Galectin-3 expression is prognostic in diffuse type gastric adenocarcinoma, confers aggressive phenotype, and can be targeted by YAP1/BET inhibitors.
Br J Cancer
; 118(1): 52-61, 2018 01.
Article
em En
| MEDLINE
| ID: mdl-29136404
ABSTRACT
BACKGROUND:
Overexpression of Galectin-3 (Gal-3), a ß-galactoside binding protein, has been noted in many tumour types but its functional significance and clinical utility in gastric adenocarcinoma (GAC) are not well known.METHODS:
We studied 184 GAC patients characterised by histologic grade, sub-phenotypes (diffuse vs intestinal), and ethnicity (Asians vs North Americans). Immunohistochemistry was performed to assess the expression of Gal-3 in human GACs and we correlated it to the clinical outcomes. Cell proliferation, invasion, co-immunoprecipitation and kinase activity assays were done in genetically stable Gal-3 overexpressing GC cell lines and the parental counterparts to delineate the mechanisms of action and activity of inhibitors.RESULTS:
Most patients were men, Asian, and had a poorly differentiated GAC. Gal-3 was over-expressed in poorly differentiated (P=0.002) tumours and also in diffuse sub-phenotype (P=0.02). Gal-3 overexpression was associated with shorter overall survival (OS; P=0.026) in all patients. Although, Gal-3 over-expression was not prognostic in the Asian cohort (P=0.337), it was highly prognostic in the North American cohort (P=0.001). In a multivariate analysis, Gal-3 (P=0.001) and N-stage (P=<0.001) were independently prognostic for shorter OS. Mechanistically, Gal-3 induced c-MYC expression through increasing RalA activity and an enhanced YAP1/RalA/RalBP complex to confer an aggressive phenotype. YAP1/BET bromodomain inhibitors reduced Gal-3-mediated aggressive phenotypes in GAC cells.CONCLUSIONS:
Gal-3 is an independent prognostic marker of shorter OS and a novel therapeutic target particularly in diffuse type GAC in North American patients.
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Neoplasias Gástricas
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Biomarcadores Tumorais
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Regulação para Cima
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Galectina 3
Tipo de estudo:
Prognostic_studies
Limite:
Female
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Humans
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Male
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article