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Meta-analysis of three randomized trials of capecitabine plus cisplatin (XP) versus S-1 plus cisplatin (SP) as first-line treatment for advanced gastric cancer

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International Journal of Clinical Oncology Aims and scope Submit manuscript

Abstract

Background

S-1 plus cisplatin (SP) and capecitabine plus cisplatin (XP) are standard first-line regimens for advanced gastric cancer (AGC) worldwide. We conducted a meta-analysis using individual participant data (IPD) to investigate which is more suitable.

Methods

IPD from three randomized trials were collected. In these trials, patients with AGC were randomly allocated to SP (S-1 80–120 mg for 21 days plus cisplatin 60 mg/m2 (q5w)) or XP (capecitabine 2000 mg/m2 for 14 days plus cisplatin 80 mg/m2 (q3w)).

Results

In 211 eligible patients, median overall survival (OS) for SP versus XP was 13.5 and 11.7 months (hazard ratio [HR], 0.787; p = 0.114), progression-free survival (PFS) was 6.2 and 5.1 months (HR, 0.767; P = 0.076), and TTF was 5.1 and 4.0 months (HR, 0.611; P = 0.001). The most common grade ≥ 3 adverse events with SP or XP were neutropenia (18% vs. 29%) and anorexia (16% vs.18%). Subgroup analysis demonstrated significant interaction between treatment effect and performance status > 1 (HR, 0.685; P = 0.036), measurable lesion (HR, 0.709; P = 0.049), primary upper third tumor (HR, 0.539; P = 0.040), and differentiated type (HR, 0.549; interaction, 0.236; P = 0.019). For the differentiated type, OS was significantly longer in the SP group (13.2 months) than in the XP group (11.1 months) (HR, 0.549; P = 0.019). For the undifferentiated type, OS was similar in the SP group (14.2 months) and in the XP group (12.4 months) (HR, 0.868; P = 0.476).

Conclusions

SP and XP were both effective and well tolerated. SP might be suitable for the pathological differentiated subtype of AGC.

Clinical Trial Registration: The HERBIS-2, HERBIS-4A, and XParTS II trials were registered with UMIN-CTR as UMIN000006105, UMIN000006755, and UMIN000006045, respectively.

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Acknowledgements

We deeply appreciate all patients and investigators involved in the XParTS II trial and the OGSG HEBIS-2, -4A trials. We also thank the Osaka Gastrointestinal Cancer Chemotherapy Study Group (OGSG) and the Epidemiological & Clinical Research Information Network (ECRIN) for their support.

Funding

This study was funded by the Osaka Gastrointestinal Cancer Chemotherapy Study Group (OGSG). [No grant numbers apply].

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Correspondence to Kazuhiro Nishikawa.

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Conflict of interests

Kazuhiro Nishikawa has received honoraria for lectures from Bristol-Myers Squibb Co. Ltd., Daiichi-Sankyo Co. Ltd., EA Pharma Co. Ltd., Eli Lilly Japan K.K., MSD K.K., Ono Pharmaceutical Co. Ltd., Otsuka Pharmaceutical Co. Ltd., and Taiho Pharmaceutical Co. Ltd. Hisato Kawakami has received consulting fees from Bristol-Myers Squibb Co. Ltd., Eli Lilly Japan K.K., MSD K.K., Ono Pharmaceutical Co. Ltd., and Daiichi-Sankyo Co. Ltd.; honoraria from Bristol-Myers Squibb Co. Ltd., Eli Lilly Japan K.K., MSD K.K., Ono Pharmaceutical Co. Ltd., and Daiichi Sankyo Co. Ltd. Yukinori Kurokawa has received honoraria and research funding from Taiho Pharmaceutical. Taroh Satoh has received departmental research grants from Chugai Pharmaceutical Co. Ltd., Ono Pharmaceutical Co. Ltd., Bristol-Myers Squibb Co. Ltd., Daiichi-Sankyo Co. Ltd., Hutchmed, Parexell, and BeiGene, and honoraria from Eli Lilly Japan K.K., Ono Pharmaceutical Co. Ltd., Bristol-Myers Squibb Co. Ltd., and Daiichi-Sankyo Co. Ltd. All remaining authors declare no conflicts of interest.

Ethical approval

This trial was conducted in compliance with the ethical principles of the Declaration of Helsinki and the Ethical Guidelines for Clinical Studies of the Japanese Ministry of Health, Labour and Welfare. This trial was approved by the institutional review boards or ethics committees at all participating centers.

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10147_2023_2402_MOESM1_ESM.docx

Supplementary file 1 Fig. S1. Kaplan–Meier curves for PFS in differentiated type (a) and in undifferentiated type (b) by treatment arm. PFS, progression-free survival; SP, S-1 plus cisplatin; XP, capecitabine plus cisplatin.

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Nishikawa, K., Kawakami, H., Shimokawa, T. et al. Meta-analysis of three randomized trials of capecitabine plus cisplatin (XP) versus S-1 plus cisplatin (SP) as first-line treatment for advanced gastric cancer. Int J Clin Oncol 28, 1501–1510 (2023). https://doi.org/10.1007/s10147-023-02402-1

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