Localization of a tumor suppressor gene associated with progression of human prostate cancer within a 1.2 Mb region of 8p22-p21.3

✍ Scribed by Hiroyoshi Suzuki; Miburu Emi; Akira Komiya; Yoshiyuki Fujiwara; Ryuichi Yatani; Yusuke Nakamura; Jun Shimazaki

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 529 KB
• Volume: 13
• Category: Article
• ISSN: 1045-2257
• DOI: 10.1002/gcc.2870130306

✦ Synopsis

Human prostate cancers frequently show loss of heterozygosity at loci on the short arm of chromosome 8. In order t o take a step toward isolation of the putative tumor suppressor gene(s) on 8p via positional cloning, we performed high-resolution deletion mapping in 46 prostate cancers (stage B, 20 cases; stage C, 8 cases; endocrine therapy-resistant cancer death, I 8 cases) using new I 2 restriction fragment length polymorphism markers for this chromosomal region. Allelic losses were observed in 25 of the 44 cases (57%) that were informative with at least one locus. Detailed deletion mapping defined a I .2 Mb commonly deleted region at 8p22-p2 I .3 flanked by markers cMSR-32 and C18-I05 I. A second region of common deletion was identified between C18-I 3 I 2 and C18-494 at 8p2 I -8p I I .22, suggesting that at least two tumor suppressor genes associated with prostate cancer are present on chromosome arm 8p. Allelic losses on 8p were observed more frequently in the cancer death cases (I 4/ 17, 82%) than in early-stage tumors ( I 1/27, 40%; P < 0.0 I, Fisher's exact test). In two out of 7 patients for whom D N A was available from metastatic cancers as well as from normal tissues and primary tumors, the primary cancer foci had no detectable abnormality of 8p, but the metastatic tumors showed loss of heterozygosity. These results suggest that inactivation of tumor suppressor genes on 8p plays an important role in the progression of prostate cancer. Genes Chrornosorn Cancer . . .