SRSF1 and ependymoma: We found high SRSF1 expression levels in most oligodendrogliomas (15/21; 71%), SEGAs (4/5; 80%) and PXAs (3/4; 75%), an absence of SRSF1 staining in 13/15 (87%) ependymomas and in 10/15 (67%) PAs; the remaining ependymoma (2/15) and PA (2/15) cases showed weak SRSF1 expression.