In MEDLINE (PubMed), the reviewers used a combination of keywords, including "oral squamous cell carcinoma," "heat shock proteins," and "metastasis." In addition, they used MeSH terms such as "HSP90 heat-shock proteins" and "neoplasm metastasis." The search strategy also included Boolean operators such as "AND," "OR," and "NOT" to narrow down the search results. Here, HSP90AA1 is linked to neoplasm.