Pfizer Inc. (PFE) is back in the megamerger game. The U.S. drugmaker proposed buying AstraZeneca Plc (AZN) for about 58.8 billion pounds ($98.7 billion) in what would rank as the industry’s biggest-ever takeover, surpassing Pfizer’s $64 billion purchase of Wyeth in 2009. AstraZeneca

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