Abstract
TGF-beta signaling is frequently perturbed in many human cancers, including renal cell carcinomas (RCCs) and transitional cell carcinomas (TCCs) of the bladder. Genetic alterations of the TGF-beta type 1 receptor (TGFBR1) may contribute to these perturbations. We therefore examined variations in the TGFBR1 gene by PCR, SSCP and RFLP in carcinomas of the urinary system and in tissues from noncancer, age-matched controls. A G-->A variant 24 bp downstream of the exon/intron 7 boundary of the TGFBR1 gene (Int7G24A) was evident in patients with RCC (46.5%, n = 86) and bladder and upper urinary tract TCC (49.2%, n = 65) significantly more frequently than in age-matched controls (28.3%, n = 113, p < 0.002 by chi2 test). Moreover, 8 homozygous variant carriers were found in the cancer groups, whereas not a single homozygous variant carrier was found in the control group. The Int7G24A allele (both heterozygous G/A and homozygous A/A carriers) was associated with increased RCC incidence (OR = 2.20, 95% CI 1.22-3.96) and TCC incidence (OR = 2.45, 95% CI 1.89-3.16). One somatic mutation of serine to phenylalanine at codon 57 of the TGFBR1 gene was confirmed in an upper urinary tract TCC. In conclusion, the Int7G24A variant in the TGFBR1 ge...Continue Reading
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