Merck & Co. Inc. arguably got a leg up in its bid to lead immuno-oncology coming out of the American Association for Cancer Research meeting, between the rise of IDO as a target and new data showing disappointing efficacy for Bristol-Myers Squibb Co.'s CTLA-4/PD-1 combination in melanoma compared to PD-1 monotherapy. But development activity is intense and it's unclear where it will all end.
At this year's AACR annual meeting, held April 1-6 in Washington D.C., Bristol reported that its Opdivo/Yervoy combination was superior...