Table 1. Efficiency of single cell-derived colony formation from a HeLa cell in soft agar culture with or without hMSCs (12,500 and 62,500 cells).

	HeLa	HeLa/hMSCs (12,500)	HeLa/hMSCs (62,500)	hMSCs (12,500)	hMSCs (62,500)
Efficiency of colony formation (%)	44.7 ± 2.2a	68.8 ± 9.2#	70.0 ± 3.4#	Not detected	Not detected

^aThe ratio of the total number of colonies to the number of transformed cells dispensed in a 96-well plate were defined as the colony-forming efficiency of transformed cells in soft agar culture. Values are means ± SD of three experiments. Statistical significance was determined using one-way ANOVA and Dunnett’s multiple comparisons test (^#P < 0.05, compared with the HeLa cell alone group). hMSCs, human mesenchymal stem cells.