Lund, Sweden – 12 September 2025 – Alligator Bioscience (Nasdaq Stockholm: ATORX), a clinical-stage biotechnology company developing tumor-directed immuno-oncology antibody drugs, announced that new preclinical results on its bispecific antibody ATOR-4066 will be presented today at the 9th International Cancer Immunotherapy Conference (CICON25), jointly organized in Utrecht, by the Cancer Research Institute (CRI), the European Network for Cancer Immunotherapy (ENCI), and other leading partners. The poster presentation (Poster #253) will take place during Poster Session B, from 12:00–15:00 CEST.
Summary of results
ATOR-4066 is a bispecific antibody designed to activate the immune system against CEACAM5-positive cancers, such as colorectal and gastric cancer. The new preclinical data, in the presentation “ATOR-4066, a Neo-X-Prime bispecific antibody targeting CD40 and CEACAM5, induces strong myeloid and T cell dependent tumor immunity and synergizes with PD-1 blockade,” show that ATOR-4066 strongly stimulates both myeloid cells and T cells inside tumors, leading to powerful and durable anti-tumor effects. In preclinical models, ATOR-4066 eliminated established tumors, showed limited immune activation outside the tumor, and demonstrated enhanced efficacy in combination with PD-1 blockade. These findings provide strong support for advancing ATOR-4066 into further development.
“We are excited to present these new preclinical findings demonstrating that ATOR-4066 triggers potent, dual-acting immune responses that translate into strong anti-tumor activity,” said Peter Ellmark, CSO at Alligator Bioscience. “ATOR-4066 represents the next step in our mission to develop best-in-class CD40-based therapies and builds directly on the promising clinical progress made with mitazalimab. The data to be presented at CICON25 support the continued development of ATOR-4066 as a differentiated bispecific candidate with potential to transform treatment outcomes in solid tumors.”
The poster will be made available on Alligator’s website, following the presentation.