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Ovary removal may increase lung cancer risk
July 22, 2009Women who have premature menopause because of medical interventions are at an increased risk of developing lung cancer, according to a new study published in the International Journal of Cancer. The startling link was made by epidemiologists from the Université de Montréal, the Research Centre of the Centre Hospitalier de l'Université de Montréal and the INRS-Institut Armand-Frappier.
"We found that women who experienced non-natural menopause are at almost twice the risk of developing lung cancer compared to women who experienced natural menopause," says Anita Koushik, a researcher at the Université de Montréal's Department of Social and Preventive Medicine and a scientist at the Research Centre of the Centre Hospitalier de l'Université de Montréal. "This increased risk of lung cancer was particularly observed among women who had non-natural menopause by having had both their ovaries surgically removed."
The scientists studied 422 women with lung cancer and 577 control subjects at 18 hospitals across Montreal, Quebec, Canada. They assessed socio-demographic characteristics, residential history, occupational exposures, medical and smoking history, and (among women) menstruation and pregnancy histories.
"A major strength of this study was the detailed smoking information which we obtained from all study participants; this is important because of the role of smoking in lung cancer and because smokers generally have lower estrogen levels than non-smokers," says Dr. Koushik. "Although smoking is the dominant cause of lung cancer, we know other factors can play an important role in enhancing the impact of tobacco carcinogens; this research suggests that in women hormonal factors may play such a role."
Women were considered menopausal if their menstrual periods had stopped naturally, surgically (by hysterectomy with bilateral surgical ovary removal) or because of radiation or chemotherapy. Women who had at least one remaining ovary and who still had their menstrual periods at the time of diagnosis/interview were classified as premenopausal. Among participants with natural menopause, the median age for attaining menopause was 50 years old; among those with non-natural menopause, it was at 43 years.
"Non-natural menopause, particularly surgical menopause, may represent an increased risk with younger age at menopause given that surgery is usually done before natural menopause occurs. It's possible that vulnerability to lung cancer is caused by early and sudden decrease in estrogen levels or potentially long-term use of hormone replacement therapy and further research is needed to explore these hypotheses," says Jack Siemiatycki a professor at the Université de Montréal's Department of Social and Preventive Medicine and a scientist at the Research Centre of the Centre Hospitalier de l'Université de Montréal.
University of Montreal
"A major strength of this study was the detailed smoking information which we obtained from all study participants; this is important because of the role of smoking in lung cancer and because smokers generally have lower estrogen levels than non-smokers," says Dr. Koushik. "Although smoking is the dominant cause of lung cancer, we know other factors can play an important role in enhancing the impact of tobacco carcinogens; this research suggests that in women hormonal factors may play such a role."
Women were considered menopausal if their menstrual periods had stopped naturally, surgically (by hysterectomy with bilateral surgical ovary removal) or because of radiation or chemotherapy. Women who had at least one remaining ovary and who still had their menstrual periods at the time of diagnosis/interview were classified as premenopausal. Among participants with natural menopause, the median age for attaining menopause was 50 years old; among those with non-natural menopause, it was at 43 years.
"Non-natural menopause, particularly surgical menopause, may represent an increased risk with younger age at menopause given that surgery is usually done before natural menopause occurs. It's possible that vulnerability to lung cancer is caused by early and sudden decrease in estrogen levels or potentially long-term use of hormone replacement therapy and further research is needed to explore these hypotheses," says Jack Siemiatycki a professor at the Université de Montréal's Department of Social and Preventive Medicine and a scientist at the Research Centre of the Centre Hospitalier de l'Université de Montréal.
University of Montreal
Menopause Current Events and Menopause News RSSFertility procedures need not delay breast cancer treatment for younger women
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Estrogen therapy likely must be given soon after menopause to provide stroke protection
For estrogen replacement to provide stroke protection, it likely must be given soon after levels drop because of menopause or surgical removal of the ovaries, scientists report in the Journal of Neuroscience.
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Hormone mix could cut breast cancer risk and treat symptoms of menopause
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Novel, soy-based SE5-OH containing Natural S-equol supplement reduced hot flash frequency by nearly 59 percent
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Pelvic floor muscle exercises can help manage urinary incontinence in older women
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Researchers believe hormone therapy should not be stopped prior to mammograms
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Penn studies point to strategies for reducing painful breast cancer drug side effects
Aromatase inhibitors, the same drugs that have buoyed long-term survival rates among breast cancer patients, also carry side effects including joint pain so severe that many patients discontinue these lifesaving medicines.
Experimental approach may reverse rheumatoid arthritis and osteoporosis
Researchers have identified a mechanism that may keep a well known signaling molecule from eroding bone and inflaming joints, according to an early study published online today in the Journal of Clinical Investigation.
Postmenopausal women benefit from endurance training as much as younger women
Marilyn Graham was 56 when she signed up for a grueling hour of cycling each morning for 12 weeks, occasionally decked out in a mask, a heart monitor and a bag of intravenous fluid and subjected to needle pricks to obtain blood samples.
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