The Cancer Screening in Five Continents (CanScreen5) project of the International Agency for Research on Cancer (IARC) aims to collect information on the characteristics and performance of cancer screening programmes across the globe in a harmonized manner and to disseminate the information for improved programme management and informed policy-making. The core objective of CanScreen5 is to encourage and support countries to collect and use cancer screening data for effective programme evaluation and quality improvement. The CanScreen5 website is a global repository of information on cancer screening programmes.