Impact of Chemotherapy on Breast Cancer Recurrence
Author Information
Author(s): M.N. Levine, V. Bramwell, H. Abu-Zahra, M.D. Goodyear, A. Arnold, B. Findlay, J. Skillings, M. Gent
Primary Institution: Ontario Cancer Treatment and Research Foundation
Hypothesis
Does the duration of adjuvant chemotherapy affect local breast recurrence rates in node-positive breast cancer patients treated by lumpectomy without radiation?
Conclusion
Adjuvant chemotherapy impacts local breast recurrence rates, with a shorter 12-week regimen resulting in higher recurrence compared to a 36-week regimen.
Supporting Evidence
- Local breast recurrence rates were higher in the 12-week chemotherapy group compared to the 36-week group.
- 38 patients in the 12-week group experienced recurrence compared to 22 in the 36-week group.
- The cumulative rate of local breast recurrence was 39% in the 12-week group versus 23% in the 36-week group.
- The study included 122 patients who underwent lumpectomy without radiation.
Takeaway
This study found that women with breast cancer who had a shorter chemotherapy treatment were more likely to have their cancer come back compared to those who had a longer treatment.
Methodology
A randomized trial comparing two chemotherapy regimens (12 weeks vs. 36 weeks) in women with node-positive breast cancer who underwent lumpectomy without radiation.
Limitations
The study did not include patients who received postoperative breast irradiation, which may limit the generalizability of the findings.
Participant Demographics
Women under the age of 70 years with histologically confirmed axillary node-positive breast cancer.
Statistical Information
P-Value
0.02
Statistical Significance
p<0.05
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