High HSP90 expression levels have been correlated with poor prognosis in all subtypes of breast cancer patients (Pick et al, 2007; Dimas et al, 2018), several independent cohorts of non‐small cell lung cancer (NSCLC) patients (Gallegos Ruiz et al, 2008), and in colorectal cancer (Kim et al, 2019). Here, HSP90AA1 is linked to breast cancer.