Breast Cancer Research and Treatment

, Volume 110, Issue 2, pp 327–335 | Cite as

A phase II, randomized, blinded study of the farnesyltransferase inhibitor tipifarnib combined with letrozole in the treatment of advanced breast cancer after antiestrogen therapy

  • Stephen R. D. Johnston
  • Vladimir F. Semiglazov
  • George M. Manikhas
  • Dominique Spaeth
  • Gilles Romieu
  • David J. Dodwell
  • Andrew M. Wardley
  • Patrick Neven
  • Annick Bessems
  • Youn C. Park
  • Peter M. De Porre
  • Juan J. Perez Ruixo
  • Angela J. Howes
Clinical Trial

Abstract

Background

This study assessed the clinical efficacy of the farnesyltransferase inhibitor, tipifarnib, combined with letrozole in patients with advanced breast cancer and disease progression following antiestrogen therapy.

Patients and methods

Postmenopausal women with estrogen-receptor-positive advanced breast cancer that had progressed after tamoxifen were given 2.5 mg letrozole once daily and were randomly assigned (2:1) to tipifarnib 300 mg (TL) or placebo (L) twice daily for 21 consecutive days in 28-day cycles. The primary endpoint was objective response rate.

Results

Of 120 patients treated with TL (n = 80) or L (n = 40), 113 were evaluable for response. Objective response rate was 30% (95% CI; 20–41%) for TL and 38% (95% CI; 23–55%) for L. There was no significant difference in response duration, time to disease progression or survival. Clinical benefit rates were 49% (TL) and 62% (L). Tipifarnib was generally well tolerated; a higher incidence of drug-related asymptomatic grade 3/4 neutropenia was observed for TL (18%) than for L (0%). Tipifarnib population pharmacokinetics were similar to previous studies, with no significant difference in trough letrozole concentrations between the TL and L groups.

Conclusions

Adding tipifarnib to letrozole did not improve objective response rate in this population of patients with advanced breast cancer.

Keywords

Farnesyltransferase inhibitor Tipifarnib Breast cancer Letrozole 

Abbreviations

AE

Adverse event

CBR

Clinical benefit rates

CI

Confidence interval

CR

Complete response

ECOG

Eastern Cooperative Oncology Group

ER

Estrogen receptor

FTI

Farnesyltransferase inhibitor

L

Letrozole

NCI

National Cancer Institute

ORR

Objective response rate

PR

Partial response

PgR

Progesterone-receptor

RECIST

Response Evaluation Criteria in Solid Tumors

T

Tipifarnib

mTOR

Mammalian target of Rapamycin

TTF

Time to disease free survival

TTP

Time to disease progression

Notes

Acknowledgements

We would like to thank the patients who took part in this study. This study R115777-INT-22, was sponsored by Johnson & Johnson Pharmaceutical Research & Development, L.L.C. and was registered with ClinicalTrials.gov (NCT00050141). We would also like to thank Namit Ghildyal, Ph.D. for his writing contributions.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Stephen R. D. Johnston
    • 1
  • Vladimir F. Semiglazov
    • 2
  • George M. Manikhas
    • 3
  • Dominique Spaeth
    • 4
  • Gilles Romieu
    • 5
  • David J. Dodwell
    • 6
  • Andrew M. Wardley
    • 7
  • Patrick Neven
    • 8
  • Annick Bessems
    • 9
  • Youn C. Park
    • 9
  • Peter M. De Porre
    • 9
  • Juan J. Perez Ruixo
    • 9
  • Angela J. Howes
    • 9
  1. 1.Department of Medicine – Breast UnitRoyal Marsden NHS Foundation TrustLondonUK
  2. 2.N.N. Petrov Research Institute of OncologySt. PetersburgRussia
  3. 3.City Oncology DispensarySt. PetersburgRussia
  4. 4.Centre Alexis VautrinNancyFrance
  5. 5.Centre Val d’AurelleMontpellierFrance
  6. 6.Yorkshire Centre for Clinical OncologyLeedsUK
  7. 7.Christie HospitalManchesterUK
  8. 8.Dienst Gyneacologische OncologieLeuvenBelgium
  9. 9.Johnson & Johnson Pharmaceutical Research & Development, L.L.C.New BrunswickUSA

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