PDGFRA and irritable bowel syndrome: The differences in the frequencies of genotypes for the SNP rs3138045 (NFKB1A) were observed between SLO and IBS and GBR and IBS, while the frequencies of genotypes rs7656613 (PDGFRA), rs909253 (LTA), and rs2857602 (LTA) differ between populations of SLO and CEU and SLO and GBR.