In addition, we found that the protein expression level of CYP27C1 was relatively higher in A549 (p = 0.0037), H1299 (p = 0.0177) and H1975 (p = 0.0431) in comparison with BEAS-2B cells (Figure 1B,C), indicating that the mRNA and protein expression level of CYP27C1 is aberrant in some human lung cancer cells. Here, CYP27C1 is linked to lung cancer.