Cancer incidence has been rising in Europe, with notable disparities between Western and Eastern countries due to differences in risk factors like smoking. Cancer Primary Prevention seeks to address these modifiable factors, requiring collaboration across various societal sectors. This deliverable, using surveys and interviews with 110 CPP stakeholders across nine countries, found that while the public sector is seen as the primary driver of change, Eastern Europe places more emphasis on other sectors due to public sector inadequacies. Key roles were identified for different stakeholders: the public sector provides healthcare and strategy, academia contributes credible research, the private sector offers resources but is profit-driven, media disseminates information, and civil society advocates for change. The study underscores the need for cross-sector collaboration to maximize CPP effectiveness.