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J Clin Oncol. 2007 Feb 20;25(6):656-61.

Sequenced compared with simultaneous anthracycline and cyclophosphamide in high-risk stage I and II breast cancer: final analysis from INT-0137 (S9313).

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1
Puget Sound Oncology Consortium, Southwest Oncology Group Statistical Center, Seattle, WA, USA.

Abstract

PURPOSE:

We conducted a phase III randomized study of two adjuvant treatment schedules of doxorubicin (A) and cyclophosphamide (C) in early-stage breast cancer to determine if administration of sequential single agents (A --> C) results in superior disease-free survival (DFS) and overall survival (OS) versus the same total dose given in combination (AC).

PATIENTS AND METHODS:

High-risk node-negative or low-risk node-positive breast cancer patients received AC given: (arm I) concurrently (AC) doxorubicin 54 mg/m2 and cyclophosphamide 1.2 g/m2 intravenously (IV) every 3 weeks for six cycles; or (arm II) in sequence (A C) doxorubicin 40.5 mg/m2 IV days 1 and 2 every 3 weeks for four cycles followed by cyclophosphamide 2.4 gm/m2 IV every 2 weeks for three cycles. Total dose and duration were identical, but the intensity of each drug was increased on A C. Both arms included granulocyte colony-stimulating factor support and prophylactic antibiotics. All but premenopausal women with receptor negative tumors received tamoxifen after chemotherapy.

RESULTS:

Between 1994 and 1997, 3,176 patients were randomly assigned. Arms were well balanced; 48% of eligible patients were node-negative and 48% were estrogen receptor-positive. No significant differences in OS or DFS were observed; 5-year estimates of OS (95% CI) were 88% (87% to 90%) on AC and 89% (87% to 91%) on A --> C. Grade 4 hematologic toxicity was greater on A --> C, but nonhematological grade 4 was similar.

CONCLUSION:

The overall result does not support superiority of dose-intense sequenced single agents. The greater toxicity of higher doses of single agents does not support their sequential use.

PMID:
17308269
DOI:
10.1200/JCO.2006.07.0847
[Indexed for MEDLINE]

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