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Response from Dr. Pierone

I don't think that we fully know the answer to your question.
In the SWEET study switching AZT to Viread did lead to improved body fat when in patients who had been on AZT for less than 3 years, but not in patients who had been on AZT for longer periods. But these differences were measured one year after the switch, so perhaps the patients on long-term AZT might need a longer period of time to rebuild fat stores. We really don't know.
We know from other studies that fat cells are injured by AZT and d4T and presumably some become so damaged that they die. Whether these dead fat cells are replaced by new ones is not known. However, my observation has been that some patients with well established lipoatrophy may not notice improvement even if they go off antiretroviral therapy altogether or switch to nuke-sparing regimens. This would imply that the capacity for fat cell replenishment is limited, at least for some individuals.
With regard to the face, Sculptra and other fillers don't replace fat cells, but can certainly increase facial fullness and produce results that are indistinguishable from facial fat restoration.
Finally, fat grafting is currently an imperfect science and results are decidedly mixed. Some people get wonderful results, others the opposite. But given the pace of medical progress, it is not unrealistic to think that one day we will be able to harvest some fat cells from an individual, expand them in a petri dish, and then graft them back to areas that need fat restoration.
I hope that this information helps and best of luck to you!
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