The levels of tumour DNA tell us how the cancer is responding to treatment.’ Professor Peter Johnson, Cancer Research UK’s chief clinician, said: ‘These results hold the promise of a system that could allow us to modify someone’s treatment as their cancer changes, and they suggest an exciting way to quickly get hold of the personal details of a cancer, to target it for the most effective therapy.’ A breakthrough drug for women with an aggressive form of breast cancer could prevent their condition worsening for an extra six months.
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