XIAP and urinary bladder cancer: In addition to numerous studies expounding the mechanisms of anti‐apoptotic function of XIAP, a few studies have revealed that XIAP overexpression promotes colon cancer cell invasion via inhibiting Rho‐GDIα SUMOylation43 and facilitates bladder cancer invasion and lung metastasis via enhancing nucleolin‐mediated Rho‐GDIβ mRNA stability.4