The 4 IHC markers defining the BASQ subtype of MIBC, CK14-positive, CK5/6-positive, GATA3-negative, FOXA1-negative expression [18] were not readily applicable to non-muscle-invasive papillary UTUC because positivity for CK14 and negativity for GATA3 or for FOXA1 was rarely observed in this tumor. The gene discussed is KRT5; the disease is renal pelvis/ureter urothelial carcinoma.