On June 16, 2020 Exicure, Inc. (NASDAQ: XCUR), the pioneer in gene regulatory and immunotherapeutic drugs utilizing spherical nucleic acid (SNA) constructs, reported the dosing of the first patient enrolled in the Phase 2 dose expansion stage of the cavrotolimod (AST-008) Phase 1b/2 clinical trial (ClinicalTrials.gov identifier: NCT03684785) (Press release, Exicure, JUN 16, 2020, View Source [SID1234561139]).
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"We believe this milestone marks an important step toward fulfilling an unmet treatment need for Merkel cell carcinoma patients who have been resistant to checkpoint inhibitor antibody therapy," said Dr. Douglas Feltner, Chief Medical Officer of Exicure.
The Phase 2 dose expansion stage includes two cohorts of patients with advanced or metastatic cancer: patients with Merkel cell carcinoma (MCC) and patients with cutaneous squamous cell carcinoma (CSCC). MCC is a rare, aggressive skin cancer considered more deadly than melanoma. Risk factors for MCC include sun exposure and a weakened immune system. Advanced or metastatic CSCC is an uncommon form of skin cancer associated with significant morbidity and mortality.
The dose expansion stage is designed to assess the anti-tumor response rate of cavrotolimod plus checkpoint inhibitor treatment, the safety and tolerability of the combination, and drug pharmacodynamics and pharmacokinetics. Patients enrolled in the dose expansion cohorts must have recently documented tumor progression despite anti-PD-1 or anti-PD-L1 antibody monotherapy.
About Cavrotolimod (AST-008)
Cavrotolimod (AST-008) is an SNA consisting of toll-like receptor 9 agonists designed for immuno-oncology applications. In December 2019, Exicure announced preliminary results from the Phase 1b stage of the clinical trial including potential signs of anti-tumor activity with cavrotolimod in combination with pembrolizumab in patients with MCC. To date, 20 patients in the Phase 1b stage of the clinical trial have been dosed, and no cavrotolimod-related serious adverse event or dose-limiting toxicity has been reported. The most commonly reported adverse events were injection site reactions and flu-like
symptoms. In the second quarter of 2020, Exicure initiated Phase 2 dose expansion cohorts of intratumoral cavrotolimod in combination with approved checkpoint inhibitors to treat two cohorts of patients with advanced or metastatic MCC or CSCC. Each cohort is expected to enroll up to 29 patients whose tumors have progressed on anti-PD-1/PD-L1, or programmed cell death protein 1/programmed death-ligand 1, antibody monotherapy.