On 1 May, 2017, the US Food and Drug Administration (FDA) granted accelerated approval to durvalumab (IMFINZI, AstraZeneca UK Limited) for the treatment of patients with locally advanced or metastatic urothelial carcinoma who have disease progression during or following platinum-containing chemotherapy or who have disease progression within 12 months of neoadjuvant or adjuvant treatment with platinum-containing chemotherapy.
The FDA also approved the VENTANA PD-L1 (SP263) Assay (Ventana Medical Systems, Inc.) as a complementary diagnostic for the assessment of the PD-L1 protein in formalin-fixed, paraffin-embedded urothelial carcinoma tissue.
Approval was based on one single-arm trial of 182 patients with locally advanced or metastatic urothelial carcinoma whose disease progressed after prior platinum-containing chemotherapy.
Durvalumab, 10 mg/kg intravenously, was administered every 2 weeks.
Confirmed objective response rate (ORR) as assessed by blinded independent central review per RECIST v1.1, was 17.0% (95% CI: 11.9, 23.3). At the data cutoff for the ORR analysis, median response duration was not reached (range: 0.9+ to 19.9+ months).
The ORR was also analyzed by PD-L1 expression status as measured by VENTANA PD-L1 (SP263) Assay. In the 182 patients, the confirmed ORR was 26.3% (95% CI: 17.8, 36.4) in 95 patients with a high PD-L1 score and 4.1% (95% CI: 0.9, 11.5) in 73 patients with a low or negative PD-L1 score.
The most common adverse reactions in at least 15% of patients were fatigue, musculoskeletal pain, constipation, decreased appetite, nausea, peripheral oedema, and urinary tract infection. Grade 3-4 adverse events were seen in 43% of patients. Infection and immune-related adverse events such as pneumonitis, hepatitis, colitis, thyroid disease, adrenal insufficiency, and diabetes were also seen with durvalumab.
The recommended dose of durvalumab is 10 mg/kg, administered as an intravenous infusion over 60 minutes every 2 weeks until disease progression or unacceptable toxicity.
Full prescribing information is available here.
The FDA granted this application accelerated approval, priority review, and Breakthrough Therapy Designation. As a condition of the accelerated approval, AstraZeneca is required to complete an ongoing clinical trial to confirm clinical benefit of durvalumab. FDA approved this application approximately 6 weeks ahead of the goal date.
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.