1区 · 医学
Article
作者: Ferrer, Cristina ; Murias, Laura ; Bockorny, Bruno ; Fabre, Myriam ; Simon, Laureano ; Perea, Sofia ; Richter, Wolfgang ; Kontermann, Roland E. ; López-Casas, Pedro P. ; Hidalgo, Manuel ; Seifert, Oliver ; Eisler, Stephan A. ; Abbas, Muhammad ; Vivanco, María dM. ; Domínguez-Hormaetxe, Saioa ; Pfizenmaier, Klaus ; Lee, So Young
Purpose::The tumor microenvironment plays a key role in cancer development and progression and is involved in resistance to chemo- and immunotherapy. Cancer-associated fibroblast expressing fibroblast-activating protein α (FAPα) is one of the predominant stroma cell types and is involved in resistance to immunotherapy.
Experimental Design::We generated OMTX705, a novel antibody–drug conjugate from a humanized anti-FAP antibody linked to a new cytolysin. Here, we studied its antineoplastic activity in vitro and in preclinical mouse models alone and in combination with chemotherapy as well as immunotherapy in PD-1–resistant tumors.
Results::In Avatar models, OMTX705 showed a 100% tumor growth inhibition and prolonged tumor regressions as single agent and in combination with chemotherapy. Treatment rechallenge following treatment discontinuation induced additional tumor regression, suggesting lack of treatment resistance. In a mouse model with a humanized immune system resistant to PD-1 inhibition, OMTX705 increased tumor infiltration by CD8+ T cells, induced complete regressions, and delayed tumor recurrence.
Conclusions::These data suggest that FAP targeting with OMTX705 represents a novel and potent strategy for cancer treatment, including tumors resistant to immunotherapy, and support its clinical development.