Fig. 1 Concept of study and identification of DRL for cancer cell–based self-targeting therapies. Concept of study and identification of DRL for cancer.

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Fig. 1 Concept of study and identification of DRL for cancer cell–based self-targeting therapies. Concept of study and identification of DRL for cancer cell–based self-targeting therapies. (A) Allogeneic approach: Cancer cells resistant to receptor-targeted therapies can be used off-the-shelf for delivery of receptor ligands toward allogeneic cancers with ligand-sensitive phenotypes in the setting of primary treatment. Because they are co-engineered with a prodrug-activatable suicide system [herpes simplex virus thymidine kinase (HSV-TK)], therapeutic cancer cells can be eliminated after therapy using ganciclovir (GCV). (B) Autologous approach: Cancer cells harvested from patients during initial surgery and identified as sensitive to receptor-targeted therapies can be CRISPR-engineered to knock out the target receptors. Receptor knockout (KO) results in therapy resistance and allows engineering with receptor ligands and delivery toward autologous self-tumor sites in the setting of recurrence. (C) A panel of primary and metastatic cancer cell lines was treated with conditioned medium containing secretable variants of different receptor-targeted molecules, and viability was assessed 72 hours after treatment (n = 3 technical replicates). TSP, thrombospondin-1; Nb, nanobody. (D) Cancer cell lines were tested with varying concentrations of TRAIL to quantify TRAIL sensitivity (n = 3 technical replicates). TRAIL-sensitive (s) or -resistant (r), nodular (n) and invasive (i) glioblastoma (GBM), colon cancer (CC), T cell leukemia (TCL), metastatic breast cancer (BCm), and metastatic prostate cancer cells (PCm) were tested. All in vitro experiments were repeated at least twice. Means ± SD are shown. P values by unpaired t test. **P < 0.01, ***P < 0.001. Clemens Reinshagen et al., Sci Transl Med 2018;10:eaao3240 Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works