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Sci Transl Med ; 9(372)2017 01 11.
Article in English | MEDLINE | ID: mdl-28077676

ABSTRACT

Disease relapse after treatment is common in triple-negative breast cancer (TNBC), ovarian cancer (OVCA), and non-small cell lung cancer (NSCLC). Therapies that target tumor-initiating cells (TICs) should improve patient survival by eliminating the cells that can drive tumor recurrence and metastasis. We demonstrate that protein tyrosine kinase 7 (PTK7), a highly conserved but catalytically inactive receptor tyrosine kinase in the Wnt signaling pathway, is enriched on TICs in low-passage TNBC, OVCA, and NSCLC patient-derived xenografts (PDXs). To deliver a potent anticancer drug to PTK7-expressing TICs, we generated a targeted antibody-drug conjugate (ADC) composed of a humanized anti-PTK7 monoclonal antibody, a cleavable valine-citrulline-based linker, and Aur0101, an auristatin microtubule inhibitor. The PTK7-targeted ADC induced sustained tumor regressions and outperformed standard-of-care chemotherapy. Moreover, the ADC specifically reduced the frequency of TICs, as determined by serial transplantation experiments. In addition to reducing the TIC frequency, the PTK7-targeted ADC may have additional antitumor mechanisms of action, including the inhibition of angiogenesis and the stimulation of immune cells. Together, these preclinical data demonstrate the potential for the PTK7-targeted ADC to improve the long-term survival of cancer patients.


Subject(s)
Antibodies/therapeutic use , Cell Adhesion Molecules/chemistry , Immunoconjugates/therapeutic use , Neoplastic Stem Cells/drug effects , Receptor Protein-Tyrosine Kinases/chemistry , Aminobenzoates/therapeutic use , Animals , Antineoplastic Agents/therapeutic use , Carcinoma, Non-Small-Cell Lung/immunology , Carcinoma, Non-Small-Cell Lung/therapy , Cell Adhesion Molecules/immunology , Cell Line, Tumor , Clinical Trials as Topic , Female , Humans , Immunotherapy/methods , Lung Neoplasms/immunology , Lung Neoplasms/therapy , Macaca fascicularis , Mice , Mice, Inbred NOD , Mice, SCID , Microtubules/chemistry , Neoplasm Recurrence, Local/drug therapy , Oligopeptides/therapeutic use , Ovarian Neoplasms/immunology , Ovarian Neoplasms/therapy , Receptor Protein-Tyrosine Kinases/immunology , Triple Negative Breast Neoplasms/immunology , Triple Negative Breast Neoplasms/therapy , Xenograft Model Antitumor Assays
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