Cytosensitivity to cisplatin in representative 4000-cell group evaluated by MTT assay. The values presented from three independent experiments, each performed in triplicate. These values stand for IC50 values to cisplatin in each cell group. Data are expressed as mean ą S.D. *p < 0.05 but #p

Table 1: Cytosensitivity to cisplatin in representative 4000-cell group evaluated by MTT assay. The values presented from three independent experiments, each performed in triplicate. These values stand for IC50 values to cisplatin in each cell group. Data are expressed as mean ± S.D. ^*p < 0.05 but ^#p > 0.05 when compared with average IC50s.

	IC50 values to cisplatin (mean ± S.D)
Cell group	2008	C13	Mixed cells	Average IC50 (2008 and C13)	Ratio of IC50s of (mixed group/average) (%)
Day 2	11.88 ± 3.54	768.36 ± 23.65	32.52 ± 5.66^*	390.12 ± 18.45	0.08
Day 3	0.99 ± 0.23	6.60 ± 1.03	1.74 ± 0.34^*	3.80 ± 0.78	0.46
Day 4	0.50 ± 0.12	1.04 ± 0.35	0.55 ± 0.23^*	0.77 ± 0.24	0.71
Day 5	0.44 ± 0.09	0.63 ± 0.11	0.45 ± 0.24^*	0.54 ± 0.17	0.84
Day 6	0.33 ± 0.13	0.54 ± 0.07	0.44 ± 0.17^#	0.43 ± 0.11	1.03
Day 7	0.28 ± 0.07	0.42 ± 0.09	0.36 ± 0.10^#	0.35 ± 0.08	1.04