Table 1.

Radiobiological parameters in different groups

Groupings	D0	Dq	SF2
MDA-MB-435 s	1.372 ± 0.012	0.413 ± 0.033	0.365 ± 0.008
MDA-MB-435 s R60/2	3.782 ± 0.041*	0.667 ± 0.015*	0.646 ± 0.024*
MDA-MB-435 s R60/6	2.563 ± 0.028*	0.593 ± 0.189*	0.534 ± 0.006*

Data were fit into the single-hit multi-target model, and survival curves of both groups were drawn by Graphpad Prism, the SF2, D0, Dq values were calculated (pD0, Dq, SF2 < 0.05). Data were expressed as the mean ± SD. * p <0.05 were considered significant. D0: mean lethal dose, Dq: quasi-threshold dose, SF: surviving fraction.