Table 2.

Overview of the expert video presentations.

Title	Presenter	Content of presentation
1. What is screening and what are the potential benefits and harms	General Practitioner and Professor of General Practice	Definition of screening Potential benefits of screening (including prevention, earlier effective treatment and reassurance) Potential harms of screening (including overdiagnosis, overtreatment and anxiety) Most individuals do not derive significant personal benefits from screening
2. Ethical considerations around screening and determining eligibility	Associate Professor of Philosophy of Public Health	Introduction of core principles in medical ethics (do good, do not do harm, treat people fairly and respect choices) How these principles apply to screening The need to balance them when they conflict
3. How is eligibility for screening currently determined and what is risk stratification	Senior Policy Analyst	Current cancer screening programmes invite people of certain ages In stratified screening, the invitation to screening is based on estimated risk Risk can be determined using personal factors including age, sex, BMI, diet and exercise, genetics and so forth
4. The potential effects of introducing risk stratification	Researcher in Primary Care Research	Described a series of scenarios of different strategies for inviting people to screening for a common and uncommon cancer Data were based on a population of 100,000 people aged 40–70 years, modelled on the UK Biobank cohort Reported how outcomes (including number screened and true/false positives) might be different for men and women and older and younger people

Abbreviation: BMI, body mass index.