U.S. researchers have published a study in The New England Journal of Medicine that claims the drug trastuzmuzab can stop almost half of all breast cancers from reappearing. The drug is currently used to treat advanced cancers.

The treatment only works with women whom have high levels of the protein HER2, the protein makes the cancer more active. 1 in 5 women with breast cancer have the protein so this new treatment can benefit a lot of women with breast cancer.