NDRG4 and colorectal cancer: As normalized to 18s rRNA, the RQ (standing for relative expression obtained by 2−ΔΔCt method) of NDRG4 mRNA in colorectal cancer samples was 1.12 ± 0.15 (mean ± SD), while the relative NDRG4 mRNA expression detected in matched adjacent normal tissues was 1.87 ± 0.21.