Interesting case discussion! The results of the NADIA and VISEND trials both included people with this specific NRTI resistance profile (M184V and K64R) randomized to TAF/FTC with either DTG or DRVr and those in the DRV arm had > 90% suppression of viral load (similar to the DTG arm). Those in the DRV arm who did experience virologic failure did not have development of treatment-emergent resistance to DRV. This of course makes sense with what we know about PI-based resistance (i.e. that most DRV resistance actually developed from failing amprenavir and fosamprenavir regimens). So honestly in this case I would feel fine with Symtuza alone with close follow up. Should he fail, the DRV should remain fully active in a recycled regimen.
I think prior to the results of NADIA and VISEND I would agree that adding another agent to TAF/FTC/DRVc would be prudent. I'd be interested to know more about his specific NNRTI mutations as ETR may remain fully active even if there is resistance to DOR or RPV, neither of which are studied in people with histories of NNRTI failures. Of the novel MOA agents agree that starting with fostemsavir makes the best sense since based on current data if the patient is X4 tropic, though if R5 tropic would prefer to start with maraviroc.
Joshua St. Louis
Original Message:
Sent: 08-16-2023 17:07
From: Ashwin Gupta
Subject: K65R + M184V with possible pan insti resistance
Hi Adam (and Stephen, James, Jacob, Alexander) and every one else. Sorry for such a late reply;
I have some updates
(1) phenosense with trofile is pending
(2) for the case discussion -- I was able to review chart data and past genos from a previous ID provider outside of my current health system---- he has/had DOR resistance and RPV resistance in the past! womp wompp
(3) I was very interested in everyone's thoughts about DOR vs RPV; which NNRTI would be people's preference in a setting of non-NNRTI resistance. Seems there's agreement that DOR may be more preferable to RPV
In this case, I was left with DRV/c/T/F + fostemsavir: 3 total pills a day (1 qD and 1BID). I agree this increases the bill burden and dietary needs, not amazing.
I am hopeful this will be the consistent and best regimen for this person.
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Ashwin Gupta
Philadelphia PA
Original Message:
Sent: 08-07-2023 11:42
From: Adam Zweig
Subject: K65R + M184V with possible pan insti resistance
Hi Stephen,
Why would you be leary of using lenacapavir? You are worried about a lower barrier to resistance and him missing every six month doses? But, I personally worry more about the increased pill burden of fostemsavir, since it is a BID drug. Anyway, many ways to go here.
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Adam Zweig
AIDS Healthcare Foundation
San Diego CA
Original Message:
Sent: 08-06-2023 14:42
From: Stephen Adams
Subject: K65R + M184V with possible pan insti resistance
You could use fostemsavir instead of the DOR. With his noncompliance history I'd be very Leary of using Lenacaprivir.
Sent from my iPad
Stephen R Adams, MD
Original Message:
Sent: 8/4/2023 12:41:00 PM
From: Ashwin Gupta
Subject: K65R + M184V with possible pan insti resistance
Hi all,
Just a bit curious what others would do in this situation:
44yo male, MSM.
Newer patient to practice from an mpx diagnosis through ED in 12/22; subsequently new linkage to care with our team for HIV starting in March after LTFU s/p completion of TPOXX. Pt states off ART completely for 5+ months. Genotyping conducted on that first linked-to-care HIV appt showing pan-susceptibility, VL 1740 . Pt states hx of several various HIV offices in the surrounding area since 2013 dx along with many ART combinations (some previous ART: epizom, DTG+Tdf/F, RTV+TDF, DRV/c+doravirine). Patient rescreened at next appointment in May 2023, VL of 299 with BIC/T/F. 1 week later, enrolled in a research study and re-screened; genotyping showing pan insti resistance, K65R and M184V. VL 12,300.
Patient asked about medication adherence, stating daily only 1 missed dose over the last 1-2 months.
At this point, we have pan-PI and pan NNRTI susceptibility.
Engaging with patient, explained he will need to be prepared for a switch off STR, and will likely need two tablets per day.
Newest VL now 30,400.... don't yell at me, I collected a phenosense in anticipation of a VL increase.
I will have to take him off BIC/T/F obviously, but what kind of regimens are people using with K65R+M184V (and Y115F but I wasn't considering ABC for the future, anyway). The geno is predicting pan INSTI resistance (Q148R, E138K).
I'm leaning towards DRV/Cobi/T/F + DOR
Any thoughts or advice appreciated!
-A
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Ashwin Gupta
Philadelphia PA
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