Abstract
Background
Intraperitoneal chemotherapy is promising for gastric cancer with peritoneal metastasis. Although a phase III study failed to show a statistically significant superiority of intraperitoneal paclitaxel combined with S-1 and intravenous paclitaxel, the sensitivity analysis suggested clinical efficacy. Thus, attempts to combine intraperitoneal paclitaxel with other systemic therapies with higher efficacy have been warranted. We sought to explore the efficacy of intraperitoneal paclitaxel with S-1 and cisplatin.
Patients and Methods
Gastric cancer patients with peritoneal metastasis were enrolled in the phase II trial. In addition to the established S-1 and cisplatin regimen every 5 weeks, intraperitoneal paclitaxel was administered on days 1, 8, and 22 at a dose of 20 mg/m2. The primary endpoint was overall survival rate at 1 year after treatment initiation. Secondary endpoints were progression-free survival and toxicity.
Results
Fifty-three patients were enrolled and fully evaluated for efficacy and toxicity. The 1-year overall survival rate was 73.6% (95% confidence interval 59.5–83.4%), and the primary endpoint was met. The median survival time was 19.4 months (95% confidence interval, 16.1–24.6 months). The 1-year progression-free survival rate was 49.6% (95% confidence interval, 34.6–62.9%). The incidences of grade 3/4 hematological and non-hematological toxicities were 43% and 47%, respectively. The frequent grade 3/4 toxicities included neutropenia (25%), anemia (30%), diarrhea (13%), and anorexia (17%). Intraperitoneal catheter and implanted port-related complications were observed in four patients. There was one treatment-related death.
Conclusions
Intraperitoneal paclitaxel combined with S-1 and cisplatin is well tolerated and active in gastric cancer patients with peritoneal metastasis.
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Acknowledgement
We sincerely thank all the participating patients and their families; investigators; support staff; members of the data and safety monitoring board. This study was supported in part by funding from Clinical Trials of Cancer Research Grant Program conducted by the Japan Society of Clinical Oncology and the Japan Agency for Medical Research and Development.
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This study was supported in part by funding from Clinical Trials of Cancer Research Grant Program conducted by Japan Society of Clinical Oncology and the Japan Agency for Medical Research and Development. D. Kobayashi received honoraria from Taiho Pharmaceutical Co., Ltd., and Bristol-Myers Squibb Co., Ltd. Y. Kodera received research funding from Taiho Pharmaceutical Co., Ltd., Nippon Kayaku Co., Ltd., and Pfizer Co., Ltd., and honoraria from Taiho Pharmaceutical Co., Ltd., Nippon Kayaku Co., Ltd., and Bristol-Myers Squibb Co., Ltd. S. Ueda received honoraria from Pfizer Co., Ltd. T. Arigami received honoraria from Bristol-Myers Squibb Co., Ltd. A. Hidemura received honoraria from Taiho Pharmaceutical Co., Ltd. T. Omori received research funding from Taiho Pharmaceutical Co., Ltd., and honoraria from Taiho Pharmaceutical Co., Ltd., and Bristol-Myers Squibb Co., Ltd. H. Yamaguchi received research funding from Taiho Pharmaceutical Co., Ltd., and Nippon Kayaku Co., Ltd., and honoraria from Taiho Pharmaceutical Co., Ltd., Nippon Kayaku Co., Ltd., and Bristol-Myers Squibb Co., Ltd. H. Y. Hirono received research funding from Taiho Pharmaceutical Co., Ltd., and honoraria from Taiho Pharmaceutical Co., Ltd. Y. Tsuji received honoraria from Taiho Pharmaceutical Co., Ltd. T. Tomita received honoraria from Taiho Pharmaceutical Co., Ltd., and Bristol-Myers Squibb Co., Ltd. K. Nakanishi received honoraria from Taiho Pharmaceutical Co., Ltd. A. Hirakawa received consulting fees from Taiho Pharmaceutical Co., Ltd. H. Ishigami received research funding from Taiho Pharmaceutical Co., Ltd., and drugs from Nippon Kayaku Co., Ltd.
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All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions. Informed consent to be included in the study, or the equivalent, was obtained from all patients.
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Kobayashi, D., Kodera, Y., Fukushima, R. et al. Phase II Study of Intraperitoneal Administration of Paclitaxel Combined with S-1 and Cisplatin for Gastric Cancer with Peritoneal Metastasis. Ann Surg Oncol 31, 735–743 (2024). https://doi.org/10.1245/s10434-023-14240-6
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DOI: https://doi.org/10.1245/s10434-023-14240-6