Claudin 6 (CLDN6) is overexpressed in several cancers with limited to no detectable expression observed in normal tissues, making it an ideal target for ADC development. CLDN6 is a transmembrane protein and member of a family of proteins important for cell-to-cell connectivity in normal tissues. CLDN6 expression normally occurs during embryonic and fetal development but not in adult tissues. Overexpression of CLDN6 occurs in specific malignancies and has been implicated in the pathogenesis of certain cancers including ovarian, non-small cell lung, endometrial, testicular malignancies. High expression correlates with shortened survival outcomes for patients with ovarian cancer.

CATALINA-2 is a global, randomized, open-label Phase 2 study of novel CLDN6-targeted ADC TORL-1-23 in women with CLDN6+ PROC who have received one to three prior lines of therapy. The primary endpoint is objective response rate (ORR) per RECIST v1.1 by blinded independent central review. Secondary endpoints consist of duration of response, ORR by investigator assessment, progression-free survival, overall survival and safety. Further details can be found at https://clinicaltrials.gov/study/NCT06690775.

TORL-1-23 has received Fast Track Designation from the U.S. Food and Drug Administration.