Effect of fenretinide on plasma IGF-I and IGFBP-3 in early breast cancer patients

Int J Cancer. 1998 Jun 10;76(6):787-90. doi: 10.1002/(sici)1097-0215(19980610)76:6<787::aid-ijc3>3.0.co;2-u.


Growing evidence substantiates the role of the insulin-like growth factor I (IGF-1) system in breast tumorigenesis. Retinoids have been shown to affect the IGF system several experimental models. We extended our previous data on plasma IGF-1 modulation by the synthetic retinoid fenretinide (4-HPR) and investigated the effect of the retinoid on plasma IGF binding protein (BP)-3, the major protein binding IGFs. IGF-1 and IGFBP-3 were measured on plasma samples obtained at randomization and after an interval of approximately 1 year, from 39 and 33 stage 1 breast cancer patients assigned to receive 4-HPR, and from 39 and 34 untreated controls, respectively. There was a significant decrease in plasma IGF-1 after 4-HPR administration, whereas no significant change was observed in controls. The effect of 4-HPR on IGF-1 levels was modified by menopausal status, inasmuch as the decrease in IGF-1 was particularly pronounced in pre-menopausal women, whereas the reverse was observed in untreated controls. By contrast, treatment induced an increase of IGFBP-3 with respect to controls. As a result of this dual effect, the bioavailability of IGF-1 for interaction with receptors at target levels further decreased in pre-menopausal 4-HPR treated patients compared with controls, suggesting that retinoid administration may result in lower concentrations of biologically active IGF-1. Our findings may have important implications for the clinical preventive activity of this retinoid.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adult
  • Aged
  • Anticarcinogenic Agents / pharmacology*
  • Breast Neoplasms / blood*
  • Female
  • Fenretinide / pharmacology*
  • Humans
  • Insulin-Like Growth Factor Binding Protein 3 / blood*
  • Insulin-Like Growth Factor I / analysis*
  • Middle Aged


  • Anticarcinogenic Agents
  • Insulin-Like Growth Factor Binding Protein 3
  • Fenretinide
  • Insulin-Like Growth Factor I