Table 1.

SCE^a frequency in DM^b-positive and -negative groups of tumor cell lines

Source	Cell line	DM incidence	Mean chromosome	SCE frequency
Ovarian tumor	UACC-1598	87 %	71.06 ± 18.01	12.26 ± 5.14
	HO-8910	0	65.28 ± 22.36	6.58 ± 3.36
Nervous tumor	SK-PN-DW	61 %	43.30 ± 13.81	7.40 ± 3.13
	U-251	0	59.66 ± 18.61	4.16 ± 2.31
Gastric tumor	NCI-N87	54 %	68.22 ± 14.97	7.00 ± 3.13
	MGC-803	0	54.88 ± 11.17	3.84 ± 1.92

(The data are the mean number of chromosome or SCE/cell ± standard deviation (SD)

^a: sister chromatid exchange; ^b: double minute chromosome)