Clinical Research Directory

* Aged 18 or older, with a diagnosis of oral premalignant or malignant tumors (eligible diagnoses listed below) or presenting with suspected premalignant or malignant tumors for definitive diagnosis * Must be able to provide informed consent * Oral premalignant or malignant tumors presenting for evaluation for the first time at UT MD Anderson Cancer Center * Oral premalignant or malignant tumors who were previously treated or evaluated at UT MD Anderson Cancer Center who presents for evaluation of progressive or recurrent disease. Newly collected biospecimens and tissue samples will be linked to applicable samples previously collected and banked/stored under PA17-0050, LAB02-427, Lab02-039 and Lab08-0848. Eligible diagnoses include: * Leukoplakia * Erythroplakia * Mild dysplasia * Moderate dysplasia * Severe dysplasia * Carcinoma in situ * Squamous cell carcinoma Exclusion: \- Pregnant women and/or cognitively-impaired adults are excluded from this study. Exclusion Criteria: \- Prior oral squamous cell carcinoma (OSCC) surgery or OSCC radiation treatment at a non-MDA institution.