The pretreatment relationship of tumor burden to speech and swallowing func
tion in 230 patients with oral or oropharyngeal cancer before surgery was a
ssessed. Reduced articulation, reduced conversational understandability, or
self-reported dysphagia were present in at least 34% of patients before tr
eatment. Videofluoroscopy showed at least 9% of patients had reduced swallo
wing efficiency on liquid, paste, or cookie boluses. By use of regression t
echniques, the percentages of the oral tongue and of the anterior floor of
mouth affected by neoplasm were found to be significantly related to reduce
d articulation; T stage and the percentage of the oral tongue affected with
tumor were mildly related to reduced understandability; tumor volume and h
aving soft palate affected by neoplasm were significantly related to self-r
eported dysphagia; and percentages of effected oral tongue and of affected
tongue base were significantly related to reduced swallowing efficiency. Tu
mor burden may contribute to functional deficits at diagnosis in patients w
ho have resectable tumors.