This substudy is a prospective, observational, open-label, randomised study within the MARCH
study. The purpose of this substudy is to investigate the changes in cerebral function
parameters at 5 timepoints over 96 weeks of the three different treatment arms within the
MARCH study. The investigators hypothesise that there will be improvements in cerebral
function in those patients randomised, as part of the parent study, into the maraviroc arms.
the assessments in this CNS substudy will include:
1. Neurocognitive function as assessed by a computerised testing battery called CogState;
2. changes in cerebral metabolites as measured via 1H Magnetic Resonance Spectroscopy
(1H-MRS)
In those randomised to the maraviroc arms (arms 2 and 3) there is an optional Lumbar puncture
at week 48. The cerebrospinal fluid will be used to measure maraviroc levels and an
ultrasensitive CSF HIV-1 viral load. These results will be matched with levels in the plasma.