2 cancer drugmakers just presented key data about how new treatments work in lung cancer - and the markets picked a winner

• Two cancer drugmaker rivals presented data on Monday about how combinations of their drugs, which harness the body's immune system to treat cancer, worked in treating a common form of lung cancer compared to traditional chemotherapy.
• Merck showed that its drug Keytruda in combination with chemotherapy cut the risk of death in lung cancer patients in half.
• Bristol-Myers Squibb, which makes a competing immunotherapy, Opdivo, showed that its drug in combination with Yervoy, another immunotherapy, managed to keep patients with tumors that had a certain amount of mutations from getting worse for a longer period of time than those treated with chemotherapy.
• The markets picked Merck as the winner based on its data. Merck's stock was up by as much as 3% on Monday while BMS was down about 5%.
• Read more about the results, which have a big implication on how lung cancer's treated, here.

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