Fibroblast Growth Factor Receptor Alteration Testing for >3600 Patients with Locally Advanced/Metastatic Urothelial Cancer and Non–muscle-invasive Bladder Cancer: An Analysis of the Global ANNAR Biomarker Study

This is the first and largest report on factors affecting FGFR test results. To ensure valid FGFR test results, adequate tumor sample amount, RNA quality, short archival sample age, and primary tumor samples are important factors.