HSP90AA1 and neoplasm: For EBSCOhost (Dentistry & Oral Sciences Source), the search strategy was developed using a combination of keywords and MeSH terms, including "oral squamous cell carcinoma," "HSP90 heat-shock proteins," and "prognosis." In Embase, the search strategy included a combination of keywords such as "oral cancer," "heat shock proteins," and "lymph node metastasis." MeSH terms such as "HSP90 heat-shock proteins" and "neoplasm metastasis" were also used.