In accordance with US Food and Drug Administration recommendations, tumor PD-L1 expression should be assessed in all patients with platinum-ineligible metastatic urothelial carcinoma (mUC), and patients with low PD-L1 expression should not receive single-agent immune checkpoint inhibition treatment. By contrast, PD-L1 should not be tested in metastatic renal cell carcinoma and platinum-refractory mUC.
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