Despite the various studies involving CSC markers such as ALDH1 and Notch1 in OSCC, the immunoexpression levels of these biomarkers specifically in subtypes of oral cancer with distinct clinical and prognostic behaviors such as verrucous carcinoma and basaloid squamous cell carcinoma are scarce in the scientific literature. Here, ALDH1A1 is linked to basaloid squamous cell carcinoma.