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Scheme of morphological progression of lung adenocarcinoma with bronchioloalveolar adenocarcinoma (BAC) component. •, OCIAD2‐negative cells; ○, OCIAD2‐positive cells. 
Malignant progression from BAC to adenocarcinoma mixed subtype with BAC component, a proportion of BAC begin to express OCIAD2. 
OCIAD2 becomes expressed when the tumor progressed from BAC to adenocarcinoma mixed subtype with BAC component, but the expression decreases in accordance with malignant progression.
