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Aspirin may interact with cells' DNA modifications to alter breast cancer outcomes


A study has shown that women with specific DNA characteristics in certain areas of the genome may live longer if they take Aspirin [ Acetylsalicylic acid ] before they are diagnosed with breast cancer.
Published in Cancer, a peer-reviewed journal of the American Cancer Society ( ACS ), the findings point to the need for studies on the potential of Aspirin to prevent or treat breast cancer in some individuals.

It is often unclear why some patients benefit from a particular therapy while others do not. In some cases, gene sequences play a role, but in other cases, chemical modifications to DNA may be important. The latter are termed epigenetic changes, and they include a process called DNA methylation.

Researchers at University of North Carolina at Chapel Hill, have verified whether DNA methylation may influence the effects of Aspirin in patients with breast cancer.
They examined DNA methylation in breast tumor tissues--including at DNA sites that control the expression of 13 breast cancer-related genes--and also in cells circulating in patients' blood.

The study is the first to examine the effect of DNA methylation on the association between Aspirin use and mortality in women with breast cancer.

In the study of 1266 women who were diagnosed with breast cancer during the 1996-1997 period, 476 died from any cause and 202 died specifically from breast cancer by the end of 2014.

In women who used Aspirin, the risk of dying from any cause and the risk of dying from breast cancer was lower among those whose DNA was not methylated in the region that controlled expression of the breast cancer-related BRCA1 gene.
Other methylation patterns related to Aspirin use and mortality were also observed.

The researchers noted that the findings could help identify individuals who may benefit from Aspirin after a breast cancer diagnosis due to their cells' DNA methylation profile.
Future research should consider a more comprehensive DNA methylation profile in order to better characterize women who are at risk.

Consideration of DNA methylation profiles as potential modifiers of the Aspirin-mortality association may provide new insights on the underlying biological mechanisms on Aspirin use in relation to mortality after breast cancer diagnosis.
The findings, if confirmed, may also impact clinical decision-making by identifying a subgroup of patients, using epigenetic markers, for whom pre-diagnosis aspirin use impacts subsequent mortality, and may help refine risk reduction strategies to improve survival among women with breast cancer. ( Xagena )

Source: Cancer, 2019

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