Levels of keratins, type I cytoskeletal 16 (KRT16), 9 (KRT9), and 10 (KRT10), as well as complement factor H‐related protein 4 (CFHR4) and 1 (CFHR1), had higher levels in plasma samples from patients with cancer in the right colon (with fold changes between 6.2‐13.0). This evidence concerns the gene KRT9 and cancer.