In pathology, Grading is a measure of the progress of tumors. Pathology (in ancient Greek pathos = feeling, pain, suffering and logos = discourse or treatise, i. ... See the article about cancer for the main article about malignant tumors. ...
Cancer is a disorder of cell growth, and cancerous cells often lack differentiation, resembling primitive cell types. An important part of evaluating a cancer is to determine its histologic grade. Grade is a marker of how differentiated a cell is. Grade is rated numerically (Grade 1-4) or descriptively (e.g., "high grade" or "low grade"). The higher the numeric grade, the more "poorly differentiated" is the cell, and it is called "high grade". A low grade cancer has a low number and is "well-differentiated." Grade is most commonly given on a three-tier scale. A cancer that is very poorly differentiated is called anaplastic. Tumors may be graded on four-tier, three-tier, or two-tier scales, depending on the institution and the tumor type. A three-tier scale is most commonly used. When normal cells are damaged or old they undergo apoptosis; cancer cells, however, avoid apoptosis. ... A thin section of lung tissue stained with hematoxylin and eosin. ... A grade may refer to many different concepts, including: in various contexts: Each item in a (generally ordered and finite) collection of symbols or designators used as a particular grade system to distinguish and rank corresponding groups, where distinct members or instances of each group are regarded as sufficiently similar... Categories: Move to Wiktionary | Stub ...
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