FGF ligands or FGFR-directed antibodies have beenconjugated to highly toxic drugs to specifically kill cancer cellsoverexpressing FGFRs.14,15 Among the ligands of the FGFfamily, FGF1 can bind to all four types of FGFRs, as well as heparansulfate proteoglycans (HPSGs) and heparin,12,16,17 which indicates that FGF1 could be a potentialvector for targeted drug delivery for several cancer types. Here, FGF1 is linked to cancer.