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Diagnostic Pathology
Published in: Diagnostic Pathology 1/2016

Open Access 01-12-2016 | Research

The clinicopathological significance of angiogenesis in hindgut neuroendocrine tumors obtained via an endoscopic procedure

Authors: Yoichiro Okubo, Osamu Motohashi, Norisuke Nakayama, Ken Nishimura, Rika Kasajima, Yohei Miyagi, Manabu Shiozawa, Emi Yoshioka, Masaki Suzuki, Kota Washimi, Kae Kawachi, Madoka Nito, Yoichi Kameda, Tomoyuki Yokose

Published in: Diagnostic Pathology | Issue 1/2016

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Abstract

Background

As the World Health Organization grading system for gastroenteropancreatic-neuroendocrine tumors (GEP-NETs) may not always correlate with tumor progression, it is imperative that other independent predictors of tumor progression be established. To identify such predictors, we conducted a retrospective histopathological study of hindgut NETs, obtained from endoscopic procedures, and used statistical analyses to evaluate predictive factors.

Methods

We first obtained clinicopathological data of cases of hindgut NETs. Tissue sections from tumor samples were prepared and subjected to pathological examination. In particular, we calculated the microvessel density (MVD) and lymphatic microvessel density (LMVD) values, and performed appropriate statistical analyses.

Results

A total of 42 cases of hindgut NETs were selected for the study, 41 from the rectum and 1 from the sigmoid colon. Based on the Ki-67 labeling index, 34 cases were classified as NET G1 tumors and 8 as NET G2 tumors. MVD values ranged from 1.4/mm2 to 73.9/mm2 and LMVD values from 0/mm2 to 22.9/mm2. MVD and LMVD were identified as risk factors for venous and lymphatic invasion of hindgut NETs. Moreover, MVD positively correlated with the maximum diameter of the tumor.

Conclusions

Tumor progression of NETs may cause angiogenesis and lymphangiogenesis, via an unknown mechanism, as well as lymphovascular invasion. Angiogenesis likely plays an important role in occurrence and progression in the initial phase of hindgut NETs.
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Metadata
Title
The clinicopathological significance of angiogenesis in hindgut neuroendocrine tumors obtained via an endoscopic procedure
Authors
Yoichiro Okubo
Osamu Motohashi
Norisuke Nakayama
Ken Nishimura
Rika Kasajima
Yohei Miyagi
Manabu Shiozawa
Emi Yoshioka
Masaki Suzuki
Kota Washimi
Kae Kawachi
Madoka Nito
Yoichi Kameda
Tomoyuki Yokose
Publication date
01-12-2016
Publisher
BioMed Central
Published in
Diagnostic Pathology / Issue 1/2016
Electronic ISSN: 1746-1596
DOI
https://doi.org/10.1186/s13000-016-0580-5

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