EGFR and neoplasm: The mean gene amplifications of pure tumor cell samples (Figure 4C, grey bars) and of those isolated by On-chip Sort (Figure 4C, blue bars) were compared, and found to be reasonably similar to that observed in the cell lines with strong expression levels of EGFR (A431 and HC827; Figure 4C), whereas no significant amplification was detected in H292, which expresses moderate levels of EGFR (Figure 4C).