Table 1.

The PE of A549 and H1299 lung cancer cells without receiving irradiation in mono-culture, transwell and direct co-culture

Culture condition	A549 cells			H1299 cells
	PE	T value	P value	PE	T value	P value
Mono-culture	0.206±0.031			0.200±0.039
Transwell co-culture	0.210±0.007	0.219	>0.05	0.259±0.024	2.23	>0.05
Direct co-culture	0.352±0.023	6.577	<0.05	0.323±0.025	4.60	<0.05