A Dye for the Detection of Cancer of the Tongue and Mouth

For PARRi-FL, imaging patients will first gargle a solution of PARRi-FL for 1 min, then spit out this solution and gargle with a cleaning solution (the solvent used for PARRi-FL) for 1 min. Then fluorescence imaging of the oral cavity and pharynx will be performed with an endoscope. The intensity and extent of the fluorescence signal will be recorded by one of the investigators for the tumor and adjacent normal mucosa.