That does not mean you should take it as a way to prevent cancer, it is an endocrine disruptor that binds to estrogen with 20,000X the effect of compounds like BPA that environmentalists tried to claim are too risky in food containers, and this study is EXPLORATORY. With enough data, Australians could link voting for the Liberal Party to lower risk of diseases. Epidemiology can link anything to anything.
The analysis of 221,732 females in the UK Biobank also linked some biomarkers to ovarian cancer risk, including several characteristics of red blood cells and certain liver enzymes in the blood, but they also found being thin and short lowered risk so terms like "suggests" "linked to" "correlated" and "associated" show that science is not yet involved. That those with two or more children had a 39% reduced risk of developing ovarian cancer compared to those who had not had children is a reader's insight that there is no plausible biological mechanism for how they could be connected.

Credit: Storyblocks
The data set is also small. There were 1,786 diagnoses in Australia, where the creators of the data analysis live, and 1,050 dead from it in 2023, and like using one year of marriages and divorces taken out of context that can't tell us much. What would help is if AI could diagnose ovarian cancer but expensive tests for every woman with one child or less is not going to happen. If more estrogen causes less ovarian cancer an entire industry built around scaring the public regarding endocrine disruptors is going out of business. Early detection would be valuable but it needs more than statistics.
They might have something in there. They included 3,000 characteristics related to health, some of which were measured at the start of the UK project. If, as they claim, some blood measures, taken on average 12.6 years before diagnoses, are predictive of ovarian cancer risk, that would certainly be compelling.
“Ovarian cancer is notoriously diagnosed at a late stage, with about 70% of cases only identified when they are significantly advanced,” notes Dr. Amanda Lumsden of the University of South Australia. “Late detection contributes to a survival rate of less than 30% over five years, in comparison to more than 90% for ovarian cancers that are caught early. That’s why it’s so important to identify risk factors."
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