Fig. 1

Expression of cell cycle-associated proteins in oropharyngeal squamous cell carcinoma. Histological findings (a, b) and expression of the p16INK4a (c, d), pRB (e, f), cyclin D1 (g, h) and p53 (i, j) proteins in representative HR-HPV positive (b, d, f, h, j) and HR-HPV negative OPSCC (a, c, e, g, i). Original magnification, 400×