ALDH1A3 and head and neck cancer: An established cancer stemness marker was used in the present study, namely Aldehyde Dehydrogenase 1 Family Member A3 (ALDH1A3) since this Aldehyde Dehydrogenase isoenzyme has also recently been identified to be enriched in drug-tolerant persister cancer cells, cisplatin resistance, and radioresistance of head and neck cancer [33,34,35].