The sales lead for Merck & Co. Inc.'s PD-1 inhibitor Keytruda over Bristol-Myers Squibb Co.'s closely competing Opdivo and other checkpoint inhibitors widened in the fourth quarter, as the drug brought in almost $2.2bn, and the lead is expected to grow throughout the year.
As usual, the company was pressed by analysts during its earnings call on Feb. 1 about its reliance on Keytruda,...








