Table 1. Combination index (CI) with cisplatin and osthole in CD133⁺ Huh7.

Cisplatin single treatment		Osthole single treatment		Combination treatment	Combination index (CI)
Concentration (μM)	Inhibitory rate (%)	Concentration (μM)	Inhibitory rate (%)	Inhibitory rate (%)
1	2.1	2	3.8	20.4	3.51
2	4.4	4	4.9	32.6	3.59
5	8.7	10	6.3	55.2	3.82
10	16.5	20	8.8	62.8	2.63
15	22.7	30	12.6	67.6	2.08
20	28.8	40	14.5	73.4	1.88
30	37.9	60	16.3	79.5	1.66