Table 1. Gene expression profiling in mammary gland tissue exposed to low and high doses of ionizing radiation.

The number of significantly changed genes in the rat mammary gland upon low energy level/low dose (30kVp/0.1 Gy), high energy level/low dose (80kVp/0.1 Gy), high energy level/medium dose (80kVp/1 Gy) and high energy level/high dose (80 kVp/2.5 Gy) of radiation in comparison to their corresponding un-irradiated controls at 96 hours and 24 weeks time points, as identified by the gene expression profiling analysis.

Treatment Group	96 hours			24 weeks
	Total number of genes changed	Number of up-regulated genes	Number of down-regulated genes	Total number of genes changed	Number of up-regulated genes	Number of down-regulated genes
30 kVp/0.1 Gy	14	8	6	22	8	14
80 kVp/0.1 Gy	567	295	272	37	10	27
80 kVp/1 Gy	3	3	0	20	7	13
80 kVp/2.5 Gy	32	13	19	51	28	23