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