TNFRSF14 and graft versus host disease: Contrarily, del Rio et al.90suggested that blocking BTLA/HVEM pathway is insufficient to inhibit the infiltration and allo‐reaction of donor T cells to GVHD susceptible tissues. Figuring out the exact effect of blocking the BTLA pathway on GVL and GVHD needs more investigations and an extended follow‐up period.