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Merck, Sharp & Dohme (MSD; NYSE: MRK) has announced that its blockbuster anti-PD-1 drug Keytruda (pembrolizumab) has entered a Phase Ia/b trial in combination with South Korea-based PharmAbcine’s (KOSDAQ: 208340) VISTA-inhibiting biologic PMC-309 for the treatment of advanced or metastatic solid tumors. The study aims to determine the recommended dose,…