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The current investigation, reported in the Journal of Clinical Oncology, involved 1169 patients who were treated at the researchers' center from May 1990 to July 2004. Standard body mass criteria were used to divide patients into obese, overweight, and normal/underweight groups. This included body mass index (BMI) – the ratio of height to weight, often used to classify people into weight categories.
Compared to normal-weight patients, those in the overweight and the combination of overweight and obesity categories had a reduced likelihood of a complete response with chemotherapy response.
Although obese patients were as likely as normal-weight patients to have a complete chemotherapy response, they were at greater risk for hormone-negative, stage III tumors and had worse overall survival over a follow-up period of 4.1 years.
The link between a higher body mass index BMI and a reduced chemotherapy response, the authors note, "may be attributed to the influence of body mass index on the clinical effectiveness of chemotherapy or the underdosing of overweight and obese patients by clinicians because of fears of toxicity, despite randomized studies that have demonstrated that this practice contributes to worse disease-free survival."

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