Table 1. Characterization of cellular models.

Cell line	Origin	HPV status	HER1 (EGFR) expression	HER2 expression	HER3 expression	HER4 expression	Cetuximab sensitivity	Tumor-forming capacitiy in vivo
FaDu	HNSCC	−	++	+	+	−	++	+
UD-SCC-17B	HNSCC	−	++	+	+	−	−	−
UPCI:SCC-090	HNSCC	+	+	+	+	−	++	+
DU-SCC-2	HNSCC	+	+	(+)	−	−	−	−
DIFI	CRC	−	++	+	+	−	+++	+
A431	Epidermoid cell carcinoma	−	+++	+	(+)	−	+	+

−: negative; (+): weak positive; +: positive; ++: strong positive; +++: highest intensity