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Sci Transl Med. 2015 Aug 26;7(302):302ra136. doi: 10.1126/scitranslmed.aac9459.

A DLL3-targeted antibody-drug conjugate eradicates high-grade pulmonary neuroendocrine tumor-initiating cells in vivo.

Author information

1
Stemcentrx Inc., South San Francisco, CA 94080, USA.
2
Spirogen (a member of the AstraZeneca Group), London W2 6BD, UK.
3
Medical University of Gdańsk, Gdańsk 82-300, Poland.
4
Duke University Medical Cancer, Durham, NC 27710, USA.
5
Case Western Reserve University and University Hospitals Seidman Cancer Center, Cleveland, OH 44106, USA.
6
Thoracic Program, Vanderbilt-Ingram Cancer Center, Tennessee Valley Healthcare Systems, Nashville Campus, Nashville, TN 37232, USA.
7
Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA.
8
Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA. Weill Cornell Medical College, New York, NY 10065, USA.
9
Stemcentrx Inc., South San Francisco, CA 94080, USA. scott.dylla@stemcentrx.com.

Abstract

The high-grade pulmonary neuroendocrine tumors, small cell lung cancer (SCLC) and large cell neuroendocrine carcinoma (LCNEC), remain among the most deadly malignancies. Therapies that effectively target and kill tumor-initiating cells (TICs) in these cancers should translate to improved patient survival. Patient-derived xenograft (PDX) tumors serve as excellent models to study tumor biology and characterize TICs. Increased expression of delta-like 3 (DLL3) was discovered in SCLC and LCNEC PDX tumors and confirmed in primary SCLC and LCNEC tumors. DLL3 protein is expressed on the surface of tumor cells but not in normal adult tissues. A DLL3-targeted antibody-drug conjugate (ADC), SC16LD6.5, comprised of a humanized anti-DLL3 monoclonal antibody conjugated to a DNA-damaging pyrrolobenzodiazepine (PBD) dimer toxin, induced durable tumor regression in vivo across multiple PDX models. Serial transplantation experiments executed with limiting dilutions of cells provided functional evidence confirming that the lack of tumor recurrence after SC16LD6.5 exposure resulted from effective targeting of DLL3-expressing TICs. In vivo efficacy correlated with DLL3 expression, and responses were observed in PDX models initiated from patients with both limited and extensive-stage disease and were independent of their sensitivity to standard-of-care chemotherapy regimens. SC16LD6.5 effectively targets and eradicates DLL3-expressing TICs in SCLC and LCNEC PDX tumors and is a promising first-in-class ADC for the treatment of high-grade pulmonary neuroendocrine tumors.

Comment in

PMID:
26311731
PMCID:
PMC4934375
DOI:
10.1126/scitranslmed.aac9459
[Indexed for MEDLINE]
Free PMC Article

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