On the basis of animal studies, IARC added exposure to ultraviolet radiation to the Group 1 list, and exposure to solar radiation was reaffirmed as carcinogenic, according to the authors.

• 作者指出，根据动物研究结果，IARC将紫外线辐射暴露归到1组致癌物，并再次申明日光辐射是致癌物。