Efficacy and safety of finotonlimab plus docetaxel vs. docetaxel in previously treated advanced squamous cell non-small-cell lung cancer: a randomized, double-blinded, phase III trial

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Background: Lung cancer is the most common cancer in the world, and non-small cell lung cancer (NSCLC) constitutes about 80-85%. In this phase III trial, we evaluate the efficacy and safety of anti-programmed cell death-1 (PD-1) monoclonal antibody (SCT-I10A) plus docetaxel compared to docetaxel in patients with previously treated advanced squamous cell NSCLC (sqNSCLC). Methods: Patients were randomized 2:1 to finotonlimab plus docetaxel group (finotonlimab plus docetaxel) and docetaxel group (placebo plus docetaxel) for up to 6 cycles, followed by maintenance monotherapy with finotonlimab/placebo. The primary endpoint was overall survival (OS). Secondary endpoints included objective response rate (ORR), disease control rate (DCR), duration of response (DoR), progression-free survival (PFS) as well as assessments of safety and immunogenicity. Results: There were 188 eligible patients enrolled (finotonlimab plus docetaxel group: n=126; docetaxel group: n=62). Median OS (mOS) was 17.1 months [95% confidence interval (CI): 11.2, 20.0] in the finotonlimab plus docetaxel group and 10.4 months (95% CI: 5.9, 14.0) in the control group. Hazard ratio (HR) was 0.66 (95% CI: 0.45, 0.96; P=0.03). Median PFS (mPFS) was 4.2 months (95% CI: 3.3, 6.9) and 2.9 months (95% CI: 1.5, 3.8) respectively in the finotonlimab plus docetaxel group and control group. Patients in the finotonlimab plus docetaxel group achieved an ORR of 27.0% (95% CI: 19.5%, 35.6%), which was significantly higher than the 3.2% (95% CI: 0.4%, 11.2%) in the control group. The DCR was 68.3% (95% CI: 59.4%, 76.3%) in the finotonlimab plus docetaxel group and 56.5% (95% CI: 43.3%, 69.0%) in the control group. Treatment-related adverse events (TRAEs) occurred in 91.3% (115/126) patients of finotonlimab plus docetaxel group and 87.1% (54/62) patients of control group. Conclusions: SCT-I10A combined with docetaxel significantly prolonged OS and improved clinical outcomes in patients with treated advanced sqNSCLC compared to docetaxel, without increasing safety risk. Trial Registration: NCT04171284, ClinicalTrials.gov.

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