On September 24, 2024 Astellas Pharma Inc. (TSE:4503, President and CEO: Naoki Okamura, "Astellas") reported that Japan’s Ministry of Health, Labour and Welfare (MHLW) has approved PADCEV (enfortumab vedotin [genetical recombination]) with MSD’s KEYTRUDA (pembrolizumab [genetical recombination]) as a combination therapy for the first-line treatment of adult patients with radically unresectable urothelial carcinoma (Press release, Astellas, SEP 24, 2024, View Source,-Labour-and-Welfare-Approves-PADCEV-TM-enfortumab-vedotin-with-KEYTRUDA-R-pembrolizumab-for-First-Line-Treatment-of-Radically-Unresectable-Urothelial-Carcinoma [SID1234646833]). This is the first approved combination treatment for radically unresectable urothelial cancer in Japan to offer an alternative to platinum-containing chemotherapy, the current standard of care for first-line treatment.
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In Japan, bladder cancer is the 9th most common cancer, with over 34,500 new cases diagnosed and 11,000 deaths reported from the disease in 2022.3 Particularly poor outcomes are associated with the latter stages of the disease, with global five-year survival rates of 39% and 8% for locally advanced and metastatic urothelial cancer, respectively.4
The approval by the MHLW was supported by results from the Phase 3 EV-302 clinical trial (also known as KEYNOTE-A39) which explored the efficacy and safety of enfortumab vedotin in combination with pembrolizumab in patients with previously untreated locally advanced or metastatic urothelial cancer (la/mUC). Results showed that the treatment combination resulted in a median overall survival 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 progression-free survival 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). The safety results in EV-302 are consistent with those previously reported for this combination in EV-103 in cisplatin-ineligible patients with la/mUC. The most common (≥3%) Grade 3 or higher adverse events (AEs) related to treatment with enfortumab vedotin in combination with pembrolizumab were maculo-papular rash, hyperglycemia, neutropenia, peripheral sensory neuropathy, diarrhea, and anemia. No new safety issues were identified. 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) (Free ESMO Whitepaper) Congress and published in the New England Journal of Medicine.1
Ahsan Arozullah, M.D., M.P.H., Senior Vice President, Head of Oncology Development, Astellas
"Today’s approval by Japan’s MHLW expands the benefits of treatment with enfortumab vedotin in combination with pembrolizumab to patients living with radically unresectable urothelial carcinoma in Japan. These patients will now have an alternative to platinum-containing chemotherapy to treat this devastating disease, helping to improve patient outcomes, extend lives and give further hope to the patients and families that we serve."
In addition to this latest approval, enfortumab vedotin in combination with pembrolizumab was approved by the European Commission in August 2024 for the first-line treatment of adult patients with unresectable or metastatic urothelial cancer, who are eligible for platinum-containing chemotherapy. Furthermore, in December 2023, the U.S. Food and Drug Administration approved the use of the combination therapy for adult patients with locally advanced or metastatic urothelial cancer.
Astellas has already reflected the impact from the approval for enfortumab vedotin in Japan in its financial forecast for the current fiscal year ending March 31, 2025.
About EV-302
The EV-302 trial is an open-label, randomized, controlled Phase 3 study, evaluating enfortumab vedotin in combination with pembrolizumab versus platinum-containing chemotherapy in patients with previously untreated la/mUC. The study enrolled 886 patients with previously untreated la/mUC who were eligible for cisplatin- or carboplatin-containing chemotherapy regardless of PD-L1 status. Patients were randomized 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 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) (Free ESMO Whitepaper) Congress and published in the New England Journal of Medicine.1
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.5 Urothelial cancer accounts for 90% of global bladder cancers and can also be found in the renal pelvis, ureter, and urethra.6,7 If bladder cancer has spread to surrounding organs or muscles, it is called locally advanced disease.8 If the cancer has spread to other parts of the body, it is called metastatic disease.9 Globally, approximately 12% of cases are locally advanced or metastatic urothelial cancer at diagnosis.10
About PADCEV (enfortumab vedotin [genetical recombination])
PADCEV (enfortumab vedotin [genetical recombination]) 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.11,12 Non-clinical data suggest the anticancer activity of enfortumab vedotin 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).11
PADCEV is indicated in Japan as monotherapy for the treatment of adult patients with radically unresectable urothelial carcinoma that has progressed after anti-cancer chemotherapy, and in combination with KEYTRUDA (pembrolizumab) for the first-line treatment of adult patients with radically unresectable urothelial carcinoma.13
Ongoing Investigational Trials
EV-302 (NCT04223856) is an open-label, randomized, 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 PADCEV, please see the Package Insert.