Moreover, liquid biopsies using eight protein tumor markers (CA125, CA15.3, CEA, CYFRA 21‐1, HE4, NSE, proGRP, and SCCA) could detect lung cancer, NSCLC, and SCLC with 46, 25, and 40% SEN, respectively. The gene discussed is WFDC2; the disease is small cell lung carcinoma.