In this exploratory analysis of tissue samples from the pivotal, prospective, randomized phase III AGO-OVAR 11/ICON-7 trial (NCT00483782), we investigate the prognostic and predictive potential of FGFR/FGF expression (FGFR1, FGFR2, FGFR3, and FGFR4 or their ligands, FGF1 and FGF19)....expression of FGFR4 and FGF19 was linked to more favorable outcomes.