Furthermore, the αvβ3 peptide inhibitor cyclo(─RGDfK), but not PSFL‐NK13, inhibited the FN‐induced increase in αvβ3 surface expression in cancer cells (FN vs FN + cyclo(─RGDfK), p = 0.0084; FN vs FN + PSFL‐NK13, p = 0.6191, one‐way ANOVA with Bonferroni post‐hoc test; Figure S17B, Supporting Information). This evidence concerns the gene FN1 and cancer.