A test which detects changing levels of tumor fragments in the blood may be an easy, non-invasive and quick way to predict who will benefit from immunotherapy, a treatment option for advanced cancers. Although immunotherapy has been shown to shrink tumours and prolong survival for patients for whom other treatments have failed, about 20 to 30% of patients benefit from it. Clinicians don’t yet know ahead of time who this subset of patients is.
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