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Effects of Radiotherapy in Early-Stage, Low-Recurrence Risk, Hormone-Sensitive Breast Cancer.
- Source :
- JNCI: Journal of the National Cancer Institute; Dec2018, Vol. 110 Issue 12, p1370-1379, 10p, 1 Diagram, 4 Charts, 1 Graph
- Publication Year :
- 2018
-
Abstract
- <bold>Background: </bold>Radiotherapy after breast conservation has become the standard of care. Prior meta-analyses on effects of radiotherapy predated availability of gene expression profiling (GEP) to assess recurrence risk and/or did not include all relevant outcomes. This analysis used GEP information with pooled individual-level data to evaluate the impact of omitting radiotherapy on recurrence and mortality.<bold>Methods: </bold>We considered trials that evaluated or administered radiotherapy after lumpectomy in women with low-risk breast cancer. Women included had undergone lumpectomy and were treated with hormonal therapy for stage I, ER+ and/or PR+, HER2- breast cancer with Oncotype scores no greater than 18. Recurrence-free interval (RFI), type of RFI (locoregional or distant), and breast cancer-specific and overall survival were compared between no radiotherapy and radiotherapy using adjusted Cox models. All statistical tests were two-sided.<bold>Results: </bold>The final sample included 1778 women from seven trials. Omission of radiotherapy was associated with an overall adjusted hazard ratio of 2.59 (95% confidence interval [CI] = 1.38 to 4.89, P = .003) for RFI. There was a statistically significant increase in any first locoregional recurrence (P = .001), but not distant recurrence events (P = .90), or breast cancer-specific (P = .85) or overall survival (P = .61). Five-year RFI rate was high (93.5% for no radiotherapy vs 97.9% for radiotherapy; absolute reduction = 4.4%, 95% CI = 0.7% to 8.1%, P = .03). The effects of radiotherapy varied across subgroups, with lower RFI rates for those with Oncotype scores of less than 11 (vs 11-18), older (vs younger), and ER+/PR+ status (vs other).<bold>Conclusions: </bold>Omission of radiotherapy in hormone-sensitive patients with low recurrence risk may lead to a modest increase in locoregional recurrence event rates, but does not appear to increase the rate of distant recurrence or death. [ABSTRACT FROM AUTHOR]
- Subjects :
- RADIOTHERAPY
BREAST cancer treatment
HORMONES
GENE expression
MEDICAL care
Subjects
Details
- Language :
- English
- ISSN :
- 00278874
- Volume :
- 110
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- JNCI: Journal of the National Cancer Institute
- Publication Type :
- Academic Journal
- Accession number :
- 133601193
- Full Text :
- https://doi.org/10.1093/jnci/djy128