Association of microsatellite instability (MSI) status with the 5-year outcome and genetic ancestry in a large Brazilian cohort of colorectal cancer

Autor(es)

Berardinelli, Gustavo Noriz ; Duraes, Ronilson ; da Costa, Allini Mafra ; Bragagnoli, Arinilda ; de Oliveira, Marco Antonio ; Pereira, Rui ; Scapulatempo-Neto, Cristovam ; Guimaraes, Denise Peixoto ; Reis, Rui Manuel

• Tipo de documento: Artigo Científico
• Fonte: European Journal of Human Genetics; v. N/A, p. 9-pg., 2022-04-26.

Resumo

Colorectal cancer (CRC) has a high incidence and mortality worldwide. Microsatellite instability (MSI) is crucial in CRC, with distinct molecular and clinicopathological features in patients. Nowadays, it is a predictive marker for immunotherapy. We proposed to evaluate the 5-year outcome of MSI status in 1002 Brazilian CRC, and associate it with genetic ancestry, molecular and clinicopathological features. MSI evaluation was performed using molecular markers. MSI+ tumors were analyzed for alterations in 23 MSI-targeted genes. Genetic ancestry was evaluated using an Ancestry-Informative markers panel. MSI status was analyzed in relation to CRC specific survival and other clinical and genetic variables. MSI+ status was observed in 10.5% of cases. MSI+ status was significantly associated with the anatomic site right colon, mucinous histological type, clinical stage II, histological grade III/undifferentiated, no recurrence of disease, and live cases without cancer. No association of MSI status with genetic ancestry components was observed. MSI-targeted genes analyses showed the most frequently altered genes: ATM, EGFR, MRE11, ROCK1, and TGFBRII. There was a statistically significant difference in cancer-specific survival between cases according to MSI status. This study constitutes the most comprehensive analyses of the MSI impact on the Brazilian CRC. MSI+ frequency in Brazilian CRC agreed with the literature and was associated with several clinicopathological features related with less aggressive tumors, independently of their genetic ancestry. (AU)

• Processo FAPESP: 18/22097-0 - Neoplasias malignas nas 18 cidades pertencentes à regional de saúde de Barretos, São Paulo: a importância de um Registro de Câncer de Base Populacional
• Beneficiário: Allini Mafra da Costa
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 19/21722-0 - Sobrevida de câncer no noroeste do estado de São Paulo (Brasil): um estudo de base populacional
• Beneficiário: Allini Mafra da Costa
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado