Breast cancer survivors with a family history of the disease are more likely to gain weight than similar women without cancer, a new study published Tuesday found. Even further, there appears to be a link between treatment and weight gain. While there has long been a connection between weight gain and women who survive breast cancer, researchers have been unable to discern whether or not that was caused by the disease. The Cancer Epidemiology, Biomarkers & Prevention study found that even after adjusting for age, menopause and other factors, women who survived breast cancer gained on average almost four pounds more within five years of their diagnosis compared with those who didn't have cancer. Among these patients, those who were treated with chemotherapy were twice as likely to gain weight.