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Adjuvant Treatment and Onset of Menopause Predict Weight Gain After Breast Cancer Diagnosis

From the Department of Medicine, Division of Clinical Epidemiology, Samuel Lunenfeld Research Institute; Mount Sinai Hospital; Division of Medical Oncology, Department of Surgery, Toronto-Sunnybrook Regional Cancer Centre; Princess Margaret Hospital; Women's College Hospital; St. Michael's Hospital; Clinical Epidemiology and Health Care Research Program; and University of Toronto, Toronto, Ontario, Canada.

Address reprint requests to Pamela Goodwin, MD, Mount Sinai Hospital, 1284-600 University Ave, Toronto, Ontario M5G 1X5, Canada.

PURPOSE: Weight gain is common during the first year after breast cancer diagnosis. In this study, we examined clinical factors associated with body size at diagnosis and weight gain during the subsequent year.

PATIENTS AND METHODS: An inception cohort of 535 women with newly diagnosed locoregional breast cancer underwent anthropometric measurements at baseline and 1 year. Information was collected on tumor- and treatment-related variables, as well as diet and physical activity.

RESULTS: Mean age was 50.3 years; 57% of women were premenopausal. Mean baseline body mass index (weight [kg] divided by height [m] squared) was 25.5 kg/m². Overall, 84.1% of the patients gained weight. Mean weight gain was 1.6 kg (95% confidence interval, 1.2 to 1.9 kg), 2.5 kg (95% confidence interval, 1.8 to 3.2 kg) in those receiving chemotherapy, 1.3 kg (95% confidence interval, 0.7 to 1.8 kg) in those receiving tamoxifen only, and 0.6 kg (95% confidence interval, 0.01 to 1.3 kg) in those receiving no adjuvant treatment. Menopausal status at diagnosis (P = .02), change in menopausal status over the subsequent year (P = .002), axillary nodal status (P = .009), and adjuvant treatment (P = .0002) predicted weight gain in univariate analysis. In multivariate analysis, onset of menopause and administration of chemotherapy were independent predictors of weight gain (all P .05). Caloric intake decreased (P < .01) and physical activity increased (P < .05) during the year after diagnosis; these factors did not explain the observed weight gain.

CONCLUSION: Weight gain is common after breast cancer diagnosis; use of adjuvant chemotherapy and onset of menopause are the strongest clinical predictors of this weight gain.

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