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Fig. 2 | BMC Cancer

Fig. 2

From: The prognostic value of serum CA 19-9 for patients with advanced lung adenocarcinoma

Fig. 2

Patient selection and exclusion criteria. Patients were stratified into 3 groups by their serum tumor markers: double positive (Double +): CA 19-9+/CYFRA 21-1+; single positive (Single +): either CA 19-9+ or CYFRA 21-1+; and double negative (Double −): CA 19-9/CYFRA 21-1. Median survival time of each group is indicated in months (with ranges). ALAD: advanced lung adenocarcinoma; CYFRA 21-1: cytokeratin 19 fragments; CA 19-9: carbohydrate antigen 19-9; + positive; −: negative; MST: median survival time

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