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Tracking what shoppers buy through loyalty-card data could help spot those people with early signs of cancer, say doctors who ran a study.
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They found that frequent purchases of over-the-counter pain relievers and indigestion pills were associated with a higher risk of ovarian cancer.
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There is no reliable screening test and symptoms, such as swelling, can be vague and confused with other common, harmless conditions.
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Symptoms include swollen or bloated stomach, indigestion, pelvic or abdominal pain, loss of appetite or feeling full soon after eating, need to urinate more often
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She had been having stomach cramps and indigestion for a few years, which other doctors repeatedly thought might be irritable-bowel syndrome.
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Long before women have recognized their symptoms as dangerous enough to go to the GP, they can treat them at home.
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The researchers worked with two large high street retailers and 283 female customers who agreed to share their shopping data dating back more than six years.
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More research is needed to confirm the findings. The team now plans to test whether the shopping data could also help detect other cancers - such as stomach, liver and bladder cancer.
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