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Serum CEA and CYFRA21‐1 expression levels in histological subtypes of lung adenocarcinoma. (A) Preoperative serum CEA differed across histological subtypes of LUAD; (B) MPA and SPA patients had higher percentages of abnormal CEA levels than LPA/APA/PPA; (C) CYFRA21‐1 levels varied according to LUAD subtypes; (D) Patients with SPA had a higher abnormal level of CYFRA21‐1 than those with other histological subtypes
