- Long-term follow-up data for PADCEV® (enfortumab vedotin-ejfv) with KEYTRUDA® (pembrolizumab) in advanced bladder cancer to be featured as oral presentation –

- Updated Phase 1 data on first-in-class integrin beta-6 targeted antibody-drug conjugate (ADC) (SGN-B6A) to be presented –

Seagen Inc. (Nasdaq: SGEN) today announced the presentation of 17 abstracts at the upcoming 2023 American Society of Clinical Oncology (ASCO) Annual Meeting taking place June 2-6, 2023, in Chicago. Data will be presented across Seagen's portfolio of approved medicines and pipeline agents in a range of cancer types and in earlier lines of therapy.

“Seagen has worked towards revolutionizing cancer care for 25 years by linking scientific innovation to meaningful impacts in patients’ lives,” said Roger Dansey, M.D., President, Research and Development and Chief Medical Officer at Seagen. “Our data presented at ASCO demonstrate continued progress in our efforts to discover and develop transformative medicines.”

Highlights include new data from a robust clinical development program in bladder cancer with trials across multiple lines of treatment and into earlier stages of disease for muscle-invasive and non-muscle invasive forms of bladder cancer. Long-term follow-up data from a clinical trial of PADCEV^® (enfortumab vedotin-ejfv) (EV-103 dose-escalation and Cohort A) will be featured in an oral presentation on Monday, June 5. The EV-103 dose-escalation/Cohort A study is evaluating PADCEV, developed in partnership with Astellas, in combination with Merck’s anti-PD-1 therapy KEYTRUDA^® (pembrolizumab) as first-line treatment in patients with locally advanced or metastatic urothelial carcinoma who are ineligible to receive cisplatin-based chemotherapy. Merck is known as MSD outside the United States and Canada.

Updated Phase 1 data will be presented for SGN-B6A, a wholly-owned, first-in-class vedotin ADC directed to integrin beta-6, a novel target that is highly expressed in multiple solid tumors.

Additionally, initial data will be presented from studies evaluating Seagen’s approved medicines in potential new cancer types. Data from a Phase 2 basket study of TUKYSA^® (tucatinib) and trastuzumab in previously treated HER2-positive metastatic biliary tract cancer will be featured in an oral presentation on Friday, June 2.

Key data presentations for Seagen include:

Presentations of Company-Sponsored Trials

Presentations of Investigator-Sponsored Trials

About Seagen

Seagen Inc. is a global biotechnology company that discovers, develops and commercializes transformative cancer medicines to make a meaningful difference in people’s lives. Seagen is headquartered in the Seattle, Washington area, and has locations in California, Canada, Switzerland and the European Union. For more information on our marketed products and robust pipeline, visit www.seagen.com and follow @SeagenGlobal on Twitter.

Forward-Looking Statements

Certain statements made in this press release are forward looking, such as those, among others, relating to the therapeutic potential of PADCEV^® (enfortumab vedotin-ejfv), TUKYSA^® (tucatinib), disitamab vedotin, and the company’s other products and product candidates, including their potential efficacy, safety and therapeutic uses, and Seagen’s pipeline. 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 without limitation the difficulty and uncertainty of pharmaceutical product development, including the risks that the company may experience delays in its clinical trials or otherwise experience failures or setbacks in its clinical development programs due to lack of efficacy, adverse events or other factors, and that adverse regulatory actions may occur. More information about the risks and uncertainties faced by Seagen is contained under the caption “Risk Factors” included in the company’s Annual Report on Form 10-K for the year ended December 31, 2022, filed with the Securities and Exchange Commission. Seagen disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

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