Study: Connection Found Between BPA Exposure, Brain Tumor Diagnosis
July 3, 2012 9:37 AM
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Bisphenol A is considered a toxic substance in some countries because of the hormone-like properties it possess
A new study shows that
bisphenol A exposure
could help cause a brain tumor called meningioma.
Bisphenol A (BPA) is an organic compound that is used to make epoxy resins, polycarbonate polymers and other plastics. It is considered a toxic substance in some countries because of the hormone-like properties it possess.
and the European Union have even banned it from being used in baby bottles.
Now, a new study from China has revealed that BPA could be a risk factor for meningioma brain tumors. They made this connection by studying 247 patients with meningioma and 258 patients with no cancer history. Each patient had their medical records and history collected for the sake of the study.
All patients were observed at the Union Hospital in Wuhan, China. The researchers would check
the brain tumors
with brain scans or biopsies while BPA levels were identified through urine samples.
All volunteers were placed into one of four groups, which were determined by the concentration of BPA levels in urine. The groups consisted of less than 0.53 ng/ml, 0.54-0.91 ng/ml, 0.92-1.69 ng/ml, and over 1.69 ng/ml. They determined whether increasing BPA levels in urine were linked to meningioma diagnosis.
According to the results, patients in the latter three groups with the higher BPA concentrations were 1.4 to 1.6 times more likely to be diagnosed with meningioma than those in the lowest BPA level group. The team also found that the association between the two remained consistent despite other factors like BMI, age and gender.
The study noted that this is the first time a link has been shown between BPA exposure and meningioma diagnosis.
Environmental Health News
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RE: Bad Science?
7/5/2012 7:51:50 PM
There is one major flaw with this work. EDIT: just saw the sourced page discusses what I was about to write about. keeping it brief.
The very crucial matter of the grouping of patients and associated statistical tests by a
urine test is quite flawed.
One snapshot of the amount of BPA onboard in these patients is almost completely useless in establishing BPA as a chronic factor or even a factor at all in these tumors. Evidence suggests that BPA is rapidly cleared from the body. If this is the case then to establish a biological relationship, the authors would have had to do a prospective/longitudinal design with frequent urine samples.
It is necessary to show that the meningioma patients were
exposed to higher BPA levels. They also need to show that the levels were high when the tumor was forming. Looks like their urine test is at time of diagnosis meaning they may have missed the important urine samples, potentially, by years.
An idea for longitudinal testing is that it be anchored around a meal like dinner. That way all patients will be in the same pharmacokinetic/dynamic state and differences in urine samples between subjects with identical BPA intake should be minimized. Given identical BPA intake, imagine someone being tested 5 hours after the BPA intake versus 1 hour. The 1 hour subject should look like they got way more BPA than the 5 hour.
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