The nomenclature of cell death: Recommendations of an ad hoc Committee of the Society of Toxicologic Pathologists

The last several years have seen considerable confusion regarding the terms "apoptosis" and "necrosis" in pathology. This situation prompted the Socie ty of Toxicologic Pathologists to charter the Committee on the Nomenclature of Cell Death, which was charged with making recommendations about the use of the terms "apoptosis" and "necrosis" in toxicity studies. The Committee recommends use of the term "necrosis" to describe findings comprising dead cells in histological sections, regardless of the pathway by which the cel ls died. The modifiers "apoptotic" and "oncotic" or "mixed apoptotic and on cotic" are recommended to specify the predominant morphological cell death pathway or pathways, when appropriate. Other standard modifiers, indicating the lesion distribution and severity, may also be used in conjunction with these. "lndividual cell necrosis" (also known as "single cell necrosis") m ay be either of the apoptotic, oncotic, or mixed types. In many cases, more traditional terms such as "coagulation necrosis" may be used to convey a m eaning similar to oncotic necrosis. It is important that pathologists use t erms that accurately and concisely convey the level of information appropri ate to the study's needs. Furthermore, toxicologic pathologists should acti vely help to disseminate these recommendations to other biologists and to r egulatory authorities.