Monoclonal antibody drug immunoconjugates for targeted treatment of cancer

Pamela A Trail1, H Dalton King, Gene M Dubowchik

  • 1pamela.trail.b@bayer.com

Insights

Monoclonal antibody immunoconjugates selectively deliver potent drugs to tumors, enhancing efficacy and reducing toxicity. This approach shows promise for cancer treatment, with some conjugates already in clinical trials and one approved for leukemia.

Area of Science:

  • Oncology
  • Immunology
  • Pharmacology

Background:

  • Monoclonal antibodies (mAbs) targeting tumor-associated antigens (TAAs) or tumor vasculature can be linked to potent drugs.
  • These mAb immunoconjugates aim to selectively deliver therapeutics to tumors, potentially improving antitumor efficacy and reducing systemic toxicity.

Purpose of the Study:

  • To review the properties of tumors, mAbs, linkers, and drugs that influence the efficacy, potency, and selectivity of immunoconjugates for cancer treatment.
  • To highlight the demonstrated feasibility and ongoing evaluation of immunoconjugates in clinical settings.

Main Methods:

  • Review of preclinical and clinical data on monoclonal antibody immunoconjugates.
  • Analysis of factors influencing immunoconjugate performance, including antibody internalization, linker stability, drug potency, and tumor-specific antigen expression.

Main Results:

  • Several immunoconjugates, especially those with internalizing antibodies and tumor-selective linkers, show significant activity in preclinical models.
  • Immunoconjugates delivering doxorubicin, maytansine, and calicheamicin are in clinical trials, with Gemtuzumab ozogamicin approved for AML.

Conclusions:

  • The use of immunoconjugates as cancer therapeutics is feasible and supported by clinical evidence.
  • Optimizing tumor characteristics, mAb properties, linker technology, and drug selection is crucial for developing effective immunoconjugate therapies.

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