{"id":42902,"date":"2018-08-24T16:37:32","date_gmt":"2018-08-24T15:37:32","guid":{"rendered":"https:\/\/blogs.bmj.com\/bmj\/?p=42902"},"modified":"2018-08-31T13:59:01","modified_gmt":"2018-08-31T12:59:01","slug":"jeffrey-aronson-when-i-use-a-word-non-diseases","status":"publish","type":"post","link":"https:\/\/blogs.bmj.com\/bmj\/2018\/08\/24\/jeffrey-aronson-when-i-use-a-word-non-diseases\/","title":{"rendered":"Jeffrey Aronson: When I use a word . . . Non-diseases"},"content":{"rendered":"

What makes a good definition? There are five guidelines:<\/span><\/p>\n

\u2022 A good definition describes all the essential attributes of the definiendum, the thing being defined. To define something (Latin definire) is to determine its boundaries (Latin fines), and hence to state exactly what the thing is or to set forth or explain its essential nature; this is what Aristotle called \u03c4\u1f79 \u03c4\u1f77 \u1f26\u03bd \u03b5\u1f36\u03bd\u03b1\u03b9 (literally, that which is). Thus, a definition is \u201ca precise statement of the essential nature of a thing\u201d (<\/span>Oxford English Dictionary<\/i>).<\/span><\/p>\n

\u2022 It must not be too wide or too narrow. As its etymology implies, a boundary must be drawn round a definition so that it includes everything essential and excludes everything inessential.<\/span><\/p>\n

\u2022 It should avoid circularity. <\/span>For example<\/a>, to define a medication error as \u201cany error occurring in the medication process\u201d is circular, since what it says, in effect, is that a medication error is an error in medication.<\/span><\/p>\n

\u2022 It must not be obscure. The words used in a definition must themselves be easily understood without further definition. When defining technical terms it may be hard to comply with this.<\/span><\/p>\n

\u2022 It should, if possible, be positive not negative. One should not, for example, define \u201cwisdom\u201d as \u201cthe absence of folly\u201d; after all, there are many other things one could put in place of \u201cfolly\u201d here. Negative definition also encourages circular definition; having defined \u201cwisdom\u201d as \u201cthe absence of folly, one might, for example, define \u201cfolly\u201d as \u201cthe absence of wisdom\u201d.<\/span><\/p>\n

Occasionally, the last of these guidelines may be legitimately ignored. For example, when two categories can be clearly distinguished and carefully defined, one of them can reasonably be described as the negation of the other. Examples include invasive and non-invasive treatments, coding and non-coding RNA, obese and non-obese individuals, and communicable and non-communicable diseases.<\/span><\/p>\n

In some cases specific diseases can be similarly labelled. For instance, when only two viruses that caused viral hepatitis had been identified, hepatitis A and hepatitis B, other cases of viral hepatitis, in the absence of evidence of a causative agent, were called <\/span>non-A non-B hepatitis<\/span><\/a>, recognizing that other unknown viruses might be responsible. Later, in the 1970s, when other viruses were identified they were called hepatitis C, hepatitis D, and so on. Since then the term \u201dnon-A non-B\u201d has gradually fallen out of use (Figure 1).<\/span><\/p>\n

\"Numbers
Figure 1. Numbers of papers containing the term \u201cnon-A non-B [hepatitis]\u201d since its first appearance in 1975 (source Pubmed)<\/figcaption><\/figure>Non-alcoholic fatty liver disease (Figure 2), which can progress to fibrosis and cirrhosis, contrasts with the alcoholic variety. However, it is a <\/span>heterogeneous group of disorders<\/span><\/a>. For example, non-alcoholic steatohepatitis (NASH) is a recognized variant, with a worse prognosis than other forms of non-alcoholic fatty liver disease. Furthermore, there are different genetic variants, with different disease associations, including <\/span>polymorphisms<\/span><\/a> in the Patatin-like phospholipase domain-containing 3 (PNPLA3) gene and the transmembrane 6 superfamily member 2 (TM6SF2) gene. As long as the different variants have not been fully described, the description \u201cnon-alcoholic\u201d can be justified, but as we learn more and more about them, the more desirable it becomes to start naming the individual types distinctively.<\/span><\/p>\n
\"Non-alcoholic
Figure 2. Non-alcoholic fatty liver disease<\/figcaption><\/figure>\n

Likewise, non-small cell lung cancer contrasts with the small cell variety (Figure 3). The former is considerably more common than the latter and is heterogeneous, encompassing adenocarcinomas, squamous cell carcinomas, and large cell carcinomas. Furthermore, non-small cell carcinomas have <\/span>polymorphisms<\/span><\/a> in genes such as the anaplastic lymphoma kinase (ALK) gene, which may predict <\/span>responsiveness to specific agents<\/span><\/a>, such as crizotinib and ceritinib, in small numbers of individuals.<\/span><\/p>\n

\"A
Figure 3. A non-small cell lung cancer (left) and a small-cell lung cancer (right)<\/figcaption><\/figure>\n

Other examples of heterogeneous conditions negatively defined include non-valvular atrial fibrillation, non-neural granular cell tumours, and non-Hodgkin\u2019s lymphoma.<\/span><\/p>\n

Negative definitions of heterogeneous groups of diseases are useful insofar as they hide ignorance and make no assumptions about their pathologies, but they should be replaced by definitive descriptions when their heterogeneity is understood.<\/span><\/p>\n

\"\"Jeffrey Aronson<\/strong>\u00a0is a clinical pharmacologist, working in the Centre for Evidence Based Medicine in Oxford’s Nuffield Department of Primary Care Health Sciences. He is also president emeritus of the British Pharmacological Society.<\/em><\/p>\n

Competing interests:<\/strong>\u00a0None declared.<\/p>\n","protected":false},"excerpt":{"rendered":"

What makes a good definition? There are five guidelines: \u2022 A good definition describes all the essential attributes of the definiendum, the thing being defined. To define something (Latin definire) […]<\/p>\n

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