Furthermore, the downregulated expression level of MAOA was relevant to age (≥ 60), race (Asian), tumor metastasis status (M0), neoplasm histologic grade (G1>G2>G3>G4), and AFP concentration (>20 ng/mL) (all with P‐values <0.05; Table S2; Figure S9A‐E). Here, AFP is linked to neoplasm.