Mary De Vera

The full abstract for this thesis is available in the body of the thesis, and will be available when the embargo expires.

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Introduction: Recent evidence suggests that the risk of young-onset colorectal cancer (yCRC) is significantly increasing. Furthermore, the information needs of this population are not well understood. Unmet information needs are associated with ineffective disease self-management and negative health outcomes. Therefore, it is pertinent to understand the changing epidemiology of yCRC and the information needs of this population.Objectives: This thesis aims 1) to systematically review the literature on the incidence and prevalence trends of yCRC; 2) to determine the information-seeking behaviours of individuals with yCRC; and 3) to determine the information needs of individuals with yCRC. Methods: To address Objective 1, a systematic review was conducted. Databases were searched for studies that: used an epidemiologic design, assessed trends in yCRC incidence or prevalence, and published in English. To address Objective 2, descriptive statistics and proportions of information-seeking behaviours were reported. Lastly, Objective 3 was addressed by reporting proportions of information items unmet. Predictors of corresponding unmet information needs were assessed using multivariable logistic regression models. Results: 1) The search returned 8,695 articles with 40 studies from 12 countries across five continents. Thirty-nine studies assessed trends in yCRC incidence and only one study prevalence trends. Noteworthy, 17 studies from North America and Oceania consistently reported increasing incidence trends in yCRC. Among studies assessing cancer site, nine (of 14) showed an increased risk of rectal cancer in adults less than 50 years. 2) A sample of 366 yCRC respondents, predominantly consisting of highly-educated white women, was analyzed. At respondents’ most recent search of yCRC information (N= 323), 143 respondents relied on the Internet. 3) Among 39 information need items, 26 unmet information needs were found. Conclusion: This thesis provided evidence that risk of yCRC is increasing predominantly in North America and Oceania, driven by rising rectal cancers in younger adults over the past two decades. In addition, this thesis reports that the information needs of the recruited sample were substantially unmet.

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Introduction: Suboptimal medication adherence and poor health outcomes in patients with gout, the most common inflammatory arthritis, has prompted efforts to optimize care delivery. The Virtual Gout Clinic, an electronic health technology supported collaborative care model for gout involving rheumatology, pharmacy, and dietetics, offers a promising solution. The purpose of this thesis is to gain an in-depth understanding of how individuals engage in managing their gout and also explore the complexity of the Virtual Gout Clinic using mixed methods to optimize the context and delivery of this care model.Objectives: 1) To explore individual experiences with gout in a Canadian population and to understand the phenomenon of becoming actively engaged in the management of gout with an emphasis on factors which facilitate management; and 2) to explore how participants with gout experience the Virtual Gout Clinic and to understand and explain quantitative outcomes from the evaluation of this care model.Methods: For the first objective, I used a constructivist grounded theory design and conducted semi-structured telephone interviews with participants diagnosed with gout completing the Virtual Gout Clinic. I applied an explanatory sequential mixed methods design for objective 2, as this design enables interview questions used in the qualitative component to be informed by quantitative outcomes of the Virtual Gout Clinic (adherence, serum uric acid) for a comprehensive final interpretation. Results: 1) Analysis of 12 interviews constructed four themes: describing the severity of gout; processing the diagnosis and management of gout; interfering with management of gout; and facilitating management of gout. 2) The experience of the Virtual Gout Clinic was described by three conceptual categories: learning through the Virtual Gout Clinic; receiving personalized support; and knowing someone cares. Suboptimal health outcomes were explained by practical and perceptual barriers to gout management, such as lacking knowledge and fearing side-effects of medications. Conclusion: This thesis provided novel insight into the process of patients becoming actively engaged in the management of gout with an emphasis on facilitating factors. An interdisciplinary model of care is a promising approach to optimize care delivery by providing both emotional and practical support as well as ongoing individualized education.

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Introduction: This thesis comprises a systematic review and a pharmacoepidemiological study aimed at improving the understanding about medication non-adherence to antimalarials (AM) in Systematic Lupus Erythematosus (SLE). AM is the conventional and effective long-term treatment option that has resulted in substantial decreases in deaths associated with SLE disease activity. However, there seems to be no such decline in the deaths associated with the sequelae of SLE (such as circulatory disease). Since deriving therapeutic effects from AM depends not only on physicians prescribing the appropriate treatment, but also on patients’ adherence with selected treatment, there is the need for a better understanding of medication non-adherence to AM in SLE.Objective: 1) To systematically review and synthesize the literature on medication adherence in SLE to identify key gaps in the literature; and 2) to evaluate the burden and determinants of medication non-adherence to AM in SLE.Methods: To address Objective 1, I have conducted a systematic review. I conducted a mapped search of Medline, Embase, and Web of Science to identify original, observational studies that indicated the data source and measurement tool to assess medication adherence in a SLE patient sample. To address Objective 2, I have conducted a longitudinal pharmacoepidemiological study of a population-based SLE cohort. I used a Cox’s proportional hazard ratio model to examine factors that were significantly associated with discontinuation of AM. Results: 1) 11 studies were included in the systematic review, and the majority of these studies reported that less than 50% of SLE patients are sufficiently adherent to their medications; 2) After five years, only 33% of patients remained on AM therapy; and 3) Higher SES and the following time-varying covariates updated monthly: glucocorticoids use, traditional NSAIDs use, rate of rheumatologist visits, and rate of dermatologists were statistically significantly protective against discontinuation of AM therapy. Conclusion: Altogether as a collective work, this thesis provides evidence that demonstrates medication non-adherence is a substantial problem in SLE. In addition, it highlights the importance of developing adherence interventions to help support patients taking their medications as prescribed.

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