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No association between low-dose aspirin use and breast cancer outcomes overall [Elektronisk resurs] a Swedish population-based study

Frisk, Gabriella, 1971- (författare)
Ekberg, Sara (författare)
Lidbrink, Elisabet (författare)
Eloranta, Sandra (författare)
Sund, Malin (författare)
Fredriksson, Irma (författare)
Lambe, Mats (författare)
Smedby, Karin E. (författare)
Umeå universitet Medicinska fakulteten (utgivare)
Publicerad: BioMed Central, 2018
Engelska.
Ingår i: Breast Cancer Research. - 1465-5411. ; 20
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  • Background: Results from previous studies indicate that use of low-dose aspirin may improve breast cancer prognosis. We evaluated aspirin use and breast cancer outcomes in relation to clinical characteristics as well as dose and duration of aspirin use. Methods: We used information from the Regional Breast Cancer Quality-of-Care Registries in three Swedish regions to identify 21,414 women diagnosed with a first stage I-III breast cancer between 1 April 2006 and 31 December 2012. The cohort was further linked to nationwide registers to retrieve information about dispensing low-dose aspirin before and after breast cancer diagnosis, comorbidity and causes of death. In a separate analysis, we investigated time to breast cancer death among 621 women with stage IV disease at diagnosis. Associations were evaluated using a multivariable Cox proportional hazards model. Results: Among women with stage I-III breast cancer, 2660 (12.4%) used low-dose aspirin shortly before breast cancer diagnosis and 4091 (19.1%) were users during follow-up. Women were followed for a median of 3.8years after diagnosis. There was no association between aspirin use and breast cancer-specific death in multivariable analyses (use before diagnosis: hazard ratio (HR) 0.93, 95% confidence interval (CI) 0.77-1.12; use after diagnosis: HR 1.00, 95% CI 0.74-1.37). Similarly, aspirin use was not associated with risk of first recurrence/metastases in a subgroup of stage I-III breast cancer patients (HR 0.97, 95% CI 0.86-1.10). However, in analyses stratified by stage, an inverse association between low-dose aspirin use after diagnosis and breast cancer death was found for women with stage I tumors (HR 0.53, 95% CI 0.29-0.96). Among women with stage IV disease at diagnosis, aspirin use was not associated with time to breast cancer death (HR 0.91, 95% CI 0.67-1.23). Conclusion: In this large population-based cohort study there was no evidence that low-dose aspirin use before or after breast cancer diagnosis is associated with a reduced risk of adverse outcomes overall in breast cancer. However, a potential benefit was noted among women with stage I tumors, warranting further investigation. 

Ämnesord

Medical and Health Sciences  (hsv)
Clinical Medicine  (hsv)
Cancer and Oncology  (hsv)
Medicin och hälsovetenskap  (hsv)
Klinisk medicin  (hsv)
Cancer och onkologi  (hsv)

Genre

government publication  (marcgt)

Indexterm och SAB-rubrik

Aspirin
Breast cancer
Sweden
Registers
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