- Participants must meet the following molecular eligibility criteria (diagnosed at a central or local laboratory using either a tumor tissue based assay, which must indicate: at least one of following): a) fibroblast growth factor receptor (FGFR) gene translocations b) FGFR gene mutations c) Participants with evidence of FGFR pathway activation or other potential target/pathway inhibited by erdafitinib may also be considered and allowed for enrollment if supported by emerging biomarker data.