Cited by 120Cancer Immunotherapy and BiomarkersMonoclonal and Polyclonal Antibodies ResearchSarcoma Diagnosis and Treatment

The B7-H3–Targeting Antibody–Drug Conjugate m276-SL-PBD Is Potently Effective Against Pediatric Cancer Preclinical Solid Tumor Models

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Kendsersky, Nathan M., Lindsay, Jarrett, Kolb, E. Anders, Smith, Malcolm A., Teicher, Beverly A., Erickson, Stephen W., Earley, Eric J., Mosse, Yael P. +15 more·2021·Clinical Cancer Research

Published version of a preprint

Abstract

Purpose: Patients with relapsed pediatric solid malignancies have few therapeutic options, and many of these patients die of their disease. B7-H3 is an immune checkpoint protein encoded by the CD276 gene that is overexpressed in many pediatric cancers. Here, we investigate the activity of the B7-H3–targeting antibody–drug conjugate (ADC) m276-SL-PBD in pediatric solid malignancy patient-derived (PDX) and cell line–derived xenograft (CDX) models. Experimental Design: B7-H3 expression was quantified by RNA sequencing and by IHC on pediatric PDX microarrays. We tested the safety and efficacy of m276-SL-PBD in two stages. Randomized trials of m276-SL-PBD of 0.5 mg/kg on days 1, 8, and 15 compared with vehicle were performed in PDX or CDX models of Ewing sarcoma (N = 3), rhabdomyosarcoma (N = 4), Wilms tumors (N = 2), osteosarcoma (N = 5), and neuroblastoma (N = 12). We then performed a single mouse trial in 47 PDX or CDX models using a single 0.5 m/kg dose of m276-SL-PBD. Results: The vast majority of PDX and CDX samples studied showed intense membranous B7-H3 expression (median H-score 177, SD 52). In the randomized trials, m276-SL-PBD showed a 92.3% response rate, with 61.5% of models showing a maintained complete response (MCR). These data were confirmed in the single mouse trial with an overall response rate of 91.5% and MCR rate of 64.4%. Treatment-related mortality rate was 5.5% with late weight loss observed in a subset of models dosed once a week for 3 weeks. Conclusions: m276-SL-PBD has significant antitumor activity across a broad panel of pediatric solid tumor PDX models.

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  • Preclinical data evaluating antibody-drug conjugates targeting B7H3, LRRC15 and HER2 in osteosarcoma have been particularly promising and are rapidly moving to and through clinical trials.

    “Preclinical data evaluating antibody-drug conjugates, such as those targeting B7H3 (ref.90 ), LRRC15 (ref.86 ) and HER2 (ref.91 ), have been particularly promising and are rapidly moving to and through clinical trials.”

    From Osteosarcoma (2022) · cites this paper as [90]

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Authors
Kendsersky, N. M., Lindsay, J., Kolb, E. A., Smith, M. A., Teicher, B. A., Erickson, S. W., Earley, E. J., Mosse, Y. P., Martinez, D., Pogoriler, J., Krytska, K., Patel, K., Groff, D., Tsang, M., Ghilu, S., Wang, Y., Seaman, S., Feng, Y., Croix, B. S., Gorlick, R., Kurmasheva, R., Houghton, P. J., & Maris, J. M.
Affiliations
  • Children's Hospital of Philadelphia (US)
  • Alfred I. duPont Hospital for Children (US)
  • National Cancer Institute (US)
  • RTI International (US)
  • 1Division of Oncology and Center for Childhood Cancer Research, Children's Hospital of Philadelphia, Pennsylvania.
  • 6Division of Anatomic Pathology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.
  • The University of Texas at San Antonio Health Science Center (US)
  • The University of Texas MD Anderson Cancer Center (US)
Corresponding author
  • Houghton, Peter J.
  • Maris, John M.
Venue
Clinical Cancer Research
Published
2021-02-22
Volume
27
Issue
10
Pages
2938-2946
ISSN
  • 1078-0432 (ISSN-L)
  • 1557-3265
OpenAlex
W3129393016
Cited by
120
References
49
Citations by year
2026: 15 · 2025: 27 · 2024: 18 · 2023: 22 · 2022: 19 · 2021: 19
FWCI
7.10
Type
journal article
Language
en
Open access
Licence
other-oa
Locations
  • Clinical Cancer Research (publishedVersion, other-oa)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • NCI (U01 CA199287, R35 CA220500, U01 CA199221, NCI U01 CA199297, F31CA239424)
  • Giulio D'Angio Endowed Chair
Topics
  • Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Monoclonal and Polyclonal Antibodies Research
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Sarcoma Diagnosis and Treatment
Keywords
B7-H3, antibody-drug conjugates, pediatric solid tumors, Ewing sarcoma, rhabdomyosarcoma, Wilms tumor, osteosarcoma, neuroblastoma, patient-derived xenografts, cell line-derived xenografts, immune checkpoint, anticancer activity, non-relapse mortality
MeSH terms
Animals, Child, Disease Models, Animal, Female, Humans, Neoplasms, Pediatrics, Treatment Outcome, Immunoconjugates, Xenograft Model Antitumor Assays, Cell Line, Tumor, Mice, B7 Antigens

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