Hopes that a “revolutionary” cancer blood test could soon be rolled out on the NHS have been dashed after a trial failed to achieve its main goal. The NHS had hoped to prove that the first multi-cancer blood test, which has been dubbed the “Holy Grail” for medical researchers, could reduce the number diagnosed in later stages. The Galleri test looked for tiny fragments of tumour DNA in the blood, which can reveal the presence of the disease before symptoms emerge. It was evaluated in a three-