%0 Journal Article %T Evaluation of antibody fragment properties for near-infrared fluorescence imaging of HER3-positive cancer xenografts %A Ayman El-Sayed %A C. Ronald Geyer %A Carolina Gonzalez %A Humphrey Fonge %A Kris Barreto %A Landon Pastushok %A Wayne Hill %A Wendy Bernhard %J Theranostics %D 2018 %I Ivyspring International Publisher %R 10.7150/thno.24252 %X In vivo imaging is influenced by the half-life, tissue penetration, biodistribution, and affinity of the imaging probe. Immunoglobulin G (IgG) is composed of discrete domains with known functions, providing a template for engineering antibody fragments with desired imaging properties. Here, we engineered antibody-based imaging probes, consisting of different combinations of antibody domains, labeled them with the near-infrared fluorescent dye IRDye800CW, and evaluated their in vivo imaging properties. Antibody-based imaging probes were based on an anti-HER3 antigen binding fragment (Fab) isolated using phage display. %K antibody fragments %K near-infrared fluorescence imaging %K HER3 %K ErbB3 %K IRDye800CW %U http://www.thno.org/v08p4856.htm