Engraftment
Platelet engraftment was observed at a median 16 days after allogeneic HSCT. Platelet engraftment occurred in 38 patients in the ABO-matched group (range, 14.3–18.1 days), 43 cases in the major incompatibility group (range, 13.1–19.3 days), 21 patients in the minor incompatibility group (range, 13.9–19.3 days), and nine patients in the bidirectional incompatibility group (range, 11.9–16.8 days) (P = 0.698). The cumulative incidences of 100-day platelet engraftment were 97.37%, 100%, 90.48%, and 100% for the respective groups (P = 0.3451). Only one case of neutrophil engraftment failure was observed in the ABO-matched group, while the rest were successfully engrafted.