AstraZeneca’s Imfinzi (durvalumab) has been approved in the European Union for the 1st-line treatment of adults with extensive-stage small cell lung cancer (ES-SCLC) in combination with a choice of chemotherapies, etoposide plus either carboplatin or cisplatin.
SCLC is a highly aggressive, fast-growing form of lung cancer that typically recurs and progresses rapidly despite initial response to chemotherapy.
Based on positive results from the Phase III CASPIAN trial
The approval by the European Commission was based on positive results from the Phase III CASPIAN trial showing Imfinzi plus chemotherapy demonstrated a statistically significant and clinically meaningful overall survival (OS) benefit for the 1st-line treatment of patients with ES-SCLC. It follows the recommendation for approval by the Committee for Medicinal Products for Human Use of the European Medicines Agency in July 2020.
“Imfinzi plus chemotherapy is becoming a new global standard of care for patients with extensive-stage small cell lung cancer, and we are pleased to bring this option to patients in Europe who urgently need it. This is the first immunotherapy regimen to offer both a sustained survival benefit and an improved response rate, as well as a choice of chemotherapies and convenient dosing every four weeks during maintenance,” says Dave Fredrickson, Executive Vice President, Oncology Business Unit, AstraZeneca.
The CASPIAN trial
The CASPIAN trial met the primary endpoint of OS for Imfinzi plus chemotherapy in June 2019, reducing the risk of death by 27% versus chemotherapy alone (based on a hazard ratio [HR] of 0.73; 95% confidence interval [CI] 0.59-0.91; p=0.0047), with median OS of 13.0 months versus 10.3 months for chemotherapy alone. These results were published in The Lancet in 2019.3 Results also showed an increased confirmed objective response rate for Imfinzi plus chemotherapy (68% versus 58% for chemotherapy alone) and that Imfinzi added to chemotherapy delayed the time for disease symptoms to worsen.
An updated analysis recently showed sustained efficacy for Imfinzi plus chemotherapy after a median follow up of more than two years (OS HR: 0.75; 95% CI 0.62-0.91; nominal p=0.0032), with median OS of 12.9 months versus 10.5 months for chemotherapy alone. The safety and tolerability for Imfinzi plus chemotherapy were consistent with the known safety profile of these medicines. No patients tested positive for treatment-emergent anti-drug antibodies to Imfinzi.
The CASPIAN trial used a fixed dose of Imfinzi (1500mg) administered every three weeks for four cycles while in combination with chemotherapy and then every four weeks until disease progression.
Imfinzi in combination with etoposide and either carboplatin or cisplatin is also approved in the US, Japan and several other countries for the treatment of ES-SCLC in the 1st-line setting and is currently under regulatory review in other countries.
As part of a broad development programme, Imfinzi is also being tested following concurrent chemoradiation therapy in patients with limited-stage SCLC in the Phase III ADRIATIC trial.
Photo of Dave Fredrickson: AstraZeneca