Table 1. Selected studies using FDG-PET for detecting recurrence following SABR.

Study	Number of patients	Number of recurrences [proportion pathology proven %]	SUVmax cutoff	Sensitivity (%)	Specificity (%)	Definition of local recurrence if not biopsied
Essler, et al. (50)	29	6 [NR]	5.48	NR	NR	Increase in tumor volume of more than 25% on CT, accompanied by metabolic activity in FDG-PET
Bollineni, et al. (49)	132	6 [50]	5.0	NR	NR	Based on growth by more than 20% of the tumor diameter compared with the pretreatment
Zhang, et al. (47)	128	9 [78]	5.0	100	91	PET/CT
Takeda et al. (48)	154	17 [18]	3.2 (early)	100	96-98	Increase in the cross-sectional tumor size of >25% on successive CT scans at least three times over a 6-month period
			4.2 (late)

NR, not reported.