TPH1 and colorectal carcinoma: The expression levels of CA10 (p = 0.008), HTR4 (p = 0.028), NRAP (p = 0.031), CLDN19 (p = 0.041), COL18A1 (p = 0.047), SMKR1 (p = 0.039), and TPH (p = 0.0027) were significantly correlated with the survival rates of CRC patients (Fig. 5g–m).