Combination of PU‐H71 and bortezomib exhibits greater inhibition of tumor growth in A673 xenograft model in NSG mice. A, Imaging at week 5 and the size of the tumors after excision are shown in all 4 groups of mice. B, Weight of the tumors, C, Total flux of the tumors imaged weekly, and D, metastatic burden (mean ± SEM of total flux of organs) in the four treatment groups is shown.