Merck advancing breast cancer drug to mid-stage

Drugmaker Merck Co. says it will advance a new cancer drug into bigger patient tests, after promising findings in an early study against a very aggressive, common type of breast cancer.

Merck says its Keytruda (KEE’truh-duh) shrank tumors in one-third of patients, all of whom had t…

Merck advancing breast cancer drug to mid-stage