HIV and ID Observations

As expected, there’s a new single pill regimen for HIV, this one containing abacavir (ABC)/lamivudine (3TC)/dolutegravir (DTG), and it’s called Triumeq.

(Where oh where do companies get these names?)

A few thoughts/comments:

• The most important study for this combination was the SINGLE study, which showed that ABC/3TC + DTG (given as two pills) was superior to TDF/FTC/EFV (given as one), the difference based primarily on tolerability advantage of the former. It was a novel double-blind study, as all three drugs were different in each treatment arm.
• Another benefit DTG-based regimens — whether given with ABC/3TC or TDF/FTC as separate pills — is that to date, no treatment-naive patient with virologic failure has developed resistance to DTG. I suspect it will happen one of these days, but the data thus far suggest at the very least DTG resistance will be a rare event.
• Needless to say, but will say it anyway for emphasis, all patients starting this regimen will need to be tested for HLA-B*5701 and found to be negative. Wonder if pharmacies will enforce this, or whether it will be left up to the prescribers. Here’s the landmark study that proved this testing essentially excludes severe hypersensitivity to ABC, quite an amazing story in pharmacogenomics.
• An unresolved question is whether ABC is associated with an increased risk of cardiovascular disease. This FDA meta analysis of randomized clinical trials didn’t think so, but around half of the observational studies did, including the updated DAD study. NA-ACCORD data will be of great interest, whenever they appear.
• As of Sunday, August 24, the price of ABC/3TC/DTG is not known (at least to me) — and it could be a real game changer, since both ABC and 3TC are already generic. Says Ben Young over on TheBody: “If ViiV Healthcare manages to set the price of Triumeq in accordance with the generic status of abacavir and lamivudine, the cost should be substantially lower than the price of the other single-tablet regimens that contain all on-patent components.” Yep.
• I suspect people will call it “Trii” (rhymes with “Cy”, as in “Cy Young”) for a while, just like they called TDF/FTC/EVG/COBI “Quad”.

So what are some upcoming single-tablet regimens? Tenofovir alafenamide (TAF) with FTC/EVG/COBI. TAF/FTC/DRV/COBI. DTG/rilpivirine. And inevitably, generic TDF/3TC/EFV, which is widely available globally.

Regardless, sure beats the old days.