Leung L, et al. - The association between shift work exposure and epithelial ovarian cancer (EOC) risk was examined in this population-based case–control study including 496 EOC cases and 906 controls. With increasing years of shift work, no clear pattern of increasing EOC risk was found; 1.20 was the adjusted OR of EOC comparing the highest shift work category vs never working shift work. Those who self-identified as having a “morning” chronotype exhibited a more pronounced link. By menopausal status, no great differences were seen in the associations. A link between shift work and EOC risk was not strongly shown in this study.