The extent of B-cell activation and dysfunction preceding lymphoma development in HIV-positive people

Shepherd, L.; Borges, A. H.; Harvey, R.; Bower, M.; Grulich, A.; Silverberg, M.; Weber, J.; Ristola, M.; Viard, J-P; Bogner, J. R.; Gargalianos-Kakolyris, P.; Mussini, C.; Mansinho, K.; Yust, I.; Paduta, D.; Jilich, D.; Smiatacz, T.; Radoi, R.; Tomazic, J.; Plomgaard, P.; Frikke-Schmidt, R.; Lundgren, J. und Mocroft, A. (2018): The extent of B-cell activation and dysfunction preceding lymphoma development in HIV-positive people. In: Hiv Medicine, Bd. 19, Nr. 2: S. 90-101

Abstract

Objective: B-cell dysfunction and activation are thought to contribute to lymphoma development in HIV-positive people;however, the mechanisms are not well understood. We investigated levels of several markers of B-cell dysfunction [free light chain (FLC)-, FLC-, immunoglobulin G (IgG), IgA, IgM and IgD] prior to lymphoma diagnosis in HIV-positive people. Methods: A nested matched case-control study was carried out within the EuroSIDA cohort, including 73 HIV-positive people with lymphoma and 143 HIV-positive lymphoma-free controls. Markers of B-cell dysfunction were measured in prospectively stored serial plasma samples collected before the diagnosis of lymphoma (or selection date in controls). Marker levels 2 and > 2 years prior to diagnosis were investigated. Results: Two-fold higher levels of FLC- [odds ratio (OR) 1.84;95% confidence interval (CI) 1.19, 2.84], FLC- (OR 2.15;95% CI 1.34, 3.46), IgG (OR 3.05;95% CI 1.41, 6.59) and IgM (OR 1.46;95% CI 1.01, 2.11) were associated with increased risk of lymphoma > 2 years prior to diagnosis, but not 2 years prior. Despite significant associations > 2 years prior to diagnosis, the predictive accuracy of each marker was poor, with FLC- emerging as the strongest candidate with a c-statistic of 0.67 (95% CI 0.58, 0.76). Conclusion: sFLC-, FLC- and IgG levels were higher > 2 years before lymphoma diagnosis, suggesting that B-cell dysfunction occurs many years prior to lymphoma development. However, the predictive value of each marker was low and they are unlikely candidates for risk assessment for targeted intervention.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 1464-2662
• Sprache: Englisch