The tumour-retention property of Hsp90 inhibitors (Vilenchik et al., 2004; Banerji et al., 2005) has been explored as a means to image tumours (Barrott et al., 2013; Osada et al., 2022), as well as to deliver larger drug-containing conjugates to tumour cells (Proia et al., 2015; Heske et al., 2016). The gene discussed is HSP90AB1; the disease is neoplasm.