INSM1 and astrocytoma (excluding glioblastoma): INSM1 expression did not differ between astrocytic and oligodendroglial tumours but it was significantly higher in grade 4 astrocytomas when compared to grade 2 and 3 tumours (median mHS 86.3 vs. 4 and 1.5, p = 0.007, KW, Figure 3B).