The primary endpoints of the ongoing clinical trial are to estimate the maximum tolerated dose and to evaluate the safety of SGN-CD19A. In addition, the trial is evaluating antitumor activity, pharmacokinetics, progression-free survival and overall survival. In this dose-escalation study, patients receive SGN-CD19A on days one and eight of every 21-day cycle. Key findings presented by Dr. Uma Borate from The University of Alabama in Birmingham, AL, included:
- At the time of data analysis, the maximum tolerated dose had not yet been reached. Enrollment and dose escalation are ongoing.
- Of the 16 adult patients treated across all dose levels, three (19 percent) achieved a complete remission or complete remission with incomplete platelet recovery, eight (50 percent) had resistant disease with clinical benefit or stable disease and five (31 percent) had progressive disease.
- At dose levels greater than 1.0 milligram per kilogram (mg/kg), eight of 10 adult patients had clinical benefit, consisting of complete remission, complete remission with incomplete platelet recovery, resistant disease with clinical benefit or stable disease.
- Of the four pediatric patients, one patient had resistant disease with clinical benefit, one had resistant disease without clinical benefit, one had progressive disease and one was unevaluable.
- The most common adverse events of any grade occurring in adult patients were fever (56 percent), nausea (44 percent), chills (38 percent), fatigue (38 percent), blurred vision (38 percent) and vomiting (38 percent). Adverse events seen in at least two pediatric patients (50 percent or more) were vomiting (three patients) and abdominal pain, cough, shortness of breath, nausea and fever (two patients each).
Preclinical data presented at the 2011 American Association for Cancer Research Annual Meeting demonstrated that SGN-CD19A effectively binds to target cells, internalizes and induces potent cell-killing activity and durable tumor regressions at low doses in multiple preclinical cancer models. SGN-CD19A is being evaluated in two ongoing phase 1 clinical trials for patients with B-cell ALL and aggressive non-Hodgkin lymphoma.About Acute Lymphoblastic Leukemia Acute lymphoblastic leukemia, also called acute lymphocytic leukemia or ALL, is an aggressive type of cancer of the bone marrow and blood that progresses rapidly without treatment. In ALL, lymphoblasts, which are malignant, immature white blood cells, multiply and crowd out normal cells in the bone marrow. ALL is the most common type of cancer in children. According to the American Cancer Society, approximately 6,000 people were diagnosed with ALL during 2012 and more than 1,400 died from the disease. About Seattle Genetics Seattle Genetics is a biotechnology company focused on the development and commercialization of innovative antibody-based therapies for the treatment of cancer. Seattle Genetics is leading the field in developing antibody-drug conjugates (ADCs), a technology designed to harness the targeting ability of antibodies to deliver cell-killing agents directly to cancer cells. The company’s lead product, ADCETRIS ® (brentuximab vedotin) is an ADC that, in collaboration with Takeda Pharmaceutical Company Limited, has been approved for two indications in more than 35 countries, including the U.S., European Union and Canada. Additionally, ADCETRIS is being evaluated broadly in more than 20 ongoing clinical trials. Seattle Genetics is also advancing a robust pipeline of clinical-stage ADC programs, including SGN-CD19A, SGN-CD33A, SGN-LIV1A, ASG-22ME and ASG-15ME. Seattle Genetics has collaborations for its ADC technology with a number of leading biotechnology and pharmaceutical companies, including AbbVie, Agensys (an affiliate of Astellas), Bayer, Genentech, GlaxoSmithKline and Pfizer. 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 therapeutic potential of SGN-CD19A. 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 the inability to show sufficient activity in these recently initiated clinical trials and the risk of adverse events as SGN-CD19A advances in clinical trials. More information about the risks and uncertainties faced by Seattle Genetics is contained in the company’s 10-Q for the quarter ended September 30, 2013 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.