Test of weight gain prevention intervention in stage II and III breast cancer patients receiving neoadjuvant chemotherapy

e20523 Background: Weight gain is common in women with breast cancer and is worrisome, as may affect prognosis and risk of other chronic diseases. This randomized study pilot tested a weight gain prevention intervention for breast cancer patients receiving neoadjuvant chemotherapy. Methods: Breast cancer patients receiving neoadjuvant chemotherapy were randomized to a weight gain prevention intervention or a usual care control arm. The intervention used a body acceptance approach, which emphasized changes in diet (low energy density food) and exercise behavior (resistance training) rather than focusing on weight loss. It was administered in weekly sessions delivered in-person and by telephone. Assessments were done at baseline, mid-chemotherapy, pre-surgery, after surgical recovery, after a 9 week post-surgical booster intervention, and 6 months after surgery. The data on weight changes from baseline (T0) to mid-chemotherapy (T1) and presurgery (T2) is presented. Results: 33 participants were randomized the intervention (n=16) or usual care (n=17). Three control participants withdrew before assessments were done. Of the 30 remaining women, 70% had stage II and 30% had stage III breast cancer. Their mean age was 49.7 (SD=12.2), and half were premenopausal. Mean BMI was 29.3 (SD=6.1) and 70% were physically inactive. The sample was diverse with regard to self-reported ethnicity (57% white, 27% African-American, 7% Hispanic, 10% other). Change in weight from T0 to T1 was -0.9 kg in the intervention group and +1.4 kg in the usual care group (n=27, p=0.126); from T0 to T2 the change was -2.0 kg in the intervention group and +0.8 kg in the usual care group (n=20, p=0.056). When weights from a chart review were used for patients with missing assessments the T0 to T2 changes were -2.9 kg for the intervention group and 0 kg for the usual care group (n=30, p=0.065). Conclusions: Based on a preliminary analysis, there was a trend approaching statistical significance for weight loss from a diet and exercise intervention based on the body acceptance approach compared to a usual care control group. These results indicate this intervention should be tested in a larger randomized controlled trial. No significant financial relationships to disclose.