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Experts say more research is needed into the side effects of aspirin before it is officially recommended for treating cancer.
A Dutch study published today in the British Journal of Cancer suggests the drug can help bowel cancer patients.
"This latest study adds to the growing evidence about the benefits of aspirin," said Sarah Lyness of Cancer Research UK.
"But we are not yet at the point where we would recommend people start taking aspirin to reduce their chances of developing cancer.
"There are still questions we need to answer about the side effects. Aspirin can increase the chances of complications before surgery.
"Anyone thinking of taking aspirin to cut their risk of cancer should talk to their GP first."
Patients too old or too unwell to have chemotherapy could benefit from taking aspirin to treat bowel cancer, according to researchers at the Leiden University Medical Centre in the Netherlands.
The team is planning a randomised controlled trial later this year targeting the over-70s population.
Researchers from the Netherlands have found that taking a daily dose of aspirin for any length of time after being diagnosed with bowel cancer will reduce the risk of dying from the disease by 23%.
Taking a daily dose of the pain killer for at least nine months after being diagnosed cuts the likelihood of dying from the disease by 30%.
Aspirin can reduce the chances of dying from bowel cancer by almost a third, according to research.
Patients who took a daily dose of aspirin for at least nine months after being diagnosed with the cancer cut the likelihood of the disease by 30%.