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Number of OAPs counted per 4 µm2 in astrocytoma WHO grade II, III and IV IDH1-negative glioblastoma. The number of OAPs in astrocytoma WHO grade II is significant higher than in astrocytoma WHO grade III (p = 0.028) and glioblastoma (p = 0.0006). * p ≤ 0.05, *** p ≤ 0.001.
