Introduction: This study evaluated adebrelimab (a programmed death-ligand 1 antibody) plus nab-paclitaxel and carboplatin as perioperative treatment for resectable NSCLC.
Methods: Eligible patients had resectable stage II to III NSCLCs without driver gene. Patients received neoadjuvant treatment with three cycles of intravenous adebrelimab (20 mg/kg on day 1), nab-paclitaxel (100 mg/m on days 1, 8, and 15), and carboplatin (area under the curve 5 mg/mL per min on day 1), of each 21-day cycle before surgical resection, and followed by 16 cycles of adebrelimab (20 mg/kg on day 1 in 3 wk) adjuvant treatment. The primary end point was major pathologic response (MPR) per blinded independent pathologic review.
Results: A total of 37 patients were enrolled and received planned neoadjuvant therapy. There were 34 patients (91.9%) who underwent surgery. As of data cutoff on January 25, 2022, 19 of the 37 patients (51.4%, 95% confidence interval [CI]: 35.9-66.6) achieved MPR per blinded independent pathologic review and 11 patients (29.7%, 95% CI: 17.5-45.8) achieved pathologic complete response. Furthermore, 26 patients (70.3%, 95% CI: 54.2-82.5) had an objective response per Response Evaluation Criteria in Solid Tumors version 1.1. The 12-month event-free survival rate was 77.8% (95% CI: 54.1-90.3). In addition, 29 patients (78.4%) had grade greater than or equal to three treatment-related adverse events (AEs) and nine (24.3%) had treatment-related serious AEs. No treatment-related deaths occurred. Grade greater than or equal to three surgery-related AEs within 30 or 90 days after surgery were both reported in five patients (14.7%).
Conclusions: Adebrelimab plus nab-paclitaxel and carboplatin as perioperative therapy led to a substantial proportion of MPR and high resectability, with manageable toxicities. On the basis of the phase 1b results, phase 3 trial was initiated.
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