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    4503   JP3942400007


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Astellas Pharma : and Seagen Announce Presentation of Results from PADCEV Pivotal Trial in Patients with Previously Treated Advanced Urothelial Cancer Who Were Ineligible for Cisplatin Chemotherapy

02/15/2021 | 10:39am EDT

Astellas Pharma Inc. (TSE: 4503, President and CEO: Kenji Yasukawa, Ph.D., 'Astellas') and Seagen Inc. (Nasdaq: SGEN) today announced results from the second cohort of patients in the pivotal phase 2 single-arm EV-201 trial.

In the trial, 52 percent of patients who received PADCEV (enfortumab vedotin-ejfv) had an objective response (95 percent Confidence Interval [CI]: 40.8, 62.4) and the median duration of response was 10.9 months (95 percent CI: 5.8, NR). Twenty percent of patients had a complete response, the absence of detectable cancer, after PADCEV treatment, and 31 percent had a partial response. Adverse events were consistent with those observed in previous trial data, with the most common all-grade treatment-related adverse events (AEs) being alopecia (51 percent), peripheral sensory neuropathy (47 percent), and fatigue (34 percent).

Cohort 2 of the EV-201 trial evaluated PADCEV in patients with locally advanced or metastatic urothelial cancer who had been previously treated with a PD-1/L1 inhibitor, had not received a platinum-containing chemotherapy in this setting, and were ineligible for cisplatin. Urothelial cancer is the most common type of bladder cancer and can also be found in the renal pelvis, ureter and urethra.1

The findings were presented today in an oral presentation as part of the virtual scientific program of the American Society of Clinical Oncology Genitourinary Cancers Symposium (ASCO GU) (Abstract 394).

'Roughly half of all patients with locally advanced or metastatic urothelial cancer have comorbidities that make them ineligible for cisplatin-based chemotherapy and after progression on first-line immunotherapy, there are few effective treatment options,' said Arjun Balar, M.D., Associate Professor of Medicine, Director Genitourinary Medical Oncology Program, NYU Laura and Isaac Perlmutter Cancer Center, NYU Langone Health and an investigator for the trial. 'Results from EV-201 cohort 2 indicate that enfortumab vedotin may be an important therapeutic option for these patients.'

'Fifty-two percent of patients in this study cohort responded to PADCEV - including some patients who showed no detectable cancer following treatment - an important result for people with this difficult-to-treat form of urothelial cancer,' said Andrew Krivoshik, M.D., Ph.D., Senior Vice President and Oncology Therapeutic Area Head, Astellas.

'We're pleased that PADCEV provided meaningful clinical benefit to a group of patients who historically have very few options and may choose not to pursue further treatment for the disease,' said Roger Dansey, M.D., Chief Medical Officer, Seagen.

The results are expected to be submitted to the U.S. Food and Drug Administration by the end of March as part of a supplemental biologics licensing application. EV-201 results will also be included in submissions to some global health authorities.

EV-201 Cohort 2 Trial Results

In cohort 2 of the dual-cohort trial, 52 percent of patients who received PADCEV had an objective response (46/89); (95 percent CI: 40.8, 62.4) per blinded independent central review (the primary endpoint), with 20 percent of patients (18/89) experiencing a complete response and 31 percent of patients experiencing a partial response (28/89).

In the trial's secondary endpoints, duration of response lasted a median of 10.9 months (95 percent CI: 5.8, NR). Patients lived a median of 5.8 months without cancer progression (progression-free survival) (95 percent CI: 5.0, 8.3), and had a median overall survival of 14.7 months (95 percent CI: 10.5,18.2).

Grade 3 or greater treatment-related AEs of interest included skin reactions (17 percent), peripheral neuropathy (8 percent) and hyperglycemia (6 percent). Four deaths were reported as treatment-related by investigators in patients age 75 years and older with multiple comorbidities.

About Urothelial Cancer

Urothelial cancer is the most common type of bladder cancer (90 percent of cases) and can also be found in the renal pelvis (where urine collects inside the kidney), ureter (tube that connects the kidneys to the bladder) and urethra.1 Globally, approximately 549,000 new cases of bladder cancer and 200,000 deaths are reported annually.

About the EV-201 Trial

The EV-201 trial (NCT03219333) is a single-arm, pivotal phase 2 clinical trial of enfortumab vedotin for patients with locally advanced or metastatic urothelial cancer who have been previously treated with a PD-1 or PD-L1 inhibitor, including those who have also been treated with a platinum containing chemotherapy (cohort 1) and those who have not received a platinum-containing chemotherapy in this setting and who are ineligible for cisplatin (cohort 2). The trial enrolled 128 patients in cohort 1 and 91 patients in cohort 2 at multiple centers internationally.

The primary endpoint is confirmed objective response rate per blinded independent central review. Secondary endpoints include assessments of duration of response, disease control rate, progression-free survival, overall survival, safety and tolerability.

About PADCEV (enfortumab vedotin-ejfv)

PADCEV was approved by the U.S. Food and Drug Administration (FDA) in December 2019 and is indicated for the treatment of adult patients with locally advanced or metastatic urothelial cancer who have previously received a programmed death receptor-1 (PD-1) or programmed death-ligand 1 (PD-L1) inhibitor and a platinum-containing chemotherapy before (neoadjuvant) or after (adjuvant) surgery or in a locally advanced or metastatic setting. PADCEV was approved under the FDA's Accelerated Approval Program based on tumor response rate. Continued approval for this indication may be contingent upon verification and description of clinical benefit in confirmatory trials.

PADCEV is a first-in-class antibody-drug conjugate (ADC) that is directed against Nectin-4, a protein located on the surface of cells and highly expressed in bladder cancer.3,4 Nonclinical data suggest the anticancer activity of PADCEV is due to its binding to Nectin-4 expressing cells followed by the internalization and release of the anti-tumor agent monomethyl auristatin E (MMAE) into the cell, which result in the cell not reproducing (cell cycle arrest) and in programmed cell death (apoptosis).4 PADCEV is co-developed by Astellas and Seagen.

About Astellas

Astellas Pharma Inc. is a pharmaceutical company conducting business in more than 70 countries around the world. We are promoting the Focus Area Approach that is designed to identify opportunities for the continuous creation of new drugs to address diseases with high unmet medical needs by focusing on Biology and Modality. Furthermore, we are also looking beyond our foundational Rx focus to create Rx+ healthcare solutions that combine our expertise and knowledge with cutting-edge technology in different fields of external partners. Through these efforts, Astellas stands on the forefront of healthcare change to turn innovative science into value for patients.

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.

About the Astellas and Seagen Collaboration

Astellas and Seagen are co-developing enfortumab vedotin under a collaboration that was entered into in 2007 and expanded in 2009.

Astellas Cautionary Notes

In this press release, statements made with respect to current plans, estimates, strategies and beliefs and other statements that are not historical facts are forward-looking statements about the future performance of Astellas. These statements are based on management's current assumptions and beliefs in light of the information currently available to it and involve known and unknown risks and uncertainties. A number of factors could cause actual results to differ materially from those discussed in the forward-looking statements. Such factors include, but are not limited to: (i) changes in general economic conditions and in laws and regulations, relating to pharmaceutical markets, (ii) currency exchange rate fluctuations, (iii) delays in new product launches, (iv) the inability of Astellas to market existing and new products effectively, (v) the inability of Astellas to continue to effectively research and develop products accepted by customers in highly competitive markets, and (vi) infringements of Astellas' intellectual property rights by third parties.

Information about pharmaceutical products (including products currently in development), which is included in this press release is not intended to constitute an advertisement or medical advice.

Seagen Forward Looking Statements

Certain statements made in this press release are forward looking, such as those, among others, relating to the submission of data from cohort 2 of the EV-201 trial for presentation at an upcoming scientific congress; intended regulatory actions, including plans to submit a supplemental biologics licensing application to the FDA and to make submissions to global health authorities and the therapeutic potential of PADCEV, including its efficacy, safety and therapeutic uses. 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 possibilities that we may experience delays in the submission of results to the FDA; that the results from cohort 2 of the EV-201 trial may not be support any approvals by regulatory authorities; that, even if PADCEV receives an additional approval in the U.S. or an approval in any global registrations, the product labeling may not be as broad or desirable as anticipated; that ongoing and subsequent clinical trials may fail to establish sufficient efficacy; that adverse events or safety signals may occur 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, 2020 filed with the Securities and Exchange Commission. Seagen disclaims any intention or obligation to update or revise any forwardlooking statements, whether as a result of new information, future events or otherwise, except as required by law.


Chris Goldrick

Tel: (847) 224-3014

Email: chris.goldrick@astellas.com

(C) 2021 Electronic News Publishing, source ENP Newswire

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