A Study of the Pharmacokinetics and Antiviral Activity of Dolutegravir in the Central Nervous System in HIV-1 Infected ART-naive Subjects

A Single-arm Study of the Safety, Efficacy and Central Nervous System and Plasma PK of GSK1349572 (Dolutegravir, DTG) 50 mg Once Daily in Combination With the Abacavir/Lamivudine Fixed Dose Combination Tablet Over 96 Weeks in HIV-1 Infected Antiretroviral Naive Adult Subjects

Status

Completed

Phases

Phase 3

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT01499199

Enrollment

Registered

2011-12-26

Start date

2012-01-31

Completion date

2014-05-31

Last updated

2015-02-25

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Infection, Human Immunodeficiency Virus

Keywords

cerebrospinal fluid (CSF), ART-naive, integrase inhibitor, dolutegravir, antiretroviral therapy naive

Brief summary

ING116070 is a Phase IIIb single-arm, open-label, multicenter study. The study will be conducted in approximately 14 HIV-1 infected antiretroviral therapy (ART)-naïve subjects. Subjects who fulfill eligibility requirements will receive dolutegravir (DTG) 50 mg once daily in combination with the fixed dose dual nucleoside reverse transcripatase inhibitor(NRTI) abacavir/lamivudine (ABC/3TC) for 96 weeks. One pair of pharmacokinetic (PK) samples in plasma and cerebral spinal fluid (CSF) (matching time) for determination of DTG concentration will be collected at Week 2 and Week 16. Samples for plasma HIV-1 RNA will be collected at Baseline and various time points throughout the study and samples for HIV-1 RNA levels in the CSF will be collected at Baseline, Week 2 and Week 16. Safety, additional measures of antiviral activity and development of viral resistance will also be evlauated. The primary analysis will take place after the last subject completes 16 weeks on therapy; additional analyses will be conducted after the last subject completes Weeks 2 and 96 (end of study).

Detailed description

ING116070 is a Phase IIIb single-arm, open-label, multicenter study. The study will be conducted in approximately 14 HIV-1 infected antiretroviral therapy (ART)-naïve subjects. Subjects who meet all screening requirements may enter the study and initiate treatment as soon as all screening procedures have been completed and results are available and on file. The 14-day screening period may be extended to 28 days to allow receipt of all Screening assessment results and to accommodate scheduling. Subjects who fulfill eligibility requirements will receive dolutegravir (DTG) 50 mg once daily in combination with the fixed dose dual nucleoside reverse transcripatase inhibitor(NRTI) abacavir/lamivudine ABC/3TC for 96 weeks. One pair of pharmacokinetic (PK) samples in plasma and CSF (matching time) for determination of DTG concentration will be collected at Week 2 and Week 16. Samples for plasma HIV-1 RNA will be collected at Baseline and various time points throughout the study and samples for HIV-1 RNA levels in the CSF will be collected at Baseline, Week 2 and Week 16. Safety, additional measures of antiviral activity and development of viral resistance will also be evlauated. The primary analysis will take place after the last subject completes 16 weeks on therapy; additional analyses will be conducted after the last subject completes Weeks 2 and 96 (end of study). Subjects are considered to have completed the study if they remain on therapy (i.e., have not permanently discontinued investigational product \[IP\]) and complete the Treatment Phase, including the Week 96 visit.

Interventions

DRUGDolutegravir

50mg Once Daily

Study design

Allocation

Intervention model

SINGLE_GROUP

Primary purpose

TREATMENT

Masking

NONE

Eligibility

Sex/Gender

ALL

Age

18 Years to No maximum

Healthy volunteers

Inclusion criteria

* HIV-1 infected adults at least 18 years of age. Females are eligible to enter and participate in the study if she is (1) of non-childbearing potential or (2) of childbearing potential with a negative pregnancy test at Screening and Day 1 and agrees to use protocol-defined methods of birthcontrol while on the study. * HIV-1 infection as documented by Screening plasma HIV-1 RNA greater than or equal to 5000 copies/mL * CD4+ cell count greater than or equal to 200 cells/mm3 * Antiretroviral-naive (less than or equal to 10 days of prior therapy with any antiretroviral agent following diagnosis of HIV-1 infection) * Signed and dated written informed consent is obtained from the subject or the subject's legal representative prior to screening * Documentation that the subject has been screened for, and is negative for the HLA-B\*5701 allele * Is willing to undergo serial lumbar punctures

Exclusion criteria

* Relative or absolute contraindication to lumbar puncture, such as current coagulopathy, thrombocytopenia (platelets less than 50,000/microliter), hemophilia, or use of anticoagulant medication * Moderate or severe cognitive impairment * Women who are pregnant or breastfeeding * Any evidence of an active Center for Disease Control and Prevention (CDC) Category C disease, except cutaneous Kaposi's sarcoma not requiring systemic therapy or historic CD4+ cell levels less than 200cells/mm3 * Subjects with any degree of hepatic impairment * Positive for Hepatitis B at screening (+HbsAg), or an anticipated need for Hepatitis C virus (HCV) therapy during the study * History or presence of allergy or intolerance to the study drugs or their components or drugs of their class * History of malignancy within the past 5 years or ongoing malignancy other than cutaneous Kaposi's sarcoma, basal cell carcinoma, or resected, non-invasive cutaneous squamous cell carcinoma; other localized malignancies require agreement between the investigator and the Study medical monitor for inclusion of the subject * Recent history (less than or equal to 3 months) of any upper or lower gastrointestinal bleed, with the exception of anal or rectal bleeding * Treatment with an HIV-1 immunotherapeutic vaccine within 90 days of Screening * Treatment with any of the following agents within 28 days of Screening: radiation therapy, cytotoxic chemotherapeutic agents, any immunomodulators that alter immune responses * Treatment with any agent, except recognized ART as allowed above, with documented activity against HIV-1 in vitro within 28 days of first dose of IP * Exposure to an experimental drug or experimental vaccine within either 28 days, 5 half-lives of the test agent, or twice the duration of the biological effect of the test agent, whichever is longer, prior to the first dose of IP * Any evidence of primary viral resistance based on the presence of any major resistance-associated mutation in the Screening result or, if known, any historical resistance test result. Note: retests of Screening genotypes are not allowed * Any verified Grade 4 laboratory abnormality (a single repeat test is allowed during the Screening period to verify a result). Any acute laboratory abnormality at Screening, which, in the opinion of the Investigator, would preclude the subject's participation in the study of an investigational compound is exclusionary * Alanine aminotransferase (ALT) greater than 5 times the upper limit of normal (ULN) * ALT greater than or equal to 3xULN and bilirubin greater than or equal to 1.5xULN (with greater than 35% direct bilirubin) * Subject has creatinine clearance of less than 50 mL/min via Cockroft-Gault method

Design outcomes

Primary

Measure	Time frame	Description
The Ratio of Total and Unbound DTG Concentrations Between Cerebrospinal Fluid (CSF) and Plasma at Week 2 and Week 16	Week 2 and Week 16	Cerebrospinal fluid (CSF) is a clear, colorless bodily fluid produced in the choroid plexus of the brain. The CFS samples were collected at the Week 2 and Week 16 visits, within 1 hour of plasma pharmacokinetic (PK) sampling. The ratio (presented as a percentage) of CSF DTG concentration over paired plasma total DTG concentration (RCSF\_plasma) was calculated at the Week 2 and Week 16 visits.
Total DTG Plasma Concentrations at Week 2 and Week 16	Week 2 and Week 16	Total plasma DTG concentrations were calculated at the Week 2 and Week 16 visits.
Unbound DTG Plasma Concentrations at Week 2 and Week 16	Week 2 and Week 16	Unbound (free, not bound to cellular proteins) plasma DTG concentrations were calculated at the Week 2 and Week 16 visits.
Plasma DTG Unbound Fraction at Week 2 and Week 16	Week 2 and Week 16	The unbound fraction of DTG in plasma (presented as a percentage of unbound \[i.e., free DTG not bound to cellular proteins\] DTG plasma concentration over paired plasma total DTG concentration) was calculated at the Week 2 and Week 16 visits.
DTG Concentrations in CSF at Weeks 2 and Week 16	Week 2 and Week 16	CSF is a clear, colorless bodily fluid produced in the choroid plexus of the brain. The CFS samples were collected at the Week 2 and Week 16 visits, within 1 hour of plasma PK sampling. DTG concentration in CSF were calculated at the Week 2 and Week 16 visits.

Secondary

Measure	Time frame	Description
Number of Participants With CSF HIV-1 RNA <50 Copies/Milliliter (c/mL) at Baseline, Week 2, and Week 16	Baseline, Week 2, and Week 16	The antiviral activity of dolutegravir in CSF over time was measured as the number of participants with HIV-1 RNA \<50 copies/milliliter (c/mL).
Absolute Values and Change From Baseline in CSF HIV-1 RNA Levels at Week 2 and Week 16	Baseline, Week 2, and Week 16	The antiviral activity of dolutegravir in CSF over time was measured as absolute values and change from Baseline in HIV-1 RNA levels in CSF at Week 2 and Week 16. Change from Baseline was calculated as the post-Baseline value minus the Baseline value.
Absolute Values and Change From Baseline in Cluster of Differentiation 8+ (CD8+) Cell Counts at Weeks 4, 12, 16, 24, 48, and 96	Baseline; Weeks 4, 12, 16, 24, 48, and 96	The absolute value for CD48+ cell count (cells per millimeters cubed \[mm\^3\]) was assessed at Baseline, Week 4, Week 12, Week 16, Week 24, Week 48, and Week 96. Change from Baseline was calculated as the post-Baseline value minus the Baseline value.
Number of Participants With the Indicated Number of Copies of HIV-1 RNA in Both the CSF and Plasma at Baseline, Week 2, and Week 16	Baseline, Week 2, and Week 16	The relationship between HIV-1 RNA suppression in plasma and the CSF was measured as a comparison and as a change in the number of participants in the cross tabulation of \<50 copies/mL in plasma, \<50 copies/mL in CSF, \>=50 copies/mL in plasma, and \>=50 copies/mL in CSF at Baseline, Week 2, and Week 16.
The Numbers of Participants (Par.) With Clinical Adverse Events or Laboratory Abnormalities	Baseline (BL) through the date the last participant completed Week (W) 96 + the follow-up visit (if applicable)	An AE is any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of a medicinal product. An SAE is 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, is a congenital anomaly/birth defect, or is an event of possible drug-induced liver injury. Refer to the general Adverse AE/SAE module for a complete list of AEs/SAEs. Any abnormal laboratory test result (hematology, clinical chemistry, or urinalysis) or other safety assessments (e.g., electrocardiograms \[ECGs\], radiological scans, vital sign measurements), including those that worsen from Baseline, and were felt to be clinically significant in the medical and scientific judgment of the investigator, were recorded as AEs or SAEs. Clinically suspected cases of hypersensitivity to ABC were also SAEs.
Number of Participants With Treatment-emergent Genotypic and Phenotypic Resistance to DTG and Other Antiretroviral Therapy (ART)	Baseline through the date the last participant completed Week 96	The number of participants with treatment-emergent genotypic and phenotypic resistance to integrase inhibitors (INIs), nucleoside reverse transcriptase inhibitors (NRTIs), non-nucleoside reverse transctiptase inhibitors (NNRTIs), and protease inhibitors (PIs) was assessed.
Number of Participants With Post-Baseline HIV-1-associated Conditions, Including Recurrences	Baseline through the date the last participant completed Week 96 + follow-up visit (if applicable)	The number of participants who reported a new or recurrent Centers for Disease Control and Prevention (CDC) Class B or Class C condition was assessed from Baseline though the date the last participant completed Week 96 + the follow-up visit (if applicable). Category (CAT) A: one or more of the following conditions (CON), without any CON listed in Categories B and C: asymptomatic HIV infection, persistent generalized lymphadenopathy, acute (primary) HIV infection with accompanying illness or history of acute HIV infection. CAT B: symptomatic CON that are attributed to HIV infection or are indicative of a defect in cell-mediated immunity; or that are considered by physicians to have a clinical course or to require management that is complicated by HIV infection; and not included among CON listed in clinical CAT C. CAT C: the clinical CON listed in the AIDS surveillance case definition.
Pearson Correlation Between CSF DTG Concentration and Absolute Values and Change From Baseline (CFB) in CSF HIV-1 RNA at Week 2, Week 16, and Overall	From Baseline to Week 16	The Pearson Correlation Coefficient is a measure of the correlation between CSF DTG concentrations and absolute values/changes from Baseline in CSF HIV-1 RNA at Week 2 and Week 16. CSF HIV-1 RNA is measured as log10 copies per milliliter (copies/mL).
Number of Participants With Plasma HIV-1 RNA <50 Copies Per Milliliter (c/mL) at Baseline and Weeks 2, 4, 8, 12, and 16	Baseline; Weeks 2, 4, 8, 12, and 16	HIV-1 RNA response in plasma was measured as the number of participants with HIV-1 RNA less than 50 c/mL at Baseline, Week 2, Week 4, Week 8, Week 12, and Week 16.
Absolute Values and Change From Baseline in Cluster of Differentiation 4+ (CD4+) Cell Counts at Weeks 4, 8, 12, 16, 24, 36, 48, 60, 72, 84, and 96	Baseline; Weeks 4, 8, 12, 16, 24, 36, 48, 60, 72, 84, and 96	The absolute value for CD4+ cell count (cells per millimeters cubed \[mm\^3\]) was assessed at Baseline, Week 4, Week 8, Week 12, Week 16, Week 24, Week 36, Week 48, Week 60, Week 72, Week 84, and Week 96. Change from Baseline was calculated as the post-Baseline value minus the Baseline value.
Absolute Values and Change From Baseline in Plasma Human Immunodeficiency Virus (HIV-1) Ribonucleic Acid (RNA) Levels at Weeks 2, 4, 8, 12, 16, 24, 36, 48, 60, 72, 84, and 96	Baseline; Weeks 2, 4, 8, 12, 16, 24, 36, 48, 60, 72, 84, and 96	The plasma samples were collected at the Week 2, Week 4, Week 8, Week 12, Week 16, Week 24, Week 36, Week 48, Week 60, Week 72, Week 84, and Week 96 visits. Change from Baseline was calculated as the post-Baseline value minus the Baseline value.

Countries

United States

Participant flow

Pre-assignment details

Eligible participants received dolutegravir (DTG ) 50 milligrams (mg) once daily (OD) in combination with abacavir/lamivudine (ABC/3TC) for 96 weeks.

Participants by arm

Arm	Count
Dolutegravir 50 mg OD Participants received dolutegravir (DTG) 50 milligrams (mg) once daily (OD) in combination with abacavir/lamivudine (ABC/3TC) OD.	13
Total	13

Withdrawals & dropouts

Period	Reason	FG000
Overall Study	Adverse Event	1
Overall Study	Lack of Efficacy	1

Baseline characteristics

Characteristic	Dolutegravir 50 mg OD
Age, Continuous	40.2 Years STANDARD_DEVIATION 6.9
Baseline plasma human immunodeficiency virus-1 (HIV-1) ribonucleic acid (RNA)	4.73 log10 copies/mL
Number of participants with Baseline plasma HIV-1 RNA <=100000 copies/mL and >100000 copies/mL <=100000 copies/mL	8 Participants
Number of participants with Baseline plasma HIV-1 RNA <=100000 copies/mL and >100000 copies/mL >100000 copies/mL	5 Participants
Race/Ethnicity, Customized White	13 participants
Sex: Female, Male Female	0 Participants
Sex: Female, Male Male	13 Participants

Adverse events

Event type	EG000 affected / at risk
deaths Total, all-cause mortality	— / —
other Total, other adverse events	13 / 13
serious Total, serious adverse events	2 / 13

Outcome results

Primary

DTG Concentrations in CSF at Weeks 2 and Week 16

CSF is a clear, colorless bodily fluid produced in the choroid plexus of the brain. The CFS samples were collected at the Week 2 and Week 16 visits, within 1 hour of plasma PK sampling. DTG concentration in CSF were calculated at the Week 2 and Week 16 visits.