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    • Women with normal BMI...

    Women with normal BMI but high body fat at increased breast cancer risk

    Written by Anjali Nimesh Nimesh Published On 2018-02-19T19:15:59+05:30  |  Updated On 19 Feb 2018 7:15 PM IST
    Women with normal BMI but high body fat at increased breast cancer risk

    The data presented at the American Association for Cancer Research Special Conference Obesity and Cancer by researchers has revealed that among postmenopausal women with normal body mass index (BMI) those with higher body fat levels had an increased risk for invasive breast cancer .


    "It was previously unknown whether individuals who have a normal BMI but increased body fat have an increased risk of developing cancer," said Neil Iyengar, MD, medical oncologist at Memorial Sloan Kettering Cancer Center. "Our findings show that the risk of invasive breast cancer is increased in postmenopausal women with normal BMI and higher levels of body fat, meaning that a large proportion of the population has an unrecognized risk of developing cancer."


    "Body fat levels are typically measured via BMI, which is a ratio of weight to height. While BMI may be a convenient method to estimate body fat, it is not an exact way to determine whole body fat levels, as muscle mass and bone density cannot be distinguished from fat mass," said Thomas Rohan, MBBS, PhD, DHSc, professor and chair, Department of Epidemiology and Population Health at Albert Einstein College of Medicine. Dual energy X-ray absorptiometry (DXA) is a technology that can specifically measure for fat content, resulting in a more accurate assessment of total body fat levels, he explained.


    The investigators analyzed data from the Women's Health Initiative (WHI), an observational study that follows the health of postmenopausal women ages 50-79. The study included participants who had a normal BMI (between 18.5 to <25.0) with baseline DXA measurements and no history of breast cancer.


    During the median 16 years of follow-up, study participants were assessed for the development of invasive breast cancer, and cancer cases were evaluated for estrogen receptor (ER) positivity. Of the 3,460 participants in the study, 182 developed invasive breast cancer during follow-up; 146 of these cases were ER-positive.


    In multivariable analysis, compared to women in the lowest quartile of whole body fat mass, women in the highest quartile had approximately a doubling in the risk for ER-positive breast cancer.


    Iyengar and colleagues also found that the risk of ER-positive breast cancer increased by 35 percent for each 5-kilogram increase in whole body fat, despite having a normal BMI. "It is also notable that the level of physical activity was lower in women with higher amounts of body fat," said Iyengar. "This suggests that physical activity may be important even for those who are not obese or overweight."


    "These findings will probably be surprising to many doctors and patients alike, as BMI is the current standard method to assess the risks for diseases related to body weight," said Andrew Dannenberg, MD, associate director of Cancer Prevention at the Sandra and Edward Meyer Cancer Center of Weill Cornell Medicine. "We hope that our findings will alert women to the possibility of increased breast cancer risk related to body fat, even if they have a healthy weight."


    A limitation to the study is that the researchers were unable to analyze how changes in body fat over time related to breast cancer risk. The authors noted that findings from this study are limited to postmenopausal women and are not generalizable to other populations or other cancers.

    BMIbreast cancerMDMemorial Sloan Kettering Cancer Center
    Source : Eureka Alert

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    Anjali Nimesh Nimesh
    Anjali Nimesh Nimesh
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