Figure 2From: Rare case of malignant transformation of recurrent respiratory papillomatosis associated with human papillomavirus type 6 infection and p53 overexpression Immunohistochemical analysis of p16. The specimens obtained from the larynx in 1989 (A), 1994 (B), 2000 (C), 2005 (D),and 2011 (E), and from the tumor tissue around the tracheotomy aperture in 2011 (F).Back to article page