Thermo Fisher Scientific Inc. has inked a definitive agreement to acquire Mesa Biotech Inc., a privately held molecular diagnostics company with a point-of-care (POC) platform, for approximately $450 million in cash. The scientific instruments and testing giant said it will pay an additional $100 million in cash upon the completion of certain milestones. The planned acquisition will expand Thermo Fisher’s franchise of diagnostic test options with a novel platform that enables nucleic acid polymerase chain reaction (PCR) testing at the point of care.