Esbriet

Treatment for Idiopathic Pulmonary Fibrosis

InterMune Announces Posting of Briefing Documents for FDA Advisory Committee Meeting on Pirfenidone

BRISBANE, Calif., March 5 /PRNewswire-FirstCall/ -- InterMune, Inc. announced today that the U.S. Food and Drug Administration (FDA) has posted briefing documents for the March 9 Pulmonary-Allergy Drugs Advisory Committee (PADAC) meeting to review the New Drug Application (NDA) for pirfenidone, InterMune's investigational drug candidate for the treatment of patients with idiopathic pulmonary fibrosis (IPF) to reduce decline in lung function. The proposed trade name for pirfenidone is Esbriet.

IPF is a disabling and ultimately fatal disease that affects approximately 200,000 people in the United States and Europe combined, with approximately 30,000 new cases reported per year in each region. There are no medicines approved in the United States or in Europe for the treatment of IPF. Pirfenidone was approved in Japan in October of 2008 and is marketed by Shionogi & Co. Ltd as Pirespa®.

Pirfenidone Regulatory Path - NDA and MAA

On November 4, 2009, InterMune submitted the NDA for pirfenidone to the FDA, seeking approval to market pirfenidone for the treatment of patients with IPF to reduce decline in lung function. Pirfenidone has been granted Orphan Drug and Fast Track designation by the FDA, and also has been granted Orphan Drug status in Europe. On January 4, 2010, InterMune announced that the FDA granted Priority Review designation for the pirfenidone NDA. Priority Review designation may be granted by the FDA to an NDA for drugs that have the potential to offer major advances in treatment, or provide a treatment where no adequate therapy exists. Based on the Prescription Drug User Fee Act (PDUFA), the FDA has set an action date for the NDA of May 4, 2010.

On March 2, 2010, InterMune announced that it had submitted a Marketing Authorization Application (MAA) to the European Medicines Agency (EMA), seeking approval to market pirfenidone for the treatment of IPF patients in the European Union.

About Pirfenidone

Preclinical and in-vitro evidence have shown that pirfenidone has both anti-fibrotic and anti-inflammatory effects. In February 2009, InterMune announced the results of the company's two global Phase 3 clinical trials evaluating pirfenidone for the treatment of IPF, known as the CAPACITY trials. InterMune believes that these data support the safety and efficacy of pirfenidone in IPF patients on a number of clinical measures. Prior to the CAPACITY results, data had previously been presented from another Phase 3 study and three Phase 2 clinical trials in more than 400 patients which suggested that pirfenidone may positively affect lung function and disease progression in patients with IPF. In those clinical studies, pirfenidone was safe and generally well-tolerated, with the most frequent side effects reported being photosensitivity rash and gastrointestinal symptoms. In October of 2008, pirfenidone was approved for use in IPF patients in Japan and is marketed as Pirespa® by Shionogi & Co. Ltd. in that country.

About IPF

IPF is characterized by inflammation and scarring (fibrosis) in the lungs, hindering the ability to process oxygen and causing shortness of breath (dyspnea) and cough and is a progressive disease, meaning that over time, lung scarring and symptoms increase in severity. The median survival time from diagnosis is two to five years, with a five-year survival rate of approximately 20%. Patients diagnosed with IPF are usually between the ages of 40 and 70, with a median age of 63 years and the disease tends to affect slightly more men than women.

About InterMune

InterMune is a biotechnology company focused on the research, development and commercialization of innovative therapies in pulmonology and hepatology. InterMune has an R&D portfolio addressing idiopathic pulmonary fibrosis (IPF) and hepatitis C virus (HCV) infections. The pulmonology portfolio includes pirfenidone for which InterMune has completed a Phase 3 program in patients with IPF (CAPACITY) and a New Drug Application (NDA) has been accepted for Priority Review by the FDA. The hepatology portfolio includes the HCV protease inhibitor compound RG7227 (ITMN-191) that entered Phase 2b in August 2009 and a second-generation HCV protease inhibitor research program. For additional information about InterMune and its R&D pipeline, please visit www.intermune.com.

Forward-Looking Statements

This news release contains forward-looking statements within the meaning of section 21E of the Securities Exchange Act of 1934, as amended, which reflect InterMune's judgment and involve risks and uncertainties as of the date of this release, including without limitation the statements related to anticipated regulatory timelines and the likelihood of regulatory success. All forward-looking statements and other information included in this press release are based on information available to InterMune as of the date hereof, and InterMune assumes no obligation to update any such forward-looking statements or information. InterMune's actual results could differ materially from those described in InterMune's forward-looking statements. Pirfenidone failed to achieve statistical significance on the primary endpoint in one of its two pivotal clinical trials and there can be no assurance that the regulatory authorities in either the United States or Europe will grant regulatory approval based upon these data, in combination with the other efficacy analyses and safety results the company has submitted in support of its NDA and MAA filings. Factors that could cause or contribute to such differences include, but are not limited to, those discussed in detail in the risk factors attached as Exhibit 99.3 to InterMune's Form 8-K filed with the SEC on January 20, 2010, and other periodic reports filed with the SEC, including the following: (i) risks related to the long, expensive and uncertain clinical development and regulatory process, including having no unexpected safety, toxicology, clinical or other issues or delays in anticipated timing of the regulatory approval process; (ii) risks related to failure to achieve the clinical trial results required to commercialize our product candidates; and (iii) risks related to timely patient enrollment and retention in clinical trials. The risks and other factors discussed above should be considered only in connection with the fully discussed risks and other factors discussed in detail in the Form 8-K and InterMune's other periodic reports filed with the SEC. InterMune undertakes no duty or obligation to update any forward-looking statements contained in this release as a result of new information, future events or changes in InterMune's expectations.

Source: InterMune, Inc.

CONTACT: Jim Goff of InterMune, Inc., +1-415-466-2228, jgoff@intermune.com

Web Site: http://www.intermune.com/

Posted: March 2010

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