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Saudi J Gastroenterol. 2020 Feb 7. doi: 10.4103/sjg.SJG_406_19. [Epub ahead of print]

Operable gastric adenocarcinoma with different histological subtypes: Cancer-specific survival in the United States.

Author information

1
The First Affiliated Hospital of Fujian Medical University, Department of Gastrointestinal Surgery 2 Section, 20th,Chazhong Road, Fuzhou, Fujian, China.

Abstract

Background/Aims:

Gastric signet ring cell carcinoma (GSRC), a subtype of adenocarcinoma, has been considered a histological type with poor survival. We aimed to compare the survival outcomes between patients with GSRC and patients with gastric non-signet ring cell adenocarcinoma (NGSRC) and constructed a nomogram to predict gastric adenocarcinoma-specific survival (GCSS).

Patients and Methods:

We identified 10,031 patients with gastric adenocarcinoma (GA) from the surveillance, epidemiology, and end results (SEER) database and stratified them into two histological type groups: GSRC and NGSRC. We used propensity score matching and identified 4304 patients (training cohort) to assess the effect of the histological type on GCSS with Kaplan-Meier curves, and constructed a predictive nomogram. The accuracy of the nomogram was tested on the remaining 5727 patients (validation cohort) with concordance index (C-index) values, calibration curves, and receiver operating characteristic (ROC) curve analysis.

Results:

We found that the histological type SRC was not associated with significantly poor survival (5-year survival rate: 46.1% vs 46.7%, P = 0.822). GSRC patients had similar GCSS rates compared to those with NGSRC in each tumor, node, and metastasis (TNM) stage (allP > 0.05). The nomogram showed that histological type was a relatively weak predictor of survival. The C-index value of the nomogram for predicting survival was 0.720, similar to that in the validation cohort (0.724).

Conclusions:

Patients with GSRC had a similar prognosis to those with NGSRC. The proposed nomogram allowed a relatively accurate survival prediction for operable GA patients after gastrectomy.

KEYWORDS:

Gastric adenocarcinoma; nomogram; signet ring cell carcinoma; survival

PMID:
32031158
DOI:
10.4103/sjg.SJG_406_19

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