CSNK1D and head and neck squamous cell carcinoma: To investigate the effects of CSNK1D on the HNSCC cells, we constructed the si-RNA to knockdown (si-CSNK1D) or overexpression lentivirus to overexpress the CSNK1D (OE-CSNK1D) in the cells, which inhibited or enhanced the levels of CSNK1D protein (Fig. 2b) and mRNA (Fig. S1c, d).