HSP90AA1 and cancer: Hsp90α is involved in growth promotion, cell cycle regulation, stress-induced cytoprotection, and cancer cell invasiveness; whereas Hsp90β is involved with early embryonic development, germ cell maturation, cytoskeletal stabilization, cellular transformation, signal transduction, and long-term cell adaptation (Eustace et al., 2004; Sreedhar et al., 2004).