title: Comparative clinicopathological characteristics of colon and rectal T1 carcinoma.
abstract: Lymph node metastasis significantly influences the management of patients with colorectal carcinoma. It has been observed that the biology of colorectal carcinoma differs by location. The aim of the current study was to retrospectively compare the clinicopathological characteristics of patients with colon and rectal T1 carcinomas, particularly their rates of lymph node metastasis. Of the 19,864 patients who underwent endoscopic or surgical resection of colorectal neoplasms at Showa University Northern Yokohama Hospital, 557 had T1 surgically resected carcinomas, including 457 patients with colon T1 carcinomas and 100 patients with rectal T1 carcinomas. Analysed clinicopathological features included patient age, gender, tumor size, morphology, tumor budding, invasion depth, vascular invasion, histological grade, lymphatic invasion and lymph node metastasis. Rectal T1 carcinomas were significantly larger than colon T1 carcinomas (mean ± standard deviation: 23.7±13.1 mm vs. 19.9±11.0 mm, P<0.01) and were accompanied by significantly higher rates of vascular invasion (48.0% vs. 30.2%, P<0.01). Significant differences were not observed among any other clinicopathological factors. In conclusion, tumor location itself was not a risk factor for lymph node metastasis in colorectal T1 carcinomas, even though on average, rectal T1 carcinomas were larger and accompanied by a significantly higher rate of vascular invasion than colon T1 carcinomas.
authors.affiliation: Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama 224-8503, Japan.
authors.forename: Katsuro
authors.initials: K
authors.lastname: Ichimasa
authors.affiliation: Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama 224-8503, Japan.
authors.forename: Shin-Ei
authors.initials: SE
authors.lastname: Kudo
authors.affiliation: Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama 224-8503, Japan.
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Miyachi
authors.affiliation: Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama 224-8503, Japan.
authors.forename: Yuta
authors.initials: Y
authors.lastname: Kouyama
authors.affiliation: Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama 224-8503, Japan.
authors.forename: Takemasa
authors.initials: T
authors.lastname: Hayashi
authors.affiliation: Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama 224-8503, Japan.
authors.forename: Kunihiko
authors.initials: K
authors.lastname: Wakamura
authors.affiliation: Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama 224-8503, Japan.
authors.forename: Tomokazu
authors.initials: T
authors.lastname: Hisayuki
authors.affiliation: Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama 224-8503, Japan.
authors.forename: Toyoki
authors.initials: T
authors.lastname: Kudo
authors.affiliation: Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama 224-8503, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Misawa
authors.affiliation: Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama 224-8503, Japan.
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Mori
authors.affiliation: Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama 224-8503, Japan.
authors.forename: Shingo
authors.initials: S
authors.lastname: Matsudaira
authors.affiliation: Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama 224-8503, Japan.
authors.forename: Eiji
authors.initials: E
authors.lastname: Hidaka
authors.affiliation: Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama 224-8503, Japan.
authors.forename: Shigeharu
authors.initials: S
authors.lastname: Hamatani
authors.affiliation: Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama 224-8503, Japan.
authors.forename: Fumio
authors.initials: F
authors.lastname: Ishida
keywords: clinicopathological features; colorectal T1 carcinoma; colorectal surgery; endoscopic resection; lymph node metastasis