A multicenter, open-label phase Ib/II study of cadonilimab (anti PD-1 and CTLA-4 bispecific antibody) monotherapy in previously treated advanced non-small-cell lung cancer (AK104-202 study)

Abstract

Purpose: This study aimed to evaluate the efficacy and safety of cadonilimab (anti PD-1 and CTLA-4 bispecific antibody) in patients with previously treated metastatic non-small-cell lung cancer (NSCLC).

Methods: In this multicenter, open-label, phase Ib/II study, patients with previously treated NSCLC were enrolled in three different cohorts: Cohort A, patients who had failed previous platinum-based doublet chemotherapy and were immunotherapy naïve; Cohort B, patients who had failed previous platinum-based doublet chemotherapy and had primary resistance to immunotherapy (IO); Cohort C, patients who had failed previous platinum-based doublet chemotherapy and had acquired resistance to IO. Eligible patients were given cadonilimab 6 mg/kg intravenously every 2 weeks. The primary endpoint was the objective response rate (ORR) according to Response Evaluation Criteria in Solid Tumors version 1.1.

Results: A total of 53 patients were enrolled: including 30 patients in cohort A, 7 in cohort B, and 16 in cohort C. ORR was 10% in cohort A, and there were no responder in cohort B and cohort C. Median overall survival was 19.61 (95% CI 11.30-NE) months, 4.93 (95% CI 1.97-NE) months and 13.16 (95% CI 6.18-NE) months in cohort A, B and C, respectively. Grade 3-4 treatment-related adverse events were reported in 6 (11.3 %) patients, including alanine aminotransferase increased (1.9%), rash (1.9%), chest discomfort (1.9%), hypercalcaemia (1.9%), anaemia (1.9%) and infusion related reaction (1.9%).

Conclusion: The study did not meet its primary endpoint. Cadonilimab demonstrated limited efficacy in patients with IO failure, especially in cases of primary resistance. However, cadonilimab might play a role as a second-line immune monotherapy after platinum-based doublet chemotherapy failure and IO naïve, as its efficacy is similar to other immune checkpoint inhibitors after first-line chemotherapy. Cadonilimab was well-tolerated with mild toxicity, making it a potential candidate for the combination strategy. Clinical trial number NCT04172454.

Keywords: Bispecific antibody; CTLA-4; Immune checkpoint inhibitor; Non-small-cell lung cancer; PD-1.