The Cancer Awareness Measure (CAM) was developed in 2007-8 to address the absence of a validated measure of general public awareness of cancer (Stubbings, S., Robb, K., Waller, J., Ramirez, A., Austoker, J., Macleod, U., Hion, S., and Wardle, J. (2009) 'Development of a measurement tool to assess public awareness of cancer', British Journal of Cancer, 101(2), S13-S17.).The survey includes measures of awareness of signs and symptoms of cancer, cancer risk factors, age-related risk, screening programmes and potential barriers to seeing the GP. Since then, Cancer Research UK (CRUK) has significantly revised and updated the survey, including a wider range of questions and collecting data online instead of face-to-face. The CAM was also previously known as the National Awareness and Early Diagnosis Initiative Cancer Awareness Measure (NAEDI-CAM). CAM data have been collected by CRUK approximately every two years from 2008 to 2019, moving to bi-annual in 2021. The COVID-specific CAM was developed in 2020 and 2021 to measure the longitudinal impact of the COVID-19 pandemic on cancer attitudes and behaviour and to understand the contextual influences on cancer attitudes and behaviour during the COVID-19 pandemic.Further information about the CAM may be found on the Cancer Research UK Cancer Awareness Measures (CAMs) webpage.For the second edition (February 2025), the data file has been updated with two new ethnicity variables. The CAM questionnaire addressed the following topics: public awareness of cancer symptomspublic knowledge of cancer risk factorsreasons for patient delay before contacting doctor public knowledge of common cancer types in men and womenpublic awareness of cancer screening programmesdemographic variables