Comparing a PD-L1 inhibitor plus chemotherapy to chemotherapy alone in neoadjuvant therapy for locally advanced ESCC: a randomized Phase II clinical trial

Author:

Li Yong,Zhou Aiping,Liu Shuoyan,He Ming,Chen Keneng,Tian Ziqiang,Li Yin,Qin Jianjun,Wang Zhen,Chen Haiquan,Tian Hui,Yu Yue,Qu Wang,Xue Liyan,He Shun,Wang Shuhang,Bie Fenglong,Bai Guangyu,Zhou Bolun,Yang Zhaoyang,Huang Huiyao,Fang Yan,Li Benjamin,Dai Xiangrong,Gao ShugengORCID,He Jie

Abstract

Abstract Background A Phase II study was undertaken to evaluate the safety and efficacy of the neoadjuvant socazolimab, a novel PD-L1 inhibitor, in combination with nab-paclitaxel and cisplatin for locally advanced esophageal squamous cell carcinoma (ESCC). Methods Sixty-four patients were randomly divided between the Socazolimab + nab-paclitaxel + cisplatin (TP) arm (n = 32) and the control arm (n = 32), receiving either socazolimab (5 mg/kg intravenously (IV), day 1) or a placebo with nab-paclitaxel (125 mg/m2 IV, day 1/8) and cisplatin (75 mg/m2 IV, day 1) repeated every 21 days for four cycles before surgery. The primary endpoint was major pathological response (MPR), and the secondary endpoints were pathological complete response (pCR), R0 resection rate, event-free survival (EFS), overall survival (OS), and safety. Results A total of 29 (90.6%) patients in each arm underwent surgery, and 29 (100%) and 28 (98.6%) patients underwent R0 resection in the Socazolimab + TP and Placebo + TP arms, respectively. The MPR rates were 69.0 and 62.1% (95% Confidence Interval (CI): 49.1–84.0% vs. 42.4–78.7%, P = 0.509), and the pCR rates were 41.4 and 27.6% (95% CI: 24.1–60.9% vs. 13.5–47.5%, P = 0.311) in the Socazolimab + TP and Placebo + TP arms, respectively. Significantly higher incidence rates of ypT0 (37.9% vs. 3.5%; P = 0.001) and T downstaging were observed in the Socazolimab + TP arm than in the Placebo + TP arm. The EFS and OS outcomes were not mature. Conclusions The neoadjuvant socazolimab combined with chemotherapy demonstrated promising MPR and pCR rates and significant T downstaging in locally advanced ESCC without increasing surgical complication rates. Trial registration Registration name (on clinicaltrials.gov): A Study of Anti-PD-L1 Antibody in Neoadjuvant Chemotherapy of Esophageal Squamous Cell Carcinoma. Registration number: NCT04460066.

Funder

National Key R&D Program of China

National Natural Science Foundation of China

Medical and Health Science-Technology Innovation Project of the Chinese Academy of Medical Sciences

Central Health Research Key Projects

Research Project of the Institute

Beijing Natural Science Foundation

Publisher

Springer Science and Business Media LLC

Subject

General Medicine

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