Amgen will pay $52 per share in cash, which represents a premium of nearly 116% to ChemoCentryx's closing price on Wednesday.

ChemoCentryx makes Tavneos, a drug approved to treat patients with a rare form of blood vessel inflammation. The therapy brought in sales of $5.4 million in the first full quarter since its launch.

The company has three drugs in early-stage trials to treat inflammatory diseases and is also developing a cancer drug.

(Reporting by Manas Mishra in Bengaluru; Editing by Aditya Soni)