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Interferon (IFN) signaling has been suggested to play an important role in colorectal carcinogenesis. Our study aimed to examine potentially functional genetic variants in interferon regulatory factor 3 ( IRF3 ),  IRF5 ,  IRF7 , type I and type II  IFN  and their receptor genes with respect to colorectal cancer (CRC) risk and clinical outcome. Altogether 74 single nucleotide polymorphisms (SNPs) were covered by the 34 SNPs genotyped in a hospital-based case-control study of 1327 CRC cases and 758 healthy controls from the Czech Republic. We also analyzed these SNPs in relation to overall survival and event-free survival in a subgroup of 483 patients. Seven SNPs in  IFNA1 ,  IFNA13 ,  IFNA21 ,  IFNK ,  IFNAR1  and  IFNGR1  were associated with CRC risk. After multiple testing correction, the associations with the SNPs rs2856968 ( IFNAR1 ) and rs2234711 ( IFNGR1 ) remained formally significant ( P  = 0.0015 and  P <0.0001, respectively). Multivariable survival analyses showed that the SNP rs6475526 ( IFNA7/IFNA14 ) was associated with overall survival of the patients ( P  = 0.041 and event-free survival among patients without distant metastasis at the time of diagnosis,  P  = 0.034). The hazard ratios (HRs) for rs6475526 remained statistically significant even after adjustment for age, gender, grade and stage ( P  = 0.029 and  P  = 0.036, respectively), suggesting that rs6475526 is an independent prognostic marker for CRC. Our data suggest that genetic variation in the IFN signaling pathway genes may play a role in the etiology and survival of CRC and further studies are warranted.

Single Nucleotide Polymorphisms within Interferon Signaling Pathway Genes Are Associated with Colorectal Cancer Susceptibility and Survival