Cancer Incidence in Five Continents (CI5) is a longstanding collaboration between the International Agency for Research on Cancer and the International Association of Cancer Registries. The series of volumes, published every five years, is a key source of information on the changing patterns of cancer incidence worldwide. The CI5 databases provide access to detailed information on the incidence of cancer recorded by population-based cancer registries (subnational or national).

This website is being transitioned to a new repurposed IACR website which will have dedicated online tools (CI5++) for the geographic and temporal analysis of individual registry datasets included over the 12 volumes of CI5.