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Dr Paolo Boffetta, of the Unit of Environmental Cancer Epidemiology of the International Agency for Research on Cancer in Lyon, France, who worked on the study, said: "We do not really know if asthma as such causes the increased risk".
BBC: Women are at greater risk than men
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The World Health Organization's International Agency for Research on Cancer is coordinating Interphone.
CNN: Study fails to end debate on cancer, cell phone link
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This might "translate into one or two more years of life" for a regular supplement taker, says lead author Philippe Autier of the International Agency for Research on Cancer.
FORBES: D Is for Debate
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In Europe, about half the adult population is currently overweight, and urban areas of many developing countries have a similar prevalence, according to the International Agency for Research on Cancer.
BBC: Breast cancer risk for large mums
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And there is no animal evidence either that it is a carcinogen, he added, saying that "phenylbutazone is not classifiable as to its carcinogenicity" according to the International Agency for Research on Cancer.
BBC: Contaminated horsemeat sold for food, FSA admits
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The International Agency for Cancer Research has previously identified working shift patterns that disrupt the body's natural "clock" as a probable cause of cancer.
BBC: 'Night shift link' to ovarian cancer