Is total mesorectal excision always necessary for T1-T2 lower rectal cancer?

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.

journal_name

Ann Surg Oncol

authors

Kobayashi H,Mochizuki H,Kato T,Mori T,Kameoka S,Shirouzu K,Saito Y,Watanabe M,Morita T,Hida J,Ueno M,Ono M,Yasuno M,Sugihara K

doi

10.1245/s10434-009-0849-y

subject

Has Abstract

pub_date

2010-04-01 00:00:00

pages

973-80

issue

4

eissn

1068-9265

issn

1534-4681

journal_volume

17

pub_type

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