These results support the rationale to improve PK and anti-tumor efficacy of IL-15 by increasing local concentrations at the tumor site via conjugation to a TA-MUC1 binding mAb. The tumor-selective expression pattern of TA-MUC1, powerful immune activation and anti-tumor cytotoxicity, long serum half-life and tumor targeting properties, render GT-00AxIL15 a promising candidate for treatment of solid tumors with high medical need, e.g., ovarian, lung and breast cancer.
Safety evaluations demonstrated acceptable safety profile and no off-target toxicity in monkeys. These non-clinical data suggest the stability of linker in circulation but efficiently release the payload in tumors, and eventually, expanded the therapeutic window.Taken together, preclinical data suggest that YL201 could be a promising treatment strategy for B7-H3 positive cancer patients.