Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/3171
Título: Response of high-risk of recurrence/progression bladder tumours expressing sialyl-Tn and sialyl-6-T to BCG immunotherapy
Autor: Lima, Luís
Severino, Paulo
Silva, Mariana
Miranda, Andreia
Tavares, Ana
Pereira, Sofia
Fernandes, Elisabete
Cruz, Ricardo
Amaro, Teresina
Reis, Celso
Dall'Olio, Fabio
Amado, Francisco
Videira, Paula
Santos, Lúcio
Ferreira, José Alexandre
Palavras-chave: Bacillus Calmette-Guerin
BCG immunotherapy
Bladder Cancer
Sialyl-Tn
Sialyl-6-T
Tumor glycosylation
Data: 2013
Editora: Cancer Research UK
Relatório da Série N.º: British Journal of Cancer; Vol. 109
Resumo: High risk of recurrence/progression bladder tumours is treated with Bacillus Calmette-Guérin (BCG) immunotherapy after complete resection of the tumour. Approximately 75% of these tumours express the uncommon carbohydrate antigen sialyl-Tn (Tn), a surrogate biomarker of tumour aggressiveness. Such changes in the glycosylation of cell-surface proteins influence tumour microenvironment and immune responses that may modulate treatment outcome and the course of disease. The aim of this work is to determine the efficiency of BCG immunotherapy against tumours expressing sTn and sTn-related antigen sialyl-6-T (s6T). METHODS: In a retrospective design, 94 tumours from patients treated with BCG were screened for sTn and s6T expression. In vitro studies were conducted to determine the interaction of BCG with high-grade bladder cancer cell line overexpressing sTn. RESULTS: From the 94 cases evaluated, 36 had recurrence after BCG treatment (38.3%). Treatment outcome was influenced by age over 65 years (HR=2.668; (1.344-5.254); P=0.005), maintenance schedule (HR=0.480; (0.246-0.936); P=0.031) and multifocality (HR=2.065; (1.033-4.126); P=0.040). sTn or s6T expression was associated with BCG response (P=0.024; P<0.0001) and with increased recurrence-free survival (P=0.001). Multivariate analyses showed that sTn and/or s6T were independent predictive markers of recurrence after BCG immunotherapy (HR=0.296; (0.148-0.594); P=0.001). In vitro studies demonstrated higher adhesion and internalisation of the bacillus to cells expressing sTn, promoting cell death. CONCLUSION: s6T is described for the first time in bladder tumours. Our data strongly suggest that BCG immunotherapy is efficient against sTn- and s6T-positive tumours. Furthermore, sTn and s6T expression are independent predictive markers of BCG treatment response and may be useful in the identification of patients who could benefit more from this immunotherapy.
Peer review: yes
URI: http://hdl.handle.net/10400.22/3171
Versão do Editor: http://www.nature.com/bjc/journal/v109/n8/full/bjc2013571a.html
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