Gender differences in virologic response to treatment in an HIV-positive population: a cohort study.
OBJECTIVE
To establish whether a gender difference in virologic response to highly active antiretroviral treatment (HAART) exists.


METHODS
A cohort of HIV-positive individuals was examined.


RESULTS
Achievement of viral load <500 copies/ml and "failure" (failure to suppress viral load <500 copies/ml after 24 weeks or two consecutive measurements above this level after having suppressed below it). Hazard ratios (HRs) comparing the rate in women to that in men were derived using the Cox model.


RESULTS
Of 366 male subjects, 79% were white and 82% were homosexual. Sixty-three percent of the 91 female subjects were African and 87% were heterosexual. The median follow-up after HAART was 94 weeks. The baseline CD4 count was higher in men (228 x 106 per liter) than in women (171 x 106 per liter) (p =.01), but the viral load was similar (p =.88). The median time to <500 copies/ml was 16 weeks. Women achieved a viral load of <500 copies/ml at a faster rate than men, with an adjusted HR of 1.46 (95% confidence interval [CI]: 0.99-2.16; p =.06). Some 261 patients failed treatment (58% of men and 53% of women) with an HR of 0.78 (95% CI: 0.51-1.21; p =.27).


CONCLUSIONS
Women may achieve virologic suppression at a faster rate than men and have a more durable response. Further research should examine these responses in conjunction with clinical outcomes, because gender differences in virologic response may ultimately be of little relevance if clinical outcomes are similar.
Royal Free Centre for HIV Medicine and Department of Primary Care and Population Sciences, Royal Free and University College Medical School, Hampstead, London, United Kingdom. rfpc0025@rfhsm.ac.uk
A L
AL
Moore
A
A
Mocroft
S
S
Madge
H
H
Devereux
D
D
Wilson
A N
AN
Phillips
M
M
Johnson
D000328:Adult; D019380:Anti-HIV Agents / Q000627:therapeutic use*; D023241:Antiretroviral Therapy, Highly Active; D018791:CD4 Lymphocyte Count; D015331:Cohort Studies; D005260:Female; D006679:HIV Seropositivity / Q000188:drug therapy* / Q000276:immunology / Q000821:virology; D015497:HIV-1 / Q000187:drug effects; D006801:Humans; D008297:Male; D015999:Multivariate Analysis; D012367:RNA, Viral / Q000032:analysis; D012737:Sex Factors; D016896:Treatment Outcome; D019562:Viral Load
D019380:Anti-HIV Agents; D012367:RNA, Viral