Toripalimab Plus FLOT in Locally Advanced Gastric Cancer

Summary

Neoadjuvant chemoimmunotherapy for locally advanced gastric and gastroesophageal junction (G/GEJ) cancer is currently under investigation. Most clinical studies have simply combined chemotherapy with anti-PD-1 therapy without considering the impact of chemotherapy drugs on activated immune cells. We designed this study to explore two different treatment regimens for neoadjuvant chemotherapy in patients with locally advanced G/GEJ cancer. One group received FLOT plus toripalimab on Day 1 of each cycle, every 2 weeks for 4 cycles, followed by surgery; the other group received FLOT plus toripalimab on Day 3 of each cycle, every 3 weeks for 3 cycles, followed by surgery. A total of 69 subjects were enrolled. Preliminary statistical analysis conducted one year after the last subject was enrolled revealed no statistically significant differences in pCR and MPR between the two regimens. The median DFS for both groups has not been reached, and there is no statistically significant difference in DFS between the two groups at present. Further subgroup analysis indicated that among subjects with PD-L1 CPS ≥1, the triweekly group achieved a rate of 42.1%, compared to 29.4% in the biweekly group, with no statistically significant difference between the two groups. However, the incidence of bone marrow suppression was lower in the triweekly group than in the biweekly group. Based on the preliminary findings, we plan to conduct an expanded study and transition to a multicenter clinical trial. This study aims to further validate the efficacy of the triweekly chemoimmunotherapy in patients with PD-L1 CPS ≥1 locally advanced G/GEJ cancer.

Timeline

Start

2021-06-25

Primary completion

2025-12-31

Completion

2028-12-31

Publications

• Background Voorwerk L, Slagter M, Horlings HM, Sikorska K, van de Vijver KK, de Maaker M, Nederlof I, Kluin RJC, Warren S, Ong S, Wiersma TG, Russell NS, Lalezari F, Schouten PC, Bakker NAM, Ketelaars SLC, Peters D, Lange CAH, van Werkhoven E, van Tinteren H, Mandjes IAM, Kemper I, Onderwater S, Chalabi M, Wilgenhof S, Haanen JBAG, Salgado R, de Visser KE, Sonke GS, Wessels LFA, Linn SC, Schumacher TN, Blank CU, Kok M. Immune induction strategies in metastatic triple-negative breast cancer to enhance the sensitivity to PD-1 blockade: the TONIC trial. Nat Med. 2019 Jun;25(6):920-928. doi: 10.1038/s41591-019-0432-4. Epub 2019 May 13.
• Background Loibl S, Untch M, Burchardi N, Huober J, Sinn BV, Blohmer JU, Grischke EM, Furlanetto J, Tesch H, Hanusch C, Engels K, Rezai M, Jackisch C, Schmitt WD, von Minckwitz G, Thomalla J, Kummel S, Rautenberg B, Fasching PA, Weber K, Rhiem K, Denkert C, Schneeweiss A. A randomised phase II study investigating durvalumab in addition to an anthracycline taxane-based neoadjuvant therapy in early triple-negative breast cancer: clinical results and biomarker analysis of GeparNuevo study. Ann Oncol. 2019 Aug 1;30(8):1279-1288. doi: 10.1093/annonc/mdz158.
• Background He X, Du Y, Wang Z, Wang X, Duan J, Wan R, Xu J, Zhang P, Wang D, Tian Y, Han J, Fei K, Bai H, Tian J, Wang J. Upfront dose-reduced chemotherapy synergizes with immunotherapy to optimize chemoimmunotherapy in squamous cell lung carcinoma. J Immunother Cancer. 2020 Oct;8(2):e000807. doi: 10.1136/jitc-2020-000807.
• Background Shitara K, Rha SY, Wyrwicz LS, Oshima T, Karaseva N, Osipov M, Yasui H, Yabusaki H, Afanasyev S, Park YK, Al-Batran SE, Yoshikawa T, Yanez P, Dib Bartolomeo M, Lonardi S, Tabernero J, Van Cutsem E, Janjigian YY, Oh DY, Xu J, Fang X, Shih CS, Bhagia P, Bang YJ; KEYNOTE-585 investigators. Neoadjuvant and adjuvant pembrolizumab plus chemotherapy in locally advanced gastric or gastro-oesophageal cancer (KEYNOTE-585): an interim analysis of the multicentre, double-blind, randomised phase 3 study. Lancet Oncol. 2024 Feb;25(2):212-224. doi: 10.1016/S1470-2045(23)00541-7. Epub 2023 Dec 19.

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