Cited by 72Monoclonal and Polyclonal Antibodies ResearchCancer Immunotherapy and BiomarkersNanoparticle-Based Drug Delivery

The DOI matches its Crossref record; 20 of the 20 references it cites were found in a registry or an index.

Phase I, First-in-Human Study of the Probody Therapeutic CX-2029 in Adults with Advanced Solid Tumor Malignancies

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Abstract

Purpose: PROCLAIM-CX-2029 is a phase I first-in-human study of CX-2029, a Probody–drug conjugate targeting CD71 (transferrin receptor 1) in adults with advanced solid tumors. Although the transferrin receptor is highly expressed across multiple tumor types, it has not been considered a target for antibody–drug conjugates (ADCs) due to its broad expression on normal cells. CX-2029 is a masked form of a proprietary anti-CD71 antibody conjugated to monomethyl auristatin E, designed to be unmasked in the tumor microenvironment by tumor-associated proteases, therefore limiting off-tumor toxicity and creating a therapeutic window for this previously undruggable target. Patients and Methods: This was a dose-escalation, multicenter trial to evaluate the safety, pharmacokinetics, pharmacodynamics, and antitumor activity of CX-2029. The primary endpoint was to determine the maximum tolerated dose (MTD) and cycle 1 dose-limiting toxicity (DLT). CX-2029 was administered i.v. every 3 weeks. Results: Forty-five patients were enrolled in eight dose levels. No DLTs were reported in the dose escalation through 4 mg/kg. At 5 mg/kg, there were two DLTs (febrile neutropenia and pancytopenia). Following expansion of the 4 mg/kg dose to six patients, two additional DLTs were observed (infusion-related reaction and neutropenia/anemia). Both the 4 and 5 mg/kg doses were declared above the maximum tolerated dose. The recommended phase II dose is 3 mg/kg. The most common dose-dependent hematologic toxicities were anemia and neutropenia. Confirmed partial responses were observed in three patients, all with squamous histologies. Conclusions: The Probody therapeutic platform enables targeting CD71, a previously undruggable ADC target, at tolerable doses associated with clinical activity. See related commentary by Oberoi and Garralda, p. 4459

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Research works printed but not linked: 2

  1. Singh, Developing a CD71-Targeting ProbodyTM Drug Conjugate (PDC) for Activity in Multiple Solid Tumor and Lymphoma Models and for Tolerability in Non-human Primates
  2. Stroh, 2020, A quantitative systems pharmacology model both captures nonclinical PK/PD and facilitates clinical translation of a masked, tumor-activated CD71 antibody drug conjugate, Clin Pharmacol Ther, 107, S48

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Metadata

Authors
Johnson, M., El-Khoueiry, A., Hafez, N., Lakhani, N., Mamdani, H., Rodon, J., Sanborn, R. E., Garcia-Corbacho, J., Boni, V., Stroh, M., Hannah, A. L., Wang, S., Castro, H., & Spira, A.
Affiliations
  • Sarah Cannon (US)
  • University of Southern California (US)
  • Yale Cancer Center (US)
  • South Texas Accelerated Research Therapeutics (US)
  • The Barbara Ann Karmanos Cancer Institute (US)
  • The University of Texas MD Anderson Cancer Center (US)
  • Providence Portland Medical Center (US)
  • 8Department of Medical Oncology (Hospital Clinic Barcelona)/Translational Genomics and Targeted Therapies in Solid Tumors (IDIBAPS), Barcelona, Spain.
  • Hospital Universitario HM Sanchinarro (ES)
  • CytomX Therapeutics (United States) (US)
  • Virginia Cancer Specialists (US)
Corresponding author
Johnson, Melissa
Venue
Clinical Cancer Research
Published
2021-06-03
Volume
27
Issue
16
Pages
4521-4530
ISSN
  • 1078-0432 (ISSN-L)
  • 1557-3265
OpenAlex
W3164185366
Cited by
72
References
20
Citations by year
2026: 18 · 2025: 7 · 2024: 16 · 2023: 14 · 2022: 15 · 2021: 2
FWCI
6.19
Type
journal article
Language
en
Open access
Locations
  • Clinical Cancer Research (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Monoclonal and Polyclonal Antibodies Research
  • Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
  • Physical Sciences › Materials Science › Biomaterials › Nanoparticle-Based Drug Delivery
Keywords
antibody-drug conjugates, transferrin receptor, transferrin receptor 1, monomethyl auristatin E, advanced solid tumors, maximum tolerated dose, dose-limiting toxicity, tumor-associated proteases, on-target off-tumor toxicity, hematologic toxicity, anticancer activity
MeSH terms
Adult, Aged, Female, Humans, Male, Middle Aged, Neoplasm Staging, Neoplasms, Prodrugs, Immunoconjugates, Antibodies, Monoclonal, Humanized

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