A blood test may be able to detect signs of cancer returning months before it can be seen on a scan, researchers have discovered.
The test, called a ‘liquid biopsy’, detects tiny fragments of circulating tumour DNA, or ctDNA, in the blood and looks for genetic changes linked to cancer.
Researchers reviewed evidence from dozens of previous studies and clinical trials on ctDNA.
They found that ctDNA can sometimes show if treatment is working, identify mutations that could help doctors choose next steps and detect tiny amounts of cancer left in the body.
The researchers said an early rise in ctDNA could allow doctors
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