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AstraZeneca’s tremelimumab accepted under Priority Review in the US

Susan Galbraith

AstraZeneca’s Biologics License Application (BLA) for tremelimumab has been accepted for Priority Review in the US, supporting the indication of a single priming dose of the anti-CTLA4 antibody added to Imfinzi for the treatment of patients with unresectable hepatocellular carcinoma (HCC).

A supplemental BLA (sBLA) has also been submitted for Imfinzi in this indication. This novel dose and schedule of the combination is called the STRIDE regimen (Single Tremelimumab Regular Interval Durvalumab). The Prescription Drug User Fee Act date, the Food and Drug Administration (FDA) action date for their regulatory decision, is during the fourth quarter of 2022 following the use of a priority review voucher.

“The HIMALAYA Phase III trial showed an unprecedented three-year overall survival in this setting with a single priming dose of tremelimumab added to Imfinzi, highlighting the potential for this regimen to improve longer-term survival outcomes. Patients with advanced liver cancer are in great need of new treatment options, and we are working closely with the FDA to bring this novel approach to patients in the US as soon as possible,” says Susan Galbraith, Executive Vice President, Oncology R&D, AstraZeneca.

HIMALAYA trial

The BLA for tremelimumab and sBLA for Imfinzi are based on final results from the HIMALAYA Phase III trial presented at the 2022 American Society of Clinical Oncology Gastrointestinal Cancers Symposium.

In this trial, patients treated with the STRIDE regimen experienced a 22% reduction in the risk of death versus sorafenib (based on a hazard ratio [HR] of 0.78, 96.02% confidence interval [CI] 0.65-0.93; p=0.0035). Nearly one in three (31%) patients were still alive at three years versus one in five (20%) for sorafenib.

The safety profiles of the STRIDE regimen and for Imfinzi alone were consistent with the known profiles of each medicine, and no new safety signals were identified.

Orphan Drug Designation

Imfinzi and tremelimumab were granted Orphan Drug Designation in the US for the treatment of HCC in January 2020.

As part of its extensive clinical development programme in gastrointestinal (GI) cancers, AstraZeneca is further assessing Imfinzi across multiple liver cancer settings, including locoregional HCC (EMERALD-1, EMERALD-3) and adjuvant HCC (EMERALD-2), it states.

Photo of Susan Galbraith: AstraZeneca