Pre-diagnosis body mass index and survival after breast cancer

Posted by Chantel M. Research contributed by the US National Library of Medicine National Institutes of Health

The prevalence of childbearing age obesity is wide spreading in US, approximately, 50% of them are either overweight [body mass index (BMI) 25-29.9 kg/m(2)] or obese (BMI ≥ 30 kg/m(2)).
Pre-diagnosis body mass index and survival after breast cancer
Obese and underweight women who develop breast cancer may have poorer survival compared with normal-weight women. According to the study by the Division of Research, Kaiser Permanente, posted in PubMed, after a mean follow-up of 7.8 years, 2,140 deaths and 2,065 recurrences were documented. Both underweight (HR = 1.59; 95% CI: 1.18, 2.13) and morbidly obese women (HR = 1.81; 95% CI: 1.42, 2.32) had the greatest risk of overall mortality compared with normal weight (18.5-24.9 kg/m(2)) women. Severe obesity (HR = 1.09; 95% CI: 0.88, 1.36) and obesity (HR = 1.11; 95% CI: 0.97, 1.27) were related to small non-significant increased risks. Overweight (25.0-29.9 kg/m(2)) was not associated with any excess risk compared with normal weight. Similar associations were found for breast cancer death and non-breast cancer death but not recurrence. Women who were underweight and morbidly obese before breast cancer diagnosis were at the greatest risk of all-cause mortality. Morbidly obese women were also at increased risk of death from breast cancer. These results suggest that degree of obesity confers differential risk on survival.
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