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SUNDAY, Nov. 2 (HealthDay News) -- Obesity can wreck a person's health for many reasons. But for women, too much weight tacks on an additional danger: Studies have linked obesity and breast cancer in a variety of ways.
Doctors aren't sure why this link exists and are trying to figure out what ties weight gain to breast cancer. But they are more and more convinced the link is there, and they are urging women to watch their weight and increase their exercise to help stave off what is the most common cancer among females, nonmelanoma skin cancer aside.
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"There are a lot of factors we need to figure out," said Dr. Jennifer A. Ligibel, of the Dana-Farber Cancer Institute in Boston. "There are a lot of things we don't know."
An estimated 182,500 women in the United States will be found to have invasive breast cancer in 2008, according to the American Cancer Society, and about 40,480 women will die from the disease this year. Currently, there are about 2.5 million breast cancer survivors in the United States.
Studies have found that, in general, obesity is linked to cancer. The higher a person's body-mass index (BMI, a ratio of weight to height), the more likely she or he will develop cancer, according to recent research by scientists at the University of Manchester in England. Other studies have found similar links to increased body fat.
Still other studies have found that women with breast cancer are more likely to live shorter lives and suffer a recurrence of their cancer if they are overweight.
For example, in a recent study conducted at the University of Texas M.D. Anderson Cancer Center in Houston, more than two-thirds of women with stage III locally advanced breast cancer were either overweight or obese. The study also found that a greater proportion of obese patients were likely to be diagnosed with a rare and more deadly form of breast cancer, known as inflammatory breast cancer.
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