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  • Review Article
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Molecular imaging supports the development of multispecific cancer antibodies

Abstract

Multispecific antibodies are engineered antibody derivatives that can bind to two or more distinct epitopes or antigens. Unlike mixtures of monospecific antibodies, the binding properties of multispecific antibodies enable two specific molecules to be physically linked, a characteristic with important applications in cancer therapy. The field of multispecific antibodies is highly dynamic and expanding rapidly; to date, 15 multispecific antibodies have been approved for clinical use, of which 11 were approved for oncological indications, and more than 100 new antibodies are currently in clinical development. Nevertheless, substantial challenges limit the applications of multispecific antibodies in cancer therapy, particularly inefficient targeting of solid tumours and substantial adverse effects. Both PET and single photon emission CT imaging can reveal the biodistribution and complex pharmacology of radiolabelled multispecific antibodies. This Review summarizes the insights obtained from preclinical and clinical molecular imaging studies of multispecific antibodies, focusing on their structural properties, such as molecular weight, shape, target specificity, affinity and avidity. The opportunities associated with use of molecular imaging studies to support the clinical development of multispecific antibody therapies are also highlighted.

Key points

  • The use of multispecific antibodies in cancer treatment is expanding rapidly: 11 agents have been approved to date and many others are undergoing clinical development.

  • The design of multispecific antibodies with optimal pharmacological properties has resulted in a wide variety of molecule formats.

  • PET and single photon emission CT imaging are powerful non-invasive tools for studying the biodistribution of radiolabelled antibodies, including their uptake in tumour and healthy tissues, pharmacokinetics and target expression.

  • Preclinical and clinical molecular imaging studies of multispecific antibodies underscore key structural properties that affect their biodistribution, including target affinity and avidity, molecular weight and structure.

  • Biological factors that also influence the biodistribution of multispecific antibodies include target expression in tumour tissues, off-tumour and immune target engagement, antibody internalization, tracer dose and target saturation.

  • Molecular imaging can aid the development of multispecific antibodies by facilitating their selection and design for clinical applications and by identifying biomarkers for the stratification of patient groups.

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Fig. 1: Timeline of multispecific antibody approvals.
Fig. 2: Formats of multispecific antibodies in clinical development.
Fig. 3: Drug development stages and opportunities for using molecular imaging to support this process.

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C.A.J.v.W and F.R.P. researched data for the article, wrote the manuscript and contributed substantially to discussions of its content and to review or editing of the article before submission. M.N.L.-d.H., D.J.A.d.G and E.G.E.d.V. also contributed substantially to discussions of the manuscript content and to review or editing of the manuscript before submission. A.H.B. contributed to review and/or editing of the manuscript before submission.

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Correspondence to Marjolijn N. Lub-de Hooge.

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Competing interests

D.J.A.d.G. declares that he received institutional financial support for clinical trials or contracted research from Amgen, Bayer, GE Healthcare, Hoffmann La Roche and Siemens. E.G.E.d.V. declares that she received institutional financial support for acting as a member of advisory boards or consultancy services from Crescendo Biologics, Daiichi Sankyo and NSABP, as well as institutional financial support for clinical trials or contracted research grants from Amgen, Bayer, Crescendo Biologics, Genentech, Regeneron, Roche and Servier. M.N.L.-d.H. declares that she received institutional financial support for acting as a member of advisory boards or consultancy services from Merck and institutional financial support for conducting clinical and preclinical studies from Amgen, Bayer and Servier. The other authors declare no competing interests.

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Nature Reviews Clinical Oncology thanks Weijun Wei and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.

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Primary research articles published in English from 1 January 2014 to 18 March 2024 were identified using PubMed. Search terms included the names of known multispecific antibody constructs, solid tumours and PET or SPECT radioligands. In addition, the ClinicalTrials.gov database was searched for trials of multispecific antibodies up to September 2023 and abstracts from the American Association for Cancer Research and the American Society of Clinical Oncology annual meetings from 2023 were also reviewed to identify further relevant articles. Full details of the literature search strategy are provided in the Supplementary information.

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van Winkel, C.A.J., Pierik, F.R., Brouwers, A.H. et al. Molecular imaging supports the development of multispecific cancer antibodies. Nat Rev Clin Oncol 21, 852–866 (2024). https://doi.org/10.1038/s41571-024-00946-3

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