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The overdiagnosis of what? On the relationship between the concepts of overdiagnosis, disease, and diagnosis

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Abstract

Overdiagnosis and disease are related concepts. Widened conceptions of disease increase overdiagnosis and vice versa. This is partly because there is a close and complex relationship between disease and overdiagnosis. In order to address the problems with overdiagnosis, we may benefit from a closer understanding this relationship. Accordingly, the objective of this article is to elucidate the relationship between disease and overdiagnosis. To do so, the article starts with scrutinizing how overdiagnosis can explain the expansion of the concept of disease. Then it investigates how definitions of disease address various challenges of overdiagnosis. The article specifically investigates recent attempts to clarify the relationship between the concepts of disease and overdiagnosis. Several shortcomings are identified and lead to a closer analysis of overdiagnosis in the diagnostic process. Contrary to recent contributions to the field, it is argued that cases of overdiagnosis are not cases of disease. They are non-verified labelling of disease. It is revealed how overdiagnosis establishes an unwarranted link between indicative phenomena, such as polyps or cell changes, and harm, and thereby generates a link to disease. One implication of this study is that we should stop attributing disease language to indicative phenomena. That is, we should stop calling it “cancer screening” when we are actually searching for polyps. Another implications is that we should strive for scientific progress in differentiating phenomena that are of negative value to us from those that are not. In overdiagnosis we diagnose something that is not disease: it is over-diagnosis.

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Notes

  1. Please note that this is not a comment on the inconsistency of the authors’ claim that overdiagnosis is both “harmless disease” and that it is harmful at the same time (Walker and Rogers 2016, Epub ahead of print). I think that Walker and Rogers will argue that the harm referred to in the definition of overdiagnosis is different from the harm resulting from (the events of) overdiagnosis. The first harm is pathogenic while the latter is iatrogenic and does not stem from the “diagnosed condition.” That is, there are several types of harm from diagnosis and disease, and only the iatrogenic harm is relevant for overdiagnosis.

  2. Although Carter et al. indicate that professionals do not reject realist conceptions of disease (Carter et al. 2016b), they are unclear on this. Altogether, the reference to the professional community is quite vague.

  3. Carter et al. are not clear on the distinction between disease and diagnosis. I will therefore address both and try to clarify the relationship below.

  4. This does not mean that classically structured concepts cannot have definiens that are vague. Here the point is that normativistic conceptions of disease refer to norms and values of some kind, and frequently refer to harm.

  5. There is also another circularity in the “précising definition,” as disease is defined in terms of a person already considered to be a patient, i.e., as “physiological dysfunction that has a significant risk of causing severe harm to the patient” (my emphasis). Although this may be a result of linguistic imprecision, it indicates the problem with this alternative conception of disease in order to clarify overdiagnosis: it lacks a clear concept of disease.

  6. As will be argued later, the qualifier “malignant changes” presupposes what is to be shown, i.e., that it is a disease.

  7. Walker and Roger also include non-harmful conditions in their conception of diagnosis. In fact they include it even in their definitions of disease, both in “diseaseODx” and in “disease (simpliciter).” Addressing this issue is beyond the scope of this article.

  8. This is what Walker and Rogers call “non-harmful disease,” but, as will be explained below, is not disease at all.

  9. Just to be clear, this does not mean that death always is undesirable.

  10. One of the reasons for this was that experiences, observable phenomena, and altered behaviors and social roles were quite immediate (i.e., late detection).

  11. I owe this argument to one of the reviewers.

  12. I owe this argument to one of the reviewers.

  13. I owe this argument to one of the reviewers.

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Acknowledgements

I am most thankful for wise comments and suggestions by two anonymous reviwers.

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This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.

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Correspondence to Bjørn Hofmann.

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Hofmann, B. The overdiagnosis of what? On the relationship between the concepts of overdiagnosis, disease, and diagnosis. Med Health Care and Philos 20, 453–464 (2017). https://doi.org/10.1007/s11019-017-9776-z

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