To verify the results from scRNA‐seq, we performed ELISA for the levels of CEACAM6 in the CSF from 40 LUAD‐LM patients (male: 42.5%, median age of 57.0 years with IQR of 50.0–65.8 years) and 44 controls with normal results of routine CSF examination and cytology (male: 52.3%, median age of 50.0 years with IQR of 37.0–58.8 years) (Table S1). The gene discussed is CEACAM6; the disease is lymphangioma.