U.S. FDA and European Medicines Agency Accept Regulatory Submissions for Review of Dacomitinib to Treat Metastatic Non-Small Cell Lung Cancer with EGFR-Activating Mutations

The FDA grants Priority Review to medicines that may offer significant advances in treatment or may provide a treatment where no adequate therapy exists. The Prescription Drug User Fee Act (PDUFA) goal date for a decision by the FDA is in September 2018.

“While significant progress has been made in the treatment of patients with non-small cell lung cancers harboring EGFR-activating mutations, it remains a challenging disease and new treatment options are needed,” said Mace Rothenberg, M.D., chief development officer, Oncology, Pfizer Global Product Development. “In the pivotal clinical trial that supports these applications, dacomitinib showed clinically meaningful improvement in progression-free survival over gefitinib, one of the first EGFR-targeted therapies to demonstrate activity in this disease. These filing acceptances are an important step toward increasing treatment options for patients with locally advanced or metastatic EGFR-mutated non-small cell lung cancer.”

Dacomitinib is the second investigational Pfizer lung cancer medicine to receive regulatory acceptance within two months, reinforcing Pfizer’s commitment to patients with NSCLC where there continues to be a significant unmet need.

The submissions are based on results from the Phase 3 ARCHER 1050 study, a global head-to-head trial investigating dacomitinib (n=227) compared to gefitinib (n=225) that showed dacomitinib may offer a clinically meaningful improvement over gefitinib. Patients that received dacomitinib in the study experienced a median progression-free survival (PFS) of 14.7 months compared with 9.2 months in patients treated with gefitinib, as measured by Blinded Independent Central Review (BICR). This difference represented a 41 percent reduction in the risk of disease progression or death for patients treated with dacomitinib compared with gefitinib (HR = 0.59 [95% CI: 0.47,0.74], p <0.0001) as a first-line treatment in locally advanced or metastatic NSCLC with EGFR-activating mutations.

The adverse events (AEs) observed with dacomitinib in the study were consistent with findings from previous trials. The most common AEs were diarrhea (87%), nail changes (62%), rash/dermatitis acneiform (49%), and mouth sores (44%). The most common Grade 3 AEs with dacomitinib were rash (14%) and diarrhea (8%). Grade 4 AEs occurred in 2 percent of dacomitinib-treated patients. There was one case of Grade 5 diarrhea and one case of Grade 5 liver disease. The discontinuation rate due to treatment-related AEs for dacomitinib was 10 percent compared to 7 percent for gefitinib.

The ARCHER 1050 results were published in Lancet Oncology, shared as an oral late-breaker presentation at the 2017 American Society of Clinical Oncology (ASCO) Annual Meeting and featured in the ASCO press program. A final assessment of overall survival from ARCHER 1050 will be presented at a medical meeting later this year.

About Dacomitinib

Dacomitinib is an investigational, oral, once-daily, irreversible pan-human epidermal growth factor receptor tyrosine kinase inhibitor (TKI). It has not received regulatory approval in any country.

In 2012, Pfizer and SFJ Pharmaceuticals Group entered into a collaborative development agreement to conduct ARCHER 1050 across multiple sites.

About Non-Small Cell Lung Cancer

Lung cancer is the leading cause of cancer deaths worldwide.¹ NSCLC accounts for about 85 percent of lung cancer cases and remains difficult to treat, particularly in the metastatic setting.² Approximately 75 percent of NSCLC patients are diagnosed late with metastatic or advanced disease where the five-year survival rate is only five percent.^2,3,4

EGFR is a protein that helps cells grow and divide. When the EGFR protein is mutated it can cause cancer cells to form. EGFR mutations occur in 10 to 35 percent of NSCLC tumors globally, yet the disease is associated with low survival rates and disease progression remains a challenge. ^5,6

About Pfizer in Lung Cancer

Pfizer Oncology is committed to addressing the unmet needs of patients with lung cancer, the leading cause of cancer-related deaths worldwide and a particularly difficult-to-treat disease. Pfizer strives to address the diverse and evolving needs of patients with non-small cell lung cancer (NSCLC) by developing efficacious and tolerable therapies, including biomarker-driven therapies and immuno-oncology (IO) agents and combinations. By combining leading scientific insights with a patient-centric approach, Pfizer is continually advancing its work to match the right patient with the right medicine at the right time. Through our growing research pipeline and collaboration efforts, we are committed to delivering renewed hope to patients living with NSCLC.

About Pfizer Oncology

Pfizer Oncology is committed to pursuing innovative treatments that have a meaningful impact on people living with cancer. Our growing pipeline of biologics, small molecules, and immunotherapies is focused on identifying and translating the best scientific breakthroughs into clinical application for patients across a diverse array of solid tumors and hematologic cancers. Today, we have 10 approved oncology medicines and 17 assets currently in clinical development. By maximizing our internal scientific resources and collaborating with other companies, government and academic institutions, as well as non-profit and professional organizations, we are bringing together the brightest and most enterprising minds to take on the toughest cancers. Together we can accelerate breakthrough treatments to patients around the world and work to redefine life with cancer.

Working together for a healthier world^®

At Pfizer, we apply science and our global resources to bring therapies to people that extend and significantly improve their lives. We strive to set the standard for quality, safety and value in the discovery, development and manufacture of health care products. Our global portfolio includes medicines and vaccines as well as many of the world's best-known consumer health care products. Every day, Pfizer colleagues work across developed and emerging markets to advance wellness, prevention, treatments and cures that challenge the most feared diseases of our time. Consistent with our responsibility as one of the world's premier innovative biopharmaceutical companies, we collaborate with health care providers, governments and local communities to support and expand access to reliable, affordable health care around the world. For more than 150 years, we have worked to make a difference for all who rely on us. We routinely post information that may be important to investors on our website at www.pfizer.com. In addition, to learn more, please visit us on www.pfizer.com and follow us on Twitter at @Pfizer and @Pfizer_News, LinkedIn, YouTube, and like us on Facebook at Facebook.com/Pfizer.

DISCLOSURE NOTICE: The information contained in this release is as of April 4, 2018. Pfizer assumes no obligation to update forward-looking statements contained in this release as the result of new information or future events or developments.

This release contains forward-looking information about a product candidate, dacomitinib, and Pfizer Oncology, including their potential benefits, that involves substantial risks and uncertainties that could cause actual results to differ materially from those expressed or implied by such statements. Risks and uncertainties include, among other things, the uncertainties inherent in research and development, including, without limitation, the ability to meet anticipated clinical trial commencement and completion dates and regulatory submission dates, as well as the possibility of unfavorable clinical trial results, including unfavorable new clinical data and additional analyses of existing clinical data; the risk that clinical trial data are subject to differing interpretations, and, even when we view data as sufficient to support the safety and/or effectiveness of a product candidate, regulatory authorities may not share our views and may require additional data or may deny approval altogether; whether regulatory authorities will be satisfied with the design of and results from our clinical studies; whether and when new drug applications may be filed in any other jurisdictions for dacomitinib or for any other oncology products; whether and when the applications for dacomitinib pending with the FDA and the European Medicines Agency or any such other applications may be approved by regulatory authorities, which will depend on the assessment by such regulatory authorities of the benefit-risk profile suggested by the totality of the efficacy and safety information submitted, and, if approved, whether dacomitinib or any such other oncology products will be commercially successful; decisions by regulatory authorities regarding labeling and other matters that could affect the availability or commercial potential of dacomitinib or any other oncology products; and competitive developments.

A further description of risks and uncertainties can be found in Pfizer’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017 and in its subsequent reports on Form 10-Q, including in the sections thereof captioned “Risk Factors” and “Forward-Looking Information and Factors That May Affect Future Results”, as well as in its subsequent reports on Form 8-K, all of which are filed with the U.S. Securities and Exchange Commission and available at www.sec.gov and www.pfizer.com.

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