STAFF REPORTER
An international study has revealed that injectable contraceptives temporarily increase the risk of breast and cervical cancer.
The study built on previous research that found women who used oral contraception had a temporarily increased risk of breast cancer and cervical cancer and a decreased risk of ovarian cancer and cancer of the lining of the womb.
The study was led by?Emily Banks of The Australian National University and?Margaret Urban at the National Health Laboratory Service in Johannesburg.
?Our study confirms previous findings that the use of oral hormonal contraceptives is associated with an increased risk of breast and cervical cancer,? Professor Banks said.
?We have also shown for the first time that injectable hormonal contraception use independently increases the risk of developing these cancers to a similar extent as oral contraceptives, and that these risks wear off over time.?
The researchers found that South African women who had recently used one or both these contraception methods were about 1.7 times more likely to develop breast cancer and 1.4 times more likely to develop cervical cancer than women who had never used hormonal contraception.
However, this increased risk disappeared within a few years after women stopped taking the contraception.
The study also supports previous findings that extended use of hormonal contraception is associated with a reduced risk of ovarian cancer and cancer of the lining of the womb.
?Over 60 million women are using injectable contraceptives world wide,? Ms Urban said.
?These findings fill an important gap in knowledge, which will inform women?s contraception choices.
?The temporary increase in the risk of breast and cervical cancer and the long-term protection against ovarian and endometrial cancers need to be considered alongside the highly effective contraception that these medications provide.?
The study, involving more than 3500 black women, was run at Johannesburg public hospitals.
Among black South African women, injectable contraceptives are used more commonly than the oral contraceptive pill.
Oral contraceptive pills contain man-made versions of the female sex hormones oestrogen and progesterone.
Injectable contraceptives usually only contain progesterone.
Source: http://www.oneperth.com.au/2012/03/07/contraceptive-cancer-risk-revealed/
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