Table 2. Cell cycle perturbation (%) induced by gemcitabine and topotecan. Data represent mean percentage from three independent experiments.

Cells	Treatment	G1 (%)	S (%)	G2 (%)
A549	Control	46.06	39.58	14.36
	Gemcitabine	51.91	33.45	14.64
	Topotecan	33.42	64.89	1.69
Calu-6	Control	50.46	35.01	14.54
	Gemcitabine	64.10	31.62	4.27
	Topotecan	45.91	41.08	13.01