The FDA has approved the “chemo combo” of Merck & Co.’s Keytruda with Eli Lilly’s Alimta for treatment for patients with non-squamos non-small cell lung cancer who have not been previously treated. That’s great news for the patients, but not the best news for Bristol-Myers Squibb and AstraZeneca who have their own combo and are attempting to get it approved. The announcement brings “the first true endorsement of the general ‘chemo combo’ approach,” according to Bernstein analyst Tim Anderson. Anderson says it is “not yet clear” how BMS and AZ’s product will perform. What is clear? Merck is trying to pull far, far away from the competition.