The potential burden of overinvestigation

The potential burden of overinvestigation Juliet Dobson managing editorWhy is the NHS currently involved in a £150m trial of the Galleri blood test?The test can detect more than 50 types of cancer, says Grail-the US based biotechnology company that makes it-and could help diagnose cancers at an earlier stage.But an investigation by The BMJ raises concerns that evidence is insufficient to justify its use as a screening tool (