CD8A and post-transplant lymphoproliferative disease: Although our data shows a statistically significant difference in CD8+ T cell absolute counts between the ATG group and the non ATG group on day 15, there is no statistically significant difference in CD8+ T cell absolute count on day 30 between the two groups (Z = −0.018, P = 0.986), indicating that the use of ATG before the occurrence of PTLD has no significant effect on CD8+ T cell reconstruction.