{"entity":{"id":"idea-mced-plus-fapi","kind":"idea","name":"FAPI PET as the workup for MCED positives","aka":[],"tldr":"When a blood test says 'cancer signal, origin unclear', a FAPI PET scan may find it where FDG cannot.","summary":"When a blood test reports a cancer signal of unclear origin, this idea sends the patient for FAPI PET/CT rather than FDG PET as the first-line work-up. Many MCED-positive patients have no cancer found on standard imaging, which creates anxiety and cost, whereas FAPI PET is more sensitive than FDG in pancreatic, gastric, low-grade and peritoneal disease, exactly the cancers MCED promises to catch, and has low background in liver, brain and bowel. The test is a prospective diagnostic study nested in a Galleri deployment such as the NHS or a PATHFINDER-like cohort, randomising FDG versus FAPI PET. Speculative in maturity, it addresses the bottleneck The hardest cancers are found late and is linked from the ideas on a 28-day MCED-positive resolution pathway and whole-population interception.","asOf":"2026-09-04","links":[{"label":"PATHFINDER: the first prospective test of a multi-cancer blood test in people without symptoms (The Lancet 2023)","url":"https://doi.org/10.1016/S0140-6736(23)01700-2"}],"tags":[],"related":[],"indications":[],"sections":[],"technologies":["fapi-pet","fdg-pet"],"targets":["fap"],"drugs":[],"companies":[],"institutions":[],"pathways":[],"terms":[],"trials":[],"people":[],"bottlenecks":[],"keyPapers":[],"journals":[],"dependsOn":[],"notes":[],"hypothesis":"FAPI PET/CT increases the cancer detection rate and reduces time to diagnosis in MCED-positive, FDG-negative or tissue-of-origin-uncertain patients.","rationale":"Complementary biology (stroma vs glucose); FAPI has low background in liver, brain, and bowel.","test":"Prospective diagnostic study nested in a Galleri deployment (e.g., NHS or PATHFINDER-like) randomising FDG vs FAPI PET as first-line workup.","maturity":"speculative"},"route":"/ideas/idea-mced-plus-fapi/","neighbours":{"technology":[{"id":"fapi-pet","kind":"technology","name":"FAPI PET","route":"/technologies/fapi-pet/"},{"id":"fdg-pet","kind":"technology","name":"FDG PET","route":"/technologies/fdg-pet/"}],"target":[{"id":"fap","kind":"target","name":"FAP","route":"/targets/fap/"}]}}