About 66.9% of myeloid blasts were found in pleural effusion, and the immunophenotype was positive for CD34, CD117, CD33, CD64, HLA-DR, a small amount of cytoplasmic MPO, and partially positive for CD56 (Fig. S1; http://links.lww.com/MD/H835). The gene discussed is NCAM1; the disease is Pleural effusion.