HSP90B2P and neoplasm: Heat‐shock proteins (HSPs) are molecular chaperones, and bacterial HSPs have been shown to augment adaptive immune responses.14 In vaccine development HSPs are now being exploited to improve efficacy.15 For example, a novel vaccine strategy for Neisseria meningitidis uses a bacterial HSP in a protein antigen–HSP complex that enhances antigen immunogenicity.16 HSPs have also found application in cancer immunotherapy, where they are complexed with a tumour antigen, aiding the activation of anti‐tumour immune responses.17