Table 1.

Tumor growth time* compared to 18 Gy in a sigle fraction

Radiation schedule	TGT (days) ± SE	p value
Control	8.1 ± 0.6	<0.001
18 Gy as a single dose	19.9 ± 2.3
9 Gy× 2 fractions at 60 min intervals	14.0 ± 1.8	<0.001
2.57 Gy×7 at 10 min intervals	14.3 ± 1.8	<0.001
9 Gy× 2 fractions at 30 min intervals	17.7 ± 2.5	0.034
2.57 Gy×7 at 5 min intervals	17.7 ± 2.6	0.037

* The tumor growth time (TGT) was defined as the time required for the initial tumor size to quadruple after treatment. Each date represents mean ± SE.