HOXD12 and oligodendroglioma: Older (≥ 45 years old) CGGA oligodendroglioma patients were significantly enriched for HOXD12-positive patients (p = 0.03, Fisher’s), and HOXD12-positive status was prognostic in the CGGA (p < 0.001, log-rank), incurring a similar hazard ratio (HR) as observed in the TCGA (TCGA HR = 9.3, CGGA HR = 8.4).