Proportional Trends by Subsite
Out of the four HNC subsets, cancers of the oropharynx have proportionally increased, specifically in the middle-aged population from 1975 to 2016, while cancers of the larynx, oral cavity and hypopharynx have proportionally decreased in the same time-frame (Table 1). Additionally, regional data showed similar trends in all four subsites throughout each region (West, Northeast, Midwest, Southwest and Southeast). No significant deviations were noted in any region (Table 1).