Persistent low level viraemia on third line ART

Transcription

1 Persistent low level viraemia on third line ART Dr Richard Lessells XXVII International workshop on HIV drug resistance and treatment strategies October 2018

2 46-year old HIV-positive female HIV diagnosis 2006 Pre-treatment CD4+ count 160 cells/µl First-line ART d4t/3tc/nvp Second-line ART TDF/3TC/LPVr

3 * Genotype

4 Antiretroviral experience: d4t, 3TC, TDF, NVP, LPVr Subtype: HIV-1 Subtype C Resistance interpretations: HIVdb Drug Mutations Description Score Zidovudine D67N,T69D, K70R, M184V, K219Q Intermediate resistance 55 Abacavir D67N, T69D, K70R, M184V, K219Q High-level resistance 60 Tenofovir D67N, T69D, K70R, M184V, K219Q Low-level resistance 15 Lamivudine D67N, T69D, K70R, M184V, K219Q High-level resistance 70 Emtricitabine D67N, T69D, K70R, M184V, K219Q High-level resistance 70 Nevirapine Y181C High-level resistance 60 Efavirenz Y181C Intermediate resistance 30 Etravirine Y181C Intermediate resistance 30 Rilpivirine Y181C Intermediate resistance 45 Lopinavir/r L10F, M46I, I54V, A71V, L76V, V82A High-level resistance 120 Atazanavir/r L10F, M46I, I54V, A71V, L76V, V82A High-level resistance 60 Darunavir/r L10F, M46I, I54V, A71V, L76V, V82A Low-level resistance 25

5 Third-line ART algorithm PI score 15 DRV/r + 3TC or FTC + AZT or TDF TDF/AZT 30 or DRV/r 15 TDF/AZT 30 and DRV/r 15 And ETR <30 Add RAL/DTG Add ETR DRV/r RAL FTC/TDF

6 Antiretroviral experience: d4t, 3TC, TDF, NVP, LPVr Subtype: HIV-1 Subtype C Resistance interpretations: HIVdb Drug Mutations Description Score Zidovudine D67N,T69D, K70R, M184V, K219Q Intermediate resistance 55 Abacavir D67N, T69D, K70R, M184V, K219Q High-level resistance 60 Tenofovir D67N, T69D, K70R, M184V, K219Q Low-level resistance 15 Lamivudine D67N, T69D, K70R, M184V, K219Q High-level resistance 70 Emtricitabine D67N, T69D, K70R, M184V, K219Q High-level resistance 70 Nevirapine Y181C High-level resistance 60 Efavirenz Y181C Intermediate resistance 30 Etravirine Y181C Intermediate resistance 30 Rilpivirine Y181C Intermediate resistance 45 Lopinavir/r L10F, M46I, I54V, A71V, L76V, V82A High-level resistance 120 Atazanavir/r L10F, M46I, I54V, A71V, L76V, V82A High-level resistance 60 Darunavir/r L10F, M46I, I54V, A71V, L76V, V82A Low-level resistance 25

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9 Clinical assessment Adherence Subjective and objective assessment excellent adherence Takes ARVs 0900 & 2100 Uses cell phone alarm as reminder Niece also often reminds her to take ARVs Only person on ARVs at home, but disclosed to all household members Note MCV 111 (cf. 88 prior to AZT introduction) Tolerability/toxicity No problem swallowing pills (ARV total pill burden - 9 pills) No reported side-effects Significant weight gain (~10 kg on third-line ART 75kg to 85kg) Lipodystrophy (dating back at least to second-line ART regimen)

10 Clinical assessment Comorbidities Lipodystrophy (first documented 2012, abdominal girth) Hypertension 2014 Genital warts (Rx podophyllin) 2014 Right salpingo-oophorectomy (haemorrhagic corpus luteum cyst) 2016 Avascular necrosis & osteoarthritis left talus (ankle) 2017 Persistent microscopic haematuria (awaiting urology review) since 2014 Polypharmacy Hypertension hydrochlorothiazide, enalapril, amlodipine Analgesia Tramadol, amitriptyline, carbamazepine Total pill burden (ARVs & others) at least 19 pills per day

11 Potential drug-drug interactions Tenofovir Hydrochlorothiazide Enalapril Lamivudine Amlodipine? Raltegravir Darunavir/ritonavir Potential interaction (UGT1A1) Tramadol Amitriptyline Carbamazepine

12 What would you do now? A. Send plasma sample for genotypic resistance testing B. Check drug levels for raltegravir & darunavir C. Substitute RAL DTG 50mg bd (TDF/FTC/AZT/DTG/DRV/r) D. Switch to TLD E. Add etravirine (TDF/FTC/AZT/RAL/ETR/DRV/r) F. Lumbar puncture for CSF viral load ± genotypic resistance testing G. Continue current regimen & stop checking viral loads so frequently

13 South African guidelines Low-level viraemia Department of Health National Consolidated Guidelines VL threshold for regimen switch >1000 copies/ml on all regimens - VL prompts adherence assessment & 6-monthly VL - No other specific guidance on low-level viraemia Southern African HIV Clinicians Society Guidelines If patients have low-level viraemia (VL detectable but <1000 copies/ml) on first-line ART for a prolonged period (>1 year), or persistently low CD4+ counts (<100 cells/µl) together with LLV despite adherence interventions, then they should be switched to second-line ART

14 Monitoring of patients with low-level viraemia British HIV Association Guidelines 2016

15 Detection of resistance with low-level viraemia IAS-USA Panel 2018 Recommendations (Günthard et al. Clin Infect Dis 2018)

16 What would you do now? A. Send plasma sample for genotypic resistance testing B. Check drug levels for raltegravir & darunavir C. Substitute RAL DTG 50mg bd (TDF/FTC/AZT/DTG/DRV/r) D. Switch to TLD E. Add etravirine (TDF/FTC/AZT/RAL/ETR/DRV/r) F. Lumbar puncture for CSF viral load ± genotypic resistance testing G. Continue current regimen & stop checking viral loads so frequently

17 Other questions for discussion 1. If delays in process of accessing third-line ART, should we ever consider repeat genotypic resistance testing? 2. Should we be proactive and get all patients on RAL-containing thirdline regimens onto DTG? 3. Should we be developing laboratory capacity in the region for genotyping at viral loads <1000 copies/ml? 4. What studies need to be done to evaluate regimens for people failing third-line ART in LMIC?

18 Acknowledgements The CAPRISA Advanced Clinical Care (ACC) Programme was supported by the Grant or Cooperative Agreement Number U2G GH001142, funded by the Centers for Disease Control and Prevention. The contents are solely the responsibility of the presenters and do not necessarily represent the official views of the U.S. Centers for Disease Control and Prevention or the U.S. Department of Health and Human Services