In their evaluation of 62 patients undergoing haploidentical HSCT from G-CSF-primed BM plus G-CSF-mobilized PBSCs, Lv et al.71 performed a multivariate analysis that showed an inverse correlation between the absolute number of P-MDSCs or M-MDSCs, but not G-MDSCs, infused and the occurrence of grade II–IV aGVHD and extensive chronic GVHD (cGVHD). Here, CSF3 is linked to chronic graft versus host disease.