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[Correspondence] Hormone therapy and ovarian cancer

The epidemiological study by the Collaborative Group on Epidemiological Studies of Ovarian Cancer,1 hoped to inform regulatory bodies on the association between hormone therapy use and ovarian cancer, citing that at present, the WHO, European, and US guidelines are mute on this matter, and UK guidelines only state that risk may be increased with long-term use, and that the UK guidelines are set to be reviewed.