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JOURNAL ARTICLE
REVIEW
Immunohistochemical correlates of recurrent genetic alterations in sarcomas.
Genes, Chromosomes & Cancer 2019 Februrary
Accurate diagnosis of sarcomas relies on the integration of clinical, histopathological and molecular features. Our understanding of the latter has increased dramatically in recent years with the application of high-throughput sequencing. Concomitantly, the role of immunohistochemistry has expanded as genomic alterations have been exploited by the development of diagnostic markers that serve as surrogates for their detection. Herein, we review selected immunohistochemical markers that can infer the presence of diverse molecular events. These include gene fusions in vascular neoplasms (FOSB, CAMTA1 and TFE3), round cell sarcomas (BCOR, DUX4 and WT1), and fibroblastic/myofibroblastic tumors (STAT6, ALK and Pan-TRK); amplifications in well-differentiated and dedifferentiated liposarcomas (MDM2 and CDK4); and deletions in several aggressive neoplasms (SMARCB1 and SMARCA4). Protein correlates of single nucleotide variants (beta-catenin in desmoid fibromatosis) and epigenetic alterations (histone H3K27me3 in malignant peripheral nerve sheath tumor) and markers discovered through gene expression profiling (NKX2.2 and MUC4) are also discussed.
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