This form of cancer is often seen in those who chew tobacco or use snuff orally, so much so that it is sometimes referred to as "Snuff dipper's cancer". Chewing betel nuts is an additional risk factor commonly seen in Taiwan.
Verrucous carcinoma
Anaplastic carcinoma
Basal-like carcinoma
Mucinous carcinoma
Adenosarcoma
Lymphoepithelioma-like carcinoma
Mammoplasia
Epithelial-myoepithelial carcinoma