title: Expression of the cell-cell adhesion molecule beta-catenin in colorectal carcinomas and their metastases.
abstract: To study the dynamic events leading to impaired cell-cell adhesion upon transition to the invasive phenotype of colorectal cancer (CRC), we examined three distinct beta-catenin expression patterns (membranous, cytoplasmic, and nuclear) in the paired samples of the primary tumours (P) and their metastatic lesions (M). beta-catenin expression was detected by immunohistochemistry (IHC) in 33 pairs of the primary CRC and their metastases. In a pair-wise (P-M) comparison, the membranous index (MI) was significantly different between P and M (p=0.036, Wilcoxon Signed-Ranks test), while cytoplasmic index (CI) and nuclear index (NI) values did not significantly deviate between P and M. MI in primary tumours was inversely related to the patient's age (p=0.04) and tumour grade (p=0.03), while patients with low MI in M had a high rate of metastasis at diagnosis (p=0.06). CI in P was lower in patients with LN involvement (p=0.02) and in advanced tumour stage (p=0.002). Tumours of the ascending colon had the highest CI in their M (p=0.04). Interestingly, high MI of the M lesions was a significant predictor of favourable overall survival (OS) in univariate (Kaplan-Meier) survival analysis (p=0.035). In conclusion, significant aberrations in beta-catenin expression probably take place in CRC cells during the development of metastatic phenotype, but a change from membrane expression to cytoplamic and/or nuclear expression is not a prerequisite for metastasis in all cases.
authors.affiliation: Department of Oncology and Radiotherapy, Turku University Hospital, Turku, Finland. abuhme@utu.fi
authors.forename: A
authors.initials: A
authors.lastname: Buhmeida
authors.forename: A
authors.initials: A
authors.lastname: Elzagheid
authors.forename: A
authors.initials: A
authors.lastname: Algars
authors.forename: Y
authors.initials: Y
authors.lastname: Collan
authors.forename: K
authors.initials: K
authors.lastname: Syrjänen
authors.forename: S
authors.initials: S
authors.lastname: Pyrhönen
mesh_terms: D002448:Cell Adhesion; D002462:Cell Membrane / Q000378:metabolism; D002467:Cell Nucleus / Q000378:metabolism; D015179:Colorectal Neoplasms / Q000378:metabolism* / Q000473:pathology*; D003593:Cytoplasm / Q000378:metabolism; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D009361:Neoplasm Invasiveness; D009362:Neoplasm Metastasis; D009364:Neoplasm Recurrence, Local / Q000378:metabolism; D011379:Prognosis; D016019:Survival Analysis; D051176:beta Catenin / Q000096:biosynthesis*
chemical_list: D051176:beta Catenin