Furthermore, our study confirms that TCD is associated with a low incidence of severe acute and chronic GVHD, with a day 100 cumulative incidence of grade III–IV aGVHD of 6.2% and 1.3% and a 1-year cumulative incidence of extensive cGVHD of 11.3% and 2.5% in the ATG and the CD34+ groups, respectively. Here, CD34 is linked to chronic graft versus host disease.