Reply to Associations between light at night and risk of thyroid cancer

We thank Xiao et al for their interest in our study1 and the relevant points that they raise in their letter. We agree that because of the potential role of circadian disruption in thyroid cancer etiology, night-shift work could influence the risk of thyroid cancer. Because night-shift work increases exposure to light at night (LAN), it may have an impact on the association between LAN and thyroid cancer. However, the NIH-AARP Diet and Health...