Simple blood test can predict which breast cancer treatment will work best, study finds

Exclusive: DNA test means patients could be offered most effective treatment first, boosting their chances of beating the disease

Scientists have developed a simple DNA blood test that can predict how well patients with breast cancer will respond to treatment.

More than 2 million people globally each year are diagnosed with the disease, which is the world's most prevalent cancer. Although treatments have improved in recent decades, it is not easy to know which ones will work best for which patients.