Other significant variances among the studies were the AFP initiation (beginning of conditioning [83], the day of transplant [84,85], the day after transplant [82], the day of GVHD onset [80]) and the incidence of an a-GVHD grade ≥ two (100% [80], 64% [83], 46% [85], 41% [84] and 37% [82]). The gene discussed is AFP; the disease is graft versus host disease.