Kronos Bio (NASDAQ: KRON) has dosed the first patient in an expansion cohort of its KB-0742 clinical trial, focusing on platinum-resistant high-grade serous ovarian cancer (HGSOC). The trial uses an 80mg dose on a four-days-on, three-days-off schedule, which cleared the dose escalation phase. This dosing regimen is expected to provide a 1.8-fold increase in AUC compared to the previous 60mg three-days-on, four-days-off schedule.
KB-0742 has shown a favorable safety profile in over 100 patients, with no grade 3 or 4 neutropenia observed. The company plans to provide an efficacy update on this expansion cohort in the first half of 2025. HGSOC is particularly sensitive to CDK9 inhibition due to MYC amplification or overexpression and homologous recombination deficiencies, affecting a significant portion of ovarian cancer patients.