Pana et al.36 found associations of certain FCN2 haplotypes [corresponding to promoter polymorphisms at positions: − 986 (A > G), − 602 (G > A), − 4 (A > G) and exon 8 polymorphisms at positions: + 6,359 (C > T), + 6,424 (G > T)] with bacterial infections and duration of febrile neutropenia in children diagnosed with B-cell ALL, after chemotherapy. The gene discussed is FCN2; the disease is bacterial infectious disease.