Additional file 8: Figure S8. The correlation between SOD2 and COX4-1. (A) Inverse correlation was noted between COX4–1 and SOD2 in GBM from a web-serve GEPIA ( http://gepia.cancer-pku.cn/ ) using TCGA database (P = 0.03). (B) Levels of COX4–1 and SOD2 in U87MG (left) or A172 (right) were compared to their resistant cells (r#10 or r#6, respectively). The detection was through qPCR for triplicated experiment with standard error shown in the bar graph. (COX4–1 primers: F:5′-GAACGAGTGGAAGACGGTTG, R:5′-GGTTCACCTTCATGTCCAGC).