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Department of Laboratory Medicine and Pathology, Mayo Clinic. Rochester, Minnesota 55905
Although prostate cancer is one of the most common malignancies of males in Western countries, relatively little is known about the molecular mechanisms involved in tumor initiation and progression. Allelic loss studies have suggested the involvement of multiple tumor suppressor genes (TSGs), but few detailed studies of all chromosomes have been performed. In an effort to localize and identify candidate TSGs, we performed allelic imbalance (AI) studies on 55 prostate cancers, using 135 polymorphic microsatellite markers. For the entire chromosome, AI ranged from a low of 0% on chromosomes 14 and 20 to a high of 71% on chromosome 8. Chromosomal regions demonstrating at least twice the background frequency of AI (ranging from 20 to 69%) included 5q, 6q, 7q, ip, 13, 16q, 18q, and 21. In addition, AI was examined for association with a number of clinicopathological parameters. AI on chromosomes 7 and 16 were each associated with greater age at diagnosis (P = 0.009 and 0.001, respectively), and AI on chromosomes 10, 16, and 18 was associated with aneuploidy/tetraploidy (P = 0.037, 0.013, and 0.054, respectively). Furthermore, AI on chromosome 5 was associated with a higher pathological stage (P = 0.021) and on chromosome 8 and 16 with a higher Gleason score (P = 0.027 and 0.041, respectively). No tumor exhibited a phenotype of widespread microsatellite instability. These results indicate that there likely exist multiple sites harboring candidate TSG in prostate cancer, some of which may have important clinical implications, and which argue against widespread microsatellite instability.
1 This work was supported by Prostate Spore, NIH P20 CA 58225.
2 J. M. C. and A. S. contributed equally to this study.
3 To whom requests for reprints should be addressed. Phone: (507) 284–4696; Fax: (507) 284-0043.
Received 4/10/96. Accepted 7/26/96.
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