Oral cancer is cancer of the mouth that affects the tissues in the throat, gums, lips ... Some types, such as verrucous carcinoma, progress more slowly, making it harder to detect earlier signs.

This view was challenged in 1987 when Beljaards, van Dijk, and Hausman reported two cases of PKMB, both of which progressed to verrucous carcinoma with subsequent development of frank squamous ...