The US National Toxicology Program (NTP) has issued its 15th Report on Carcinogens (RoC), adding eight new substances; NTP now identifies 256 chemical, physical, and biological agents; mixtures; and exposure circumstances as “known or reasonably anticipated to cause cancer in humans.” NTP operates within the National Institute of Environmental Health Sciences (NIEHS), which is a unit of the National Institutes of Health (NIH). It was established in 1978 to:
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