Nguyen Van Hung Place of Education: Hanoi Medical University New findings in medical doctor thesis: Classification of breast diseases by cytology learning The 5-stage classification system is endorsed and popularized by the Britains National Health Service Breast Screening Programme (NHSBSP), the National Cancer Institute (NCI) of the USA and The Royal College of Pathologist of Australasia (RCPA) with cell morphological standards in the diagnosis of cytology of cytology of breast diseases, especially breast cancer.