A DLL3-targeted antibody-drug conjugate eradicates high-grade pulmonary neuroendocrine tumor-initiating cells in vivo
Laura Saunders,Alexander J. Bankovich,Wade C. Anderson,Monette Aujay,Sheila Bheddah,KristenAnn Black,Desai Radhika Chetan,Paul Anthony Escarpe,Johannes Hampl,Amy Laysang,David R. Liu,Javier Lopez-Molina,Milly Milton,Albert Park,Marybeth A. Pysz,Hui Shao,Brian Slingerland,Torgov Michael,Samuel A. Williams,Orit Foord,Howard Philip Wilson,Jacek Jassem,Andrzej Badzio,Piotr Czapiewski,David H. Harpole,Afshin Dowlati,Pierre P. Massion,William D. Travis,M. Catherine Pietanza,M. Catherine Pietanza,John T. Poirier,John T. Poirier,Charles M. Rudin,Robert A. Stull,Scott J. Dylla +34 more
TLDR
The authors targeted DLL3 with an antibody conjugated to a cytotoxic drug, which proved to be much more effective than standard chemotherapy for treating patient-derived tumor xenografts and is a promising first-in-class ADC for the treatment of high-grade pulmonary neuroendocrine tumors.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.read more
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