Bristol Myers Squibb and SystImmune have announced breakthrough therapy designation from the US Food and Drug Administration (FDA) for izalontamab brengitecan (iza-bren) to treat locally advanced or metastatic non-small cell lung cancer (NSCLC) with specific epidermal growth factor receptor mutations.

NSCLC represents 80% of lung cancer cases and is the leading cause of cancer-related mortality globally.

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This designation is intended for patients with EGFR exon 19 deletions or exon 21 L858R mutations whose disease has progressed after treatment with an EGFR tyrosine kinase inhibitor and platinum-based chemotherapy.

The bispecific antibody-drug conjugate is under development by China’s Biokin and is also being advanced by SystImmune and BMS under a licensing agreement for regions outside the country.

Iza-bren targets both EGFR and human epidermal growth factor receptor 3. It is designed to deliver a topoisomerase 1 inhibitor payload directly to cancer cells.

The decision was based on safety and efficacy data from the ongoing studies, BL-B01D1-101 and BL-B01D1-203, conducted in China, and the global BL-B01D1-LUNG-101 clinical trial carried out by SystImmune across Europe, the US and Japan.

Findings from these trials indicate that iza-bren may offer improved efficacy with a manageable safety profile in subjects with EGFR-mutant NSCLC.

SystImmune chief medical officer Dr Jonathan Cheng stated: “The FDA’s granting of breakthrough therapy designation underscores the potential of iza-bren to meaningfully improve clinical outcomes for patients with previously treated epidermal growth factor receptor mutation NSCLC.

“The data we have generated to date suggest that iza-bren could address a critical unmet need in patient care, and we look forward to working closely with the FDA to conduct the relevant clinical studies and seek regulatory approval.”

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