As our sequencing data demonstrated that the normal INI1 gene was lost in the recurrent brain tumour and in the myoepithelioma, but remained in the meningioma, this staining pattern is consistent with the notion that the mutant allele does not encode INI1 protein or shortened INI1 protein as the consequence of exon-4-skipping. The gene discussed is SMARCB1; the disease is meningioma.