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Open Access 01-12-2017 | Research article

Clinicopathological features and prognostic validity of WHO grading classification of SI-NENs

Authors: Luohai Chen, Lin Zhou, Meng Zhang, Liang Shang, Panpan Zhang, Wei Wang, Cheng Fang, Jingnan Li, Tianming Xu, Huangying Tan, Pan Zhang, Meng Qiu, Xianjun Yu, Kaizhou Jin, Ye Chen, Huishan Chen, Rong Lin, Qin Zhang, Lin Shen, Minhu Chen, Jie Li, Leping Li, Jie Chen

Published in: BMC Cancer | Issue 1/2017

Abstract

Background

The clinicopathological characteristics of small intestinal neuroendocrine neoplasms (SI-NENs) and the prognostic validity of WHO grading classification for SI-NENs are still unknown in Asian patients.

Methods

277 patients and 8315 patients with SI-NENs were retrieved respectively from eleven Chinese hospitals and Surveillance, Epidemiology, and End Results (SEER) cancer registry. Overall survival was used as the major study outcome. Survival analysis using Kaplan-Meier analysis with log-rank test and cox regression analysis were applied.

Results

Clinicopathological characteristics of SI-NENs were quite different among different races. Duodenum was the predominant tumor site in Chinese patients and Asian/Pacific Islander patients but not in white patients from SEER database. Patients with duodenal NENs tended to have more localized disease than patients with jejunal/ileal NENs which were confirmed by patients from SEER database. Grade 3 or poorly differentiated/undifferentiated tumor were more common and tumor size was significantly larger in ampullary NENs compared with that in non-ampullary duodenal NENs. As for the prognostic validity of WHO grading classification, survival between patients with grade 1 and grade 2 disease was not significantly different. Ki-67 index of 5% might be a better threshold between grade 1 and grade 2 than Ki-67 index of 2% in SI-NENs.

Conclusions

Our study revealed that the clinicopathological characteristics of SI-NENs among different races were quite different. This might because duodenal NENs was much more common in Chinese patients and Asian/Pacific Islander patients. Duodenal NENs and jejunal/ileal NENs, ampullary and non-ampullary duodenal NENs shared different characteristics. Ki-67 index of 5% might be a better threshold between grade 1 and grade 2 in SI-NENs.

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Title: Clinicopathological features and prognostic validity of WHO grading classification of SI-NENs
Authors: Luohai Chen
Lin Zhou
Meng Zhang
Liang Shang
Panpan Zhang
Wei Wang
Cheng Fang
Jingnan Li
Tianming Xu
Huangying Tan
Pan Zhang
Meng Qiu
Xianjun Yu
Kaizhou Jin
Ye Chen
Huishan Chen
Rong Lin
Qin Zhang
Lin Shen
Minhu Chen
Jie Li
Leping Li
Jie Chen
Publication date: 01-12-2017
Publisher: BioMed Central
Published in: BMC Cancer / Issue 1/2017
Electronic ISSN: 1471-2407
DOI: https://doi.org/10.1186/s12885-017-3490-3

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