WFDC2 and lymphangioma: An average of 816.50 ± 75.36 pmol/L of CSF HE4 protein were detected in LUAD LM patients, more than 10-fold higher than that in the Wiot-LM (81.80 ± 10.64 pmol/L) and control (55.91 ± 4.26 pmol/L) groups (Figure 2A).