In this 5 year academic-industrial partnership to FDA approval, an experienced team and partners including Cornell, Vanderbilt, Intuitive Surgical, LI-COR, and Sand Hill Institute, will move a prostate-targeted fluorescent contrast agent, demonstrated in animals in a prior project to allow real-time detection of residual tumor, through FDA approval to human use. The unmet need is that because prostate tumor at the surgical margin is undetectable in real time, residual tumor at the margin occurs in 30% of all prostatectomies. Such patients have a significantly higher risk of local recurrence, metastasis, and death, and also require radiation therapy. In contrast, even patients with extra-prostatic extension of tumors do better when the margins are made clean of tumor during surgery.