Data from Pharmawand - Curated by EPG Health - Date added 04 June 2019

Seattle Genetics, Inc. and Astellas Pharma Inc. announced that data from the first cohort of a pivotal phase II clinical trial known as EV 201 demonstrated that the investigational agent enfortumab vedotin rapidly shrank tumors in most patients, resulting in an objective response rate (ORR) of 44 percent (55/125; 95% Confidence Interval (CI): 35.1-53.2). Complete responses (CR) were observed in 12 percent of patients (15/125). The median duration of tumor response was 7.6 months (range 0.95-11.3+). This cohort was open to patients with locally advanced or metastatic urothelial cancer who had received previous treatment with a platinum-containing chemotherapy and a PD-1/L1 checkpoint inhibitor. Responses were similar in the subgroups of patients analyzed, including those who had the worst prognosis, such as patients who had three or more previous lines of therapy, patients with liver metastases, and those who had not responded to a PD-1/L1 inhibitor.

Treatment-related adverse events that occurred in 40 percent or more of patients were fatigue, alopecia, rash, decreased appetite, taste distortion, and peripheral neuropathy. The data will be featured in the official press program of the American Society of Clinical Oncology ( ASCO ) Annual Meeting and be presented as a Late-Breaking oral presentation (Abstract #LBA4505) and have been submitted for publication in a peer-reviewed journal.

Despite recent advances in treatment, approximately 80 percent of people do not respond to PD-1/L1 inhibitors, which are the standard of care after platinum-containing therapy has failed as an initial treatment for advanced disease.These patients have few treatment options and new therapies are urgently needed.

A global, randomized phase III confirmatory clinical trial (EV-301) is ongoing and is intended to support global registrations. Another trial (EV-103) is underway to evaluate enfortumab vedotin in earlier lines of treatment for patients with locally advanced or metastatic urothelial cancer, including in combination with pembrolizumab and/or platinum chemotherapy in newly diagnosed patients as well as patients who progressed from earlier-stage disease.


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