What is the primary role of the International Agency for Research on Cancer (IARC) regarding carcinogens?

The primary role of the International Agency for Research on Cancer (IARC) is to classify carcinogenic risks. This means that the IARC is responsible for evaluating evidence related to substances and exposures that may cause cancer in humans, categorizing them based on their level of risk. The classifications provided by the IARC help guide public health policies, regulatory actions, and empirical research efforts addressing cancer prevention.

In terms of the other options, the IARC does not treat cancer patients or develop cancer vaccines. These activities fall under the purview of clinical and pharmaceutical organizations, respectively. Additionally, while funding cancer research can be an activity for various organizations, IARC primarily focuses on the assessment and classification of carcinogenic risks rather than directly funding research projects.