0301 basic medicine Oncology Cancer Research medicine.medical_specialty Carcinogenesis MEDLINE Breast Neoplasms Body Mass Index 03 medical and health sciences 0302 clinical medicine Breast cancer Risk Factors Internal medicine medicine Prevalence Tumor Microenvironment Humans Obesity Tumor microenvironment business.industry Incidence (epidemiology) Incidence Estrogens General Medicine medicine.disease 030104 developmental biology 030220 oncology & carcinogenesis Female business Body mass index