Evaluation of the Effect of Tobacco Use on Buccal Mucosa Graft Histology.

ABSTRACT

OBJECTIVE: To assess the effect of tobacco use on oral mucosal tissue harvested for urethroplasty. MATERIALS AND METHODS: Retrospective histologic and immunohistochemical (IHC) evaluation of available buccal mucosa tissue samples from patients that underwent buccal mucosa graft urethroplasty from 2018 to 2020. Patients were asked about tobacco use during pre-operative workup. Patients were counseled on and provided resources to aid in cessation of tobacco use, but surgical cases were not canceled or delayed if patients are unable cease all tobacco use. Patients that ceased use 3 months prior to surgery were considered former users. A single pathologist blinded to the smoking status evaluated the buccal mucosa specimens for histologic changes. Quantitative IHC for p75 and Sox2 were obtained. These investigative markers were selected due to their clear and direct involvement in oral mucosa's regenerative mechanism. Current tobacco users, former users and control patients were compared using ANOVA and Chi-square analyses. RESULTS: Study cohort was 16 current users, 16 former users, 32 controls. Demographics did not differ across the groups. Blinded histologic analysis between all groups found no differences. Pair-wise statistical analysis found greater collagen density in the control group compared to current users (P = .01). No differences were found between former and current users or former users and controls. IHC analysis did not demonstrate any difference in the amount or localization of epithelial stem cell markers. CONCLUSION: Our study of buccal mucosa did not find clear or clinically significant histologic or IHC differences between patients with or without a history of tobacco use.