. 2016 Aug 8;18(11):e32013. doi: 10.5812/ircmj.32013

Table 4. Results of the Regression Analysis for the Dose-Response Curve of the FDXR and RAD51 Genes and P Values for Significant Differences Between the 6 and 18 MV Beam Energies (1, 2).

Gene/Energy	Equation	R²	P Value
			0.2 Gy	0.5 Gy	2 Gy	4 Gy
FDXR/6 MV	y = -51.198 x² + 773.2 x + 743.75	0.9987	0.2 70^a	0.51 3^a	0.001^b	0.008^b
FDXR/18 MV	y = -243.23 x² + 2003.1 x + 897.15	0.9952	0.2 70^a	0.51 3^a	0.001^b	0.008^b
RAD51/6 MV	y = -210.47 x² + 1215.9 x + 529.91	0.9996	827^a	0.2 75^a	0.04 0^b	0.12 7^b
RAD51/18 MV	y = -307.62 x² + 1832.4 x + 847.15	0.9706	827^a	0.2 75^a	0.04 0^b	0.12 7^b

^aNon-significant differences between the copy numbers of genes at the same doses at 6 and 18 MV photon beam energies.

^bSignificant differences between the copy number of genes at the same doses at 6 and 18 MV photon beam energies (P < 0.05).