Exposure to Artificial Lights Linked to Raised Thyroid Cancer Risk by Angela Mohan on February 8, 2021 at 3:15 PM CANCER, a peer-reviewed journal of the American Cancer Society. Over the past century, nightscapes--especially in cities--have drastically changed due to the rapid growth of electric lighting. Also, epidemiological studies have reported an association between higher satellite-measured levels of nighttime light and elevated breast cancer risk. Because some breast cancers may share a common hormone-dependent basis with thyroid cancer, a team led by Qian Xiao, PhD...