Adolescent 1 Adolescents and young adults 1 Alleles 1 Article 1 DNA purification 1 Early-onset oral cancer 1 Genetic Predisposition to Disease 1 Genetic polymorphism 1 Genotype 1 HLA antigen class 1 1 Histocompatibility Antigens Class I 1 Humans 1 Japan 1 Major histocompatibility complex class I-related chain A polymorphism 1 Mouth Neoplasms 1 NK Cell Lectin-Like Receptor Subfamily K Natural killer cells 1 Oral squamous cell carcinoma 1 Polymorphism, Genetic 1 Squamous Cell Carcinoma of Head and Neck 1 adolescent 1 adult 1 aged 1 allele 1 cancer prognosis 1 cancer risk 1 cancer survival 1 carcinogenesis 1 clinical feature 1 controlled study 1