COL6A1 and glioma: Moreover, Kaplan–Meier survival analyses demonstrated that glioma patients with high‐COL6A1 expression had significantly shorter OS (TCGA glioma: hazard ratio = 1.794, 95% confidence interval = 1.242–2.592, p < 0.001, Figure 4B; Rembrandt–Glioma: hazard ratio = 1.690, 95% confidence interval = 1.241–2.300, p < 0.001, Figure 4D).