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. 2017 Jul 27;31(13):1853–1858. doi: 10.1097/QAD.0000000000001590

Adverse events of raltegravir and dolutegravir

Luigia Elzi a,, Stefan Erb b,, Hansjakob Furrer c, Matthias Cavassini d, Alexandra Calmy e, Pietro Vernazza f, Huldrych Günthard g,h, Enos Bernasconi i, Manuel Battegay b, for the Swiss HIV Cohort Study Group
PMCID: PMC5566167  PMID: 28692533

Abstract

Objective:

To compare the frequency and risk factors of toxicity-related treatment discontinuations between raltegravir and dolutegravir.

Design:

Prospective cohort study.

Methods:

All antiretroviral therapy (ART)-naïve and ART-experienced HIV-infected individuals from the Swiss HIV Cohort Study who initiated raltegravir or dolutegravir between 2006 and 2015 were investigated concerning treatment modification within the first year.

Results:

Of 4041 patients initiating ART containing raltegravir (n = 2091) or dolutegravir (n = 1950), 568 patients discontinued ART during the first year, corresponding to a rate of 15.5 [95% confidence interval (CI) 14.5–16.9] discontinuations per 100 patient-years. Only 10 patients on raltegravir (0.5%) and two patients on dolutegravir (0.1%) demonstrated virologic failure. The main reason for ART discontinuation was convenience expressed as patient's wish, physician's decision, or treatment simplification (n = 302). Toxicity occurred in 4.3% of patients treated with raltegravir and 3.6% with dolutegravir, respectively. In multivariable analysis, the only independent risk factor for discontinuing ART because of toxicity was female sex (hazard ratio 1.98, 95% CI 1.45–2.71, P < 0.001).

Neuropsychiatric complaints were the most commonly reported toxic adverse events and more frequent in the dolutegravir (n = 33, 1.7%) compared with the raltegravir group (n = 13, 0.6%). Risk of discontinuation for neurotoxicity was lower for raltegravir than for dolutegravir in multivariable analysis (hazard ratio 0.46, 95% CI 0.22–0.96, P = 0.037).

Conclusion:

In this, large cohort raltegravir and dolutegravir-containing regimen demonstrated a high virologic efficacy. Drug toxicity was infrequent and discontinuation because of neuropsychiatric events within the first year of treatment was only marginal higher with dolutegravir compared with raltegravir. However, monitoring of neurotoxic side-effects of dolutegravir is important.

Keywords: dolutegravir, HIV, neuropsychiatric adverse events, raltegravir, toxicity

Introduction

Raltegravir and dolutegravir are currently among the most commonly used integrase strand transfer inhibitors (INSTI), which are part of preferred antiretroviral therapy (ART) regimens according to various guideline boards such as the International AIDS Society and the European AIDS Clinical Society [1,2]. Both agents show a very high antiretroviral potency and, in particular for dolutegravir, a very low risk of virologic failure and development of drug-associated resistance. Further beneficial characteristics of both INSTIs are the excellent tolerability, the low interaction potential as well as the excellent penetration into the central nervous system [3,4,5,6]. No specific organ toxicity associated with raltegravir and dolutegravir was identified in randomized clinical trials. Owing to these favorable characteristics, the once-daily administration, and the low dosage allowing for fixed-dosed combination, the use of dolutegravir in the treatment of HIV-infected patients has rapidly increased since the approval in 2013.

However, recent reports, mainly from retrospective data and smaller cohorts, raised concerns about the safety of dolutegravir in real-life settings with higher than expected discontinuation rates, particularly in respect of neuropsychiatric adverse events [79,10].

The aim of our study was to compare the frequency and risk factors of discontinuation between dolutegravir and raltegravir because of any reason and more specifically because of toxicity adverse events in a large cohort of HIV-infected individuals.

Methods

Study setting

We analysed the Swiss HIV Cohort Study (SHCS) database, a large prospective and ongoing cohort study in Switzerland with continuous enrolment of HIV-infected individuals of 16 years or older. In the SHCS, basic sociodemographic characteristics, clinical course, ART, reasons for discontinuation or change of the ART regime, comedication, immunological, and virological data as well as information on comorbidity and coinfections are collected at registration into the study and every 6 months thereafter on standardized protocols. For the present analysis we used SHCS database update of January 2017.

Study population

All HIV-infected individuals participating in the SHCS starting an antiretroviral regime containing raltegravir or dolutegravir combined with appropriate backbone between 1 April 2006 and 31 December 2015 and who had a follow-up of at least 12 months were eligible for this study.

Definitions

Treatment modification was defined as discontinuation or switch of ART within the first year of treatment. Discontinuation was defined as stopping dolutegravir or raltegravir for at least 4 weeks. A switch to another regimen was defined as changing one or more drugs within 4 weeks after stopping ART. The main reason for treatment modification was classified as treatment failure, intolerance, and/or toxic effects, the patient's choice, the physician's decision, and other reasons. Since 2014 more detailed reasons for drug discontinuation were introduced and prospectively collected in the SHCS database, including treatment simplification, concerns about drug interactions and adherence. Toxicity, predominantly from the nervous system was specifically coded detailed as neuropsychiatric toxicity, headache, or peripheral neuropathy.

Statistical analysis

The primary endpoint was the time to first treatment modification (i.e., switch to another antiretroviral regime or discontinuation) during the first year of treatment. Basic sociodemographic characteristics, CD4+ cell counts, HIV RNA, and ART were compared using the χ2 test for categorical and Mann–Whitney U or Kruskal–Wallis test for continuous variables. We used Kaplan–Meier curves to describe the cumulative incidence of treatment modification according to either raltegravir or dolutegravir-containing ART regimen, and the curves were compared using log-rank tests. Uni and multivariable Cox regression analysis was used to investigate risk factors for treatment modification because of any reason and because of adverse events. The following variables were assessed: sex, age, ethnicity, prior AIDS-defining condition, hepatitis C virus coinfection, CD4+ cell count, HIV RNA, treatment status, ART backbone (abacavir–lamivudine versus tenofovir–emtricitabine versus other) and INSTI (raltegravir versus dolutegravir).

All patients were censored at 1 year after starting ART if no treatment modification or death had occurred. P values < 0.05 were considered statistically significant. All analyses were performed using commercially available software (STATA, version 13.1 for Windows, StataCorp, College Station, Texas, USA).

Results

During the study period from 1 April 2006 to 31 December 2015, 4041 HIV-infected individuals participating in the SHCS started an antiretroviral regimen containing either raltegravir (n = 2091) or dolutegravir (n = 1950). Baseline characteristics are shown in Table 1. Dolutegravir was mostly combined with abacavir–lamivudine in a single-tablet regimen in comparison with raltegravir being most often combined with tenofovir–emtricitabine.

Table 1. Baseline characteristics of the study population with raltegravir and dolutegravir containing antiretroviral regimen (n = 4041) and reasons for treatment modification.

Raltegravir N = 2091 Dolutegravir N = 1950
n % n % P value
Male 1474 70.5 1455 74.6 0.003
Age, median (IQR) 48 41–54 48 40–54 0.447
White ethnicity 1752 83.8 1566 80.3 0.004
Risk
 MSM 887 42.4 997 51.1
 Heterosexual 723 34.6 679 34.8 <0.001
 PWID 245 11.7 107 5.5
 Other 236 11.3 167 8.6
Prior AIDS-defining condition 623 29.8 381 19.5 <0.001
HCV coinfection 641 30.7 377 19.3 0.001
CD4+ cells per μl
 <350 713 34.1 341 17.5 <0.001
 350–500 481 23.0 421 21.6
 >500 897 42.9 1188 60.9
HIV RNA >100 000 copies per ml 574 42.8 608 39.4 0.069
Treatment-naive 188 9.0 327 16.8 <0.001
Backbone
 Abacavir–lamivudine 302 14.5 1149 59.1 <0.001
 Tenofovir–emtricitabine 955 45.7 586 30.1
 Other 833 39.9 209 10.8
Treatment modification 364 17.4 204 10.5 <0.0001
 Treatment failure 10 0.48 2 0.10 0.028
 Toxicity
  Total 106 5.07 75 3.85 0.060
  Gastrointestinal 6 0.29 19 0.97 0.005
  Liver 2 0.10 7 0.36 0.098
  Lipids 12 0.57 1 0.05 0.003
  Neuropsychiatric 13 0.62 33 1.69 0.001
  Kidney 3 0.14 0 0.00 0.251
  Hematologic 9 0.43 2 0.10 0.046
  Allergy 16 0.77 4 0.21 0.011
  IRIS 6 0.29 1 0.05 0.076
  Other 39 1.87 8 0.41 <0.0001
 Convenience
  Total 210 10.04 92 4.72 <0.0001
  Patient's wish 54 2.58 44 2.26 0.502
  Physician's decision 94 4.50 26 1.33 <0.0001
  Treatment simplification 62 2.97 22 1.13 <0.0001
 Pregnancy 3 0.14 11 0.56 0.023
 Other 25 2.97 18 1.13 0.399
 No information 10 0.48 6 0.31 0.390

IQR, interquartile range; IRIS, immune reconstitution inflammatory syndrome; PWID, people who inject drugs.

Of 4041 patients included in this study, 568 (14.1%) patients had modification of their ART because of any reason during the first year of treatment, corresponding to 15.5 [95% confidence interval (CI) 14.5–16.9] discontinuations per 100 patient-years. Among them, 364 (17.4%) patients were treated with raltegravir and 204 (10.5%) with dolutegravir (Table 1).

The main reason for treatment modification was convenience (n = 302) expressed by the patient's wish, physician's decision or treatment simplification, followed by toxicity or intolerance (n = 181). Only 10 patients under raltegravir (0.48%) and two patients under dolutegravir (0.10%) demonstrated virological failure (Table 1).

In multivariable analysis, risk factors of ART modification within the first year of treatment regardless of the main reason were female sex (hazard ratio 1.28, 95% CI 1.06–1.53, P = 0.009), younger age (hazard ratio 0.90, 95% CI 0.83–0.98 per 10 years older, P = 0.011), HIV RNA more than 100 000 copies per ml at baseline (hazard ratio 1.49, 95% CI 1.09–2.02, P = 0.011), and starting a raltegravir-containing regime (hazard ratio 1.71, 95% CI 1.38–2.08, P < 0.001; S1 Table. Supplementary material). Among pregnant women, those treated with dolutegravir were more likely to discontinue ART compared with those treated with raltegravir. However, this difference was not statistically significant (P = 0.205).

Adverse events leading to ART modification within the first year occurred in 4.5% of the patients, corresponding to a discontinuation rate of 4.4 (95% CI 3.6–5.5) per 100 patient-years for dolutegravir and 5.7 (95% 4.7–6.9) per 100 patient-years for raltegravir. This difference did not reach statistical significance (P = 0.11). In multivariate analysis, the only independent risk factor for ART modification because of toxicity was female sex (hazard ratio 1.98, 95% CI 1.45–2.71, P < 0.001; Table 2).

Table 2. Risk factors of modification of an antiretroviral regimen containing raltegravir versus dolutegravir within the first year of treatment because of toxicity or intolerance.

Univariate analysis Multivariate analysis
Variable HR 95% CI P value HRa 95% CI P value
Female 1.86 1.39–2.49 <0.001 1.98 1.45–2.71 <0.001
Age, per 10 years older 0.91 0.80–1.04 0.156 0.93 0.81–1.07 0.319
Nonwhite ethnicity 1.00 0.69–1.46 0.986 0.75 0.50–1.13 0.172
Prior AIDS-defining condition 0.86 0.61–1.22 0.405 0.89 0.56–1.41 0.513
HCV-coinfection 0.90 0.64–1.26 0.538 0.80 0.56–1.14 0.221
CD4+ cells per μl
 <350 Reference Reference
 350–500 0.89 0.58–1.35 0.573 0.98 0.63–1.49 0.880
 >500 0.98 0.70–1.39 0.922 1.07 0.73–1.56 0.735
HIV RNA >100 000 copies per ml 1.45 0.87–2.42 0.157 1.53 0.86–2.71 0.149
Treatment naive 1.07 0.70–1.64 0.739 1.05 0.64–1.70 0.858
Backbone
 Abacavir–lamivudine Reference Reference
 Tenofovir–emtricitabine 1.05 0.75–1.47 0.773 0.91 0.63–1.32 0.626
 Other 1.07 0.74–1.55 0.701 0.97 0.64–1.49 0.902
Raltegravir versus dolutegravir 1.27 0.95–1.70 0.106 1.30 0.92–1.84 0.140

Hazard ratios in univariate and multivariate analysis.

CI, confidence interval; HR, hazard ratio.

aadjusted for all variables listed.

Neuropsychiatric complaints, although observed in less than 2% of the patients, were the most commonly reported toxicity adverse events and more frequently in the dolutegravir group [discontinuation rate of 1.83 (95% CI 1.30–2.57) per 100 patient-years] compared with the raltegravir group [discontinuation rate of 0.70 (95% CI 0.41–1.21) per 100 patient-years, P = 0.002]. In multivariable analysis of the subgroup with neurotoxicity, there was a lower risk of discontinuation for raltegravir compared with dolutegravir (hazard ratio 0.46, 95% CI 0.22–0.96, P = 0.037; S2 Table. supplementary material).

Gastrointestinal adverse events were the second most common reason for ART modification and reported in 19 dolutegravir-treated patients and only in six patients under raltegravir. Allergies and lipid disorders as reason for ART modification were more frequent in raltegravir (16 and 12, respectively) than dolutegravir (four and one, respectively) patients. There were only seven immune reconstitution syndrome events after initiation of a INSTI-containing regimen, six in the raltegravir group and one in the dolutegravir group (P = 0.076) (Table 1).

Discussion

The large study, involving 4041 HIV-individuals who have started a raltegravir or dolutegravir-containing ART within the SHCS, illustrates in a real-life setting an overall low rate of ART modification because of adverse events or intolerance for both INSTIs (<5%). The rate of neuropsychiatric adverse events was very low (<2%). There were higher discontinuation rates of dolutegravir (1.7%) compared with raltegravir (0.6%) because of neuropsychiatric adverse events. The only independent risk factor of discontinuing a raltegravir or dolutegravir containing ART within the first year of treatment because of adverse events was female sex. Importantly, we found an outstanding drug potency with an extremely low rate of treatment failures for both drugs (<0.5% of the patients).

Our results are somewhat in contrast with those recently reported in the literature [79], assigning clearly higher rates of treatment discontinuation because of any adverse events (7.6–13.7%) and neuropsychiatric adverse events (5.6–9.9%) for dolutegravir. One explanation might be the smaller number of patients included in those studies which may contribute to an overestimation of the neuropsychiatric adverse events of dolutegravir. In the study by Hoffmann et al.[9], the rates of neuropsychiatric adverse events leading to discontinuation within 12 months was estimated to be 5.6% for dolutegravir, affecting mainly women and older patients, but only 0.7% for elvitegravir and 1.9% for raltegravir. Results from a Spanish cohort of 2021 HIV-infected individuals treated with INSTIs showed a relatively low discontinuation rate of dolutegravir because of neuropsychiatric complaints (2.7 per 100 patient-years) as well, however, only in patients with an abacavir–lamivudine backbone, but not with tenofovir–emtricitabine [11]. In our study neither sex, age, nor the backbone, was associated with discontinuation of dolutegravir compared with raltegravir because of toxicity of the central nervous system.

Very recent data from a North American cohort including 2180 patients receiving dolutegravir and 917 raltegravir did not show an increased risk of psychiatric disorders or ART discontinuations because of psychiatric adverse events related to the use of dolutegravir, although more patients treated with dolutegravir had a psychiatric disease at baseline [12]. This might be explained by the favorable profile of dolutegravir concerning the risk of drug–drug interactions in patients treated with psychiatric medications as well as the convenience of a one-pill regimen in this particular patient population.

Interestingly, female patients in our study showed a higher risk of INSTI discontinuation because of any toxicity adverse event compared with male patients. If different pharmacokinetics or lower body weight may have contributed to higher rate of INSTI-related adverse events in female patients remains hypothetical. Of note, recently, a correlation between plasma concentration of dolutegravir and neuropsychiatric side-effects was shown in a small set of HIV-infected individuals [13].

The sequential introduction of raltegravir and dolutegravir could have impacted on the probability to discontinue raltegravir when dolutegravir was available as alternative ART compound since 2013. After 2013, most patients started ART-containing dolutegravir (n = 1944, 79%) compared with raltegravir (n = 516, 21%). However, we did not find any difference among multivariate models of the probability to discontinue the integrase inhibitor regardless of the main reason and because of neuropsychiatric side-effects when analyses were restricted to the time period before and after 2013.

Our study has some important limitations: information bias might have occurred, as imprecise coding of the reasons for discontinuation of the ART regime cannot be excluded. However, in case of specific symptoms/adverse effects, the proper reason is relatively easy to capture. The reasons for discontinuation are collected by predefined codes in the SHCS database; thus, more detailed information are lacking. Precise descriptions of the particular symptoms and data of minor side-effects not leading to discontinuation of the ART are not available. Therefore, the real burden of all neuropsychiatric events (including minor events) might be underestimated. Only toxicity data leading to the discontinuation of the ART regime are collected in the SHCS database, which, however, represents a highly valuable and representative endpoint. The raltegravir and dolutegravir group differed in some of the baseline characteristics. In addition, other characteristics than those available in the SHCS could have been associated with adverse events. We did not consider data on adherence to treatment for our analysis, and, finally, no data on plasma concentration of INSTI were available for this study.

The main strengths are the large sample size of our study population, the real-life setting, and the prospective collection of patient data including reasons for ART discontinuation.

In conclusion, our study confirms the excellent tolerability of the INSTIs raltegravir and dolutegravir in the treatment of HIV-infected individuals. Raltegravir or dolutegravir drug toxicity is an infrequent reason for treatment modification. Although neuropsychiatric complaints are indeed observed more frequently in patients on dolutegravir compared with raltegravir, in overall these adverse events remain relatively rare. Patient information and monitoring of adverse events are important for early detection of neurotoxicity. In case neuropsychiatric side-effects occur with dolutegravir, a switch to an alternative INSTI remains a valuable option.

Acknowledgements

The authors thank the patients participating in the Swiss HIV Cohort Study (SHCS) for their commitment, the study physicians, and nurses for excellent patient care, and the SHCS laboratories for providing high quality data and the data center for state of the art data management.

The data are gathered by the five Swiss University Hospitals, two Cantonal Hospitals, 15 affiliated hospitals, and 36 private physicians (listed in http://www.shcs.ch/180-health-care-providers).

Members of the SHCS Aubert V, Battegay M, Bernasconi E, Böni J, Braun DL, Bucher HC, Calmy A, Cavassini M, Ciuffi A, Dollenmaier G, Egger M, Elzi L, Fehr J, Fellay J, Furrer H (Chairman of the Clinical and Laboratory Committee), Fux CA, Günthard HF (President of the SHCS), Haerry D (deputy of ‘Positive Council’), Hasse B, Hirsch HH, Hoffmann M, Hösli I, Kahlert C, Kaiser L, Keiser O, Klimkait T, Kouyos RD, Kovari H, Ledergerber B, Martinetti G, Martinez de Tejada B, Marzolini C, Metzner KJ, Müller N, Nicca D, Pantaleo G, Paioni P, Rauch A (Chairman of the Scientific Board), Rudin C (Chairman of the Mother and Child Substudy), Scherrer AU (Head of Data Centre), Schmid P, Speck R, Stöckle M, Tarr P, Trkola A, Vernazza P, Wandeler G, Weber R, Yerly S.

All authors have seen and approved the manuscript and have significantly contributed to the work. M.B. and L.E. conceived the idea for this study. L.E. performed the statistical analysis. M.B., S.E., and L.E. wrote the first draft of the paper. All authors contributed to the overall SHCS study and collection of the data. All authors contributed to the later and final versions of the manuscript.

The study has been financed within the framework of the SHCS, supported by the Swiss National Science Foundation (grant #148522), and by the SHCS research foundation.

Conflicts of interest

S.E. has received educational grants from MSD and Gilead. H.F. has received research grants for his institution from ViiV, Gilead, MDS, BMS, Janssen, and Abbvie. M.C. has received research and travel grants for his institution from ViiV and Gilead. A.C. has received unrestricted educational and research grants from MSD, Gilead and ViiV. P.V. has received fees for his institution for temporary advisory board meetings with pharmaceutical companies including Viiv-Healthcare and MSD. G.H. has received research grants from the Swiss National Science Foundation, SHCS, University of Zurich, Yvonne Jacob Foundation, Gilead Sciences, and Roche; fees for data and safety monitoring board membership from Merck; consulting/advisory board membership fees from Gilead Sciences; and travel reimbursement from Gilead. E.B. has received fees for his institution for participation to advisory board from MSD, Gilead Sciences, ViiV Healthcare, Abbvie, and Janssen. M.B. has received research or educational grants by AbbVie AG, Gilead Sciences Switzerland Sàrl, Janssen-Cilag AG, MSD Merck Sharp and Dohme AG and ViiV Healthcare GmbH.

Supplementary Material

Supplemental Digital Content
aids-31-1853-s001.doc (82KB, doc)

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