Effect of 17-AAG on growth of HMC-1.1 and HMC-1.2 cells. HMC-1.1 cells (A) and HMC-1.2 cells (B) were grown in the presence of increasing concentrations of 17-AAG and data are shown as relative growth compared to control on day 0. Viability of the cells was determined by MTT assay as described in “Patients, materials, and methods.”