Table 1. IC₅₀ values for cDDP and paclitaxel in NT2-D1 cells pretreated with retinoic acid.

	cDDP IC50 µM	Fold increase in IC50 induced by pretreatment	P Value	Paclitaxel IC50 µM	Fold increase in IC50 induced by pretreatment	P Value
NT2-D1 No pretreatment	0.23±0.01	1	-	0.0018±0.00001	1	-
NT2-D1 pretreated with 0.01 µM RA	0.40±0.04	1.7	<0.01	0.0018±0.00004	1	NS
NT2-D1 pretreated with 0.1 µM RA	3.05±0.61	13.3	<0.01	0.0026±0.00004	1.4	<0.001
NT2-D1 pretreated with 10 µM RA	4.28±0.28	18.6	<0.001	0.11±0.01	61	<0.01