InterMune Sinks on Competition From Boehringer Lung Drug

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InterMune Inc., the developer of a medicine for idiopathic pulmonary fibrosis, dropped the most in more than two years as investors grew concerned about competition from drugmaker Boehringer Ingelheim GmbH.

InterMune fell 18 percent to $13.35 at the close in New York, its biggest decline since December 2011. The Brisbane, California-based company has gained 36 percent in the past year.