Following important regulatory news, AstraZeneca PLC (NASDAQ: AZN) started to exhibit upward momentum in pre-market trading. AZN shares were worth $74.36 as of the most recent pre-market check, which is a 3.52% increase.
The surge comes after the company announced that its supplemental biologics license application (sBLA) for IMFINZI (durvalumab) was accepted by the U.S. Food and Drug Administration (FDA) and that it was given priority review for the treatment of patients with gastric and gastroesophageal junction (GEJ) cancers that are resectable, early-stage, and locally advanced (Stages II, III, IVA).
FDA Designation of Breakthrough Therapy and Priority Review
Therapies that have the potential to significantly enhance safety, effectiveness, or patient outcomes above current therapy alternatives are given Priority Review by the FDA. The fourth quarter of 2025 is the target date for the regulatory decision under the Prescription Drug User Fee Act (PDUFA).
In order to meet important unmet needs in the treatment of gastric cancer, IMFINZI has also obtained Breakthrough Therapy Designation (BTD) for this indication, accelerating the development and review process.
Results of Clinical Trials Show Great Efficacy
Data from the MATTERHORN Phase III study, which was presented at the 2025 American Society of Clinical Oncology (ASCO) Annual Meeting and published in The New England Journal of Medicine, provide support for the sBLA filing. The trial assessed an IMFINZI and chemotherapy perioperative regimen before surgery, followed by IMFINZI treatment after surgery.
When compared to chemotherapy alone, the risk of illness progression, recurrence, or mortality was reduced by 29%, according to interim analysis. With 24-month EFS rates of 67.4% vs 58.5%, respectively, the IMFINZI arm had not yet achieved the estimated median event-free survival (EFS), but the control arm had done so after 32.8 months.
International Regulatory Reviews Are In Progress
One of the primary causes of cancer death and the fifth most frequent cancer globally is still gastric cancer. An estimated 6,500 Americans had treatment for locally progressed or early-stage gastric or GEJ malignancies in 2024. IMFINZI is the only immunotherapy that exhibits a statistically significant survival advantage in this context, according to the positive results.
Potentially opening the door to a new standard of care in the treatment of stomach cancer, regulatory applications for the medication are also being reviewed in the European Union, Japan, and other international markets.

