Overall, 12 DCB genes were identified in lung cancer samples (SLC34A2, GABRG1, ROS1, AGR2, GNAT3, SFTPA2, MUC5B, SFTA3, SMIM22, CXCL17, BPIFA1, WFDC2), and 8 DCB genes were identified in breast cancer samples (CSN1S1, FABP7, OPN1SW, SCGB2A2, LALBA, CASP14, KLK5, WFDC2) (Fig. 3). Here, WFDC2 is linked to lung cancer.