In another multibillion-dollar bid to further strengthen its oncology pipeline, Merck & Co. Inc. is set to acquire privately held Velosbio Inc. for $2.75 billion in cash. Velosbio is developing cancer therapies targeting receptor tyrosine kinase-like orphan receptor 1. The company’s follow-on programs include next-generation antibody-drug conjugates and bispecific immune-engagers targeting ROR1, which it has been developing for nearly two years.