Keith Sigel1, Juan Wisnivesky2, Kristina Crothers3, Kirsha Gordon4, Sheldon T Brown5, David Rimland6, Maria C Rodriguez-Barradas7, Cynthia Gibert8, Matthew Bidwell Goetz9, Roger Bedimo10, Lesley S Park11, Robert Dubrow12. 1. Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA. Electronic address: keith.sigel@mssm.edu. 2. Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA. 3. Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA. 4. Department of Medicine, VA Connecticut Healthcare System and Yale Schools of Medicine and Public Health, New Haven, CT, USA. 5. Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA; Infectious Diseases Section, James J Peters VA Medical Center, Bronx, NY, USA. 6. Infectious Diseases Section, Atlanta VA Medical Center and Emory University School of Medicine, Decatur, GA, USA. 7. Infectious Diseases Section, Michael E DeBakey Veterans Affairs Medical Center and Baylor College of Medicine, Houston, TX, USA. 8. Department of Medicine, George Washington University School of Medicine and Washington DC Veterans Affairs Medical Center, Washington, DC, USA. 9. Department of Medicine, VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA; David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA. 10. Division of Infectious Diseases, VA North Texas Health Care System, Dallas, TX, USA. 11. Center for Population Health Sciences, Stanford University School of Medicine, Palo Alto, CA, USA. 12. Department of Chronic Disease Epidemiology, Yale School of Public Health, New Haven, CT, USA.
Abstract
BACKGROUND: HIV infection is independently associated with risk of lung cancer, but few data exist for the relation between longitudinal measurements of immune function and lung-cancer risk in people living with HIV. METHODS: We followed up participants with HIV from the Veterans Aging Cohort Study for a minimum of 3 years between Jan 1, 1998, and Dec 31, 2012, and used cancer registry data to identify incident cases of lung cancer. The index date for each patient was the later of the date HIV care began or Jan 1, 1998. We excluded patients with less than 3 years' follow-up, prevalent diagnoses of lung cancer, or incomplete laboratory data. We used Cox regression models to investigate the relation between different time-updated lagged and cumulative exposures (CD4 cell count, CD8 cell count, CD4/CD8 ratio, HIV RNA, and bacterial pneumonia) and risk of lung cancer. Models were adjusted for age, race or ethnicity, smoking, hepatitis C virus infection, alcohol use disorders, drug use disorders, and history of chronic obstructive pulmonary disease and occupational lung disease. FINDINGS: We identified 277 cases of incident lung cancer in 21 666 participants with HIV. In separate models for each time-updated 12 month lagged, 24 month simple moving average cumulative exposure, increased risk of lung cancer was associated with low CD4 cell count (p trend=0·001), low CD4/CD8 ratio (p trend=0·0001), high HIV RNA concentration (p=0·004), and more cumulative bacterial pneumonia episodes (12 month lag only; p trend=0·0004). In a mutually adjusted model including these factors, CD4/CD8 ratio and cumulative bacterial pneumonia episodes remained significant (p trends 0·003 and 0·004, respectively). INTERPRETATION: In our large HIV cohort in the antiretroviral therapy era, we found evidence that dysfunctional immune activation and chronic inflammation contribute to the development of lung cancer in the setting of HIV infection. These findings could be used to target lung-cancer prevention measures to high-risk groups. FUNDING: US National Institutes of Health.
BACKGROUND:HIV infection is independently associated with risk of lung cancer, but few data exist for the relation between longitudinal measurements of immune function and lung-cancer risk in people living with HIV. METHODS: We followed up participants with HIV from the Veterans Aging Cohort Study for a minimum of 3 years between Jan 1, 1998, and Dec 31, 2012, and used cancer registry data to identify incident cases of lung cancer. The index date for each patient was the later of the date HIV care began or Jan 1, 1998. We excluded patients with less than 3 years' follow-up, prevalent diagnoses of lung cancer, or incomplete laboratory data. We used Cox regression models to investigate the relation between different time-updated lagged and cumulative exposures (CD4 cell count, CD8 cell count, CD4/CD8 ratio, HIV RNA, and bacterial pneumonia) and risk of lung cancer. Models were adjusted for age, race or ethnicity, smoking, hepatitis C virus infection, alcohol use disorders, drug use disorders, and history of chronic obstructive pulmonary disease and occupational lung disease. FINDINGS: We identified 277 cases of incident lung cancer in 21 666 participants with HIV. In separate models for each time-updated 12 month lagged, 24 month simple moving average cumulative exposure, increased risk of lung cancer was associated with low CD4 cell count (p trend=0·001), low CD4/CD8 ratio (p trend=0·0001), high HIV RNA concentration (p=0·004), and more cumulative bacterial pneumonia episodes (12 month lag only; p trend=0·0004). In a mutually adjusted model including these factors, CD4/CD8 ratio and cumulative bacterial pneumonia episodes remained significant (p trends 0·003 and 0·004, respectively). INTERPRETATION: In our large HIV cohort in the antiretroviral therapy era, we found evidence that dysfunctional immune activation and chronic inflammation contribute to the development of lung cancer in the setting of HIV infection. These findings could be used to target lung-cancer prevention measures to high-risk groups. FUNDING: US National Institutes of Health.
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