Clinical Evaluation of Bioadhesive Gels for Oral Cancer Chemoprevention

Forty one (41) patients with microscopically confirmed premalignant oral epithelial disease (epithelial dysplasia) will be enrolled in this trial at three clinical centers, i.e. the Ohio State University, University of North Carolina at Chapel Hill and University of Louisville. At all three institutions, half of the participants will randomly be assigned to the 10% FBR gel (0.5 gm four times daily for 3 months), while half will enter the placebo control arm. In accordance with the established standard of care, all participants need to have biopsies taken of their suspicious oral lesions to establish the diagnosis (non research). Trial participants will have three total biopsies. Pretreatment biopsies will entail: 1) perilesional tissue and single saliva sample for FBR metabolic profiling studies (tissue and saliva will be obtained 15 minutes after a single 0.5 gm application of 10% FBR gel for metabolic profiling. Gel application and nonlesional biopsy will be obtained before incisional biopsy of lesional tissue), and 2) a hemisection of lesional tissue to establish a diagnosis and provide a pretreatment baseline for the experimental parameters. While the pretreatment biopsy includes removal of both perilesional and lesional tissue, there will only be one surgical wound as the perilesional tissue is contiguous with the lesional tissue. A final excisional biopsy of the treatment site including any remaining residual lesional tissue (excision of oral dysplastic lesions is consistent with current standards of care) will be obtained after 3 months of treatment. The experimental design permits each patient to serve as their own internal control. Briefly, these following parameters will be monitored in all participants (comparisons made relative to patient-matched pretreatment to posttreatment biopsies): 1) light microscopic diagnoses, 2) clinical appearances and lesional sizes, 3) microarray gene expression analyses, 4) microvascular densities of superficial connective tissues, 5) LOH indices at loci associated with tumor suppressor genes, 6) intraepithelial levels of COX-2 and iNOS protein (image analysis quantified immunohistochemistry), 7) comparison of FBR metabolic profiles relative to extent of chemopreventive efficacy noted.