For example, 12‐o‐tetradecanoylphorbol‐13‐acetate (TPA) decreases RCN1 expression in the hypodifferentiated nasopharyngeal carcinoma squamous cell carcinoma cell line CNE2 cells [66], suberonylanilide hydroxamic acid (SAHA) decreases RCN1 expression in HepG2 cancer cells [67], and all‐trans retinoic acid significantly downregulates RCN1 expression in neuroblastoma SJ‐NK‐P cells [68]. Here, RCN1 is linked to squamous cell carcinoma.