Seattle Genetics, Inc. (Nasdaq: SGEN), a global biotechnology company, today announced that the U.S. Food and Drug Administration (FDA) has granted Breakthrough Therapy Designation to ADCETRIS (brentuximab vedotin) for the treatment of patients with CD30-expressing mycosis fungoides (MF) and primary cutaneous anaplastic large cell lymphoma (pcALCL) who require systemic therapy and have received one prior systemic therapy. MF and pcALCL are the most common subtypes of cutaneous T-cell lymphoma (CTCL), accounting for more than 75 percent of the disease. ADCETRIS has been evaluated in CD30-expressing CTCL in investigator- and corporate-sponsored clinical trials, including the phase 3 ALCANZA study. The positive topline results of the ALCANZA trial were announced in August 2016 and an abstract was accepted for oral presentation at the upcoming American Society of Hematology (ASH) annual meeting, December 3-6, 2016 in San Diego, California. ADCETRIS is an antibody-drug conjugate (ADC) directed to CD30 which is expressed on skin lesions in approximately 50 percent of patients with CTCL. ADCETRIS is currently not approved for the treatment of CTCL. The FDA's Breakthrough Therapy Designation is intended to expedite the development and review of promising drug candidates for serious or life-threatening conditions. It is based upon clinical evidence of substantial improvement over existing therapies on one or more clinically significant endpoints. "The decision by the FDA to grant ADCETRIS Breakthrough Therapy Designation further reinforces our belief that ADCETRIS represents a meaningful advance in the treatment of CD30-expressing CTCL," said Clay Siegall, Ph.D., President and Chief Executive Officer of Seattle Genetics. "The Breakthrough Therapy Designation supports our goal to expedite the review and approval process to make ADCETRIS available to patients in this setting who may benefit. We look forward to presenting the data from our phase 3 ALCANZA trial in an oral session at the upcoming ASH annual meeting and intend to submit a supplemental Biologics License Application to the FDA in the first half of 2017 for approval in this setting."