This prospective observational study included 272 breast cancer patients who were candidates for adjuvant chemotherapy. Weight and body mass index were measured at baseline visit, then at 9 and 15 months from baseline (6 and 12-month post-chemotherapy). At baseline visit, information on the benefits of weight gain prevention and healthy diet was given by a dietician. Univariate logistic regression was performed to test the association between weight gain and potential predictive factors.
Thirty percent of patients gained weight during the year before diagnosis, 26 % were overweight and 15 % were obese. At one year, the mean weight change was +1.5 kg (SD = 4.1) and +2.3 % (SD = 6.0); 60 % of the cohort had gained weight, with a median increase of 3.9 kg (SD = 3.0) and 5.9 % (SD = 4.4). Reported weight gain during the year before diagnosis appears to be the only factor associated with the absence of post-chemotherapy weight gain (OR = 0.54, 95 % CI [0.31–0.95], p = 0.034).
Body weight increased in the post-chemotherapy period in French breast cancer survivors, even when given dietary recommendations. Appropriate weight management interventions with nutritional follow-up and physical activity programs are needed.