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. 2011 Aug 7;2:435–442. doi: 10.7150/jca.2.435

Table 2.

Synergistic Effect of Erlotinib and Gemcitabine in Cell Lines with Intrinsic Erlotinib Resistance

		Combination Indices
	Cell Line	ED₅₀	ED₇₅	ED₉₀	Dm
Mixture	BT-549	0.39275	0.26629	0.18403	6.89283
	MDA-MB-468	0.81612	0.70875	0.65044	2.88089
	MDA-MB-231	0.70510	0.55634	0.45635	2.42506
Erlotinib	BT-549				23.59856
(µM)	MDA-MB-468				8.90787
	MDA-MB-231				25.7763
Gemcitabine	BT-549				342.3832
(nM)	MDA-MB-468				29.2352
	MDA-MB-231				10.3228