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Deletion of Chromosome 3p14.2-p25 Involving the VHL and FHIT Genes in Conventional Renal Cell Carcinoma¹

Laboratory of Molecular Oncology, Department of Urology, Ruprecht-Karls-University, D-69120 Heidelberg, Germany [F. S., N. K., A. P. K., G. K.]; Department of Pathology, University of Szeged, 6701 Szeged, Hungary [F. S.]; and Department of Urology, University of Pecs, 7643 Pecs, Hungary [T. B.]

Loss of heterozygosity (LOH) at chromosome 3p and inactivation of the VHL gene are associated with the development of conventional renal cell carcinomas (RCCs). Recently, it was suggested that LOH at the FHIT gene at 3p14.2 is an early event in the development of RCC and is characteristic for all types of RCC. We have analyzed 88 conventional, 30 papillary, and 22 chromophobe RCCs for LOH at the VHL and FHIT regions and at other loci on chromosome 3p. A continuous deletion of 3p14.2-p25 harboring the VHL and FHIT genes occurred in 96% of the conventional RCCs but only in 10% of the papillary RCCs and 18% of the chromophobe RCCs. Our data indicate that LOH at chromosome 3p14.2-p25 is specific for conventional RCC and that loss of one allele of both the VHL and FHIT genes occurs in early stage of tumorigenesis.

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