Study Assessing Dolutegravir in HIV-1 Infected Subjects With Virus Resistant to Raltegravir and/or Elivitegravir

ViiV Healthcare30 enrolled

Overview

Study ING116529 is a multicenter, randomized, study with an initial 7 day placebo- controlled, functional monotherapy phase to quantify the antiviral activity attributable to dolutegravir (DTG) in HIV-1 infected, ART-experienced adults who are experiencing virological failure on an Integrase inhibitor containing regimen (current RAL or ELV failures), with evidence of genotypic resistance to RAL or ELV at study entry. Thirty subjects will be randomized (1:1) to receive either DTG 50mg BID (Arm A) or Placebo (Arm B) with the current failing regimen for 7 days (RAL or ELV should be discontinued prior to dosing with DTG). At Day 8, subjects from both arms will enter an open label phase and receive open label DTG 50mg BID with an optimized background regimen containing at least one fully active drug.

Study ING116529 is a multicenter, randomized, study with an initial 7 day placebo-controlled, functional monotherapy phase to assess the antiviral activity and safety of a dolutegravir (DTG, GSK1349572) containing regimen in HIV-1 infected, ART-experienced adults with virological failure on an integrase inhibitor (INI) containing regimen. Subjects must have evidence of genotypic resistance to raltegravir \[RAL\] or elvitegravir \[ELV\] at Screening and documented current or historical genotypic or phenotypic resistance to at least two other antiretroviral therapy drug classes. The study is designed to provide an accurate measure of the intrinsic antiviral activity of DTG 50mg twice daily versus placebo both administered with the current failing regimen in a randomised double-blind phase to Day 8. This will be followed by an open label phase with all subjects receiving DTG 50mg twice daily with an optimized background regimen (containing at least one fully active drug) until subjects no longer derive clinical benefit or until DTG is locally available. Thirty subjects will be randomized (1:1) to receive either DTG 50mg BID (Arm A) or Placebo (Arm B) with the current failing regimen for 7 days (RAL or ELV should be discontinued prior to dosing at Day 1). At Day 8, subjects from both arms will enter an open label phase and receive open label DTG 50mg BID with an optimized background regimen containing at least one fully active drug The primary analysis will be conducted after the last subject enrolled has completed the randomised, double-blind phase at Day 8. Additional analyses may be performed prior to study closure when all ongoing subjects transition to locally available commercial DTG.

Study Type

INTERVENTIONAL

Eligibility

Sex: ALLMin age: 18 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Screening plasma HIV-1 RNA ≥1000 copies/mL * ART-experienced, INI-experienced, DTG naïve * Current virological failure on raltegravir (RAL) or elvitegravir (ELV) regimen * The subject's HIV-1 shows genotypic resistance to RAL or ELV at Screening * Subject has been on stable ART for at least one month prior to Screening and through Day 1(with exceptions for ETV, EFV and NVP that can be interrupted within 14 days of Day 1, see Exclusion Criterion) * Documented resistance to at least one drug from each of two or more of any approved classes of ART other than integrase inhibitors * Be able to receive at least one fully active drug as part of the OBR from Day 8 * Women capable of becoming pregnant must use appropriate contraception during the study (as defined by the protocol) * Willing and able to understand and provide signed and dated written informed consent prior to Screening. Exclusion Criteria: * Women who are pregnant or breast feeding * An active AIDS-defining condition at Screening (except cutaneous Kaposi's sarcoma not requiring systemic therapy or CD4+ \<200c/mm3) * Moderate to severe hepatic impairment as defined by Child-Pugh classification * Anticipated need for HCV therapy during the first 24 weeks of the study * Recent history (less than or equal to 3 months) of any upper or lower gastrointestinal bleed, with the exception of anal or rectal bleeding * Allergy or intolerance to the study drugs or their components or drugs of their class * Malignancy within the past 6 months * Treatment with an HIV-1 therapeutic vaccine within 90 days of Screening * Treatment with radiation therapy, cytotoxic chemotherapeutic agents or any immunomodulator within 28 days of Screening * Treatment with any agent, other than licensed ART, with documented in vitro/vivo activity against HIV-1 within 28 days of first dose of investigational product (with the exception of entecavir if required for Hep B treatment) * Treatment with etravirine, efavirenz, or nevirapine within 14 days of Day 1(etravirine may be used if coadministered with lopinavir/ritonavir or darunavir/ritonavir) * Treatment with tipranivir/ritonavir, fosamprenavir, or fosamprenavir/ritonavir within 28 days prior to Screening * Exposure to an experimental drug or vaccine within either 28 days, 5 half-lives of the test agent, or twice the duration of the biological effect of the test agent, which ever is longer, prior to the first dose of IP. * Any acute or verified Grade 4 laboratory abnormality (with the exception of Grade 4 lipids) at Screening * ALT\> 5 times the upper limit of normal (ULN) at Screening * ALT ≥ 3X ULN and bilirubin \> 1.5 X ULN (with 35% direct bilirubin) at Screening

Locations (25)

GSK Investigational Site

Little Rock, Arkansas, United States

GSK Investigational Site

Bakersfield, California, United States

GSK Investigational Site

Beverly Hills, California, United States

GSK Investigational Site

Los Angeles, California, United States

GSK Investigational Site

San Diego, California, United States

GSK Investigational Site

Norwalk, Connecticut, United States

GSK Investigational Site

Washington D.C., District of Columbia, United States

GSK Investigational Site

Washington D.C., District of Columbia, United States

GSK Investigational Site

Fort Lauderdale, Florida, United States

GSK Investigational Site

Ft. Pierce, Florida, United States

...and 15 more locations

Outcomes

Primary Outcomes

Mean Change From Baseline in Plasma Human Immunodeficiency Virus Type 1 (HIV-1) Ribonucleic Acid (RNA) at Day 8

Plasma samples were collected for quantitative HIV-1 RNA analysis at Baseline (Day 1) and Day 8. Change from Baseline was calculated as the value at Day 8 minus the value at Baseline (Day 1). The analysis was performed using statistical modeling correcting for Baseline plasma HIV-1 RNA, Baseline Dolutegravir (DTG) fold change (FC), the overall susceptibility score (OSS) of the failing regimen, and the interaction between DTG FC and treatment. Means and differences were calculated using the average Baseline DTG FC of the entire Intent-to-Treat Exposed (ITT-E) Population. The last observation carried forward with discontinuation equals Baseline (LOCFDB) dataset was used for the analysis. For the LOCFDB dataset, missing values were carried forward from the previous, non-missing, available on-treatment assessment, except formissing values due to premature withdrawal or Day 8 missing values, which had the Baseline value imputed.

Time frame: Baseline and Day 8

Secondary Outcomes

Absolute Values in Plasma HIV-1 RNA Over Time

Plasma samples were collected for quantitative HIV-1 RNA analysis at Baseline (Day 1), Day 8, Day 28, Week 8, Week 12, Week 16, Week 24, Week 32, Week 40, Week 48, Week 60, Week 72, and Week 84. NA indicates data was not available.

Time frame: Baseline; Day 8; Day 28; Weeks 8, 12, 16, 24, 32, 40, 48, 60, 72, and 84

Mean Change From Baseline in Plasma HIV-1 RNA Over Time

Time frame: Baseline; Day 8; Day 28; Weeks 8, 12, 16, 24, 32, 40, 48, 60, 72, and 84

Number of Participants With Plasma HIV-1 RNA <50 c/mL Over Time

Plasma samples were collected for quantitative HIV-1 RNA analysis at Baseline (Day 1); Day 8; Day 28; Weeks 8, 12, 16, 24, 32, 40, and 48. Number of participants with plasma HIV-1 RNA level \<50 c/mL was obtained using Food and Drug Administration's (FDA's) snapshot algorithm, where all participants without HIV-1 RNA data at the visit of interest (due to missing data or discontinuation of investigational product prior to the visit window) were treated as non-responders. Also, participants who switched their concomitant antiretroviral therapy (ART) prior to the visit of interest as follows were also treated as non-responders: background ART substitutions not permitted per protocol; background ART substitutions permitted per protocol; however, the decision to switch is not documented as being before or at the first On-treatment visit after switching to optimized background regimen (OBR) (i.e. Day 28) where HIV-1 RNA is assessed.

Time frame: Baseline; Day 8; Day 28; Weeks 8, 12, 16, 24, 32, 40 and 48

Number of Participants With Plasma HIV-1 RNA <400 c/mL Over Time

Plasma samples were collected for quantitative HIV-1 RNA analysis at Baseline (Day 1); Day 8; Day 28; Weeks 8, 12, 16, 24, 32, 40 and 48. Number of participants with plasma HIV-1 RNA level \<400 c/mL was obtained using FDA's snapshot algorithm, where all participants without HIV-1 RNA data at the visit of interest (due to missing data or discontinuation of investigational product prior to the visit window) were treated as non-responders. Also, participants who switch their concomitant ART prior to the visit of interest as follows were also treated as non-responders: background ART substitutions not permitted per protocol; background ART substitutions permitted per protocol; however the decision to switch is not documented as being before or at the first On-treatment visit after switching to OBR (i.e. Day 28) where HIV-1 RNA is assessed.

Time frame: Baseline; Day 8; Day 28; Weeks 8, 12, 16, 24, 32, 40 and 48

Absolute Values in Cluster of Differentiation 4+ (CD4+) Cell Counts Over Time

Blood samples were collected for lymphocyte subset assessment by flow cytometry at Baseline; Day 8; Day 28; Weeks 8, 12, 16, 24, 32, 40, 48, 60, 72, and 84.

Time frame: Baseline; Day 8; Day 28; Weeks 8, 12, 16, 24, 32, 40, 48, 60, 72, and 84

Median Change From Baseline in CD4+ Cell Counts Over Time

Blood samples were collected for lymphocyte subset assessment by flow cytometry at Baseline; Day 8; Day 28; Weeks 8, 12, 16, 24, 32, 40, 48, 60, 72, and 84. Change from Baseline was calculated as the post-Baseline value minus the value at Baseline.

Time frame: Baseline; Day 8; Day 28; Weeks 8, 12, 16, 24, 32, 40, 48, 60, 72, and 84

Absolute Values in Cluster of Differentiation 8+ (CD8+) Cell Counts Over Time

Blood samples were collected for lymphocyte subset assessment by flow cytometry at Baseline; Day 28; and Weeks 12, 24, and 48.

Time frame: Baseline; Day 28; Weeks 12, 24, and 48

Median Change From Baseline in CD8+ Cell Counts Over Time

Blood samples were collected for lymphocyte subset assessment by flow cytometry at Baseline; Day 28; and Weeks 12, 24, and 48. Change from Baseline was calculated as the post-Baseline value minus the value at Baseline.

Time frame: Baseline; Day 28; Weeks 12, 24, and 48

Number of Participants With the Indicated Type of HIV-1 Disease Progression (Acquired Immunodeficiency Syndrome [AIDS] or Death [DT])

The number of participants with HIV-1 disease progression (AIDS or death) was assessed per the Centers for Disease Control and Prevention (CDC) 1993 revised classification system for HIV infection and expanded surveillance case definition for AIDS among adolescents and adults. The CDC classifies HIV infection as Category A (participants with asymptomatic HIV infection, acute HIV infection with accompanying illness, or persistent generalized lymphadenopathy), Category B (participants with symptomatic non-AIDS condition, i.e., conditions that are attributed to HIV infection or are indicative of a defect in cell-mediated immunity; or conditions are considered by physicians to have a clinical course or to require management that is complicated by HIV infection), and Category C (includes AIDS indicator conditions as defined by diagnostic or presumptive measures).

Time frame: From the day of the first dose of study drug until early withdrawal or the Week 48 analysis cut-off date (median of 55 study weeks)

Number of Participants With Any Adverse Event (Serious and Non-serious) of the Indicated Grade

An adverse event (AE) is defined as any untoward medical occurrence in a participant, temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product. A serious adverse event (SAE) is defined as any untoward medical occurrence that, at any dose: results in death; is life threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity; or is a congenital anomaly/birth defect. Medical or scientific judgment should be exercised in other situations. Adverse events were graded for severity according to the Division of AIDS (DAIDS) toxicity scales as: Grade 1 (mild), Grade 2 (moderate), Grade 3 (severe), or Grade 4 (potentially life threatening).

Time frame: From the first dose of study medication until early withdrawal or through the Week 48 analysis data cut-off date (median of 55 study weeks)

Number of Participants With the Maximum Post-Baseline-emergent Clinical Chemistry Toxicities of the Indicated Grade

Participants with post-Baseline-emergent clinical chemistry toxicities were analyzed. Clinical chemistry toxicities were graded for severity according to the DAIDS toxicity scales as: Grade 1 (mild), Grade 2 (moderate), Grade 3 (severe), or Grade 4 (potentially life threatening).

Time frame: From the first dose of study medication until early withdrawal or through the Week 48 analysis data cut-off date (median of 55 study weeks)

Number of Participants With the Maximum Post-Baseline-emergent Hematology Toxicities of the Indicated Grade

Participants with post-Baseline-emergent hematology toxicities were analyzed. Hematology toxicities were graded for severity according to the DAIDS toxicity scales as: Grade 1 (mild), Grade 2 (moderate), Grade 3 (severe), or Grade 4 (potentially life threatening).

Time frame: From the first dose of study medication until early withdrawal or through the Week 48 analysis data cut-off date (median of 55 study weeks)

AUC(0-tau) of DTG

The area under the time concentration curve over the dosing interval (AUC\[0-tau\]) of DTG was assessed by a population pharmacokinetic (PK) modeling approach using pooled DTG PK data from multiple studies. Blood samples for the determination of plasma DTG concentration were collected at the following time points: pre-dose and 1-3 hours post-dose on Day 8; pre-dose and within a post-dose window (1-3 hours or 4-12 hours) on Day 28 and Week 24. For Day 8 PK, only samples collected from participants randomized to the active DTG arm were analyzed.

Time frame: Day 8, Day 28, and Week 24

Cmax of DTG

The maximal concentration (Cmax) of DTG was assessed by a population PK modeling approach using pooled DTG PK data from multiple studies. Blood samples for the determination of plasma DTG concentration were collected at the following time points: pre-dose and 1-3 hours post-dose on Day 8; pre-dose and within a post-dose window (1-3 hours or 4-12 hours) on Day 28 and Week 24. For Day 8 PK, only samples collected from participants randomized to the active DTG arm were analyzed.

Time frame: Day 8, Day 28, and Week 24

Plasma DTG Pre-dose Concentration (C0) at Day 8, Day 28, and Week 24; and Average DTG C0 (C0 Avg) at Week 24

Blood samples for the determination of plasma DTG pre-dose concentration were collected pre-dose on Day 8, Day 28, and Week 24. For Day 8 PK, only samples collected from participants randomized to the active DTG arm were analyzed. C0 Avg was calculated at Week 24 as the mean of the concentration at Day 8, Day 28, and Week 24.

Time frame: Day 8, Day 28, and Week 24

Number of Participants With the Indicated Treatment-emergent Integrase (IN) Mutations Detected at the Time of Defined Virologic Failure (PDVF), as a Measure of Genotypic Resistance

For participants meeting one of the criteria for PDVF, plasma samples collected at the time point of virologic failure were tested to evaluate any potential genotypic and/or phenotypic evolution of resistance. PDVF was defined as (A) Virologic Non-response: a decrease in plasma HIV-1 RNA of \<1 log10 copies/mL by Day 28, with subsequent confirmation, unless plasma HIV-1 RNA is \<400 copies/mL; confirmed plasma HIV-1 RNA levels \>=400 copies/mL on or after Week 24 or (B) Virologic Rebound: confirmed rebound in plasma HIV-1 RNA levels to \>=400 copies/mL after prior confirmed suppression to \<400 copies/mL; confirmed plasma HIV-1 RNA levels \>1 log10 copies/mL above the nadir value, where nadir is \>=400 copies/mL.Treatment-emergent IN mutations are those detected at the time of PDVF but not at Baseline.

Time frame: From the first dose of study medication until early withdrawal or through the Week 48 analysis data cut-off date (median of 55 study weeks)

Number of Participants With the Indicated Fold Increase in Fold Change (FC) in the 50% Inhibitory Concentration Relative to Wild-type Virus for DTG (i.e. PDVF FC/Baseline FC Ratio) at the Time of PDVF, as a Measure of Phenotypic Resistance

For participants meeting one of the criteria for PDVF, plasma samples collected at the time point of virologic failure were tested to evaluate any potential genotypic and/or phenotypic evolution of resistance. The FC in IC50 (50% inhibitory concentration) for DTG relative to wild-type virus was determined for virus isolated at Baseline and at the time of PDVF. The number of participants with the indicated change (ratio) in the two values at the time of PDVF is presented. PDVF was defined as (A) Virologic Non-response: a decrease in plasma HIV-1 RNA of \<1 log10 copies/mL by Day 28, with subsequent confirmation, unless plasma HIV-1 RNA is \<400 copies/mL; confirmed plasma HIV-1 RNA levels \>=400 copies/mL on or after Week 24 or (B) Virologic Rebound: confirmed rebound in plasma HIV-1 RNA levels to \>=400 copies/mL after prior confirmed suppression to \<400 copies/mL; confirmed plasma HIV-1 RNA levels \>1 log10 copies/mL above the nadir value, where nadir is \>=400 copies/mL.

Time frame: From the first dose of study medication until early withdrawal or through the Week 48 analysis data cut-off date (median of 55 study weeks)

Number of Participants Who Discontinued Study Treatment Due to AEs

The number of participants who permanently discontinued study treatment due to AEs is presented.

Time frame: From the first dose of study medication until early withdrawal or through the Week 48 analysis data cut-off date (median of 55 study weeks)

Number of Participants With Clinically Significant Electrocardiogram (ECG) Findings

Twelve lead ECG was performed using an automated ECG machine. The number of participants with abnormal-clinically significant ECG findings at any time on-treatment is reported.

Time frame: Up to Week 24

Change From Baseline in Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP)

Vital signs including SBP and DBP were measured at Baseline, Week 24 and Week 48. Baseline was defined as the last pre-treatment value. Change from Baseline was calculated as the post-Baseline value minus the value at Baseline.

Time frame: Baseline and Weeks 24 and 48

Change From Baseline in Heart Rate

Vital signs including heart rate was measured at Baseline, Week 24 and Week 48. Baseline was defined as the last pre-treatment value. Change from Baseline was calculated as the post-Baseline value minus the value at Baseline.

Time frame: Baseline and Weeks 24 and 48

Change From Baseline in Albumin Level

Blood samples were collected for the analysis of clinical chemistry parameters such as albumin. Baseline was defined as the last pre-treatment value. Change from Baseline was calculated as the post-Baseline value minus the value at Baseline.

Time frame: Baseline, Week 24 and 48

Change From Baseline in Alkaline Phosphatase (ALP), Alanine Aminotransferase (ALT), Aspartate Aminotransferase (AST) and Creatine Kinase

Blood samples were collected for the analysis of clinical chemistry parameters such as ALP, ALT, AST and creatine kinase. Baseline was defined as the last pre-treatment value. Change from Baseline was calculated as the post-Baseline value minus the value at Baseline. NA indicates data was not available.