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One thing this research clearly demonstrates is how difficult it is to tie down whether something like this is indeed a risk factor for cancer. Despite this being a good, competent, careful study involving over quarter of a million women, it still leaves room for doubt about the association, if there is one, between using powder in the genital area and ovarian cancer, there is still uncertainty about whether any such association exists. If it does exist, there is uncertainty about whether the powder itself is what causes any increase in cancer risk. And there's also uncertainty about what the size of the risk increase is, if it there is one.