CYP19A1 and astrocytoma (excluding glioblastoma): The expression of the enzyme responsible for oestrogen biosynthesis, P450‐ aromatase (P450arom), in human and rat glioblastoma cell lines was described by Yague et al.12Furthermore, Dueñas Jiménez et al.13proposed this enzyme as a prognostic biomarker in astrocytoma patients.