A comparative study of the clinicopathological significance of E-cadherin and catenins (alpha,beta,gamma) expression in the surgical management of oral tongue carcinoma

Purpose: E-cadherin and cadherins are important epithelial adhesion molecul es in normal epithelium. Loss of E-cadherin-catenin adhesion is an importan t step in the progression of many epithelial cancers. E-cadherin and cateni ns expression in carcinoma of the tongue were evaluated in relation to thei r clinicopathological features and prognostic values, Method: Immunohistoch emical staining was carried out with E-cadherin and (alpha, beta, gamma)-ca tenin monoclonal antibodies for 85 surgical specimens of oral tongue carcin oma, nine matched metastatic lymph nodes, and seven locally recurrent rumou rs. Results: There was under-expression in 85% of E-cadherin, 94% of alpha -catenin, 89% of beta -catenin, and 83% of gamma -catenin in the primary tu mours. There was no correlation of E-cadherin/catenin expression with sex, age, cancer stage, and differentiation. Nodal metastasis was found in 68% o f patients with weak expression of gamma -catenin compared with 9% with str ong expression in primary tumours (chi-square, P = 0.02). E-cadherin was a significant prognostic factor for survival and recurrence; patients with we ak E-cadherin expression had 53% 5-year survival compared with 85% with str ong expression (Wilcoxon, P = 0.0159). Conclusions: Both E-cadherin and cat enins were highly under-expressed in oral tongue carcinoma, metastatic lymp h node, and recurrent tumour. gamma -catenin had predictive value for nodal metastasis. E-cadherin was, however, a more important prognostic factor fo r recurrence and survival.