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Identification and Fine Mapping of a Region Showing a High Frequency of Allelic Imbalance on Chromosome 16q23.2 That Corresponds to a Prostate Cancer Susceptibility Locus¹

Departments of Cancer Biology [P. L. P., G. C.], Radiation Oncology [P. A. K.], Anatomic Pathology [H. L.], and Urology [E. A. K.], Cleveland Clinic Foundation, Cleveland, Ohio 44195; Department of Epidemiology and Biostatistics, Case Western Reserve University, Cleveland, Ohio 44106 [J. S. W.]; and Department of Urologic Surgery, Washington University, St. Louis, Missouri 63110 [W. J. C.]

Linkage to a prostate cancer susceptibility locus was recently reported on chromosome 16q23. We now report a region exhibiting a high frequency of allelic imbalance (AI) corresponding to this locus in tumors from 51 men diagnosed with prostate cancer using the same linked markers. The highest frequency of AI was found at markers D16S3096(45%) and D16S516 (53%) that map to chromosome 16q23.2. In addition, 19 of the 51 (37%) prostate tumors showed interstitial AI involving one or both of these markers. This result strongly suggests that a candidate prostate cancer tumor suppressor gene maps between markers D16S3096 and D16S516. We estimate that the distance between these markers is approximately 118 kb using a Stanford radiation hybrid panel. We observed a positive association with family history (P = 0.048) when comparing those men showing interstitial AI at markers D16S3096 and/or D16S516 with those without any imbalance at these two markers. Taken together, these data suggest that we have precisely localized a region of chromosome 16q23.2 that may harbor a prostate cancer tumor suppressor gene implicated in the development of non-familial and possibly familial forms of prostate cancer.

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