Table 1. The tumor and backgrounds uptake and Tumor-to-background ratios of ⁶⁴Cu-PCTA-cetuximab in SNU-1066 xenograft model.

	2 h			24 h			48 h
Tumor	3.9	±	1.3	8.4	±	1.0	12.8	±	1.7
Blood	30.8	±	4.7	13.3	±	1.0	11.7	±	1.9
Muscle	1.3	±	0.1	2.5	±	0.2	2.5	±	0.4
Tumor/Blood	0.1	±	0.02	0.6	±	0.1	1.1	±	0.1
Tumor/Muscle	2.9	±	0.7	3.3	±	0.5	5.2	±	0.9

Data represent mean ± S.D (n = 4).