ITGB1 and choroid plexus papilloma: In a study evaluating the expression of ITGβ-1 in normal and neoplastic human brains, an increase in ITGβ1 expression was reported in neoplastic astrocytes in vivo and in vitro, while a similar ITGβ-1 pattern was observed in oligodendroglioma, ependymoma, choroid plexus papilloma, pituitary adenoma, and meningioma cells as in normal cells [57].