Prognostic Worth of Epidermal Growth Factor Receptor (EGFR) in Patients with Head and Neck Tumors

Figure 4

Immunohistochemistry expressions of EGFR in tumor tissues. (a) Negative EGFR (0). (b) Weak levels of EGFR (1+). (c) Moderate levels of EGFR (2+). (d) High levels of EGFR (3+). The data were produced from 3-5 fields per slide. Magnification ×400.

(a)

(b)

(c)

(d)