Aberrations of the long arm of chromosome 5 (5q) were studied in 79 clear cell renal carcinomas (clear cell RCC) by LOH (loss of heterozygosity) method, using microsatellite markers D5S107, CRTL1, LNS-CA, IL-9.RP1, CFS1R and GeneScan analysis software. Alterations of chromosome 5q were detected in 42% of cases. We found, that accumulation of genomic abnormalities at multiple loci of 5q, especially in 5q21-qter region, where genes for cytokines are located, correlates with morphologic features of better prognosis.