HSP90AA1 and breast cancer: Table 2 compares the CellTiter‐Blue assay GI50 values (HEK‐293 and MDA‐MB‐231 human cell lines, 24 h incubation time) and colony formation data IC50 values (MCF‐7 breast cancer cells) with the Hsp90 ATPase activity IC50 values for each of the compounds.