Multicancer detection: diagnostic conversion is part of the evidence base

Agreement: I Agree Body: Dear Editor Batson and colleagues provide a clear and important statement on the evidence required before multicancer detection tests can be considered for screening programmes.1 Their emphasis on defining the use case, diagnostic work-up, unresolved positive results, harms, cost-effectiveness and feasibility is particularly welcome. One further operational point deserves emphasis. For multicancer detection, the diagnostic pathway after a positive result is not downstrea