Why did BMS buy Mirati?

Could you elaborate on the reasoning behind BMS's decision to acquire Mirati? What strategic benefits does this acquisition offer to BMS, and how does it align with their long-term goals and vision in the healthcare industry? Additionally, what specific factors or market trends influenced their decision to invest in Mirati's technology or pipeline of drugs? Furthermore, how does this acquisition position BMS in the competitive landscape, and what impact could it have on their financial performance and shareholder value in the coming years?