TNF (308A) polymorphism is associated with microchimerism in transfused trauma patients (P = .02). Polymorphism frequency of (A) TNF (−308A), (B) IL 10 (−1082G), (C) TGFB1 (+915G), and (D) IFNG (+874T) SNPs. Dark bars represent transfused trauma patients who were classified as MC positive (n = 30), and light bars represent transfused trauma patients who were classified as MC negative (n = 29). Two-sided Fisher exact test was used. Panel A includes an inset table depicting the relevant raw data for TNF (308) polymorphism.