Table 2.

TGF-B1 levels before and during radiation treatment

RIF	Time	TGF-B1 Value	P-value
Any	Prior to surgery	32,273 ± 5,016	< 0.0001
	Prior to APBI	20,339 ± 6,775	0.22
	During APBI	29,178 ± 5,113	0.52
None-to-Mild RIF	Prior to surgery	26,715 + 4,291	0.14
	Prior to APBI	20,261 ± 8,415	0.30
	During APBI	27,638 ± 4,059	0.77
Severe RIF	Prior to surgery	34,468 ± 4,713	< 0.0001
	Prior to APBI	17,886 ± 3,953	0.007
	During APBI	23,411 ± 3,030	0.87

Abbreviations: TGF-β1 = transforming growth factor; RIF = radiation induced fibrosis; APBI: acceleration partial breast irradiation