title: Use of CD4 lymphocyte count to predict long-term survival free of AIDS after HIV infection.
abstract: OBJECTIVE
  To estimate the probability of remaining free of AIDS for up to 25 years after infection with HIV by extrapolation of changes in CD4 lymphocyte count.
  
  
  METHODS
  Cohort study of subjects followed from time of HIV seroconversion until 1 January 1993. Creation of model by using extrapolated linear regression slopes of CD4 count to predict development of AIDS after 1993.
  
  
  METHODS
  Regional haemophilia centre in teaching hospital.
  
  
  METHODS
  111 men with haemophilia infected with HIV during 1979-85. Median length of follow up 10.1 years, median number of CD4 counts 17. The model was not fitted for three men because only one CD4 measurement was available.
  
  
  METHODS
  Development of AIDS.
  
  
  METHODS
  From 1989 prophylaxis against candida and Pneumocystis carinii pneumonia and antiretroviral drugs when CD4 count fell below 200 x 10(6)/l.
  
  
  RESULTS
  44 men developed AIDS up to 1 January 1993. When AIDS was defined as a CD4 count of 50 x 10(6)/l the model predicted that 25% (95% confidence interval 16% to 34%) would survive for 20 years after seroconversion and 18% (11% to 25%) for 25 years. Changing the CD4 count at which AIDS was assumed to occur did not alter the results. Younger patients had a higher chance of 20 year survival than older patients (32% (12% to 52%) for those aged < 15, 26% (14% to 38%) for those aged 15-29, and 15% (0% to 31%) for those aged > or = 30).
  
  
  CONCLUSIONS
  These results suggest that even with currently available treatment up to a quarter of patients with HIV infection will survive for 20 years after seroconversion without developing AIDS.
authors.affiliation: University Department of Public Health, Royal Free Hospital and School of Medicine, London.
authors.forename: A N
authors.initials: AN
authors.lastname: Phillips
authors.forename: C A
authors.initials: CA
authors.lastname: Sabin
authors.forename: J
authors.initials: J
authors.lastname: Elford
authors.forename: M
authors.initials: M
authors.lastname: Bofill
authors.forename: G
authors.initials: G
authors.lastname: Janossy
authors.forename: C A
authors.initials: CA
authors.lastname: Lee
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000097:blood / Q000401:mortality*; D000293:Adolescent; D000328:Adult; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D002177:Candidiasis / Q000517:prevention & control; D015331:Cohort Studies; D006679:HIV Seropositivity / Q000097:blood*; D015497:HIV-1 / Q000276:immunology; D006467:Hemophilia A / Q000150:complications; D006801:Humans; D007958:Leukocyte Count; D016015:Logistic Models; D008131:London / Q000453:epidemiology; D008297:Male; D011020:Pneumonia, Pneumocystis / Q000517:prevention & control; D012680:Sensitivity and Specificity; D016019:Survival Analysis; D013997:Time Factors; D015215:Zidovudine / Q000627:therapeutic use
chemical_list: D015215:Zidovudine