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Tislelizumab, an anti‐programmed death protein‐1 (PD‐1) monoclonal antibody, was engineered to minimize binding to the FcγR on macrophages to abrogate antibody‐dependent phagocytosis, a mechanism of T‐cell clearance and potential resistance to anti‐PD‐1 therapy. This single‐arm phase 2 trial (NCT04004221/CTR20170071) assessed the safety, tolerability, and efficacy of tislelizumab in patients with PD‐L1‐positive urothelial carcinoma who progressed during/following platinum‐containing therapy and had no prior PD‐(L)1 inhibitor treatment. Patients were considered PD‐L1 positive if ≥ 25% of tumor/immune cells expressed PD‐L1 when using the VENTANA™ PD‐L1 (SP263) assay. The primary endpoint was objective response rate by independent review committee. As of September 16, 2019, 113 patients had a median study follow‐up time of 9.4 mo. Most patients (76%) had visceral metastases, including 24% with liver and 23% with bone metastases. Among 104 efficacy‐evaluable patients, confirmed objective response rate was 24% (95% confidence interval, 16, 33), including 10 complete and 15 partial responses. Median duration of response was not reached. Among 25 responders, 17/25 (68%) had ongoing responses. Median progression‐free survival and overall survival times were 2.1 and 9.8 mo, respectively. The most common treatment‐related adverse events were anemia (27%) and pyrexia (19%). Anemia (7%) and hyponatremia (5%) were the only grade 3‐4 treatment‐related adverse events and occurred in ≥ 5% of patients. Three investigator‐assessed deaths were considered to be possibly related to study treatment (hepatic failure, n = 2; respiratory arrest, n = 1). Tislelizumab demonstrated meaningful clinical benefits in patients with previously treated locally advanced or metastatic PD‐L1‐positive urothelial carcinoma and had a manageable safety profile.

Tislelizumab in Asian patients with previously treated locally advanced or metastatic urothelial carcinoma