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Annals of Surgical Oncology
Published in: Annals of Surgical Oncology 4/2010

01-04-2010 | Colorectal Cancer

Is Total Mesorectal Excision Always Necessary for T1–T2 Lower Rectal Cancer?

Authors: Hirotoshi Kobayashi, MD, Hidetaka Mochizuki, MD, Tomoyuki Kato, MD, Takeo Mori, MD, Shingo Kameoka, MD, Kazuo Shirouzu, MD, Yukio Saito, MD, Masahiko Watanabe, MD, Takayuki Morita, MD, Jin-ichi Hida, MD, Masashi Ueno, MD, Masato Ono, MD, Masamichi Yasuno, MD, Kenichi Sugihara, MD

Published in: Annals of Surgical Oncology | Issue 4/2010

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Abstract

Background

The goal of this multicenter study was to clarify the determinants of local excision for patients with T1–T2 lower rectal cancer.

Methods

Data from 567 consecutive patients who underwent radical resection for T1–T2 lower rectal cancer at 12 institutions between 1991 and 1998 were reviewed. Rates of lymph node metastasis were investigated using a tree analysis, which was hierarchized using independent risk factors for nodal involvement.

Results

The independent risk factors for lymph node metastasis were female gender, depth of tumor invasion, histology other than well-differentiated adenocarcinoma, and lymphatic invasion. According to the first three parameters that can be obtained preoperatively, only 0.99% of the patients without risk factors had lymph node metastasis. On the other hand, even if the lower rectal cancer was at stage T1, women with histological types other than well-differentiated adenocarcinoma had an approximately 30% probability of having lymph node metastasis. Lymphatic invasion was most useful to predict nodal involvement among patients with T2 lower rectal cancer. The rates of lymph node metastasis in T2 patients with and without lymphatic invasion were 32.9% and 9.1%, respectively.

Conclusions

Gender is one of the most important predictors for lymph node metastasis in patients with early distal rectal cancer. Three parameters, including depth of tumor invasion, histology, and gender, are useful determinants for local excision. Additional studies are required to establish the minimum optimal treatment for T2 lower rectal cancer.
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Metadata
Title
Is Total Mesorectal Excision Always Necessary for T1–T2 Lower Rectal Cancer?
Authors
Hirotoshi Kobayashi, MD
Hidetaka Mochizuki, MD
Tomoyuki Kato, MD
Takeo Mori, MD
Shingo Kameoka, MD
Kazuo Shirouzu, MD
Yukio Saito, MD
Masahiko Watanabe, MD
Takayuki Morita, MD
Jin-ichi Hida, MD
Masashi Ueno, MD
Masato Ono, MD
Masamichi Yasuno, MD
Kenichi Sugihara, MD
Publication date
01-04-2010
Publisher
Springer-Verlag
Published in
Annals of Surgical Oncology / Issue 4/2010
Print ISSN: 1068-9265
Electronic ISSN: 1534-4681
DOI
https://doi.org/10.1245/s10434-009-0849-y

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