In subcutaneous xenograft mouse models of glioblastoma (GBM), lung cancer, and triple negative breast cancer (Figure 6), as established using U-87MG, A549, and MDA-MB-231 cells, respectively, intratumoral treatment with R-Tf-D-LP4, Tf-D-LP4, or D-ΔN-Ter-Antp peptides highly inhibited tumor growth (~70–90%) [5,7]. Here, TF is linked to glioblastoma.