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Background Muscle invasive bladder cancer (BC) has a mortality rate of 50% in 5 years, despite the aggressive treatments currently used. The diagnosis of latent tumor cells in histologically normal lymph nodes (LN) may have prognostic value and may explain the tumoral recurrence in BC. Methods Here we evaluated the use of the AE1AE3 cytokeratin marker through immunohistochemical examination of LNs...