Variations of circulating endothelial progenitor cells and transforming growth factor-beta-1 (TGF-β1) during thoracic radiotherapy are predictive for radiation pneumonitis

Table 3 Comparison of TGF-β1 and EPCs at baseline in patients with and without RP

Levels at baseline	RP	No RP	P ^*
Levels at baseline	Mean SD	Mean SD	P ^*
TGF-β1, ng/ml	4.54 ± 0.78	4.60 ± 0.89	0.73
EPCs, cells/ml	1201.4 ± 311.70	1164.6 ± 349.90	0.62

Abbreviations: RP: radiation pneumonitis, SD: standard deviation, TGF- β1: transforming growth factor-beta-1, EPCs: endothelial progenitor cells.
^* Independent-samples T test.

ISSN: 1748-717X