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Primary chemotherapy with CEF-infu
Breast Cancer Research volume 4, Article number: 74150 (2002)
Neoadjuvant chemotherapy for large operable (LO) or locally advanced (LA) breast cancer (BC) has been shown to increase the rate of conserving breast surgery, without compromising overall survival. However, the optimal regimen remains unknown. Previous studies using infusional 5-FU (5-FU-infu) in association with epirubicin and cisplatin/carboplatin (ECisF) for LO and/or LABC have shown high response rates and good tolerability. The dose of epirubicin used in those studies was 50 mg/m2, q3w. As there is a well-known dose-response effect for anthracyclines, the aim of this study was to identify the maximum tolerated dose of epirubicin, when given in association with the other two drugs.
A total of 21 patients (11 LO, 8 LABC) were treated, with a median of 5 cycles per patient. An interim analysis showed that grade 3 palmar-plantar erythrodysesthesia (PPE) occurred in 5/16 patients at the 3 dose levels. Accordingly, the protocol was amended to limit the duration of 5-FU-infu from 4 to 3 weeks. Dose limiting toxicities were grade 3 febrile neutropenia (FN), grade 3 mucositis, and grade 3 infection. Epirubicin 60 mg/m2, day 1 & 8, q4w was considered the recommended dose. Objective responses were seen in 75% (15/20) of evaluable patients.
This study demonstrates the feasibility of the combination of 5-FU-infu with an escalating dose of epirubicin. The rate of haematological toxicity and/or FN (13% on dose level 3) was lower than the one seen with Canadian FEC (see Additional information) at epirubicin 120 mg/m2/cycle without prophylactic antibiotics (18.8%). However, PPE was a major toxicity, particularly with the 4-week 5-FU-infu. The increase time exposure to epirubicin, due to the day 1 and 8 fractionation, is proposed as a possible explanation (31% vs 10% with other regimens using 5-FU-infu). This fractionation concomitantly with 5-FU-infu could result in cutaneous accumulation of both dugs, leading to an increased rate of PPE. After the protocol amendment no grade 3 PPE was seen. Given the encouraging clinical activity of this regimen, a new study was recently activated with capecitabine replacing 5-FU-infu. Given the heterogeneous bioavailability and the toxicity profile (mainly PPE and diarrhoea) of capecitabine, infusional 5-FU is still a regimen to consider in the metastatic setting. Despite being a phase I study, it would be interesting to know the percentage of patients that underwent conserving surgery or mastectomy and the pathological responses obtained.
Phase I clinical trial, dose escalation
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Bonnefoi H, Biganzoli L, Cufer T, Mauriac L, Hamilton A, Schaefer P, Piccart M: An EORTC phase I study of epirubicin in combination with fixed doses of cyclophosphamide and infusional 5-FU (CEF-infu) as primary treatment of large operable or locally advanced/inflammatory breast cancer. Breast Cancer Res Treat. 2001, 70: 55-63.
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Cardoso, F. Primary chemotherapy with CEF-infu. Breast Cancer Res 4, 74150 (2002). https://doi.org/10.1186/bcr-2002-74150
- Breast cancer, CEF-infu, phase I, primary chemotherapy