Participants were randomly assigned at each dose level (dose A, B, C). During a standard minimally invasive surgery, visualization of the surgical field was assessed following the placement of the near infrared fluorescence (NIR F) imaging system proximal to the ureter of interest and then ASP5354 was administered.~Based on Visualization Review Committee (VRC) review of the initial 3 dose levels, if none of the doses selected had visualization, then additional two dose levels (dose D and E) was planned to be added; if 1 dose selected has visualization, then the dose level D was planned to be added. The dose level F was planned to be added if only the dose E level has visualization.
The primary purpose of this study was to determine the optimal dose of ASP5354 for ureter visualization in participants undergoing laparoscopic/minimally invasive colorectal surgery This study also investigated the safety, tolerability and the pharmacokinetics of ASP5354 in participants undergoing laparoscopic/minimally invasive colorectal surgery.