CTNNB1 and cancer: Through comparative profiling of peptides presented in OPSCC tissue and healthy tonsils (HT), we found that many of the top class I and II TAP source proteins, such as CTNNB1, TP53, KDMB5, EGFR, and COL6A1, are closely linked to oncogenic pathways previously identified in HNSCC or other cancer entities (19, 20, 58–60).