Enfortumab Vedotin for Elderly Advanced Urothelial Carcinoma Patients or Those With a Poor Performance Status

Background/Aim: The efficacy, safety, and liver toxicity of enfortumab vedotin (EV) for elderly advanced urothelial carcinoma (UC) patients and patients with a poor performance status (PS) are unclear. Patients and Methods: We retrospectively analyzed the efficacy, safety, and liver toxicity of EV in elderly patients and patients with a poor PS between December 2021 and August 2023. Results: Sixty-two patients (≥75 years old, n=22; PS≥2, n=10) were enrolled. Patients with PS≥2 had significantly lower albumin levels than those with PS<2 (p=0.023). The objective response and disease control rates did not differ significantly between patients <75 and ≥75 years old (p=0.598 and p=0.769, respectively) or between those with PS<2 and PS≥2 (p>0.99 and p=0.178, respectively). Progression-free survival (PFS) and overall survival (OS) were not significantly different in patients <75 years and ≥75 years (p=0984, 0.368). A significant difference in PFS (p=0.047) but not OS (p=0.086) was observed between the PS<2 and PS≥2 groups. The rates of any-grade and severe (grade ≥3) adverse events did not differ significantly between patients <75 and ≥75 years (p=0.471, p=0.136) or between PS<2 and PS≥2 groups (p>0.99, 0.99). Aspartate aminotransferase (AST) levels significantly increased, but alanine aminotransferase levels did not, following EV treatment (p<0.001). Multivariate analyses revealed that the albumin level was an independent prognostic factor (hazard ratio=0.159; p<0.001). Conclusion: EV demonstrated similar efficacy and safety in elderly and younger patients with advanced UC. In patients with a poor PS, although the safety was similar, survival was significantly worse in terms of PFS, while the AST levels were significantly elevated.