Abstract
Objective
Two recent analyses found that exposure to protease inhibitors (PIs) in the context of antiretroviral (ARV) therapy increased the risk for distal sensory polyneuropathy (DSPN) in subjects with human immunodeficiency virus (HIV) infection. These findings were supported by an in vitro model in which PI exposure produced neurite retraction and process loss in dorsal root ganglion sensory neurons. Confirmation of peripheral nerve toxicity with PIs could substantially limit their longβterm use in highly active ARV therapy.
Methods
We evaluated current and past exposure to PIs as a risk factor for DSPN in 1,159 HIVβinfected individuals enrolled in a large, prospective, observational, multicenter study. Signs of DSPN were ascertained by neurological examination. Subjects were grouped into categories according to past and current exposure to any ARV and to PIs. We included disease indicators such as nadir CD4, plasma viral load, and duration of HIV infection, as well as advancing age and exposure to dideoxynucleoside ARVs in multivariate models.
Results
In univariate analyses, both past and current PI exposure significantly increased the risk for DSPN. However, after adjusting for previously validated concomitant risk factors in multivariate models, none of the PI exposure groups was more likely to have DSPN than ARV naive subjects. A secondary evaluation of duration of PI use and exposure to individual PI drugs was similarly nonsignificant in multivariate models, except for small effects of amprenavir and lopinavir.
Interpretation
Evaluation of concomitant risks for HIV DSPN suggests that the independent risk attributable to PIs, if any, is small. This risk must be weighed against the important role of PIs in modern ARV therapy regimens. Ann Neurol 2008;64:566β572