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24.09.2019 | Original Scientific Report

Tumor size  ≥50 mm as an Independent Prognostic Factor for Patients with Stage II or III Gastric Cancer After Postoperative S-1 Monotherapy: Analysis of a Multi-institution Dataset

Zeitschrift:
World Journal of Surgery
Autoren:
MD Masayuki Tsutsuyama, MD, FACS Mitsuro Kanda, MD Seiji Ito, MD Yoshinari Mochizuki, MD Hitoshi Teramoto, MD Kiyoshi Ishigure, MD Toshifumi Murai, MD Takahiro Asada, MD Akiharu Ishiyama, MD Hidenobu Matsushita, MD Chie Tanaka, MD Daisuke Kobayashi, MD Michitaka Fujiwara, PhD Kenta Murotani, MD, FACS Yasuhiro Kodera
Wichtige Hinweise

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1007/​s00268-019-05198-2) contains supplementary material, which is available to authorized users.

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Abstract

Background

Little is known about the changes in prognostic factors after adjuvant S-1 monotherapy has become widespread as a standard of care for patients with gastric cancer (GC) in East Asia. The present study compared prognostic factors of patients with stage II/III GC treated with or without S-1 adjuvant to formulate appropriate risk stratification strategies.

Methods

We designed a large multicenter dataset and retrospectively analyzed 847 patients with GC stage II or III, who underwent curative gastrectomy between 2010 and 2014. Clinicopathological features and prognostic factors were compared between the two patient groups: surgery-alone (n = 266) and S-1 adjuvant (n = 581).

Results

There were no significant differences in pathological tumor depths, nodal status, and disease stages between groups. Recurrence-free survival was significantly longer in the S-1 adjuvant group. For the surgery-alone group, independent prognostic factors were (in order of hazard ratio): (1) invasive growth, (2) high preoperative carcinoembryonic antigen levels, (3) total gastrectomy. For the S-1 adjuvant group, macroscopic tumor size (≥50 mm) was identified as another independent prognostic factor next only to pN2/3. There was overlap between the survival curves of patients with tumor size  ≥50 mm in both groups. After receiving adjuvant S-1 monotherapy,  ≥50 mm patients had significantly higher prevalence of peritoneal and lymph node metastasis as initial recurrences compared with  <50 mm patients.

Conclusions

Adjuvant S-1 monotherapy may alter listing of adverse prognostic factors of stage II and III patients. Macroscopic tumor size  ≥50 mm may serve as an important determinant for risk stratification to identify patients who require more intensive treatment.

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Zusatzmaterial
Supplemental Fig 1. ROC curve analysis of macroscopic tumor size to predict cancer-related mortality.
268_2019_5198_MOESM1_ESM.tif
Supplemental Fig 2. Comparison of overall survival curves according to postoperative treatment, disease stage and macroscopic tumor size.
268_2019_5198_MOESM2_ESM.tif
Literatur
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