Table 1. Characteristics of human head and neck squamous cell lines.

Cell lines	SQ20B	Cal33	Cal27	SCC61
SF2	0.76	0.67	0.47	0.39
IC50 ABT-737 (μM)	14.56 (± 1.67)	9.48 (± 1.01)	13.44 (± 1.37)	2.38 (± 0.38)
Protein expression (relative blot density to α-tubuline) (.10−7)
Bcl-2	1.11	4.28	1.89	3.94
Bcl-xL	4.52	2.98	3.71	1.21
Mcl-1	4.70	7.66	5.85	2.09
Bax	3.20	7.40	8.23	2.84
Bak	1.44	1.53	2.15	2.51
PUMA	0.70	0.89	0.40	0.98