Exposure To Nighttime Artificial Lights Linked To Elevated T
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Some breast cancers may share a common hormone-dependent basis with thyroid cancer. Researchers looked for an association between light at night and later development of thyroid cancer among participants in the NIH-AARP Diet and Health Study. Researchers analyzed satellite imagery data to estimate levels of night light at participants' residential addresses. They examined state cancer registry databases to identify thyroid cancer diagnoses.

The highest quintile of light at night was associated with a 55 percent higher risk of developing thyroid cancer. The association was primarily driven by the most common form of thyroid cancer, called papillary thyroid cancer and was stronger in women than in men. The study involved 464,371 participants who were followed for an average of 12.8 years.

The researchers noted that additional epidemiologic studies are needed to confirm their findings. If confirmed, it will be important to understand the mechanisms underlying the relationship. Light at night suppresses melatonin, a modulator of estrogen activity that may have anti-tumor effects.

"As an observational study, our study is not designed to establish causality," says a researcher. "We hope our study will motivate researchers to further examine the relationship between light at night and cancer, and other diseases," he says.

Source:
https://acsjournals.onlinelibrary.wiley.com/doi/10.1002/cncr.33392
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