Oral cancers are part of a group of cancers commonly referred to as head and neck cancers, and of all head and neck cancers they comprise about 85% of that category. Brain cancer is a cancer category unto itself, and is not included in the head and neck cancer group.
Historically the death rate associated with this cancer is particularly high not because it is hard to discover or diagnose, but due to the cancer being routinely discovered late in its development.
Today, (2016) that statement is still true, as there is not a comprehensive program in the US to opportunistically screen for the disease, and without that; late stage discovery is more common. Another obstacle to early discovery (and resulting better outcomes) is the advent of a virus, HPV16, contributing more to the incidence rate of oral cancers, particularly in the posterior part of the mouth (the oropharynx, the tonsils, the base of tongue areas) which many times does not produce visible lesions or discolorations that have historically been the early warning signs of the disease process.
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