EGFR and neoplasm: Consequently, we selected two human tumor cell lines having high to intermedium EGFR expression levels, A431 that express 2–3 × 106 EGFR molecules per cell (Haigler et al., 1978) and H125 that express 2.1 × 105 EGFR molecules per cell (Suarez Pestana et al., 1997).