Table III.

Intracellular drug concentrations of SP and NSP cells.

	Drug, µg/ml
Cell	DDP	5-Fu	VP-16	NVB	GEM
SP	0.090±0.007	0.054±0.005	0.491±0.008	0.986±0.056	0.179±0.009
NSP	0.095±0.005	0.098±0.005	0.787±0.016	2.804±0.072	0.371±0.130
t-test	−0.957	11.161	−27.904	−35.224	27.681
P-value	0.393	<0.001	<0.001	<0.001	<0.001

SP, side population; NSP, non-side population; DDP, cisplatin; 5-Fu, 5-fluorouracil; VP-16, etoposide; NVB, vinorelbine; GEM, gemcitabine.