Table 1.

CI values of DHA at concentrations applied in combination with CQ in Hela and HCT116 cells

Hela			HCT116
DHA (μM)	CQ (μM)	Combination index	DHA (μM)	CQ (μM)	Combination index
2.5	1.25	0.899	2.5	1.25	0.487
5	2.5	0.538	5	2.5	0.446
10	5	0.315	10	5	0.544
20	10	0.335	20	10	0.485
40	20	0.351	40	20	0.289
80	40	0.396	80	40	0.126

A CI less than 0.90 indicates synergism; 0.10, very strong synergism; 0.10–0.30, strong synergism; 0.30–0.70, synergism; 0.70–0.85, moderate synergism; 0.85–0.9, slight synergism; 0.90–1.10, additive; and more than 1.10, antagonism.