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. Author manuscript; available in PMC: 2010 Mar 15.
Published in final edited form as: Cancer Res. 2009 Mar 10;69(6):2435–2442. doi: 10.1158/0008-5472.CAN-08-2495

Table 1.

Summary of U87MG cell binding data for unlabeled, Cy5.5-labeled, and DOTA-conjugated peptides, reported as IC50 values.

Ligand unlabeled Cy5.5 DOTA
Echistatin 4.9 ± 1.0 nM n/a n/a
c(RGDyK) 860 ± 400 nM 150 ± 10 nM 380 ± 190
FN-RGD2 370 ± 150 nM 44 ± 17 nM 590 ± 210
2.5D 19 ± 6 nM 4.8 ± 1.1 nM 8.9 ± 2.9
2.5F 26 ± 5 nM 3.5 ± 0.8 nM 25 ± 8 nM
FN-RDG2 (---) (---) (---)

(n/a) not applicable, (---) no competition observed.