Do you happen to know the fraction of the HIV market which involves treatment-naive patients?
Given that most treated patients now live for decades but begin to resist at least one of their therapies within a few years, my guess would be that it is well below 50% and shrinking.
In 4Q07, Atripla’s US Rx share in the first line rose to 55% (from 53% in the pie chart in #msg-25102913), while GILD’s overall share of US Rx’s in the first line remained close to 80%.
In the overall US market (first line plus later lines), Atripla’s Rx share is now 25% and GILD's overall share of RX's is 65%.