Abstract
Enfortumab Vedotin (EV) is approved for metastatic urothelial carcinoma (mUC) progressing post-platinum and PD1/L1 inhibitor therapy. Erdafitinib is approved for post-platinum mUC with activating somatic genomic alterations (GAs) in FGFR2/3. Information on the activity of EV in mUC with FGFR2/3 alterations will facilitate optimal clinical management. In this multi-center, retrospective analysis, we assessed the overall survival (OS), progression-free survival (PFS) and objective response rate (ORR) to EV in mUC patients with and without FGFR2/3 GAs including mutations and fusions. Multivariable cox-regression and logistic regression analyses with 2-tailed p-values were used to evaluate the association of GAs with outcomes. A majority of the evaluable 60 patients were male (44/60, 78%), exhibited ECOG performance score 0-1 (53/60, 88.3%) and had a median age of 70.5 (range 48 - 88) years when starting EV. GAs in FGFR2/3 did not influence the ORR (p=0.32), OS (p=0.79) or PFS (p = 0.32) with EV. In conclusion, FGFR2/3 GAs did not appear to compromise major outcomes with EV in mUC. Larger studies are required to further evaluate the impact of FGFR2/3 GAs on the activity of EV and the optimal sequencing of EV and erdafitinib in mUC.
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