Bristol-Myers sues Merck in US over PD-1 patent

Bristol-Myers Squibb received US patent protection for methods of treating cancer with an antibody that inhibits programmed cell death-1 (PD-1) in May, but waited until Merck & Co's Keytruda (pembrolizumab) won US FDA approval for melanoma to sue for patent infringement.

Bristol-Myers had the first PD-1 inhibitor approved anywhere in the world when the company and its partner Ono Pharmaceuticals won...

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