Adcetris

Treatment for Lymphoma, Hodgkin's Disease

Update: Adcetris (brentuximab vedotin) Now FDA Approved - August 19, 2011

FDA Accepts Brentuximab Vedotin BLAs for Filing

Seattle Genetics Announces FDA Accepts Brentuximab Vedotin BLAs for Filing and Grants Priority Review for Relapsed or Refractory Hodgkin Lymphoma and Systemic ALCL

BOTHELL, Wash.--(BUSINESS WIRE)--May 2, 2011 - Seattle Genetics, Inc. announced today that the U.S. Food and Drug Administration (FDA) has accepted for filing two Biologics License Applications (BLAs) for brentuximab vedotin, including one for the treatment of patients with relapsed or refractory Hodgkin lymphoma and one for the treatment of patients with relapsed or refractory systemic anaplastic large cell lymphoma (ALCL). The FDA administratively separated the original BLA submission and will act individually on the application for each indication. In addition, the FDA has granted a six-month priority review of both applications, and has established an action date of August 30, 2011 under the Prescription Drug User Fee Act (PDUFA). Priority review designation is assigned to drugs that, if approved, would address an unmet medical need for a serious or life-threatening condition. Brentuximab vedotin is an antibody-drug conjugate (ADC) directed to CD30, a defining marker of Hodgkin lymphoma and ALCL.

"These filings and priority review designations are an important step forward in our effort to bring brentuximab vedotin to the many relapsed and refractory Hodgkin lymphoma and systemic ALCL patients in need," said Clay B. Siegall, Ph.D., President and Chief Executive Officer of Seattle Genetics. "We look forward to continued interactions with the FDA as they review our brentuximab vedotin BLAs."

Seattle Genetics announced on February 28, 2011 that it had submitted a BLA for brentuximab vedotin based on results from both a pivotal trial in relapsed or refractory Hodgkin lymphoma and a phase II trial in relapsed or refractory systemic ALCL that were presented at the American Society of Hematology (ASH) Annual Meeting in December 2010. The pivotal trial in Hodgkin lymphoma was conducted under a Special Protocol Assessment (SPA) with the FDA. Brentuximab vedotin has been granted orphan drug designation by the FDA for the treatment of Hodgkin lymphoma and ALCL.

About Brentuximab Vedotin

Brentuximab vedotin is an ADC comprising an anti-CD30 monoclonal antibody attached by a protease-cleavable linker to a potent, synthetic drug, monomethyl auristatin E (MMAE) utilizing Seattle Genetics' proprietary technology. The ADC employs a novel linker system that is designed to be stable in the bloodstream but to release MMAE upon internalization into CD30-expressing tumor cells. This approach is intended to spare non-targeted cells, which may help minimize the potential toxic effects of traditional chemotherapy while allowing for the selective targeting of CD30-expressing cancer cells, thus potentially enhancing the antitumor activity.

Seattle Genetics is developing brentuximab vedotin in collaboration with Millennium: The Takeda Oncology Company. Under the terms of the collaboration agreement, Seattle Genetics has U.S. and Canadian commercialization rights and the Takeda Group has rights to commercialize brentuximab vedotin in the rest of the world. Seattle Genetics and the Takeda Group are funding joint development costs for brentuximab vedotin on a 50:50 basis, except in Japan where Takeda will be solely responsible for development costs.

About Hodgkin Lymphoma

Lymphoma is a general term for a group of cancers that originate in the lymphatic system. There are two major categories of lymphoma: Hodgkin lymphoma and non-Hodgkin lymphoma. Hodgkin lymphoma is distinguished from other types of lymphoma by the presence of one characteristic type of cell, known as the Reed-Sternberg cell. A defining attribute of the Reed-Sternberg cell is its expression of the CD30 antigen.

According to the American Cancer Society, approximately 8,500 cases of Hodgkin lymphoma were diagnosed in the United States during 2010 and more than 1,300 people were expected to die from the disease. Although front-line combination chemotherapy can result in durable response rates, up to 30 percent of these patients relapse or are refractory to front-line treatment and have few therapeutic options beyond autologous stem cell transplant.

About Systemic ALCL

ALCL is an aggressive type of T-cell non-Hodgkin lymphoma that highly expresses CD30. In the United States, approximately 2,000 systemic ALCL patients are diagnosed annually. Although front-line combination chemotherapy can result in durable remissions, approximately 50 percent of ALCL patients relapse or are refractory to front-line treatment and have few therapeutic options.

About Seattle Genetics

Seattle Genetics is a clinical-stage biotechnology company focused on the development and commercialization of monoclonal antibody-based therapies for the treatment of cancer and autoimmune disease. The FDA has granted priority review to Biologics License Applications for its lead product candidate, brentuximab vedotin, for the treatment of relapsed or refractory Hodgkin lymphoma and systemic anaplastic large cell lymphoma, with a PDUFA date of August 30 2011. Brentuximab vedotin is being developed in collaboration with Millennium: The Takeda Oncology Company. In addition, Seattle Genetics has four other clinical-stage programs: SGN-75, ASG-5ME, dacetuzumab (SGN-40) and SGN-70. Seattle Genetics has collaborations for its ADC technology with a number of leading biotechnology and pharmaceutical companies, including Abbott, Bayer, Celldex Therapeutics, Daiichi Sankyo, Genentech, GlaxoSmithKline, Millennium, Pfizer and Progenics, as well as ADC co-development agreements with Agensys, an affiliate of Astellas, and Genmab. More information can be found at www.seattlegenetics.com.

Certain of the statements made in this press release are forward looking, such as those, among others, relating to the company's expectations for regulatory approval and commercial launch of brentuximab vedotin. Actual results or developments may differ materially from those projected or implied in these forward-looking statements. Factors that may cause such a difference include risks that data from our clinical trials, including our pivotal Hodgkin lymphoma trial and phase II ALCL trial of brentuximab vedotin, will not support marketing approval for the submitted indications, or that FDA preapproval inspections of our facilities, our manufacturing facilities or inspections of our clinical study sites raise concerns that delay or prevent approval. In addition, we may have to make major amendments to our marketing application and consequently may be delayed in the planned U.S. commercial launch of brentuximab vedotin. Further, brentuximab vedotin may be approved pursuant to the accelerated approval regulations and we may be subject to completing post-marketing requirements and obtaining preapproval of our marketing and promotional materials. More information about the risks and uncertainties faced by Seattle Genetics is contained in the company's 10-K for the year ended December 31, 2010 filed with the Securities and Exchange Commission. Seattle Genetics disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Contact: Seattle Genetics, Inc.
Peggy Pinkston, 425-527-4160
ppinkston@seagen.com

Posted: May 2011

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