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Aspirin could play valuable role as additional treatment for cancer

Aspirin could play valuable role as additional treatment for cancer

Coated aspirin tablets. Image: Wikimedia Commons.

Regular use of aspirin could help in the treatment of some cancers, finds a new review of 71 medical studies.

The systematic review, which looked at the survival of 120,000 patients with cancer who took aspirin, compared with 400,000 patients who did not, showed that at any time following the diagnosis of some cancers the proportion of patients who were still alive was 20-30% greater in those taking the drug. The spread of cancer to other parts of the body was also substantially reduced in patients using aspirin.

Peter Elwood, Honorary Professor at Cardiff University, who directed the study said: “The use of low-dose aspirin as a preventive in heart disease, stroke and cancer is well established but evidence is now emerging that the drug may have a valuable role as an additional treatment for cancer too.”

One of the colon cancer studies the researchers looked at suggested that a non-diabetic man of about 65 years who takes aspirin would have a prognosis similar to that of a man five years his junior who takes none. For a woman of similar age with colon cancer the addition of aspirin could lead to a similar prognosis of a woman four years younger.

Almost half the studies included in the review were of patients with bowel cancer, and most of the other studies were of patients with breast or prostate cancer. There were very few studies of patients with other less common cancers, but on the whole the pooled evidence for all the cancers is suggestive of benefit from aspirin.

All this evidence of benefit is however limited. First, it comes from observational studies of patients who took aspirin for reasons other than the treatment of cancer, and not from appropriate randomised trials designed to test aspirin and cancer.

Furthermore, the evidence is not entirely consistent and a few of the studies failed to detect benefit attributable to aspirin. More evidence is therefore urgently needed. A number of new randomised trials have been set up, but these are unlikely to report for quite a few years.

The issue of bleeding was examined carefully in the review. Information on bleeding was requested from an author of each of the 71 reports and replies were received from 31 authors.

Very few patients had serious bleeding. Amongst those who had, the proportion of patients taking aspirin who had a ‘serious’ bleed was no greater than the proportion of patients not taking aspirin who had experienced a ‘spontaneous’ stomach bleed due to causes other than aspirin. In two studies a very small number of fatal stomach bleeds had occurred, but again the proportion was no greater in the patients on aspirin than in those not taking aspirin.

Peter Elwood, Honorary Professor at Cardiff University, who directed the study says: “Patients with cancer should be given the evidence now available and be helped to make their own judgement of the balance between the risks and the benefits of daily low dose. Evidence from further studies is urgently required, and patients should be strongly encouraged to participate in appropriate research studies.

“All patients should consult their GP before starting new medication.”

The research “Systematic review update of observational studies further supports aspirin role in cancer treatment: time to share evidence and decision-making with patients?” is published in Plos One Medicine.


Explore further:
Aspirin use doesn’t cut cancer incidence in older T2DM patients

More information:
Peter C. Elwood et al. Systematic review update of observational studies further supports aspirin role in cancer treatment: Time to share evidence and decision-making with patients?, PLOS ONE (2018). DOI: 10.1371/journal.pone.0203957

Journal reference:
PLoS ONE

Provided by:
Cardiff University

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