Fig. 1

Expression of cell cycle-associated proteins in oropharyngeal squamous cell carcinoma. Histological findings (a, b) and expression of the p16^INK4a (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×