EGFR- and VEGF(R)-Targeted Small Molecules Show Synergistic Activity in Colorectal Cancer Models Refractory to Combinations of Monoclonal Antibodies

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Abstract
Purpose: Epidermal growth factor receptor (EGFR) and VEGF(R) signaling show extensive cross-talk, providing a rationale for joint targeting of the two pathways. However, combinations of monoclonal antibodies (mAb) targeting EGFR and VEGF showed disappointing activity in patients with colorectal cancer (CRC). We speculated that inhibition of surface receptors and ligands might only partly prevent oncogenic signaling whereas small-molecule tyrosine kinase inhibitors (TKI) would also influence intracellular signaling.

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