CDH1 and meningioma: Evidence supporting more specifically inner dura cells as a meningioma progenitor cell, was that they (1) expressed CDH1, as did meningioma, (2) were located in the meningeal barrier, consistent with previous anatomical evidence, (3) histologically looked like arachnoid barrier cells, (4) of all the topics, inner dura cells (topic 30) were the most consistent in all meningiomas (Fig. 6), and (5) expressed cancer driver genes.