By Trevor Stokes, Reuters Women finding fertility solutions can be reassured that in vitro fertilization (IVF) does not increase their danger of breast and gynecological cancers, according to a U.S. study of Israeli women. "The results were rather reassuring. Nothing was dramatically elevated," said lead author Louise Brinton, chief of the Hormonal and Reproductive Epidemiology Branch at the National Cancer Institute in Rockville, Maryland. Ovulation-stimulating medications or puncturing of the ovaries to get eggs could be part of IVF treatments, processes that researchers have thought may increase women's danger of cancer. Indeed, previous studies did link IVF early in life to heightened risks of breast cancer and borderline ovarian tumors. But other studies have discovered little association between fertility treatments and cancer. Because it is difficult to understand whether unmeasured factors maybe not recognized to IVF may influence the chance of cancer in women who have difficulty conceiving the relationship has been difficult to untangle, authorities say, in part. In addition, up to now there haven't been a lot of women who developed cancer after fertility treatment included in reports. "We all want answers, but it is just a very hard exposure we don't have the figures we'd actually like," Brinton, whose effects appeared in the journal Fertility & Sterility to study, particularly, told Reuters Health. Her colleagues and she examined the medical documents of 67,608 women who underwent IVF treatments between 2011 and 1994 and 19,795 women who sought treatment but never received IVF. The researchers connected these records to a cancer registry and found 1,509 of these have been clinically determined to have cancer through mid-2011. There is no difference in women's odds of being diagnosed with breast or endometrial cancer predicated on whether they were treated with IVF. The scientists did find that a woman's risk of ovarian cancer slightly increased the more models of therapy she received, but that finding might have been because of chance. Brinton said her study was too small effectively link IVF and ovarian cancer -- and that it remained very rare, with 45 cases in the complete study. A similar association was found in research headed by Bengt Kallen, director of the Tornblad Institute at Lund University, Sweden, who stated that any improved ovarian cancer risk might be because of the dysfunctional ovaries themselves. "Infertile women have a primary issue with their ovaries and IVF has nothing to complete with it," Kallen told Reuters Health. "It is just a somewhat hard thing to disentangle when there is a result from the hormones or from the IVF procedure." The others warned of biases that may make the outcomes of studies like this difficult to understand, nothing that ladies undergoing IVF are watched very carefully, which will likely increase the possibility that ovarian cancers are discovered. "You need to be extremely careful concerning this kind of a said Sherman Silber of the Infertility Center of St. Louis. "If anything. It's good. Any real increase doesn't be seen by one in cancer." Associated stories:
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