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Adjuvant Hormone Therapy-Related Hot Flashes Predict Treatment Discontinuation and Worse Breast Cancer

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HARBORSIDE PRESS
DOI: 10.6004/jnccn.2021.7116

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Hormone therapy-related hot flashes may indicate worse breast cancer outcomes and higher treatment discontinuation rates among patients, particularly those with low income or without relatives who have had cancer or died from cancer.
Background: Clinical trials have shown that adjuvant hormone therapy (AHT)-related hot flashes can predict better breast cancer outcomes. This population-based cohort study investigated whether this result can be generalized to a real-world setting. Patients and Methods: By linking the National Quality Registry for Breast Cancer, Prescribed Drug Register, and Cause-of-Death Register, we identified 7,152 chemotherapy-free patients with breast cancer who initiated AHT in Stockholm from 2006 through 2019, and followed them until 2020. Hot flashes were defined as new use of drugs for hot flashes within 6 months after initiating AHT. We used Cox models to compare disease-free survival and treatment discontinuation among patients with and without hot flashes. Results: Patients who newly used drugs for hot flashes shortly after AHT initiation had worse disease-free survival (adjusted hazard ratio [HR], 1.67; 95% CI, 1.11-2.52) and a higher treatment discontinuation rate (adjusted HR, 1.47; 95% CI, 1.21-1.78). The association between drugs for hot flashes and discontinuation of AHT differed by patient characteristics, with stronger associations among low-income patients (HR, 1.91; 95% CI, 1.41-2.59) and those without first-degree relatives who had cancer (HR, 1.81; 95% CI, 1.39-2.35) or died from cancer (HR, 1.71; 95% CI, 1.37-2.12). Conclusions: AHT-related hot flashes predict worse, rather than better, breast cancer outcomes among patients in clinical routine practice. The identification of adverse effects by the initiation of hot flash medications may identify a subset of patients with more severe hot flashes who are more likely to discontinue AHT and need more support for treatment adherence. J Natl Compr Canc Netw 2022;20(6):683-689.e2 doi: 10.6004/jnccn.2021.7116

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