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. Author manuscript; available in PMC: 2012 Aug 10.
Published in final edited form as: J Control Release. 2011 May 7;153(3):288–296. doi: 10.1016/j.jconrel.2011.05.005

Table 1.

FOA + IRN Combination Activity in C26 Cells

Drug Combination Ratios Combination Index*

EC50 EC75 EC90

FOA + IRN 1:10 1.1 0.99 0.89
1:5 1.3 1.2 1.2
1:1 1.3 1.2 1.1
5:1 0.20 0.16 0.13
10:1 0.89 0.88 0.88
*

Combination Index is a quantity derived from the median effect equation that describes the degree of a drug interaction. Synergism is indicated for CI < 0.9 (Green), additivity for 0.9 < CI < 1.1 (Yellow), and antagonism for CI > 1.1 (Red).