title: AIDS events among individuals initiating HAART: do some patients experience a greater benefit from HAART than others?
abstract: OBJECTIVE
  To describe the rate of new AIDS events over the first year of HAART in patients with different characteristics and to describe the decrease in incidence of AIDS between the first and second 6 months of the year in these patients.
  
  
  METHODS
  Collaboration of cohort studies from Europe and North America.
  
  
  METHODS
  AIDS rates in the first year of HAART were calculated for 22 217 antiretroviral-naive individuals. Event rates were compared in the periods 0-6 and 7-12 months after starting HAART.
  
  
  RESULTS
  The number of events and person-years of follow-up (PYFU) in the two time periods were 1185 (9601) and 336 (8690), respectively (event rates: 12.3 and 3.9 per 100 PYFU, relative decline in incidence: 68%). Whereas rates decreased in all groups, tests for interaction suggested that relative declines in incidence were more rapid in homosexual men (P = 0.002), in those starting HAART from 2001 in comparison with earlier years (P = 0.03), in those with lower CD4 cell counts (P-values of 0.001, 0.002 and 0.11 for those with cell counts < 50, 50-199 and 200-349 cells/microl compared to those with cell counts >or= 350 cells/microl) and HIV RNA levels >or= 5 log10 copies/ml (P = 0.0008). Those with AIDS at the time of starting HAART had a less rapid relative decline in incidence (P = 0.0007).
  
  
  CONCLUSIONS
  Our results suggest that some groups may experience less rapid relative declines in AIDS incidence than others over the first year on HAART.
authors.affiliation: Department of Primary Care and Population Sciences, Royal Free and UC Medical School, London, UK. c.sabin@pcps.ucl.ac.uk
authors.forename: C
authors.initials: C
authors.lastname: Sabine
mesh_terms: D017088:AIDS-Related Opportunistic Infections / Q000150:complications / Q000276:immunology*; D000163:Acquired Immunodeficiency Syndrome / Q000150:complications / Q000188:drug therapy; D000328:Adult; D023241:Antiretroviral Therapy, Highly Active / Q000379:methods*; D018791:CD4 Lymphocyte Count; D015331:Cohort Studies; D005260:Female; D017320:HIV Protease Inhibitors / Q000627:therapeutic use; D018451:Homosexuality, Male; D006801:Humans; D008297:Male; D012367:RNA, Viral / Q000032:analysis; D018894:Reverse Transcriptase Inhibitors / Q000627:therapeutic use; D012307:Risk Factors; D015819:Substance Abuse, Intravenous / Q000150:complications / Q000276:immunology; D016896:Treatment Outcome
chemical_list: D017320:HIV Protease Inhibitors; D012367:RNA, Viral; D018894:Reverse Transcriptase Inhibitors