TABLE 5

Cox Regression Analysis of Probability of Lesion Progression After ¹⁸F-FDOPA PET Imaging

	Univariate analysis			Multivariate analysis
Predictive factor	Hazard ratio	95% confidence interval	P	Hazard ratio	95% confidence interval	P
Age	1.02	0.99–1.05	0.31
Primary tumor vs. lung			0.976
Breast	1.04	0.49–2.34
Other	1.11	0.45–2.71
Prior stereotactic radiation treatment	0.53	0.26–1.09	0.08
Prior conventional radiation treatment	4.55	1.97–10.50	<0.01	3.46	1.27–9.44	0.015
Prior stereotactic and conventional radiation treatments	0.75	0.30–1.83	0.52
<6 mo from radiation treatment completion to PET	3.64	1.54–8.62	<0.01	1.02	0.36–2.90	0.97
≥12 mo from radiation treatment completion to PET	0.68	0.34–1.37	0.28
Steroid treatment during PET	1.32	0.64–2.73	0.50
Positive PET result (visual scale score of ≥2)	6.95	2.86–16.93	<0.01	6.24	2.51–15.47	<0.01