Elevation Oncology announced new preclinical data demonstrating proof-of-concept for its differentiated HER3-ADC program. The data will be presented in a poster session at the American Association for Cancer Research Annual Meeting 2024, being held April 5-10 in San Diego, California. “We are pleased to share the first preclinical proof-of-concept data for our HER3-ADC program, reinforcing our commitment to advancing a portfolio of differentiated ADC-based therapies that may deliver better outcomes for patients,” said David Dornan, Ph.D., Chief Scientific Officer of Elevation Oncology. “With our HER3-ADC program, we set out to design a differentiated ADC which selectively binds to HER3 and is internalized to potentially attack HER3-expressing cancerous cells while minimizing systemic exposure. Preclinical data with our proof-of-concept HER3-ADC shows HER3-dependent cell killing and robust anti-tumor activity in vivo where HER3 is expressed at high levels. We look forward to nominating a development candidate from our HER3 program later this year and, subsequently, advancing our program closer to the clinic.” In a poster titled, “Therapeutic potential of a HER3 antibody-drug conjugate for the treatment of HER3-expressing cancers,” Elevation Oncology scientists presented in vitro and in vivo data of a seribantumab-based ADC for patients with HER3-expressing cancers. The data showed: HER3-ADC1 binding to cancer cells, endocytosis, MMAE release and inhibition of proliferation were dependent on HER3 expression. In cytotoxicity assays, HER3-ADC1 displayed HER3-dependent cell killing and outperformed a benchmark HER3-ADC with a deruxtecan payload, which is currently in clinical development. In a patient derived xenograft model of pancreatic cancer with high HER3 expression, HER3-ADC1 induced tumor regression, whereas an isotype-MMAE control and a benchmark HER3-ADC with a deruxtecan payload had only a modest effect.
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