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Nicolau IA, Moineddin R, Brooks JD, Antoniou T, Gillis JL, Kendall CE, Cooper C, Cotterchio M, Salters K, Smieja M, Kroch AE, Price C, Mohamed A, Burchell AN. Associations of CD4 Cell Count Measures With Infection-Related and Infection-Unrelated Cancer Risk Among People With HIV. J Acquir Immune Defic Syndr 2024; 96:447-456. [PMID: 38985442 DOI: 10.1097/qai.0000000000003452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Accepted: 04/09/2024] [Indexed: 07/11/2024]
Abstract
BACKGROUND People with HIV are at higher risk of infection-related cancers than the general population, which could be due, in part, to immune dysfunction. Our objective was to examine associations between 4 CD4 count measures as indicators of immune function and infection-related and infection-unrelated cancer risk. SETTING We conducted a cohort study of adults with HIV who were diagnosed with cancer in Ontario, Canada. Incident cancers were identified from January 1, 1997 to December 31, 2020. METHODS We estimated adjusted hazard ratios (aHR) for the associations between CD4 measures (baseline CD4, nadir CD4, time-updated CD4, time-updated CD4:CD8) and cancer incidence rates using competing risk analyses, adjusted for socio-demographic factors, history of hepatitis B or C infection, baseline viral load, smoking, and alcohol use. RESULTS Among 4771 people with HIV, contributing 59,111 person-years of observation, a total of 549 cancers were observed. Low baseline CD4 (<200 cells/µL) (aHR 2.08 [95% CI: 1.38 to 3.13], nadir (<200 cells/µL) (aHR 2.01 [95% CI: 1.49 to 2.71]), low time-updated CD4 (aHR 3.52 [95% CI: 2.36 to 5.24]) and time-updated CD4:CD8 ratio (<0.4) (aHR 2.02 [95% CI: 1.08 to 3.79]) were associated with an increased rate of infection-related cancer. No associations were observed for infection-unrelated cancers. CONCLUSIONS Low CD4 counts and indices were associated with increased rates of infection-related cancers among people with HIV, irrespective of the CD4 measure used. Early diagnosis and linkage to care and high antiretroviral therapy uptake may lead to improved immune function and could add to cancer prevention strategies such as screening and vaccine uptake.
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Affiliation(s)
- Ioana A Nicolau
- Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
- Li Ka Shing Knowledge Institute, St Michael's Hospital, Unity Health Toronto, Toronto, Ontario, Canada
| | - Rahim Moineddin
- Department of Family and Community Medicine, University of Toronto, Toronto, Ontario, Canada
- ICES, Toronto, Ontario, Canada
| | - Jennifer D Brooks
- Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
| | - Tony Antoniou
- Li Ka Shing Knowledge Institute, St Michael's Hospital, Unity Health Toronto, Toronto, Ontario, Canada
- Department of Family and Community Medicine, University of Toronto, Toronto, Ontario, Canada
- ICES, Toronto, Ontario, Canada
| | | | - Claire E Kendall
- ICES, Toronto, Ontario, Canada
- Bruyère Research Institute, Ottawa, Ontario, Canada
- Department of Family Medicine, University of Ottawa, Ottawa, Ontario, Canada
- Institut du Savoir Montfort, Ottawa, Ontario, Canada
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
| | - Curtis Cooper
- Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
| | - Michelle Cotterchio
- Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
- Ontario Health (Cancer Care Ontario), Toronto, Ontario, Canada
| | - Kate Salters
- British Columbia Centre for Excellence in HIV/AIDS, Vancouver, British Columbia, Canada
| | | | - Abigail E Kroch
- Ontario HIV Treatment Network, Toronto, Ontario, Canada; and
| | - Colleen Price
- Canadian HIV/AIDS and Chronic Pain Society, Ottawa, Ontario, Canada
| | - Anthony Mohamed
- Li Ka Shing Knowledge Institute, St Michael's Hospital, Unity Health Toronto, Toronto, Ontario, Canada
| | - Ann N Burchell
- Li Ka Shing Knowledge Institute, St Michael's Hospital, Unity Health Toronto, Toronto, Ontario, Canada
- Department of Family and Community Medicine, University of Toronto, Toronto, Ontario, Canada
- ICES, Toronto, Ontario, Canada
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Nicolau IA, Antoniou T, Brooks JD, Moineddin R, Cooper C, Cotterchio M, Gillis JL, Kendall CE, Kroch AE, Lindsay JD, Price C, Salters K, Smieja M, Burchell AN. The burden of cancer among people living with HIV in Ontario, Canada, 1997-2020: a retrospective population-based cohort study using administrative health data. CMAJ Open 2022; 10:E666-E674. [PMID: 35853661 PMCID: PMC9312995 DOI: 10.9778/cmajo.20220012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND With combination antiretroviral therapy (ART) and increased longevity, cancer is a leading cause of morbidity among people with HIV. We characterized trends in cancer burden among people with HIV in Ontario, Canada, between 1997 and 2020. METHODS We conducted a population-based, retrospective cohort study of adults with HIV using linked administrative health databases from Jan. 1, 1997, to Nov. 1, 2020. We grouped cancers as infection-related AIDS-defining cancers (ADCs), infection-related non-ADCs (NADCs) and infection-unrelated cancers. We calculated age-standardized incidence rates per 100 000 person-years with 95% confidence intervals (CIs) using direct standardization, stratified by calendar period and sex. We also calculated limited-duration prevalence. RESULTS Among 19 403 adults living with HIV (79% males), 1275 incident cancers were diagnosed. From 1997-2000 to 2016- 2020, we saw a decrease in the incidence of all cancers (1113.9 [95% CI 657.7-1765.6] to 683.5 [95% CI 613.4-759.4] per 100 000 person-years), ADCs (403.1 [95% CI 194.2-739.0] to 103.8 [95% CI 79.2-133.6] per 100 000 person-years) and infection-related NADCs (196.6 [95% CI 37.9-591.9] to 121.9 [95% CI 94.3-154.9] per 100 000 person-years). The incidence of infection-unrelated cancers was stable at 451.0 per 100 000 person-years (95% CI 410.3-494.7). The incidence of cancer among females increased over time but was similar to that of males in 2016-2020. INTERPRETATION Over a 24-year period, the incidence of cancer decreased overall, largely driven by a considerable decrease in the incidence of ADC, whereas the incidence of infection-unrelated cancer remained unchanged and contributed to the greatest burden of cancer. These findings could reflect combination ART-mediated changes in infectious comorbidity and increased life expectancy; targeted cancer screening and prevention strategies are needed.
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Affiliation(s)
- Ioana A Nicolau
- Division of Epidemiology Toronto (Nicolau, Brooks, Cotterchio, Gillis, Burchell, Dalla Lana School of Public Health, University of Toronto; ICES Central (Antoniou, Moineddin, Kendall, Burchell); Unity Health Toronto (Antoniou, Lindsay, Burchell), St Michael's Hospital; Department of Family and Community Medicine (Moineddin, Burchell), University of Toronto, Toronto, Ont.; Ottawa Hospital Research Institute (Cooper), Ottawa, Ont.; Ontario Health (Cancer Care Ontario) (Cotterchio), Toronto, Ont.; Department of Medicine (Gillis), School of Population and Public Health, University of British Columbia, Vancouver, BC; Bruyère Research Institute (Kendall); ICES uOttawa (Kendall); Department of Family Medicine (Kendall), University of Ottawa; Institut du Savoir Montfort (Kendall); Clinical Epidemiology Program (Kendall), Ottawa Hospital Research Institute, Ottawa, Ont.; Ontario HIV Treatment Network (Kroch), Toronto, Ont.; CIHR Canadian HIV Trials Network - Chronic Pain and HIV Working Group (Price); British Columbia Centre for Excellence in HIV/AIDS (Salters), Vancouver, BC; Department of Pathology and Molecular Medicine (Smieja), McMaster University (Smieja), Hamilton, Ont
| | - Tony Antoniou
- Division of Epidemiology Toronto (Nicolau, Brooks, Cotterchio, Gillis, Burchell, Dalla Lana School of Public Health, University of Toronto; ICES Central (Antoniou, Moineddin, Kendall, Burchell); Unity Health Toronto (Antoniou, Lindsay, Burchell), St Michael's Hospital; Department of Family and Community Medicine (Moineddin, Burchell), University of Toronto, Toronto, Ont.; Ottawa Hospital Research Institute (Cooper), Ottawa, Ont.; Ontario Health (Cancer Care Ontario) (Cotterchio), Toronto, Ont.; Department of Medicine (Gillis), School of Population and Public Health, University of British Columbia, Vancouver, BC; Bruyère Research Institute (Kendall); ICES uOttawa (Kendall); Department of Family Medicine (Kendall), University of Ottawa; Institut du Savoir Montfort (Kendall); Clinical Epidemiology Program (Kendall), Ottawa Hospital Research Institute, Ottawa, Ont.; Ontario HIV Treatment Network (Kroch), Toronto, Ont.; CIHR Canadian HIV Trials Network - Chronic Pain and HIV Working Group (Price); British Columbia Centre for Excellence in HIV/AIDS (Salters), Vancouver, BC; Department of Pathology and Molecular Medicine (Smieja), McMaster University (Smieja), Hamilton, Ont
| | - Jennifer D Brooks
- Division of Epidemiology Toronto (Nicolau, Brooks, Cotterchio, Gillis, Burchell, Dalla Lana School of Public Health, University of Toronto; ICES Central (Antoniou, Moineddin, Kendall, Burchell); Unity Health Toronto (Antoniou, Lindsay, Burchell), St Michael's Hospital; Department of Family and Community Medicine (Moineddin, Burchell), University of Toronto, Toronto, Ont.; Ottawa Hospital Research Institute (Cooper), Ottawa, Ont.; Ontario Health (Cancer Care Ontario) (Cotterchio), Toronto, Ont.; Department of Medicine (Gillis), School of Population and Public Health, University of British Columbia, Vancouver, BC; Bruyère Research Institute (Kendall); ICES uOttawa (Kendall); Department of Family Medicine (Kendall), University of Ottawa; Institut du Savoir Montfort (Kendall); Clinical Epidemiology Program (Kendall), Ottawa Hospital Research Institute, Ottawa, Ont.; Ontario HIV Treatment Network (Kroch), Toronto, Ont.; CIHR Canadian HIV Trials Network - Chronic Pain and HIV Working Group (Price); British Columbia Centre for Excellence in HIV/AIDS (Salters), Vancouver, BC; Department of Pathology and Molecular Medicine (Smieja), McMaster University (Smieja), Hamilton, Ont
| | - Rahim Moineddin
- Division of Epidemiology Toronto (Nicolau, Brooks, Cotterchio, Gillis, Burchell, Dalla Lana School of Public Health, University of Toronto; ICES Central (Antoniou, Moineddin, Kendall, Burchell); Unity Health Toronto (Antoniou, Lindsay, Burchell), St Michael's Hospital; Department of Family and Community Medicine (Moineddin, Burchell), University of Toronto, Toronto, Ont.; Ottawa Hospital Research Institute (Cooper), Ottawa, Ont.; Ontario Health (Cancer Care Ontario) (Cotterchio), Toronto, Ont.; Department of Medicine (Gillis), School of Population and Public Health, University of British Columbia, Vancouver, BC; Bruyère Research Institute (Kendall); ICES uOttawa (Kendall); Department of Family Medicine (Kendall), University of Ottawa; Institut du Savoir Montfort (Kendall); Clinical Epidemiology Program (Kendall), Ottawa Hospital Research Institute, Ottawa, Ont.; Ontario HIV Treatment Network (Kroch), Toronto, Ont.; CIHR Canadian HIV Trials Network - Chronic Pain and HIV Working Group (Price); British Columbia Centre for Excellence in HIV/AIDS (Salters), Vancouver, BC; Department of Pathology and Molecular Medicine (Smieja), McMaster University (Smieja), Hamilton, Ont
| | - Curtis Cooper
- Division of Epidemiology Toronto (Nicolau, Brooks, Cotterchio, Gillis, Burchell, Dalla Lana School of Public Health, University of Toronto; ICES Central (Antoniou, Moineddin, Kendall, Burchell); Unity Health Toronto (Antoniou, Lindsay, Burchell), St Michael's Hospital; Department of Family and Community Medicine (Moineddin, Burchell), University of Toronto, Toronto, Ont.; Ottawa Hospital Research Institute (Cooper), Ottawa, Ont.; Ontario Health (Cancer Care Ontario) (Cotterchio), Toronto, Ont.; Department of Medicine (Gillis), School of Population and Public Health, University of British Columbia, Vancouver, BC; Bruyère Research Institute (Kendall); ICES uOttawa (Kendall); Department of Family Medicine (Kendall), University of Ottawa; Institut du Savoir Montfort (Kendall); Clinical Epidemiology Program (Kendall), Ottawa Hospital Research Institute, Ottawa, Ont.; Ontario HIV Treatment Network (Kroch), Toronto, Ont.; CIHR Canadian HIV Trials Network - Chronic Pain and HIV Working Group (Price); British Columbia Centre for Excellence in HIV/AIDS (Salters), Vancouver, BC; Department of Pathology and Molecular Medicine (Smieja), McMaster University (Smieja), Hamilton, Ont
| | - Michelle Cotterchio
- Division of Epidemiology Toronto (Nicolau, Brooks, Cotterchio, Gillis, Burchell, Dalla Lana School of Public Health, University of Toronto; ICES Central (Antoniou, Moineddin, Kendall, Burchell); Unity Health Toronto (Antoniou, Lindsay, Burchell), St Michael's Hospital; Department of Family and Community Medicine (Moineddin, Burchell), University of Toronto, Toronto, Ont.; Ottawa Hospital Research Institute (Cooper), Ottawa, Ont.; Ontario Health (Cancer Care Ontario) (Cotterchio), Toronto, Ont.; Department of Medicine (Gillis), School of Population and Public Health, University of British Columbia, Vancouver, BC; Bruyère Research Institute (Kendall); ICES uOttawa (Kendall); Department of Family Medicine (Kendall), University of Ottawa; Institut du Savoir Montfort (Kendall); Clinical Epidemiology Program (Kendall), Ottawa Hospital Research Institute, Ottawa, Ont.; Ontario HIV Treatment Network (Kroch), Toronto, Ont.; CIHR Canadian HIV Trials Network - Chronic Pain and HIV Working Group (Price); British Columbia Centre for Excellence in HIV/AIDS (Salters), Vancouver, BC; Department of Pathology and Molecular Medicine (Smieja), McMaster University (Smieja), Hamilton, Ont
| | - Jennifer L Gillis
- Division of Epidemiology Toronto (Nicolau, Brooks, Cotterchio, Gillis, Burchell, Dalla Lana School of Public Health, University of Toronto; ICES Central (Antoniou, Moineddin, Kendall, Burchell); Unity Health Toronto (Antoniou, Lindsay, Burchell), St Michael's Hospital; Department of Family and Community Medicine (Moineddin, Burchell), University of Toronto, Toronto, Ont.; Ottawa Hospital Research Institute (Cooper), Ottawa, Ont.; Ontario Health (Cancer Care Ontario) (Cotterchio), Toronto, Ont.; Department of Medicine (Gillis), School of Population and Public Health, University of British Columbia, Vancouver, BC; Bruyère Research Institute (Kendall); ICES uOttawa (Kendall); Department of Family Medicine (Kendall), University of Ottawa; Institut du Savoir Montfort (Kendall); Clinical Epidemiology Program (Kendall), Ottawa Hospital Research Institute, Ottawa, Ont.; Ontario HIV Treatment Network (Kroch), Toronto, Ont.; CIHR Canadian HIV Trials Network - Chronic Pain and HIV Working Group (Price); British Columbia Centre for Excellence in HIV/AIDS (Salters), Vancouver, BC; Department of Pathology and Molecular Medicine (Smieja), McMaster University (Smieja), Hamilton, Ont
| | - Claire E Kendall
- Division of Epidemiology Toronto (Nicolau, Brooks, Cotterchio, Gillis, Burchell, Dalla Lana School of Public Health, University of Toronto; ICES Central (Antoniou, Moineddin, Kendall, Burchell); Unity Health Toronto (Antoniou, Lindsay, Burchell), St Michael's Hospital; Department of Family and Community Medicine (Moineddin, Burchell), University of Toronto, Toronto, Ont.; Ottawa Hospital Research Institute (Cooper), Ottawa, Ont.; Ontario Health (Cancer Care Ontario) (Cotterchio), Toronto, Ont.; Department of Medicine (Gillis), School of Population and Public Health, University of British Columbia, Vancouver, BC; Bruyère Research Institute (Kendall); ICES uOttawa (Kendall); Department of Family Medicine (Kendall), University of Ottawa; Institut du Savoir Montfort (Kendall); Clinical Epidemiology Program (Kendall), Ottawa Hospital Research Institute, Ottawa, Ont.; Ontario HIV Treatment Network (Kroch), Toronto, Ont.; CIHR Canadian HIV Trials Network - Chronic Pain and HIV Working Group (Price); British Columbia Centre for Excellence in HIV/AIDS (Salters), Vancouver, BC; Department of Pathology and Molecular Medicine (Smieja), McMaster University (Smieja), Hamilton, Ont
| | - Abigail E Kroch
- Division of Epidemiology Toronto (Nicolau, Brooks, Cotterchio, Gillis, Burchell, Dalla Lana School of Public Health, University of Toronto; ICES Central (Antoniou, Moineddin, Kendall, Burchell); Unity Health Toronto (Antoniou, Lindsay, Burchell), St Michael's Hospital; Department of Family and Community Medicine (Moineddin, Burchell), University of Toronto, Toronto, Ont.; Ottawa Hospital Research Institute (Cooper), Ottawa, Ont.; Ontario Health (Cancer Care Ontario) (Cotterchio), Toronto, Ont.; Department of Medicine (Gillis), School of Population and Public Health, University of British Columbia, Vancouver, BC; Bruyère Research Institute (Kendall); ICES uOttawa (Kendall); Department of Family Medicine (Kendall), University of Ottawa; Institut du Savoir Montfort (Kendall); Clinical Epidemiology Program (Kendall), Ottawa Hospital Research Institute, Ottawa, Ont.; Ontario HIV Treatment Network (Kroch), Toronto, Ont.; CIHR Canadian HIV Trials Network - Chronic Pain and HIV Working Group (Price); British Columbia Centre for Excellence in HIV/AIDS (Salters), Vancouver, BC; Department of Pathology and Molecular Medicine (Smieja), McMaster University (Smieja), Hamilton, Ont
| | - Joanne D Lindsay
- Division of Epidemiology Toronto (Nicolau, Brooks, Cotterchio, Gillis, Burchell, Dalla Lana School of Public Health, University of Toronto; ICES Central (Antoniou, Moineddin, Kendall, Burchell); Unity Health Toronto (Antoniou, Lindsay, Burchell), St Michael's Hospital; Department of Family and Community Medicine (Moineddin, Burchell), University of Toronto, Toronto, Ont.; Ottawa Hospital Research Institute (Cooper), Ottawa, Ont.; Ontario Health (Cancer Care Ontario) (Cotterchio), Toronto, Ont.; Department of Medicine (Gillis), School of Population and Public Health, University of British Columbia, Vancouver, BC; Bruyère Research Institute (Kendall); ICES uOttawa (Kendall); Department of Family Medicine (Kendall), University of Ottawa; Institut du Savoir Montfort (Kendall); Clinical Epidemiology Program (Kendall), Ottawa Hospital Research Institute, Ottawa, Ont.; Ontario HIV Treatment Network (Kroch), Toronto, Ont.; CIHR Canadian HIV Trials Network - Chronic Pain and HIV Working Group (Price); British Columbia Centre for Excellence in HIV/AIDS (Salters), Vancouver, BC; Department of Pathology and Molecular Medicine (Smieja), McMaster University (Smieja), Hamilton, Ont
| | - Colleen Price
- Division of Epidemiology Toronto (Nicolau, Brooks, Cotterchio, Gillis, Burchell, Dalla Lana School of Public Health, University of Toronto; ICES Central (Antoniou, Moineddin, Kendall, Burchell); Unity Health Toronto (Antoniou, Lindsay, Burchell), St Michael's Hospital; Department of Family and Community Medicine (Moineddin, Burchell), University of Toronto, Toronto, Ont.; Ottawa Hospital Research Institute (Cooper), Ottawa, Ont.; Ontario Health (Cancer Care Ontario) (Cotterchio), Toronto, Ont.; Department of Medicine (Gillis), School of Population and Public Health, University of British Columbia, Vancouver, BC; Bruyère Research Institute (Kendall); ICES uOttawa (Kendall); Department of Family Medicine (Kendall), University of Ottawa; Institut du Savoir Montfort (Kendall); Clinical Epidemiology Program (Kendall), Ottawa Hospital Research Institute, Ottawa, Ont.; Ontario HIV Treatment Network (Kroch), Toronto, Ont.; CIHR Canadian HIV Trials Network - Chronic Pain and HIV Working Group (Price); British Columbia Centre for Excellence in HIV/AIDS (Salters), Vancouver, BC; Department of Pathology and Molecular Medicine (Smieja), McMaster University (Smieja), Hamilton, Ont
| | - Kate Salters
- Division of Epidemiology Toronto (Nicolau, Brooks, Cotterchio, Gillis, Burchell, Dalla Lana School of Public Health, University of Toronto; ICES Central (Antoniou, Moineddin, Kendall, Burchell); Unity Health Toronto (Antoniou, Lindsay, Burchell), St Michael's Hospital; Department of Family and Community Medicine (Moineddin, Burchell), University of Toronto, Toronto, Ont.; Ottawa Hospital Research Institute (Cooper), Ottawa, Ont.; Ontario Health (Cancer Care Ontario) (Cotterchio), Toronto, Ont.; Department of Medicine (Gillis), School of Population and Public Health, University of British Columbia, Vancouver, BC; Bruyère Research Institute (Kendall); ICES uOttawa (Kendall); Department of Family Medicine (Kendall), University of Ottawa; Institut du Savoir Montfort (Kendall); Clinical Epidemiology Program (Kendall), Ottawa Hospital Research Institute, Ottawa, Ont.; Ontario HIV Treatment Network (Kroch), Toronto, Ont.; CIHR Canadian HIV Trials Network - Chronic Pain and HIV Working Group (Price); British Columbia Centre for Excellence in HIV/AIDS (Salters), Vancouver, BC; Department of Pathology and Molecular Medicine (Smieja), McMaster University (Smieja), Hamilton, Ont
| | - Marek Smieja
- Division of Epidemiology Toronto (Nicolau, Brooks, Cotterchio, Gillis, Burchell, Dalla Lana School of Public Health, University of Toronto; ICES Central (Antoniou, Moineddin, Kendall, Burchell); Unity Health Toronto (Antoniou, Lindsay, Burchell), St Michael's Hospital; Department of Family and Community Medicine (Moineddin, Burchell), University of Toronto, Toronto, Ont.; Ottawa Hospital Research Institute (Cooper), Ottawa, Ont.; Ontario Health (Cancer Care Ontario) (Cotterchio), Toronto, Ont.; Department of Medicine (Gillis), School of Population and Public Health, University of British Columbia, Vancouver, BC; Bruyère Research Institute (Kendall); ICES uOttawa (Kendall); Department of Family Medicine (Kendall), University of Ottawa; Institut du Savoir Montfort (Kendall); Clinical Epidemiology Program (Kendall), Ottawa Hospital Research Institute, Ottawa, Ont.; Ontario HIV Treatment Network (Kroch), Toronto, Ont.; CIHR Canadian HIV Trials Network - Chronic Pain and HIV Working Group (Price); British Columbia Centre for Excellence in HIV/AIDS (Salters), Vancouver, BC; Department of Pathology and Molecular Medicine (Smieja), McMaster University (Smieja), Hamilton, Ont
| | - Ann N Burchell
- Division of Epidemiology Toronto (Nicolau, Brooks, Cotterchio, Gillis, Burchell, Dalla Lana School of Public Health, University of Toronto; ICES Central (Antoniou, Moineddin, Kendall, Burchell); Unity Health Toronto (Antoniou, Lindsay, Burchell), St Michael's Hospital; Department of Family and Community Medicine (Moineddin, Burchell), University of Toronto, Toronto, Ont.; Ottawa Hospital Research Institute (Cooper), Ottawa, Ont.; Ontario Health (Cancer Care Ontario) (Cotterchio), Toronto, Ont.; Department of Medicine (Gillis), School of Population and Public Health, University of British Columbia, Vancouver, BC; Bruyère Research Institute (Kendall); ICES uOttawa (Kendall); Department of Family Medicine (Kendall), University of Ottawa; Institut du Savoir Montfort (Kendall); Clinical Epidemiology Program (Kendall), Ottawa Hospital Research Institute, Ottawa, Ont.; Ontario HIV Treatment Network (Kroch), Toronto, Ont.; CIHR Canadian HIV Trials Network - Chronic Pain and HIV Working Group (Price); British Columbia Centre for Excellence in HIV/AIDS (Salters), Vancouver, BC; Department of Pathology and Molecular Medicine (Smieja), McMaster University (Smieja), Hamilton, Ont.
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