On 15 December 2023, the US Food and Drug Administration (FDA) approved enfortumab vedotin-ejfv (Padcev, Astellas Pharma) in combination with pembrolizumab (Keytruda, Merck) for patients with locally advanced or metastatic urothelial cancer (la/mUC). FDA previously granted accelerated approval to this combination for patients with la/mUC who are ineligible for cisplatin-containing chemotherapy.
Efficacy was evaluated in EV-302/KN-A39 (NCT04223856), an open-label, randomised study of 886 patients with la/mUC and no prior systemic therapy for advanced disease. Patients were randomised 1:1 to receive either enfortumab vedotin-ejfv with pembrolizumab or platinum-based chemotherapy (gemcitabine with either cisplatin or carboplatin). Randomisation was stratified by cisplatin eligibility, PD-L1 expression, and presence of liver metastases.
The major efficacy outcome measures were overall survival (OS) and progression-free survival (PFS) as assessed by blinded independent central review.
Statistically significant improvements in both OS and PFS were demonstrated for enfortumab vedotin-ejfv with pembrolizumab compared with platinum-based chemotherapy. Median OS was 31.5 months (95% confidence interval [CI] 25.4, not estimable) for patients who received enfortumab vedotin-ejfv with pembrolizumab and 16.1 months (95% CI 13.9, 18.3) for those who received platinum-based chemotherapy (hazard ratio [HR] 0.47, 95% CI 0.38, 0.58; p-value < 0.0001). Median PFS was 12.5 months (95% CI 10.4, 16.6) for patients who received enfortumab vedotin-ejfv with pembrolizumab and 6.3 months (95% CI 6.2, 6.5) for those who received platinum-based chemotherapy (HR 0.45, 95% CI 0.38, 0.54; p-value < 0.0001).
The most common (≥20%) adverse reactions, including laboratory abnormalities, in patients receiving enfortumab vedotin-ejfv with pembrolizumab were increased aspartate aminotransferase, increased creatinine, rash, increased glucose, peripheral neuropathy, increased lipase, decreased lymphocytes, increased alanine aminotransferase, decreased haemoglobin, fatigue, decreased sodium, decreased phosphate, decreased albumin, pruritus, diarrhoea, alopecia, decreased weight, decreased appetite, increased urate, decreased neutrophils, decreased potassium, dry eye, nausea, constipation, increased potassium, dysgeusia, urinary tract infection, and decreased platelets.
The recommended enfortumab vedotin-ejfv dose when given with pembrolizumab is 1.25 mg/kg (up to a maximum of 125 mg for patients ≥ 100 kg) administered as an intravenous infusion over 30 minutes on Days 1 and 8 of a 21-day cycle until disease progression or unacceptable toxicity.
The recommended pembrolizumab dose when given with enfortumab vedotin-ejfv is 200 mg administered as an intravenous infusion every 3 weeks or 400 mg every 6 weeks until disease progression, unacceptable toxicity, or two years of therapy.
This review was conducted under Project Orbis, an initiative of the FDA Oncology Center of Excellence (OCE). Project Orbis provides a framework for concurrent submission and review of oncology drugs among international partners. For this review, FDA collaborated with the Australian Therapeutic Goods Administration and Health Canada.
This review used the Real-Time Oncology Review pilot programme, which streamlined data submission prior to the filing of the entire clinical application, and the Assessment Aid, a voluntary submission from the applicant to facilitate the FDA’s assessment. The FDA approved this application 5 months ahead of the FDA goal date.
This application was granted priority review and breakthrough designation.
Healthcare professionals should report all serious adverse events suspected to be associated with the use of any medicine and device to FDA’s MedWatch Reporting System.
For assistance with single-patient INDs for investigational oncology products, healthcare professionals may contact OCE’s Project Facilitate.
