholm, SwedenSearch for more papers by this authorHenrik Grönberg
Department of Oncology, Umeå University Hospital, Umeå, Sweden
Search for more papers by this authorHideyasu Matsuyama
Department of Urology, Yamaguchi Red Cross Hospital, Yamaguchi, Japan
Search for more papers by this authorMerja Kivineva
Department of Anatomy, Medical School, University of Tampere, Tampere, Finland
Search for more papers by this authorUlf S.R. Bergerheim
Department of Urology, Karolinska Hospital, Stockholm, Sweden
Search for more papers by this authorChunde Li
Department of Urology, Karolinska Hospital, Stockholm, Sweden
Search for more papers by this authorCorresponding Author
Peter Ekman
Department of Urology, Karolinska Hospital, Stockholm, Sweden
Department of Urology, Karolinska Hospital, S-171 76 Stockholm, SwedenSearch for more papers by this authorHenrik Grönberg
Department of Oncology, Umeå University Hospital, Umeå, Sweden
Search for more papers by this authorHideyasu Matsuyama
Department of Urology, Yamaguchi Red Cross Hospital, Yamaguchi, Japan
Search for more papers by this authorMerja Kivineva
Department of Anatomy, Medical School, University of Tampere, Tampere, Finland
Search for more papers by this authorUlf S.R. Bergerheim
Department of Urology, Karolinska Hospital, Stockholm, Sweden
Search for more papers by this authorChunde Li
Department of Urology, Karolinska Hospital, Stockholm, Sweden
Search for more papers by this authorAbstract
BACKGROUND
Genetic polymorphisms and expression of steroid receptors may explain why some individuals are more at risk of developing prostate cancer. Some risk factors often discussed are androgen stimulation, and vitamin A and D deficiency. Long CAG-repeats in exon 1 of the androgen receptor (AR) gene on the X chromosome seem to have a protective role against androgen overstimulation. Likewise, long vitamin D receptor alleles in the poly-A tract may prevent vitamin D stimulation.
METHODS
Blood samples from 59 Swedish patients with sporadic prostate cancers, 59 with hereditary prostate cancer, and 34 Japanese prostate cancer patients were compared with benign controls. Tissue specimens from 37 Swedish and 23 Japanese prostate cancer patients with matching blood samples were investigated by immunohistochemical techniques.
RESULTS
The number of CAG-repeats was identical in sporadic and hereditary prostate cancer patients, but the repeats were significantly shorter than in benign controls. Benign Japanese controls were similar to Swedish controls, but Japanese prostate cancers had longer repeats than did controls. Both the vitamin D and A receptor staining was stronger in Japanese than in Swedish prostate cancer specimens. Prostate cancer occurs approximately 5 years later in Japanese compared with Swedish men.
CONCLUSIONS
Varying lengths of CAG-repeats of the androgen receptor cannot fully explain racial differences in clinical prostate cancer incidence. A larger content of vitamin A and D receptors may be linked to a delayed onset of clinical prostate cancer in Japanese men. Prostate 39:262–268, 1999. © 1999 Wiley-Liss, Inc.
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