Original articlesThe Omnipresence of Cancer Two PerspectivesZumstein-Shaha, Maya PhD, RN; Lynn Cox, Carol PhD, RN, FHEA; Fawcett, Jacqueline PhD, ScD (Hon), RN, FAAN, ANEFAuthor Information Department of Health Professions, Division of Nursing, Bern University of Applied Sciences, Bern, Switzerland (Dr Zumstein-Shaha); Department of Health Sciences, City, University of London, London, England (Dr Cox); and Department of Nursing, University of Massachusetts Boston (Dr Fawcett). Correspondence: Maya Zumstein-Shaha, PhD, RN, Department of Health Professions, Division of Nursing, Bern University of Applied Sciences, Murtenstrasse 10, 3008 Bern, Switzerland (firstname.lastname@example.org). The authors have disclosed that they have no significant relationships with, or financial interest in, any commercial companies pertaining to this article. Advances in Nursing Science: July/September 2020 - Volume 43 - Issue 3 - p E113-E130 doi: 10.1097/ANS.0000000000000314 Buy Metrics Abstract This article aimed at describing the development of a theory of the experience of living with cancer. Secondary analysis of data from a series of studies yielded the concepts and propositions of the theory of the omnipresence of cancer. Theory construction was guided by Heidegger's ontology of dasein, whereas Newman's grand theory of health as expanding consciousness guided theory evolution. The theory includes 4 concepts—influencing factors, toward authentic dasein, mapping out the future, and living with cancer—each of which has several dimensions. Based on this theory, nursing interventions can be developed and tested to support persons with cancer. © 2020 Wolters Kluwer Health, Inc. All rights reserved.