Loss of BRG1 Protein Expression

**Semantic type:** Laboratory or Test Result

**Definition:** An immunohistochemical finding indicating negative staining of tumor cells for BRG1 protein, resulting from the mutation of the SMARCA4 gene.

**Synonyms:** - Loss of ATP-Dependent Helicase SMARCA4 Protein Expression - Loss of BAF190A Protein Expression - Loss of BRG-1 Protein Expression - Loss of Brahma Protein Homolog 1 Protein Expression - Loss of Possible Global Transcription Activator SNF2L4 Protein Expression - Loss of Protein Brahma Homolog 1 Protein Expression - Loss of SMARCA4 Protein Expression - Loss of SNF2-Beta Protein Expression - Loss of SWI/SNF-Related Matrix-Associated Actin-Dependent Regulator of Chromatin Subfamily A Member 4 Protein Expression