TNFSF13B and AIDS: Among 1612 participants in the MACS (Multicenter AIDS Cohort Study) cohort, men living with HIV who have sex with men recruited from 4 different cities in the United States were shown have been shown to have prolonged QT intervals on 12-led standing resting electrocardiograms, which was associated with systemic inflammatory markers, including ICAM-1 (intercellular adhesion molecule 1), IL (interleukin)-6, and BAFF (B-cell activating factor).25