Breast Cancer Research and Treatment

, Volume 98, Issue 2, pp 133–141 | Cite as

AFPep: an anti-breast cancer peptide that is orally active

  • James A. BennettEmail author
  • Lori DeFreest
  • Ikenna Anaka
  • Hamid Saadati
  • Sujata Balulad
  • Herbert I. Jacobson
  • Thomas T. Andersen
Preclinical study



We have synthesized a cyclic nonapeptide (AFPep) that is effective, after being administered by parenteral routes, for the treatment or the prevention of breast cancer. To test the hypothesis that AFPep remains safe and efficacious after oral administration, three different whole-animal bioassays were utilized, and the mechanism by which AFPep functions was investigated.


Using a human breast cancer xenograft model in mice for therapeutic activity, a carcinogen-induced breast cancer model in rats for prevention efficacy, and a mouse uterus growth inhibition model of anti-estrogenic activity, AFPep was administered by oral gavage (p.o.) and its effects compared to those following intraperitoneal (i.p.) and subcutaneous (s.c.) administration. Toxicity studies evaluated body weights and organ weights in mice and rats receiving AFPep. Preliminary mechanistic studies were carried out in T47D human breast cancer cells growing in culture and evaluated the effect of AFPep on estrogen-stimulated cell growth, phosphorylation of the estrogen receptor (ER), and on level of ER-related kinases.


Orally administered AFPep stopped the growth of human tumor xenografts in mice, decreased the incidence and multiplicity of breast cancers in carcinogen-exposed rats, and inhibited the estrogen-stimulated growth of mouse uteri. In each of these systems, orally administered AFPep produced an effect similar to that obtained for AFPep administered by either i.p or s.c. routes. In rodents, no evidence of toxicity was seen for the peptide, even at very high doses. In culture, AFPep inhibited the estrogen-stimulated growth, but not the basal growth, of T47D cells, and it inhibited the estrogen-stimulated phosphorylation of Serine 118 in the ER of these cells, which was not explainable by early changes in ER-related kinases.


Chronic oral administration of AFPep appears to be safe and effective for the treatment or prevention of breast cancer in animal models.


animal models breast cancer oral availability prevention therapy toxicity 





synthetic peptide and active site analog of AFP


Dulbecco’s minimal essential medium


estrogen receptor alpha




high pressure liquid chromatography


intraperitoneal administration




oral administration


subcutaneous administration


severe combined immunodeficient mice


sodium dodecyl sulfate polyacrylamide gel electrophoresis


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This work was supported by the NIH (R01 CA102540), the Department of Defense (DAMD17–02–1–0269) and the Susan B. Komen Foundation (DISS-0201775).


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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • James A. Bennett
    • 1
    • 4
    Email author
  • Lori DeFreest
    • 1
  • Ikenna Anaka
    • 2
  • Hamid Saadati
    • 2
  • Sujata Balulad
    • 1
  • Herbert I. Jacobson
    • 1
    • 3
  • Thomas T. Andersen
    • 2
  1. 1.Center for Immunology and Microbial DiseasesAlbany Medical CollegeAlbanyUSA
  2. 2.Center for Cardiovascular SciencesAlbany Medical CollegeAlbanyUSA
  3. 3.Department of Obstetrics, Gynecology and Reproductive SciencesAlbany Medical CollegeAlbanyUSA
  4. 4.Center for Immunology and Microbial Diseases MC-22Albany Medical CollegeAlbanyUSA

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