Roche blood test could help 'personalise' cancer immunotherapy
A new blood test from Roche and Foundation Medicine has shown it can accurately measure the number of mutations within a tumour, potentially helping to predict which patients may respond best to some immunotherapies. Initial data on Roche's test aimed at determining tumour mutational burden, or TMB , was released on Friday at the European Society for Medical Oncology ( ESMO ) congress in Madrid. Immunotherapies such as Roche's Tecentriq , Merck's Keytruda and Bristol-Myers Squibb 's Opdivo have offered fresh hope to people with deadly cancers, but they only work in a fraction of patients. And given immunotherapies' high costs and possible serious side effects, with British regulators having dubbed Tecentriq too expensive, doctors want better ways to identify which patients would benefit the most from such treatments. Evidence shows that tumours with more mutations are more likely to respond to immunotherapy, Roche sai...