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Wnt Signalling-Targeted Therapy in the CMS2 Tumour Subtype: A New Paradigm in CRC Treatment?

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Targeted Therapy of Colorectal Cancer Subtypes

Part of the book series: Advances in Experimental Medicine and Biology ((AEMB,volume 1110))

Abstract

Colorectal cancers (CRC) belonging to the consensus molecular subtype 2 (CMS2) have the highest incidence rate, affect mainly the distal colon and rectum, and are characterized by marked Wnt/β-catenin/Transcription Factor 7-Like 2 (TCF7L2) pathway activation and also by activation of epidermal growth factor receptor (EGFR) signalling. Despite having the highest overall survival, CMS2 tumours are often diagnosed at stage III when an adjuvant chemotherapy-based regimen is recommended. Nevertheless, colorectal cancer stem cells (CSCs) and circulating tumour cells may still evade the current therapeutic options and metastasize, stressing the need to develop more tailored therapeutic strategies. For example, activation of EGFR signalling is being used as a target for tailored therapy, however, therapy resistance is frequently observed. Therefore, targeting the Wnt signalling axis represents an additional therapeutic strategy, considering that CMS2 tumours are “Wnt-addicted”. Several efforts have been made to identify Wnt antagonists, either of synthetic or natural origin. However, an inverse gradient of Wnt/β-catenin/TCF7L2 signalling activity during CRC progression has been suggested, with early stage and metastatic tumours displaying high and low Wnt signalling activities, respectively, which lead us to revisit the “just-right” signalling model. This may pinpoint the use of Wnt signalling agonists instead of antagonists for treatment of metastatic stages, in a context-dependent fashion. Moreover, the poor immunogenicity of these tumours challenges the use of recently emerged immunotherapies. This chapter makes a journey about CMS2 tumour characterization, their conventional treatment, and how modulation of Wnt signalling or immune response may be applied to CRC therapy. It describes the newest findings in this field and indicates where more research is required.

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Acknowledgments

The authors would like to thank the funding from Liga Portuguesa Contra o Cancro – Núcleo Regional do Sul (Portuguese League Against Cancer – South Regional Nucleus) assigned as an Oncology Research Scholarship (LPCC/FUNDAÇÃO PT – 2017) granted to Lucília Pebre Pereira. Support from Instituto Português de Oncologia de Lisboa Francisco Gentil, E.P.E (Portuguese Institute of Oncology of Lisbon Francisco Gentil, E.P.E.), is also acknowledged.

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Albuquerque, C., Pebre Pereira, L. (2018). Wnt Signalling-Targeted Therapy in the CMS2 Tumour Subtype: A New Paradigm in CRC Treatment?. In: Jordan, P. (eds) Targeted Therapy of Colorectal Cancer Subtypes. Advances in Experimental Medicine and Biology, vol 1110. Springer, Cham. https://doi.org/10.1007/978-3-030-02771-1_6

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