First-line therapy for higher-risk myelodysplastic syndromes (MDS) includes decitabine (DAC) or azacitidine (AZA). Variables have not identified differential response rates between these. We assessed the influence of patient sex on outcomes including overall survival (OS) in 642 patients with higher-risk MDS treated with AZA or DAC. DAC-treated patients (35% of females, 31% of males) had marginally better OS than AZA-treated patients (p = .043), (median OS of 18.7 months versus 16.4 months), but the difference varied strongly by sex. Female patients treated with DAC had a longer median OS (21.1 months, 95% CI: 16.0-28.0) than female patients treated with AZA (13.2 months, 95% CI: 11.0-15.9; p = .0014), while for males there was no significant difference between HMAs (median OS 18.3 months with DAC versus 17.9 months for AZA, p = .59). The biological reason for this variability is unclear, but may be a consequence of differences in cytidine deaminase activity between men and women.
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| http://dx.doi.org/10.1080/10428194.2016.1246726 | DOI Listing |
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