Abstract
Background
Diffuse type adenocarcinoma and, more specifically, signet ring cell carcinoma (SRCC) of the stomach and gastroesophageal junction (GEJ) have a poor prognosis and the value of neoadjuvant chemo(radio)therapy (nCRT) is unclear.
Methods
All patients who underwent surgery for diffuse type gastric and GEJ carcinoma between 2004 and 2015 were retrospectively included from the Netherlands Cancer Registry. The primary outcome was overall survival after surgery. Kaplan–Meier curves were plotted. Furthermore, multivariable Poisson and Cox regressions were performed, correcting for confounders. To comply with the Cox regression proportional hazard assumption, gastric cancer survival was split into two groups, i.e. <90 days and >90 days, postoperatively by adding an interaction variable.
Results
Analyses included 2046 patients with diffuse type cancer: 1728 gastric cancers (50% SRCC) and 318 GEJ cancers (39% SRCC). In the gastric cancer group, 49% received neoadjuvant chemotherapy (nCT) and 51% received primary surgery (PS). All-cause mortality within 90 days postoperatively was lower after nCT (hazard ratio [HR] 0.29, 95% confidence interval [CI] 0.20–0.44; p < 0.001). Also after 90 days, mortality was lower in the nCT group (HR for the interaction variable 2.84, 95% CI 1.87–4.30, p < 0.001; total HR 0.29*2.84 = 0.84). In the GEJ group, 38% received nCT, 22% received nCRT, and 39% received PS. All-cause mortality was lower after nCT (HR 0.63, 95% CI 0.43–0.93; p = 0.020) compared with PS. The nCRT group was removed from the Cox regression analysis since the Kaplan–Meier curves of nCRT and PS intersected. The results for gastric and GEJ carcinomas were similar between the SRCC and non-SRCC subgroups.
Conclusion
For gastric and GEJ diffuse type cancer, including SRCC, nCT was associated with increased survival.
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Acknowledgment
The authors would like to thank all participating hospitals in The Netherlands for collecting the data, and the NCR and PALGA for supplying the data for this study.
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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. This study was performed with nationwide, anonymous data; thus, informed consent or its substitute was waived by the Ethical Review Board of the NCR.
Disclosures
Relevant financial activities outside the submitted work. Peter D. Siersema is receiving research support from Pentax (Japan), The eNose Company, MicroTech (China) and Motus GI (USA). Rob H.A. Verhoeven has received research grants from Bristol-Myer Squibb and Roche. Emma C. Gertsen, Arjen van der Veen, Hylke J.F. Brenkman, Lodewijk A.A. Brosens, Rachel S. van der Post, Josianne C.H.B.M. Luijten, Pauline A.J. Vissers, Erik Vegt, Richard van Hillegersberg, and Jelle P. Ruurda have no disclosures to declare.
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Gertsen, E.C., van der Veen, A., Brenkman, H.J.F. et al. Multimodal Therapy Versus Primary Surgery for Gastric and Gastroesophageal Junction Diffuse Type Carcinoma, with a Focus on Signet Ring Cell Carcinoma: A Nationwide Study. Ann Surg Oncol 31, 1760–1772 (2024). https://doi.org/10.1245/s10434-023-14690-y
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DOI: https://doi.org/10.1245/s10434-023-14690-y