Bloom-Richardson grade
Encyclopedia
The Bloom–Richardson grading system from 1957 refers to a breast cancer classification
Breast cancer classification
Breast cancer classification divides breast cancer into several categories according to multiple different schemes, each based on different criteria and serving a different purpose. A typical description usually considers each of these aspects in turn: the histolopathological type, the grade of the...

  system to grade breast cancers, and was the precursor of the present criteria, the modified Bloom–Richardson–Elston grading system (also called the Nottingham system.) The cells and tissue structure of the breast cancer are examined histopathologically
Histopathology
Histopathology refers to the microscopic examination of tissue in order to study the manifestations of disease...

 to determine how aggressive the cancer is. Lower grade tumors, with a good prognosis, can be treated less aggressively, and have a better survival rate. Higher grade tumors are treated more aggressively, and their intrinsically worse survival rate may warrant the adverse effects of more aggressive medications. The references highlight the historical and current criteria; the latter system is judged more reproducible and is the recommended grading method. The breast cancer classification
Breast cancer classification
Breast cancer classification divides breast cancer into several categories according to multiple different schemes, each based on different criteria and serving a different purpose. A typical description usually considers each of these aspects in turn: the histolopathological type, the grade of the...

 article has further details of current breast cancer grading criteria.
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