The in vivo study on the radiobiologic effect of prolonged delivery time to tumor control in C57BL mice implanted with Lewis lung cancer

Table 2 The survival time of each group (days)

Radiation schedule	survival time (days) ± SE	p value
Control	13.8 ± 2.4	<0.001
18 Gy as a single dose	28.8 ± 2.3
9 Gy× 2 fractions at 60 min intervals	23.5 ± 3.7	0.011
2.57 Gy×7 at 10 min intervals	23.5 ± 3.7	0.004
9 Gy× 2 fractions at 30 min intervals	25.0 ± 2.9	0.026
2.57 Gy×7 at 5 min intervals	24.8 ± 2.8	0.027

The survival time of each group was compared with the group irradiated with 18 Gy single fraction. Each date represents mean ± SE. We also compared the last four groups by chi-square test, the F value is 0.428 and p value is 0.735. (data not shown in this table)

ISSN: 1748-717X