Table 2. Combination Index Determination for 1 and 3 Cotreatment in U937 and RH4 Cells.

U937				RH4
μM				μM
1	3	FAa	CIb	1	3	FAa	CIb
0.01	1	0.05	3.34	0.05	10	0.27	0.64
0.1	10	0.68	0.14	0.1	20	0.45	0.49
0.25	25	0.92	0.04	0.25	50	0.63	0.54

^aFA, fraction affected.

^bCI, combination index.