Because the FOXQ1 gene is a protooncogene 25, 36, 37 that has not been studied in FGFR1-regulated cell growth, we aimed to investigate how FGFR1 signaling upregulates FOXQ1 expression and whether FOXQ1 is responsible for mediating breast cancer cell growth promoted by FGFR1 signaling. Here, FGFR1 is linked to breast cancer.