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Meta-Analysis
. 2003;2003(2):CD002747.
doi: 10.1002/14651858.CD002747.

Chemotherapy alone versus endocrine therapy alone for metastatic breast cancer

Affiliations
Meta-Analysis

Chemotherapy alone versus endocrine therapy alone for metastatic breast cancer

N Wilcken et al. Cochrane Database Syst Rev. 2003.

Abstract

Background: Both chemotherapy and endocrine therapy can be used as treatments for metastatic breast cancer.

Objectives: To review the evidence and determine whether chemotherapy or endocrine therapy has the most beneficial effect on treatment outcomes (survival, response rate, toxicity and quality of life).

Search strategy: The specialised register maintained by the Editorial Base of the Cochrane Breast Cancer Group was searched on 16th September 2002 using the codes for "advanced breast cancer", "chemotherapy" and "endocrine therapy". Details of the search strategy applied by the Group to create the register, and the procedure used to code references, are described in the Group's module on the Cochrane Library.

Selection criteria: Randomised trials comparing the effects of chemotherapy alone with endocrine therapy alone on pre-specified endpoints in metastatic breast cancer.

Data collection and analysis: Data were collected from published trials. Hazard ratios were derived for survival analysis and a fixed effect model was used for meta-analysis. Response rates were analysed as dichotomous variables. Toxicity and quality of life data were extracted where present.

Main results: The primary analysis of overall effect using hazard ratios derived from published survival curves involved six trials (692 women). There was no significant difference seen (HR=0.94, 95%CI 0.79-1.12, p=0.5). A test for heterogeneity was p=0.1. A pooled estimate of reported response rates in eight trials involving 817 women shows a significant advantage for chemotherapy over endocrine therapy with RR=1.25 (1.01-1.54, p=0.04). However the two largest trials showed trends in opposite directions, and a test for heterogeneity was p=0.0018. There was little information available on toxicity and quality of life. Six of the seven fully published trials commented on increased toxicity with chemotherapy, mentioning nausea, vomiting and alopecia. Three of the seven mentioned aspects of quality of life, with differing results. Only one trial formally measured quality of life, concluding that it was better with chemotherapy.

Reviewer's conclusions: In women with metastatic breast cancer and where hormone receptors are present, a policy of treating first with endocrine therapy rather than chemotherapy is recommended except in the presence of rapidly progressive disease.

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Conflict of interest statement

None known

Figures

1.1
1.1. Analysis
Comparison 1: Endocrine therapy versus chemotherapy, Outcome 1: Tumour response rate
1.2
1.2. Analysis
Comparison 1: Endocrine therapy versus chemotherapy, Outcome 2: Mortality at 12 months
1.3
1.3. Analysis
Comparison 1: Endocrine therapy versus chemotherapy, Outcome 3: Mortality at 24 months
1.4
1.4. Analysis
Comparison 1: Endocrine therapy versus chemotherapy, Outcome 4: Hazard ratio for overall mortality
1.5
1.5. Analysis
Comparison 1: Endocrine therapy versus chemotherapy, Outcome 5: Hazard ratio for overall mortality without Priestman
1.6
1.6. Analysis
Comparison 1: Endocrine therapy versus chemotherapy, Outcome 6: Tumour response rate (with Rosner)
1.7
1.7. Analysis
Comparison 1: Endocrine therapy versus chemotherapy, Outcome 7: Overall mortality by quality

References

References to studies included in this review

Abe 1995 {published data only}
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    1. ANZBCTG. A randomized trial in postmenopausal patients with advanced breast cancer comparing endocrine and cytotoxic therapy given sequentially or in combination. The Australian and New Zealand Breast Cancer Trials Group, Clinical Oncological Society of Australia. Journal of Clinical Oncology 1986;4(2):186-93. - PubMed
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Clavel 1982 {published data only}
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Dixon 1992 {published data only}
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References to studies excluded from this review

Auperin 1995a {published data only}
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References to other published versions of this review

Wilcken 2003
    1. Wilcken N, Hornbuckle J, Ghersi D. Chemotherapy alone versus endocrine therapy alone for metastatic breast cancer. Cochrane Database of Systematic Reviews 2003, Issue 2. Art. No: CD002747. [DOI: 10.1002/14651858.CD002747] - DOI - PMC - PubMed

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