TNFRSF1A and post-transplant lymphoproliferative disease: Similar analysis of the TNFRI promoter position −1135 resulted in an observed decrease in the frequency of the genotype −1135TT (4% vs 17%) and an increase in the frequency of genotype −1135CC (47% vs 31%) within the PTLD group compared with the transplant control group, however, this did not reach significance (P=0.06; Table 2).