Docetaxel With Cyclophosphamide Is Associated With an Overall Survival Benefit Compared With Doxorubicin and Cyclophosphamide: 7-Year Follow-Up of US Oncology Research Trial 9735

J Clin Oncol. 2009 Mar 10;27(8):1177-83. doi: 10.1200/JCO.2008.18.4028. Epub 2009 Feb 9.


Purpose: We previously reported that four cycles of docetaxel/cyclophosphamide (TC) produced superior disease-free survival (DFS) compared with four cycles of doxorubicin/cyclophosphamide (AC) in early breast cancer. Older women are under-represented in adjuvant chemotherapy trials. In our trial 16% of patients were > or = 65 years. We now report 7-year results for DFS and overall survival (OS) as well as the impact of age, hormone receptor status, and HER2 status on outcome and toxicity.

Patients and methods: Patients were randomly assigned to receive either four cycles of standard-dose AC (60/600 mg/m(2); n = 510), or TC (75/600 mg/m(2); n = 506), administered by intravenous infusion every 3 weeks.

Results: The median age in women younger than 65, was 50 years (range, 27 to 64) and for women > or = 65 was 69 years (range, 65 to 77). Baseline characteristics in the two age subgroups were generally well matched, except that older women tended to have more lymph node involvement. At a median of 7 years follow-up, the difference in DFS between TC and AC was significant (81% TC v 75% AC; P = .033; hazard ratio [HR], 0.74; 95% CI 0.56 to 0.98) as was OS (87% TC v 82% AC; P = .032; HR, 0.69; 95% CI, 0.50 to 0.97). TC was superior in older patients as well as younger patients. There was no interaction of hormone-receptor status or HER-2 status and treatment. Older women experienced more febrile neutropenia with TC and more anemia with AC.

Conclusion: With longer follow-up, four cycles of TC was superior to standard AC (DFS and OS) and was a tolerable regimen in both older and younger patients.

Publication types

  • Clinical Trial, Phase III
  • Comparative Study
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Antineoplastic Combined Chemotherapy Protocols / therapeutic use*
  • Breast Neoplasms / chemistry
  • Breast Neoplasms / drug therapy*
  • Breast Neoplasms / mortality
  • Cyclophosphamide / administration & dosage
  • Cyclophosphamide / adverse effects
  • Docetaxel
  • Doxorubicin / administration & dosage
  • Doxorubicin / adverse effects
  • Follow-Up Studies
  • Humans
  • Middle Aged
  • Prospective Studies
  • Receptor, ErbB-2 / analysis
  • Taxoids / administration & dosage
  • Taxoids / adverse effects


  • Taxoids
  • Docetaxel
  • Doxorubicin
  • Cyclophosphamide
  • ERBB2 protein, human
  • Receptor, ErbB-2