Table 2.

Tumor-to-background ratios at different time points after injection of ⁴⁴Sc/⁶⁸Ga-labeled DOTA-RGD and NODAGA-RGD

	44Sc-DOTA-RGD			68Ga-DOTA-RGD
U87MG	30 min p.i.	2 h p.i.	5 h p.i.	30 min p.i.	2 h p.i.
Tumor-to-blood	4.82 ± 1.60	40.1 ± 15.6	47.2 ± 18.0	4.34 ± 0.57	28.0 ± 4.26
Tumor-to-liver	0.99 ± 0.14	0.61 ± 0.04	2.90 ± 0.38	0.55 ± 0.09	0.48 ± 0.07
Tumor-to-kidney	1.16 ± 0.29	1.77 ± 0.13	1.82 ± 0.21	0.88 ± 0.07	1.74 ± 0.19
	44Sc-NODAGA-RGD			68Ga-NODAGA-RGD
U87MG	30 min p.i.	2 h p.i.	5 h p.i.	30 min p.i.	2 h p.i.
Tumor-to-blood	4.73 ± 1.24	34.1 ± 7.62	30.5 ± 9.93	4.17 ± 0.47	114 ± 35.0
Tumor-to-liver	3.02 ± 0.40	3.01 ± 0.13	2.82 ± 0.21	1.72 ± 0.16	1.50 ± 0.20
Tumor-to-kidney	1.18 ± 0.28	2.68 ± 0.14	2.58 ± 0.24	0.89 ± 0.03	1.49 ± 0.21