FANCB and myelodysplastic syndrome with excess blasts: Furthermore, patients with RAEB according to FAB (n = 63) (HR 0.57), CMML (n = 8, HR 0.45), and RA (n = 8, HR 0.42) lived longer than patients with AML according to FAB, although this difference achieved statistical significance only for RAEB, possibly due to different sample sizes.