TNF and juvenile polyposis syndrome: Statistical power of the present study to detect a difference in minor allele frequency between the groups of TJA patients with / without PJI corresponding to odds ratio (OR) = 2 reached 98% for IL1B-511, 97% for IL1B + 3962, 94% for TNF-308, 61% for TNF-238, and 99% for both IL6–174 and IL6 nt565 SNPs.