FBXW7 and head and neck squamous cell carcinoma: Collectively, these findings indicate that squamocin activates the UPS via UBA6 (E1), facilitating ubiquitin charging to UBE2Z (E2) and increasing the activities of FBXW7 (E3) to degrade both EZH2 and MYC, in an HSP90α‐dependent manner in HNSCC.