Bristol Myers Squibb Co.’s relatlimab will hit the market as the first U.S. FDA-approved LAG-3 inhibitor, cleared by the agency for use in a fixed-dose combination with Opdivo (nivolumab) to treat adult and pediatric patients with unresectable or metastatic melanoma. The approval, a day ahead of the March 19 FDA target date, adds another type of immune checkpoint inhibitor to the oncology arsenal, which already includes drugs targeting PD-1/PD-L1 and CTLA4.