First-Line Immune Checkpoint Inhibitors in Older Patients with Advanced Urothelial Carcinoma: A Systematic Review and Meta-Analysis.

Urothelial carcinoma predominantly affects older patients, who often exhibit frailty, comorbidities, renal impairment, and reduced physiological reserve. We evaluated overall survival (OS) and progression-free survival (PFS) with first-line immune-based strategies in patients aged ≥65 years with advanced or metastatic urothelial carcinoma. The aim was to characterize treatment effects within this age-defined subgroup, not to determine whether age modifies treatment efficacy compared with younger patients. Methods: We conducted a systematic review and meta-analysis of phase 3 randomized trials published from January 2015 to May 2026 reporting age-specific survival outcomes. Combination regimens were compared with platinum-based chemotherapy using random-effects models. Results: Combination strategies improved OS versus chemotherapy (HR 0.79, 95% CI 0.64-0.96), although heterogeneity was substantial (I2 = 69.7%) and the prediction interval crossed the null (0.48-1.27). Class-specific HRs were 0.56 (95% CI 0.26-1.20) for ADC plus ICI, 0.85 (0.77-0.95) for ICI plus chemotherapy, and 0.91 (0.34-2.42) for dual-checkpoint inhibition. PFS favoured experimental treatment but remained imprecise (HR 0.54, 95% CI 0.27-1.08; I2 = 89.5%). Excluding ADC plus ICI trials attenuated the OS effect (HR 0.88, 95% CI 0.80-0.96), indicating that the pooled estimate was influenced by these trials. ICI monotherapy did not improve OS. Conclusions: First-line immune-based combinations improved survival in selected patients aged ≥65 years, but benefit varied across treatment classes and should not be considered uniform across regimens. These findings do not establish whether age modifies treatment efficacy. Age-specific safety data were insufficient to define the benefit-risk profile of individual strategies.