Cancer Immunology, Immunotherapy

, Volume 32, Issue 6, pp 406–408 | Cite as

Acute and subacute toxicity of chemotactic conjugates between monoclonal antibody and fMet-Leu-Phe in humans: A phase I clinical trial

  • Reto Obrist
  • Jolanda Schmidli
  • Rita Müller
  • Harald Gallati
  • Jean Paul Obrecht
Short communication


Conjugates of the chemotactic peptide fMet-Leu-Phe (fMLP) to IgG retain chemotactic and antigen recognition function in vitro and enhance intra-tumour macrophage numbers in a guinea pig model. We report a study approved by the ethics committee on the acute toxicity of fMLP conjugates in ten consenting cancer patients with metastasizing melanoma and colon cancer. They were given increasing single doses (1–2500 µg) IgG-fMLP made with the anti-melanoma monoclonal antibody (mAb) 9.2.27. Clinical examinations and blood cell counts, urinalysis, electrolytes, and liver and kidney function tests before and after the infusion and weekly thereafter revealed no relevant toxicities. One patient had a herpes zooster exacerbation on day 1, which was judged to be coincidental. Peak post-infusion conjugate serum concentrations fell to unmeasurable levels within a few days. In no case was a human humoral anti-(mouse Ig) immune response detected.

Key words

Monoclonal antibodies Melanoma Chemotactic peptide 


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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • Reto Obrist
    • 1
  • Jolanda Schmidli
    • 1
  • Rita Müller
    • 1
  • Harald Gallati
    • 2
  • Jean Paul Obrecht
    • 1
  1. 1.Division of Oncology, Department of Internal Medicine of the University and Department of Research, KantonsspitalHoffmann-LaRoche Inc.BaselSwitzerland
  2. 2.Central Research UnitHoffmann-LaRoche Inc.BaselSwitzerland

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