title: Clinical significance of angiogenesis in rectal carcinoid tumors.
abstract: This study was designed to examine angiogenesis in rectal carcinoid tumors in relation to the clinicopathologic features. Seventy-seven rectal carcinoid tumors were studied clinicopathologically and experimentally. Cellular proliferation and microvessel density (MVD) were examined immunohistochemically. We used the antibodies MIB-1 for Ki-67, DO7 for p53, and NU-4A1 for CD34 expression in this study. Ki-67 labeling index (LI) of all lesions was below 3%, and the median Ki-67 LI of all lesions was 0.68+/-0.70% (mean +/- SD). A correlation was recognized between tumor size, metastasis and Ki-67 LI (p<0.05). Median MVD of all lesions was 25.9+/-13.1 (mean +/- SD). MVD was correlated with the tumor size (p<0.01), presence of depression (p<0.01), lymphatic (p<0.01) or venous (p<0.05) invasion, and existence of metastasis (p<0.01). But there was no significant relationship between MVD and Ki-67 LI. p53 protein was detected sporadically in only 1 case (1.3%) demonstrating both liver and lymph node metastases. Rectal carcinoid tumors are slow-growing tumors with a lower proliferative activity. Angiogenesis plays an important role in progression of rectal carcinoid tumors independent of the cellular proliferative activity.
authors.affiliation: Department of Endoscopy, Hiroshima University School of Medicine, Hiroshima 734-8551, Japan.
authors.forename: Seiji
authors.initials: S
authors.lastname: Onogawa
authors.forename: Shinji
authors.initials: S
authors.lastname: Tanaka
authors.forename: Shiro
authors.initials: S
authors.lastname: Oka
authors.forename: Masao
authors.initials: M
authors.lastname: Morihara
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Kitadai
authors.forename: Masaharu
authors.initials: M
authors.lastname: Sumii
authors.forename: Masaharu
authors.initials: M
authors.lastname: Yoshihara
authors.forename: Fumio
authors.initials: F
authors.lastname: Shimamoto
authors.forename: Ken
authors.initials: K
authors.lastname: Haruma
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Chayama
mesh_terms: D018952:Antigens, CD34 / Q000096:biosynthesis; D002276:Carcinoid Tumor / Q000098:blood supply*; D002455:Cell Division; D018450:Disease Progression; D006801:Humans; D007150:Immunohistochemistry; D019394:Ki-67 Antigen / Q000096:biosynthesis; D008207:Lymphatic Metastasis; D009362:Neoplasm Metastasis; D009389:Neovascularization, Pathologic; D011379:Prognosis; D012004:Rectal Neoplasms / Q000098:blood supply*; D012008:Recurrence; D016159:Tumor Suppressor Protein p53 / Q000096:biosynthesis
chemical_list: D018952:Antigens, CD34; D019394:Ki-67 Antigen; D016159:Tumor Suppressor Protein p53