LONDON — Genes that make women more susceptible to breast cancer don't have any link to lifestyle factors that also raise their risk, a new study says. Some experts previously thought there might be dangerous interactions between breast cancer mutations and other risk factors for the disease, like taking hormone replacement therapy – and that these women had a particularly high risk of breast cancer. According to a study published Wednesday in the medical journal, Lancet, that isn't the case. British researchers studied 7,610 women with breast cancer and 10,196 women without it.