Risk factors for invasive fungal infection in 5-azacytidine treated patients with acute myeloid leukemia and myelodysplastic syndrome.

The rate of invasive fungal infection (IFI) in patients with myelodysplasia (MDS) and acute myeloid leukaemia (AML) receiving 5-azacytidine is incompletely defined and published recommendations for mold-active fungal prophylaxis in such patients vary according to source. We performed a retrospective cohort study in order to identify contemporary IFI rates and infection-related mortality in relation to known risk factors and the use of anti-fungal prophylaxis. One-hundred seventeen patients receiving 5-azacytidine for MDS and low blast count AML were identified, of whom 71 (61%) received antifungal prophylaxis. The IFI rate was 7.7% across the entire cohort: 5.6% in those receiving prophylaxis vs. 10.9% in the subgroup who did not (p=0.30). The presence of neutropenia at three months of treatment was associated with increased IFI risk (hazard ratio [HR] 8.29; (95% confidence interval [CI)] 1.61-42.6; p=0.01) and on multivariate analysis, IFI was independently associated with increased all-cause mortality risk (HR 8.37; 95% CI 3.67 - 19.11; p<0.0001). These data further highlight the risk of IFI in this population and support the use of mold-active prophylaxis in neutropenic patients receiving 5-azacytidine for MDS and AML.