Open AccessPathological tumor infiltrative pattern and sites of initial recurrence in stage II/III gastric cancer: Propensity score matching analysis of a multi‐institutional dataset
Author(s) -
Nakagawa Nobuhiko,
Kanda Mitsuro,
Ito Seiji,
Mochizuki Yoshinari,
Teramoto Hitoshi,
Ishigure Kiyoshi,
Murai Toshifumi,
Asada Takahiro,
Ishiyama Akiharu,
Matsushita Hidenobu,
Tanaka Chie,
Kobayashi Daisuke,
Fujiwara Michitaka,
Murotani Kenta,
Kodera Yasuhiro
Publication year - 2018
Publication title -
cancer medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.403
H-Index - 53
ISSN - 2045-7634
DOI - 10.1002/cam4.1868
Subject(s) - propensity score matching , medicine , hazard ratio , stage (stratigraphy) , gastrectomy , cancer , pathological , gastroenterology , proportional hazards model , lymph node , surgery , confidence interval , paleontology , biology
Background Advanced gastric cancer frequently recurs even after radical resection followed by adjuvant chemotherapy. The aim of this study was to evaluate the relationship between pathological infiltrative pattern (INF) and initial recurrence patterns in patients with stage II/III gastric cancer using a large multicenter database. Methods We retrospectively analyzed 1098 eligible patients who underwent curative gastrectomy for stage II/III gastric cancer at nine institutions between 2010 and 2014. Patients were categorized into the INF‐a/b and INF‐c groups and adjusted using propensity score matching. Results After propensity score matching, 686 patients (343 for each) were classified in the INF‐a/b and INF‐c groups. There were no significant differences in overall and disease‐free survival between the two groups. In the INF‐a/b group, frequencies of recurrence at the peritoneum, lymph node, and liver were equivalent. In contrast, the peritoneum was the most frequent site and accounted for 60% of the total recurrences in the INF‐c group. The cumulative peritoneal recurrence rate was significantly higher in the INF‐c group than in the INF‐a/b group (hazard ratio 2.47). INF‐c was a significant risk factor for peritoneal recurrences in most subgroups including age, sex, macroscopic type, tumor differentiation, and disease stage, and whether the postoperative treatment was given. Multivariate analysis identified INF‐c as an independent risk factor for peritoneal recurrences. The cumulative liver recurrence rate was significantly higher in the INF‐a/b group than in the INF‐c group (hazard ratio 3.44). Conclusions INF may represent an important predictor of recurrence patterns after curative resection of stage II/III gastric cancer.