Association of p53/p21 expression with cigarette smoking and prognosis in esophageal squamous cell carcinoma patients

Figure 1 Immunohistochemical staining for p53 in an esophageal squamous cell carcinoma exhibiting expression. A: With primary antibody, showing reactivity (brown nuclear staining of some tumor cells) (× 100); B: With primary antibody, showing reactivity (× 400); C: With primary antibody, no reactivity (× 100). Sections were counter-stained with hematoxylin.