TABLE 3

Paired Comparisons of Probe Sensitivity and Specificity for Imaging HSV1-tk Expression

Xenograft measure*	2 h/2 h			24 h/2 h
Xenograft measure*		FIAU/ FHBG^†	FIAU/ FHPG^†	FIAU/ FHBG^‡	FIAU/ FHPG^‡
RG2TK+	21 ± 10	59 ± 18	21	66
RG2	9.9 ± 3.3	9.8 ± 5.4	2.0	1.4

↵* Concentration ratio.
↵^† Paired comparison from same animal tissue sampling dataset.
↵^‡ Ratio of mean values.