We postulated that TAP genes may influence the susceptibility of some individuals to Echinococcus multilocularis infection. Six coding region variants (codons 333 and 637 in TAP1, and 379, 565, 651 and 665 in TAP2) were typed in 94 patients and 100 controls. Thr/Thr homozygosity at TAP2/665 was more prevalent in patients than in controls [64% vs. 45%, respectively; odds ratio (OR) = 2.1 (95% confidence interval (CI) 1.1; 2.7)] and Thr/Ala heterozygozity was less prevalent (32% vs. 50%, respectively) (P = 0.014). Of the 38 patients with progressive lesions, 76% were Thr/Thr, as compared with 55% of patients without progressive lesions and 45% of controls (P = 0.058 and 0.02, respectively), independent of HLA status. To determine whether this association is functionally relevant, functional analyses and/or confirmation in distinct populations of patients with alveolar echinococcosis would be required.
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