Fertility treatment does not increase a woman's risk of developing breast cancer, according to a study of more than 25,000 women with fertility problems in the Netherlands.
The study will help to reassure patients concerned that the powerful doses of hormones that are part of fertility treatment might put them at risk of developing cancer in the future.
At the beginning of an IVF treatment cycle, women are given a course of hormone drugs to stimulate their ovaries to produce more eggs than usual so that clinicians can produce several fertilised embryos in vitro.
The treatment causes large spikes in oestrogen levels in the body. In theory this could promote the development of breast cancer, which is sensitive to the hormone.
The Dutch study, carried out by Dr Alexandra van den Belt-Dousebout at the Netherlands Cancer Institute in Amsterdam, examined patient records from all 12 IVF clinics in the country between 1980 and 1995.
Her team compared 18,970 women who had had at least one cycle of IVF treatment and 7,536 other women with fertility problems who had not received fertility treatment. They matched these patients to records in the National Cancer Registry to establish whether they had gone on to develop breast cancer.
Of the 378 women who developed breast cancer, 266 were in the IVF group and 112 were in the non-IVF group. After adjusting for known risk factors such as age, the number of children the women already had, the age they began menstruating, family history of breast cancer and body mass index, the team found no statistical difference between the two groups, suggesting that IVF treatment does not increase a woman's chances of developing breast cancer.
Van den Belt-Dousebout presented her results at the American Society for Reproductive Medicine in San Francisco.
"From 10 years after treatment breast cancer risk was moderately increased in the IVF group but also in the non-IVF group, compared to the general population," van den Belt-Dousebout and her colleagues wrote in their presentation, "This may be explained by a lower number of children compared to the general population."
Having children is known to reduce the risk of breast cancer in women.
Tuesday, January 13, 2009
Monday, January 12, 2009
Oocyte electroactivation after ICSI
Electrical activation of oocytes after ICSI can significantly improve the fertilization rate in selected patients, according to the results of a randomized controlled study.
Specialists from the Egyptian IVF-ET Center in Cairo, Egypt, conducted the study to estimate the effect of electrical activation of oocytes in patients with previously failed or limited fertilization after ICSI, and in patients likely to have failed fertilization due to teratozoospermia.
Previous research has suggested that fertilization failure occurs in an estimated 2-3 percent of ICSI cycles and is often due to the failure of oocyte activation. Past studies have provided some evidence to suggest that electrical activation (or electroactivation) of oocytes can improve success rates.
The researchers studied the effect of electrical activation in 241 ICSI cycles involving couples with severe oligoasthenospermia or azoospermia. Poor or failed fertilization was expected in these cycles because of 100 percent abnormal sperm morphology or totally immotile sperm. In all cases the female partner was under 40 years of age and had a normal hormonal profile and no pelvic pathology.
The oocytes from each patient were randomly assigned on a one-to-one basis to either electroactivation (n = 1,640) or no electroactivation (n = 1,435). Electroactivation was performed 30 minutes after ICSI, using a double-square direct current pulse, and embryo transfer was performed with the best available embryos.
The researchers (Mansour R et al) present their findings in a new paper due to be published in the journal Fertility and Sterility. They report that:
The fertilization rate was significantly higher in the electroactivation group, compared with the control group: 68 percent versus 60 percent respectively (odds ratio 1.40; 95 percent confidence interval 1.20-1.63).
There was no significant difference between the two groups in the oocyte degeneration rate (5.9 percent in the electroactivation group and 4.9 percent in the control group).
There were a total of 112 clinical pregnancies in the study. In 15 of these, the embryos transferred were derived solely from the electroactivated group (out of a total of 34 embryo transfer procedures involving such embryos – a clinical pregnancy rate of 44 percent). In 69 of the clinical pregnancies the embryos transferred were derived solely from the control group (out of a total of 69 embryo transfer procedures involving such embryos – a clinical pregnancy rate of 48 percent). In the remaining 64, the embryos transferred were derived from both groups (out of a total of 138 embryo transfer procedures – a clinical pregnancy rate of 46.4 percent).
The miscarriage rates were: 20 percent (3 out of 15 clinical pregnancies) when the embryos transferred were derived solely from the electroactivated group, 9 per cent (3 out of 33 clinical pregnancies) when the embryos transferred were derived solely from the control group, and 9.4 percent (6 out of 64 clinical pregnancies) when the embryos transferred were derived from both groups.
Total fertilization failure did not occur in the study group, but occurred in five cycles in the control group.
Concluding, the researchers write that electroactivation of oocytes after ICSI can significantly improve the chances of fertilization, but stress: “However, more studies are needed to evaluate the clinical significance and safety of this technique.
“It is recommended in cases of previous failure of fertilization or limited fertilization, as well as in cases of severe oligoasthenospermia or azoospermia with 100 percent abnormal forms or zero motility.”
Source: Fertility and Sterility 2008;in press
Specialists from the Egyptian IVF-ET Center in Cairo, Egypt, conducted the study to estimate the effect of electrical activation of oocytes in patients with previously failed or limited fertilization after ICSI, and in patients likely to have failed fertilization due to teratozoospermia.
Previous research has suggested that fertilization failure occurs in an estimated 2-3 percent of ICSI cycles and is often due to the failure of oocyte activation. Past studies have provided some evidence to suggest that electrical activation (or electroactivation) of oocytes can improve success rates.
The researchers studied the effect of electrical activation in 241 ICSI cycles involving couples with severe oligoasthenospermia or azoospermia. Poor or failed fertilization was expected in these cycles because of 100 percent abnormal sperm morphology or totally immotile sperm. In all cases the female partner was under 40 years of age and had a normal hormonal profile and no pelvic pathology.
The oocytes from each patient were randomly assigned on a one-to-one basis to either electroactivation (n = 1,640) or no electroactivation (n = 1,435). Electroactivation was performed 30 minutes after ICSI, using a double-square direct current pulse, and embryo transfer was performed with the best available embryos.
The researchers (Mansour R et al) present their findings in a new paper due to be published in the journal Fertility and Sterility. They report that:
The fertilization rate was significantly higher in the electroactivation group, compared with the control group: 68 percent versus 60 percent respectively (odds ratio 1.40; 95 percent confidence interval 1.20-1.63).
There was no significant difference between the two groups in the oocyte degeneration rate (5.9 percent in the electroactivation group and 4.9 percent in the control group).
There were a total of 112 clinical pregnancies in the study. In 15 of these, the embryos transferred were derived solely from the electroactivated group (out of a total of 34 embryo transfer procedures involving such embryos – a clinical pregnancy rate of 44 percent). In 69 of the clinical pregnancies the embryos transferred were derived solely from the control group (out of a total of 69 embryo transfer procedures involving such embryos – a clinical pregnancy rate of 48 percent). In the remaining 64, the embryos transferred were derived from both groups (out of a total of 138 embryo transfer procedures – a clinical pregnancy rate of 46.4 percent).
The miscarriage rates were: 20 percent (3 out of 15 clinical pregnancies) when the embryos transferred were derived solely from the electroactivated group, 9 per cent (3 out of 33 clinical pregnancies) when the embryos transferred were derived solely from the control group, and 9.4 percent (6 out of 64 clinical pregnancies) when the embryos transferred were derived from both groups.
Total fertilization failure did not occur in the study group, but occurred in five cycles in the control group.
Concluding, the researchers write that electroactivation of oocytes after ICSI can significantly improve the chances of fertilization, but stress: “However, more studies are needed to evaluate the clinical significance and safety of this technique.
“It is recommended in cases of previous failure of fertilization or limited fertilization, as well as in cases of severe oligoasthenospermia or azoospermia with 100 percent abnormal forms or zero motility.”
Source: Fertility and Sterility 2008;in press
Sunday, January 11, 2009
Saturday, January 10, 2009
Friday, January 9, 2009
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