Identifying BAC clones for diagnosis of conventional renal cell carcinoma by FISH.
OBJECTIVE
The new classification of renal cell tumours relies on tumour-specific genetic alterations, which can be detected by different techniques. For diagnosis of conventional renal cell carcinoma by FISH we have isolated BAC clones from the chromosomal regions of interest.


RESULTS
A BAC library was screened by microsatellites mapped to the smallest overlapping regions of loss of heterozygosity (LOH) at chromosomes 3p, 5q, 6q, 8p, 9p and 14q. Positive BACs were tested by carrying out FISH in normal cells for signal/noise ratio. Subsequently, 11 conventional and two papillary renal cell carcinomas were analysed by the new diagnostic BAC set and the results were compared with those obtained by microsatellite allelotyping. The diagnostic value of FISH was comparable to that of microsatellite analysis in nearly all tumours except those with extreme chromosomal polyploidization.


CONCLUSIONS
We conclude that both FISH and microsatellite analyses are helpful to strengthen the diagnosis of conventional renal cell carcinoma. However, both techniques may have some disadvantage in a special setting.
Heinze
F
F
Laboratory of Molecular Oncology, Department of Urology, Ruprecht-Karls University, Heidelberg, Germany.
Kovacs
G
G
D002292:Carcinoma, Renal Cell / Q000175:diagnosis* / Q000235:genetics*; D022202:Chromosomes, Artificial, Bacterial / Q000235:genetics*; D002999:Clone Cells; D015723:Gene Library; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007680:Kidney Neoplasms / Q000175:diagnosis* / Q000235:genetics*; D019656:Loss of Heterozygosity; D018895:Microsatellite Repeats