The BEST4 Screening trial tests a 'pill-on-a-thread' for Barrett’s oesophagus, a precursor to oesophageal cancer, aiming to reduce cancer treatments and deaths. Over three years, 120,000 heartburn medication users will be recruited in England via text message invitations. The capsule sponge test, developed by Cambridge University and Cancer Research UK, is faster, less invasive, and cheaper than endoscopy. The trial, backed by £6.4 million, seeks to prove the test's viability for nationwide screening.