IL1B and colorectal carcinoma: Low risk of CRC was found for the IL1B C-3737T variant allele carriers among non-NSAID users (IRR=0.74, 95% CI: 0.60-0.91) but not among NSAID users (IRR=0.82, 95% CI: 0.64-1.06) compared to the homozygous wildtype carriers (reference) (Pint=0.04).