The comparative analysis between MSP from washout cells and corresponding primary and/or recurrence tumor sample was done for RARB and RASSF1A genes, including 23 urinary bladder washings and 39 paraffin-embedded UC samples from 20 patients (median age of 68.65, ranging from 42 to 84 years) (Figure 2). Here, RASSF1 is linked to neoplasm.