Multivariable analysis demonstrated that a high CONUT score (HR: 1.22; p < 0.001) and sarcopenia (HR: 2.23; p < 0.001), along with the following variables, were independently associated with poor OS: age (HR: 1.04; p = 0.002), presence of hydronephrosis (HR: 1.53; p = 0.016), UT primary tumor (HR: 1.69; p = 0.004), visceral metastasis (HR: 1.71; p = 0.004), high neutrophil count (HR: 1.01; p = 0.005), high ALP (HR: 1.02; p < 0.001), high LDH (HR: 1.01; p = 0.003), and high CRP (HR: 1.01; p = 0.033). Here, CRP is linked to sarcopenia.