HOXC9 and cancer: The results showed that some HOX genes in pan-cancer had significant strong correlation (R≥0.8; Figures 2C–F): HOXA9 with HOXA10, HOXB5 with HOXB6 and HOXB8, HOXB8 with HOXB6 and HOXB9, HOXB3 with HOXB4 and HOXB5 and HOXB6, HOXC8 with HOXC9, HOXC9 with HOXC10, HOXD10 with HOXD11.