COL1A2 and glioblastoma: For example, STCs exhibited, compared to STPs, the overexpression of several markers of the mesenchymal subtype of glioblastoma [13], such as COL1A1, COL1A2, COL5A1, IGFBP6, DCBLD2, many of which are also typically expressed by microglia or reactive astrocytes in glioblastoma microenvironment [10].