The results of the 2015 Cancer Barometer confirm those of previous editions and show that certain socioeconomic groups deserve special attention to address the information gap. - The majority of French people appear to be well-informed about the impact of lifestyle habits on health. The information gap primarily concerns natural environmental risk factors and physical and infectious agents. - Fewer than one in ten people cite prevention campaigns as a source of information. - Television is no longer the dominant medium but remains the primary source for disadvantaged socioeconomic groups. It appears necessary to improve knowledge of warning signs, especially among the most disadvantaged. - Nine out of ten people agree with the idea that many cancers can be cured today. - Nearly all people who have experienced this disease personally or among their loved ones are satisfied with the care provided.