Fig. 7.

Tumor growth delay studies demonstrating the effects of the very low radiation dose induced adaptive responses in SA-NH and FSa tumors. Each tumor type is compared to their respective unirradiated control tumor growth curve. Irradiations, designated by (↓), were performed after tumors reached a volume of approximately 250 mm³ and tumor growth was monitored daily until they reached a volume of about 1000 mm³. Mean growth times and SEM were determined. Mean tumor volumes over time were compared among groups using repeated measures analysis of covariance (ANOVA) assuming a quadratic model and accounting for separate variances in each group. A post-hoc pairwise comparison among groups was performed using the Tukey-Kramer method.