HSP90AA1 and breast cancer: Likewise, plasma Hsp90α concentrations were at significantly higher levels in patients with breast cancer (median 66.50 ng/mL, mean 81.87 ng/mL) than those in the non-cancer group (median 38.44 ng/mL, mean 43.32 ng/mL), and the values were positively correlated with cancer malignancy (Figure 1D and Supplementary Table S5).