title: Reduction in membranous expression of beta-catenin and increased cytoplasmic E-cadherin expression predict poor survival in gastric cancer.
abstract: beta-catenin, a component of the E-cadherin-catenin cell adhesion complex, also plays a separate intracellular signalling role, interacting with APC protein. Intracellular accumulation of beta-catenin is common in colorectal neoplasia. beta-catenin abnormalities are associated with poor survival in gastric cancer, but previous studies do not differentiate between membrane-associated and intracellular beta-catenin. In this study we aimed to determine which type of expression abnormalities for E-cadherin, beta-catenin and alpha-catenin correlate with clinico-pathological features and survival in gastric cancer. Immunoperoxidase staining of paraffin-embedded sections from 40 gastric cancers was performed for E-cadherin, alpha- and beta-catenins using microwave unmasking and an avidin-biotin technique. Clinical data were obtained from case records and cancer registry records. Reduced membranous expression of beta-catenin occurred in 10/12 (83%) diffuse and 8/28 (29%) intestinal tumours (P= 0.0014), and was associated with poor differentiation (P= 0.0015) and short survival (P= 0.032), but not with age, sex, tumour size or nodal status. Nuclear expression of beta-catenin was uncommon; cytoplasmic expression was observed in 13/40 cases (33%) but did not correlate with histology, tumour grade or survival. Reduced E-cadherin membrane expression was associated with lymph node metastasis (P= 0.02). Neither E-cadherin or alpha-catenin expression correlated with survival. Reduced membranous expression of beta-catenin predicts poor prognosis in gastric cancer, whilst ectopic intracellular expression is relatively rare. The apparent differences in beta-catenin expression from those found in colon cancer merit further study.
authors.affiliation: Department of Surgery, University of Liverpool, UK.
authors.forename: S
authors.initials: S
authors.lastname: Ramesh
authors.forename: J
authors.initials: J
authors.lastname: Nash
authors.forename: P G
authors.initials: PG
authors.lastname: McCulloch
mesh_terms: D015820:Cadherins / Q000378:metabolism*; D002454:Cell Differentiation; D002462:Cell Membrane / Q000378:metabolism; D003593:Cytoplasm / Q000378:metabolism*; D003598:Cytoskeletal Proteins / Q000378:metabolism*; D005753:Gastric Mucosa / Q000378:metabolism; D006801:Humans; D008207:Lymphatic Metastasis; D011379:Prognosis; D013274:Stomach Neoplasms / Q000378:metabolism / Q000473:pathology*; D016019:Survival Analysis; D015534:Trans-Activators; D051176:beta Catenin
chemical_list: C495270:CTNNB1 protein, human; D015820:Cadherins; D003598:Cytoskeletal Proteins; D015534:Trans-Activators; D051176:beta Catenin