Thyroid and Breast Deptartment III;
Cangzhou Central Hospital;
Cangzhou 061001;
Hebei Province;
China;
Department of Radiology;
North China University of Science and Technology Affiliated Hospital;
Tangshan 063000;
Hebei Province;
China;
Department of Second Ultrasound;
Cangzhou Central Hospital;
Cangzhou 061001;
Hebei Province;
China;
Breast cancer; Hypoxia-inducible factor-2α; Cancer stem cells; CD44;