When comparing candidate genes between AYAs and all age groups for the same cancer type, we identified different candidate genes in prostate cancer (AYA01) and a germ cell tumor (AYA07), although several common candidate genes (TP53, FAT1,and NOTCH1) were found in HNSCC (AYA04) in both AYAs and all age groups (Table 2). This evidence concerns the gene NOTCH1 and head and neck squamous cell carcinoma.