New first-line treatment of Advanced Bladder (Urothelial) Cancer PADCEVTM (enfortumab vedotin) authorised in combination with KEYTRUDA® (pembrolizumab)

New first-line treatment of Advanced Bladder (Urothelial) Cancer PADCEVTM (enfortumab vedotin) authorised in combination with KEYTRUDA® (pembrolizumab)

- The landmark EV-302 trial demonstrated clincally & statistically significant median overall & progression free survival versus platinum-containing chemotherapy.1

- Platinum-containing chemotherapy has been the first line standard of care in this setting for almost 40 years1

Addlestone, UK, October 9, 2024 – Astellas Pharma Ltd. today announced that the Medicines and Healthcare products Regulatory Agency (MHRA) has granted authorisation for PADCEVTM (enfortumab vedotin, an antibody-drug conjugate [ADC]) in combination with KEYTRUDA® (pembrolizumab, a PD-1 inhibitor) for the first-line treatment of adult patients with unresectable or metastatic urothelial cancer, who are eligible for platinum-containing chemotherapy.2

The indication is based on results of the Phase 3 EV-302 clinical trial (also known as KEYNOTE-A39). The Phase 3 clinical trial showed that enfortumab vedotin in combination with pembrolizumab nearly doubled median overall survival (OS) and signficantly extended progression-free survival (PFS) compared to platinum-containing chemotherapy.1

“The foundations of advanced bladder cancer treatment haven’t changed since the 1980s,” said Professor. Thomas Powles, Director of Barts Cancer Institute Biomedical Research Centre (QMUL), UK and primary investigator on the EV-302 trial, “to see EV-302 move from clinical trial to licensed indication within a year shows the strength of those results and the potential benefit to people with advanced bladder cancer.”

Advanced bladder cancer has a poor prognosis compared to other forms of cancer. Diagnosis often comes late, with many patients presenting with advanced or metastatic disease where survival outcomes are particularly poor. Only 10% of patients with stage 4 bladder cancer survive for more than 5 years after diagnosis.3

“Behind the news today is a tremendous amount of hard work and collaboration between the medical community and pharma. said Dr Timir Patel, Medical Director, Astellas, UK “it’s testament to what we can achieve together and I look forward to doctors across the UK being able to access this combination of medicines for their patients.”

The Phase 3 EV-302 clinical trial explored the efficacy and safety of enfortumab vedotin in combination with pembrolizumab in patients with previously untreated unresectable locally advanced or metastatic urothelial cancer (la/mUC). Results showed that the treatment combination resulted in a median OS of 31.5 months (95% CI: 25.4-NR) compared to 16.1 months (95% CI: 13.9-18.3) with platinum-containing chemotherapy, representing a 53% reduction in risk of death (Hazard Ratio [HR]=0.47; 95% Confidence Interval [CI]: 0.38-0.58; P<0.00001). The median PFS of 12.5 months (95% CI: 10.4-16.6) with the combination compared to 6.3 months (95% CI: 6.2-6.5) with chemotherapy represents a 55% reduction in the risk of cancer progression or death (HR=0.45; 95% CI: (0.38-0.54); P<0.00001). During the EV-302 trial, approximately 30% of patients completed treatment with chemotherapy and then went on to receive maintenance therapy with avelumab, a PD-L1 inhibitor, which is reflective of current real world clinical practice.1 Results were presented at the 2023 European Society for Medical Oncology (ESMO) Congress and published in the New England Journal of Medicine.

The approval follows the December 2023 and August 2024 approval of enfortumab vedotin in combination with pembrolizumab for the treatment of adult patients with la/mUC by the U.S. Food and Drug Administration (FDA) and European Commission respectively.4,5 The indication for Great Britain was issued via the European Commission Reliance Procedure Process following European Commission authorisation of enfortumab vedotin.

Astellas has already reflected the impact from this result in its financial forecast for the current fiscal year ending March 31, 2025.

About EV-302

EV-302 is an ongoing, open-label, randomised, controlled Phase 3 trial, evaluating enfortumab vedotin in combination with pembrolizumab versus platinum-containing chemotherapy in patients with previously untreated la/mUC. The trial enrolled 886 patients with previously untreated la/mUC who were eligible for cisplatin- or carboplatin-containing chemotherapy regardless of PD-L1 status. Patients were randomised to receive either enfortumab vedotin in combination with pembrolizumab or platinum-containing chemotherapy. The dual primary endpoints of this trial are OS and PFS per RECIST v1.1 by blinded independent central review (BICR). Select secondary endpoints include ORR per RECIST v1.1 by BICR, DOR per RECIST v1.1 by BICR, and safety.1

The most common (≥3%) Grade 3 or higher adverse events related to treatment with enfortumab vedotin and pembrolizumab were maculo-papular rash, hyperglycemia, neutropenia, peripheral sensory neuropathy, diarrhea, and anemia. The safety results in EV-302 are consistent with those previously reported with this combination in EV-103 in cisplatin-ineligible patients with la/mUC. No new safety issues were identified.1

The EV-302 trial is part of an extensive clinical program evaluating this combination in multiple stages of urothelial cancer and other solid tumors. Findings from EV-302 were presented at the 2023 European Society for Medical Oncology (ESMO) Congress and were published in the New England Journal of Medicine.

For more information on the EV-302 trial (NCT04223856) go to https://clinicaltrials.gov.

About Bladder and Urothelial Cancer Urothelial cancer, or bladder cancer, begins in the urothelial cells, which line the urethra, bladder, ureters, renal pelvis, and some other organs.6 Urothelial cancer accounts for 90% of all bladder cancers and can also be found in the renal pelvis, ureter, and urethra.7,8 If cancer is not able to be treated with surgery, it is called unresectable.9 If cancer has spread to surrounding organs or muscles, it is called locally advanced disease.10 If cancer has spread to other parts of the body, it is called metastatic disease.11

Approximately 12% of cases are unresectable locally advanced or metastatic urothelial cancer at diagnosis.12

Bladder cancer is diagnosed in approximately 614,000 people and causes 220,000 deaths worldwide each year.13 Continuous treatment and surveillance makes bladder cancer one of the most expensive cancer types over the lifetime of a patient and, in fact, have been shown to be the costliest cancer when compared to other malignancies.14

About PADCEVTM (enfortumab vedotin)

PADCEV (enfortumab vedotin) 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.4,15 Nonclinical data suggest the anticancer activity of enfortumab vedotin is due to its binding to Nectin-4-expressing cells, followed by the internalisation 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 indicated in Great Britain as monotherapy for the treatment of adult patients with locally advanced or metastatic urothelial cancer who have previously received a platinum-containing chemotherapy and a programmed death receptor-1 or programmed death-ligand 1 inhibitor, and in combination with KEYTRUDA® (pembrolizumab) for the first-line treatment of adult patients with unresectable or metastatic urothelial cancer, who are eligible for platinum-containing chemotherapy.2,4

Ongoing Investigational Trials

EV-302 (NCT04223856) is an open-label, randomised, controlled Phase 3 trial, evaluating enfortumab vedotin in combination with pembrolizumab versus platinum-containing chemotherapy in patients with previously untreated locally advanced or metastatic urothelial cancer (la/mUC) who were eligible for cisplatin- or carboplatin-containing chemotherapy regardless of PD-L1 status.

EV-103 (NCT03288545) is an ongoing, multi-cohort, open-label, multicenter Phase 1b/2 trial investigating enfortumab vedotin alone or in combination with pembrolizumab and/or chemotherapy in first- or second-line settings in patients with la/mUC and in patients with muscle-invasive bladder cancer (MIBC).

Enfortumab vedotin in combination with pembrolizumab is being investigated in an extensive program in multiple stages of urothelial cancer, including two Phase 3 clinical trials in MIBC in EV-304 (NCT04700124, also known as KEYNOTE-B15) and EV-303 (NCT03924895, also known as KEYNOTE-905). The use of enfortumab vedotin in combination with pembrolizumab in second-line urothelial cancer and MIBC has not been proven safe or effective.

EV-203 (NCT04995419) is a Phase 2, multicenter, single-arm bridging trial in China designed to evaluate the efficacy, safety, and pharmacokinetic performance of enfortumab vedotin as treatment for patients in China. A total of 40 patients were enrolled in the trial.

EV-104 (NCT05014139) is a Phase 1 trial exploring enfortumab vedotin in patients with non-muscle invasive bladder cancer (NMIBC). The trial will be conducted in two-parts, assessing dose escalation and dose expansion with enfortumab vedotin when administered intravesically as a monotherapy.

EV-202 (NCT04225117) is an ongoing, multi-cohort, open-label, multicenter Phase 2 trial investigating enfortumab vedotin alone in patients with previously treated advanced solid tumors. This trial also has a cohort that is investigating enfortumab vedotin in combination with pembrolizumab in patients with previously untreated recurrent / metastatic head and neck squamous cell carcinoma.

Important Safety Information

For Important Safety Information for enfortumab vedotin please see the full Summary of Product Characteristics at: https://www.ema.europa.eu/en/documents/product-information/padcev-epar-product-information_en.pdf

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. For more information, please visit our website at https://www.astellas.com/en.

About the Astellas, Pfizer and Merck Collaboration

Astellas and Pfizer have a clinical collaboration agreement with Merck to evaluate the combination of Astellas’ and Pfizer’s PADCEV™ (enfortumab vedotin) and Merck’s KEYTRUDA® (pembrolizumab) in patients with previously untreated metastatic urothelial cancer. KEYTRUDA is a registered trademark of Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc., Rahway, NJ, USA (known as MSD outside of the United States and Canada).

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.

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Contacts for inquiries or additional information:

Astellas Contacts:

Hugh Adams

07342 078599

Hugh.adams@astellas.com

References 1 Powles T, et al. Enfortumab vedotin and pembrolizumab in untreated advanced urothelial cancer. N Engl J Med. 2024;390:875-888.

2 PADCEV Summary of Product Characteristics. Great Britain Available at: https://www.medicines.org.uk/emc/search?q=padcev

3 Bladder Cancer UK, survival rates for Bladder Cancer

4 U.S. Food & Drug Administration. FDA approves enfortumab vedotin-ejfv with pembrolizumab for locally advanced or metastatic urothelial cancer. Available at: https://www.fda.gov/drugs/resources-information-approved-drugs/fda-approves-enfortumab-vedotin-ejfv-pembrolizumab-locally-advanced-or-metastatic-urothelial-cancer. Last accessed: August 2024.

5 European Medicines Agency. PADCEV EMA SmPC. Available at: https://www.ema.europa.eu/en/documents/product-information/padcev-epar-product-information_en.pdf. Last accessed: August 2024

6 National Cancer Institute. What is bladder cancer? (February 2023) Available at: https://www.cancer.gov/types/bladder. Last accessed: August 2024

7 Leow JJ, et al. Optimal management of upper tract urothelial carcinoma: Current perspectives. Onco Targets Ther. 2020;13:1-15.

8 Petros FG. Epidemiology, clinical presentation, and evaluation of upper-tract urothelial carcinoma. Transl Androl Urol. 2020;9(4):1794-8.

9 National Cancer Institute. NCI dictionary of cancer terms: Unresectable. Available at: https://www.cancer.gov/publications/dictionaries/cancer-terms/def/unresectable. Last accessed: August 2024

10 National Cancer Institute. NCI dictionary of cancer terms: Locally advanced cancer. Available at: https://www.cancer.gov/publications/dictionaries/cancer-terms/def/locally-advanced-cancer. Last accessed: August 2024

11 American Cancer Society. If you have bladder cancer. (March 2024). Available at: https://www.cancer.org/cancer/types/bladder-cancer/if-you-have-bladder-cancer.html. Last accessed: August 2024

12 National Cancer Institute. Cancer stat facts: bladder cancer. Available at: https://seer.cancer.gov/statfacts/html/urinb.html. Last accessed: August 2024

13 International Agency for Research on Cancer. Global Cancer Observatory. Bladder Factsheet. Available at: https://gco.iarc.fr/today/data/factsheets/cancers/30-Bladder-fact-sheet.pdf. Last accessed: August 2024

14 Aly A, et al. The Real-World Lifetime Economic Burden of Urothelial Carcinoma by Stage at Diagnosis. J Clin Pathw. 2020;6(4):51-60.

15 Challita-Eid PM, et al. Enfortumab vedotin antibody-drug conjugate targeting nectin-4 is a highly potent therapeutic agent in multiple preclinical cancer models. Cancer Res. 2016;76(10):3003-13.