GB-6 is a short linear peptide that targets the gastrin releasing peptide receptor (GRPR). GRPR is overexpressed in pancreatic cancer. Based on the tumor selectivity and tumor-specific accumulation properties of GB-6, GB-6 labeled with near infrared (NIR) fluorescent dyes or radionuclide netium-99m (99mTc) can be used as a high-contrast imaging probe. GB-6 has excellent in vivo stability, with tumor to pancreatic and intestinal fluorescence signal ratios of 5.2 and 6.3, respectively, in SW199 0 subcutaneous xenograft models. GB-6 can rapidly target tumors and accurately delineate tumor boundaries, which has broad application prospects[1].
