The same IHC criteria were marginally correlated with the progression-free survival (PFS) of the patients with non-muscle-invasive papillary high-grade UTUC (p = 0.071) retrieved from the published cohort [20]: tumors with CK5/6-low/CK20-high expression tend to show the worst PFS (Figure S2). Here, KRT20 is linked to renal pelvis/ureter urothelial carcinoma.