Fig. 1From: Human papillomavirus is not associated to non-small cell lung cancer: data from a prospective cross-sectional studyImmunohistochemical staining of tumor for p16 expression. a Adenocarcinoma cervical used as positive control. b NSCLC sample scored as negative p16 expression. c NSCLC sample considered as positive p16 expression. As cell proliferation nuclear marker was used Ki-67. Magnification: × 20Back to article page