ESR1 and ductal breast carcinoma in situ: BMI: body mass index; ER: estrogen receptor; PR: progesterone receptor; HER2: human epidermal growth factor receptor 2; DCIS: ductal carcinoma in situ; DIEP: deep inferior epigastric perforator; ADM: acellular dermal matrix; GBP: gastric bypass; NAFLD: non-alcoholic fatty liver disease; SOS: sinusoidal obstruction syndrome.