LaRiviere W, Pickett A B
J Am Dent Assoc. 1979 Dec;99(6):972-7. doi: 10.14219/jada.archive.1979.0424.
Squamous cell carcinoma of the lower lip may be unsuspected and undiagnosed in its early clinical stages and may appear in occult and noncharacteristic forms. Specific risk factors and characteristics of lesions were sought after clinical and histologic data were correlated in a survey of patients with precancerous and cancerous lesions of the lower lip.
