Fig. 1From: The prognostic value of serum CA 19-9 for patients with advanced lung adenocarcinoma a, b Stage I adenocarcinoma specimens (diastase-resistant periodic acid Schiff stain; × 400, A: negative; B: positive). c–f Immunohistochemical staining of stage I adenocarcinoma specimens with antibodies specific for 116-NS-19-9. Representative staining patterns for c: intensity 0; d: intensity 1; e: intensity 2; and f: intensity 3 (×400)Back to article page