Oncologic Outcomes of Patients with Immune Checkpoint Inhibitor Resistant Urothelial Carcinoma Treated with Enfortumab Vedotin and the Impact of Neutrophil-to-Lymphocyte Ratio and Dysgeusia on Overall Survival: A Retrospective Multicenter Cohort Study in Japan

Simple Summary: Patients with locally advanced or metastatic urothelial carcinoma have a poor prognosis. Enfortumab vedotin, administered after cisplatin-based chemotherapy and followed by immune checkpoint inhibitors, is widely known to prolong overall survival (OS). However, the predictive factors of enfortumab vedotin treatment that prolong OS remain unclear. In this study, patients who received enfortumab vedotin with shrinking tumors showed a significant increase in OS compared to those who received chemotherapy other than enfortumab vedotin or those who did not receive any treatment. Multivariate analysis identified neutrophil-to-lymphocyte ratio and dysgeusia as potential predictors of OS. Patients without these factors had a significantly prolonged OS compared to those with both factors. In real-world practice, enfortumab vedotin therapy is effective for patients with locally advanced or metastatic urothelial carcinoma. Randomized phase III trial results have demonstrated enfortumab vedotin (EV), an antibody–drug conjugate (ADC) consisting of an anti-Nectin-4 human IgG1 monoclonal antibody and monomethyl auristatin E, is a useful treatment for patients with locally advanced or metastatic urothelial carcinoma (la/mUC) that progressed after immune checkpoint inhibitor (ICI) therapies. This multicenter retrospective cohort study aimed to identify predictive factors for the efficacy of EV therapy and prolonged overall survival (OS) of patients in clinical practice. This study included patients with la/mUC who received ICI treatment. Patients who subsequently received EV treatment, those who received non-EV chemotherapy, and those who received no treatment were defined as EV, non-EV, and best supportive care (BSC) groups, respectively. The median OS was 20, 15, and 7 months in the EV, non-EV, and BSC groups, respectively (p < 0.001). Patients with la/mUC who had a complete or partial response after EV treatment had a significantly prolonged OS compared with those with stable or progressive disease. Univariate analysis showed age, neutrophil-to-lymphocyte ratio (NLR), dysgeusia, and rash as independent predictors of OS improvement. NLR and dysgeusia were independent predictors of OS after EV in multivariate analysis. Patients without these factors had a significantly prolonged OS compared to those with both factors. In real-world practice, EV therapy is an effective treatment for patients with la/mUC after ICI treatment. [ABSTRACT FROM AUTHOR]