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Open AccessArticle

BRAF Mutation in Colorectal Rhabdoid and Poorly Differentiated Medullary Carcinomas

1
Unit of Oncology, ASST-Lariana, 22100 Como, Italy
2
Unit of Pathology, Department of Medicine and Surgery and Research Center for the Study of Hereditary and Familial tumors, University of Insubria, 21100 Varese, Italy
3
Unit of Oncology, ASST-Sette Laghi, 21100 Varese, Italy
4
Royal North Shore Hospital St Leonards, Cancer Diagnosis and Pathology Group, Kolling Institute of Medical Research, University of Sydney, Sydney NSW 2006, Australia
5
Unit of Pathology, Ospedale San Raffaele, 20100 Milan, Italy
*
Author to whom correspondence should be addressed.
These authors contributed equally to the work.
Cancers 2019, 11(9), 1252; https://doi.org/10.3390/cancers11091252
Received: 14 July 2019 / Revised: 9 August 2019 / Accepted: 20 August 2019 / Published: 26 August 2019
(This article belongs to the Special Issue Oncogenic Forms of BRAF as Cancer Driver Genes)
Colorectal rhabdoid carcinomas (CRbCs) are very rare and aggressive cancers. The BRAF mutation and CpG island methylator phenotype have been reported to be common features of CRbCs. This study reviews the literature about CRbCs and analyzes the clinicopathological and molecular profiles of seven CRbCs characterized by large discohesive cells with abundant eosinophilic cytoplasm, showing hyaline inclusions and large rounded to bean-shaped nuclei. For comparison, we included four poorly differentiated medullary carcinomas (PDMCs) with focal aspects mimicking rhabdoid features. Overall survival was poor in both subsets, with 78% of patients dying of disease within 2–11 months. The main features of CRbCs were: Loss of/reduced SMARCB1/INI expression, intense vimentin immunostaining, and dense neutrophilic infiltration. The PDMCs were positive for pancytokeratin but negative for vimentin and showed moderate peritumoral/intratumoral CD8+ lymphocytes. All PDMCs showed SMARCB1(INI-1) expression. The coexistence of BRAF and TP53 mutations was observed in 80% of CRbCs and PDMCs. PDMCs always showed microsatellite instability and CpG island methylator phenotype (CIMP), while CRbCs were CIMP negative and exhibited microsatellite instability (MSI) in two out of seven cases. CRbCs are characterized by BRAF and TP53 mutations. Loss/reduced expression of nuclear SMARCB1/INI, intense vimentin immunostaining, dense neutrophilic infiltration, and low frequency of CIMP are useful markers to recognize these rare aggressive tumors. View Full-Text
Keywords: BRAF; colorectal rhabdoid carcinomas; microsatellite instability; CpG island methylator phenotype; SMARCB1 BRAF; colorectal rhabdoid carcinomas; microsatellite instability; CpG island methylator phenotype; SMARCB1
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Bolzacchini, E.; Digiacomo, N.; Marrazzo, C.; Sahnane, N.; Maragliano, R.; Gill, A.; Albarello, L.; Sessa, F.; Furlan, D.; Capella, C. BRAF Mutation in Colorectal Rhabdoid and Poorly Differentiated Medullary Carcinomas. Cancers 2019, 11, 1252.

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