For example, in FA, revertant mosaicism in the blood may improve overall blood counts (47, 140), but still confers a risk for leukemogenesis (141), while in the rare single cases of reversion in GATA2 deficiency (64) and RUNX1-FPD (66), hematologic malignancies have not been reported. The gene discussed is GATA2; the disease is hematologic disorder.