Fig. 4: Expression of p53 by immunohistochemistry in PPB.

Separate cases of PPB paired with p53 immunostains showing various degrees of expression: 0%, group 0 (a, b); 10%, group 1 (1–25%) (c, d); 50% group 3 (26–75%) (e, f); 80% (g, h); and 100%, group 4 (76–100%) (i, j).