CClinicalTrials.gg
TerminatedNCT05838755NEPTUNE-17Updated Nov 21, 2025Results posted

A Study to Evaluate Efficacy and Safety of GSK3858279 in Diabetic Peripheral Neuropathic Pain

A Phase 2 interventional study of GSK3858279 and Placebo in Pain, sponsored by GlaxoSmithKline. Terminated at 81 sites in 11 countries. Open to participants aged 18 Years to 75 Years. Per ClinicalTrials.gov, last updated 2025-11-21.

Sponsored by GlaxoSmithKline · Phase 2, Interventional, and Treatment

Why this study was terminated
The study met futility criteria at pre-planned interim analysis, showing no clinical efficacy of the investigational drug. Based on the lack of efficacy at the interim data review, the sponsor decided to terminate the study.
Phase
Phase 2
Study type
Interventional
Enrollment
147
Allocation
Randomized
Ages
18 Years to 75 Years
Sex
All
01

Study summary

This is a multicenter randomized, double-blind, placebo-controlled phase 2 study to evaluate efficacy, safety, tolerability, pharmacokinetics, and target engagement of GSK3858279 in adult participants with chronic Diabetic Peripheral Neuropathic Pain (DPNP). The primary objective of the study is to assess the efficacy of GSK3858279 in participants with DPNP who have been unable to sufficiently manage their pain.

02

Conditions studied

  • Pain

Keywords

  • Diabetes
  • Neuropathic pain
  • Diabetic Peripheral Neuropathic Pain (DPNP)
  • 214221
  • GSK3858279
  • Efficacy
  • Safety
  • Pharmacokinetics
  • Tolerability
03

In context

Pain

2,219 studies on the registry are indexed under Pain; 917 are open to participants now.

This study's enrollment of 147 is above the median of 70 across 1,904 interventional studies indexed under Pain.

Browse Pain studies →

Lead sponsor

GlaxoSmithKline is the lead sponsor of 3,562 studies on the registry; 117 are open to participants now.

Of its 258 completed or terminated interventional studies of FDA-regulated products, 232 (90%) have results posted.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 75 Years
Sexes eligible
All
Accepts healthy volunteers
No

Inclusion criteria

  • Participant must be 18-75 years of age inclusive, at the time of signing the informed consent.
  • Type I or Type II diabetes with painful, distal, symmetrical, sensory motor neuropathy attributed to diabetes, of at least 6 months duration.
  • A pain score ≥4 and less than or equal to (≤) 9 by the 11-point NRS (0-10) for average daily pain intensity over the past 24 hours at the screening visit.
  • Body mass index (BMI) within the range 18-40 kilogram per meter square (kg/m\^2) (inclusive)
  • Capable of giving signed informed consent.

Exclusion criteria

Exclusion Criteria:

  • History or presence of cardiovascular, renal, gastrointestinal, lymphatic disorders which in the opinion of the investigator would interfere with the study procedures and/or assessments.
  • Participant has current painful peripheral neuropathy due to a cause other than diabetes (e.g. pernicious anemia, hypothyroidism, post-herpetic neuralgia).
  • History of significant allergies to monoclonal antibodies.
  • Current enrolment or past participation in a clinical study of an investigational medicinal product intervention within the last 30 days or 5 half-lives (whichever is longer) of signing consent.
  • Participants who are unlikely to comply with the protocol (e.g. uncooperative attitude, inability to return for subsequent visits, inability to complete the eDiary daily etc.) and/or otherwise considered by the Investigator to be unlikely to complete the study.
05

Study design

Phase
Phase 2
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Double (Participant, Investigator)
Enrollment
147 participants (actual)

Study arms

  • Experimental
    GSK3858279 60 mg

    Participants received GSK3858279 SC injection 60 milligram (mg) once per week for 12 weeks.

    Drug: GSK3858279

  • Experimental
    GSK3858279 360 mg

    Participants received GSK3858279 SC injection 360 mg once per week for 12 weeks.

    Drug: GSK3858279

  • Placebo comparator
    Placebo

    Participants received matching placebo subcutaneous (SC) injection once per week for 12 weeks.

    Drug: Placebo

Interventions

  • DrugGSK3858279

    GSK3858279 was administered

  • DrugPlacebo

    Placebo was administered

06

What researchers measure

Primary outcomes

  1. Change From Baseline in the Weekly Average of Average Daily Pain Score at Week 12, Assessed on the Numeric Rating Scale (NRS)

    The change from baseline (CFB) in the weekly average of the average daily pain score at Week 12 was assessed using Numeric Rating Scale (NRS). Participants recorded their average daily pain response daily using a Brief Pain Inventory Item 5. It is a single item designed for self-reporting average pain score for past 24 hours. Participants were asked to mark their average pain intensity daily, using the NRS, on an 11-point scale (0 = no pain, 10 = worst pain imaginable). The weekly average was computed as weekly average of the average daily scores (range: 0-10), where higher scores indicate more severe pain. A negative CFB indicates pain improvement. Baseline was defined as the average score over the 7 days before dosing (Day -7 to -1). Posterior mean CFB and the 95% credible interval were derived using a Bayesian mixed model repeated measures analysis. The data presented as "Mean" refers to the 'posterior mean' and "95% confidence interval" to '95% credible interval'.

    Time frame: Baseline (Day -7 to Day -1) and Week 12

Secondary outcomes

  1. Number of Participants With Adverse Events (AEs), Serious AE (SAEs) and AEs of Special Interest (AESI)

    Adverse events, SAEs, and AESIs were collected. An AE is any untoward medical occurrence in participant, temporally associated with use of study intervention, whether or not considered related to medicinal product. Any untoward event resulting in death, life-threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity, congenital anomaly/birth defect, medically important were categorized as SAE. AESIs of the study drug includes serious and opportunistic infections, tuberculosis (TB), serious hypersensitivity reactions and Injection site reactions.

    Time frame: Up to 27 weeks

  2. Number of Participants With Greater Than Or Equal To (>=) Grade 3 Hematological/Clinical Chemistry Abnormalities According to the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI-CTCAE)

    The laboratory measurements included hematology and clinical chemistry. The parameters evaluated were Eosinophils, Hemoglobin, White blood cell, Lymphocyte count, Neutrophil count and Platelet count, Alanine aminotransferase, Alkaline phosphatase, Aspartate aminotransferase, Blood bilirubin, Hypercalcemia, Hypocalcemia, Cholesterol, Creatine Phosphokinase, Creatinine, Gamma Glutamyl Transferase (GGT), Hypoglycemia, Hyperkalemia, Hypernatremia and Hypertriglyceridemia. Worst case grade (G) increase from baseline grade was evaluated for all the laboratory tests that were gradable by National Cancer Institute Common Terminology Criteria (NCI CTCAE). Data is presented for only those parameters for which participants had worst case \>= Grade 3 increase from Baseline.

    Time frame: Up to 27 weeks

  3. Maximum Concentration (Cmax) of GSK3858279

    Blood samples were collected for the determination of serum concentrations of GSK3858279 from which pharmacokinetic (PK) parameters were determined. Cmax was predicted from the population PK model fitted to GSK3859279 serum concentration time data collected at the indicated time points for PK analysis.

    Time frame: Pre-dose, Week 1, Week 4, Week 7, Week 8, Week 11, Week 12, Week 16, Week 20 and Week 27 post dose

  4. Time to Maximum Concentration (Tmax) of GSK3858279

    Blood samples were collected for the determination of serum concentrations of GSK3858279 from which PK parameters were determined. Tmax was predicted from the population PK model fitted to GSK3859279 serum concentration time data collected at the indicated time points for PK analysis.

    Time frame: Pre-dose, Week 1, Week 4, Week 7, Week 8, Week 11, Week 12, Week 16, Week 20 and Week 27 post dose

  5. Trough Concentration at the End of the Dosing Interval (Ctau) of GSK3858279

    Blood samples were collected for the determination of serum concentrations of GSK3858279 from which PK parameters were determined. Ctau is defined as the lowest concentration reached by a drug before the next dose is administered. Ctau was predicted from the population PK model fitted to GSK3859279 serum concentration time data collected at the indicated time points for PK analysis.

    Time frame: Pre-dose, Week 1, Week 4, Week 7, Week 8, Week 11, Week 12, Week 16, Week 20 and Week 27 post dose

  6. Average Concentration Over a Dosing Interval (Cavg) of GSK3858279

    Blood samples were collected for the determination of serum concentrations of GSK3858279 from which PK parameters were determined. Cavg is the average concentration over the dosing interval (weekly). Cavg was predicted from the population PK model fitted to GSK3859279 serum concentration time data collected at the indicated time points for PK analysis.

    Time frame: Pre-dose, Week 1, Week 4, Week 7, Week 8, Week 11, Week 12, Week 16, Week 20 and Week 27 post dose

  7. Area Under the Time-Concentration Curve (AUC) Over the Dosing Interval (AUC[0-Tau]) of GSK3858279

    Blood samples were collected for the determination of serum concentrations of GSK3858279 from which PK parameters were determined. AUC(0-tau) was predicted from the population model fitted to GSK3859279 serum concentration time data collected at the indicated time points for PK analysis.

    Time frame: Pre-dose, Week 1, Week 4, Week 7, Week 8, Week 11, Week 12, Week 16, Week 20 and Week 27 post dose

  8. Change From Baseline in the Short-Form Mcgill Pain Questionnaire Total Score Over Time

    The McGill pain questionnaire Short Form 2 is a 22-item questionnaire total score, which evaluated multi-dimensional pain over time. The questionnaire consists of 22 different descriptors of pain, and each item is rated based on a 0-10 pain intensity scale with 0 indicating no pain and 10 as worst possible pain. The total score was calculated as the mean of all item ratings. Higher scores indicate more severe pain. Baseline is defined as the last assessment prior to the first dose with a non-missing value, including those from unscheduled visits. Posterior mean change from baseline, 95 percent (%) credible interval (CI) was derived using Bayesian mixed model repeated measures. The data presented as 'Mean' refers to 'posterior mean' and '95% confidence interval' refers to '95% credible intervals'.

    Time frame: Baseline (Day1), Week 2, Week 4, Week 8 and Week 12

  9. Change From Baseline in the Weekly Average of Average Daily Pain Score Over Time, Assessed on the NRS

    The change from baseline (CFB) in the weekly average of the average daily pain score at indicated time points was assessed using NRS. Participants recorded their average daily pain response daily using a Brief Pain Inventory Item 5. It is a single item designed for self-reporting average pain score for past 24 hours. Participants were asked to mark their average pain intensity daily, using the NRS, on an 11-point scale (0 = no pain, 10 = worst pain imaginable). The weekly average was computed as weekly average of the average daily scores (range: 0-10), where higher scores indicate more severe pain. A negative CFB indicates pain improvement. Baseline was defined as the average score over the 7 days before dosing (Day - 7 to -1). Posterior mean CFB and the 95% credible interval were derived using a Bayesian mixed model repeated measures analysis. The data presented as 'Mean' refers to the 'posterior mean' and '95% confidence interval' to the '95% credible interval'.

    Time frame: Baseline (Day -7 to Day -1), Week 1, Week 2, Week 3, Week 4, Week 5, Week 6, Week 7, Week 8, Week 9, Week 10, Week 11 and Week 12

  10. Proportion of Participants With Greater Than or Equal To (>=) 30 Percentage (%) Reduction From Baseline in the Weekly Average of Average Daily Pain Intensity at Week 12, Assessed on the NRS

    The proportion of participants who achieved \>=30 percentage reduction from Baseline (responders) in the weekly average of the average daily pain score at Week 12 as measured by NRS is reported. Participants were instructed to assess their average daily pain daily, and to record the response in a Brief Pain Inventory item 5. It is a single item designed to capture information on the self- reported average pain score over the past 24 hours. Participants were asked to mark their pain- intensity daily, using the NRS, on an 11- point scale (0-10), with 0 = no pain, and 10 = worst pain imaginable. The weekly average was computed as weekly average of the average daily scores (range: 0-10), where higher scores indicate more severe pain. The data is presented for proportion of responders where 'Mean' refers to 'posterior mean proportion' and '95% confidence interval' refers to '95% credible interval'.

    Time frame: At Week 12

  11. Proportion of Participants With Greater Than or Equal To >= 50 % Reduction From Baseline in the Weekly Average of Average Daily Pain Score at Week 12, Assessed on the NRS

    The proportion of participants who achieved \>=50 percentage reduction from Baseline (responders) in the weekly average of the average daily pain score at Week 12 as measured by NRS is reported. Participants were instructed to assess their average daily pain daily, and to record the response in a Brief Pain Inventory item 5. It is a single item designed to capture information on the self- reported average pain score over the past 24 hours. Participants were asked to mark their pain- intensity daily, using the NRS, on an 11- point scale (0-10), with 0 = no pain, and 10 = worst pain imaginable. The weekly average was computed as weekly average of the average daily scores (range: 0-10), where higher scores indicate more severe pain. The data is presented for proportion of responders where 'Mean' refers to 'posterior mean proportion' and '95% confidence interval' refers to '95% credible interval'.

    Time frame: At Week 12

07

Results

Posted Nov 21, 2025

Participant flow

A total of 147 participants were enrolled in the study, Out of which 144 participants were included in the full analysis set (FAS) population.

Participant flow — Overall Study
MilestonePlaceboGSK3858279 60 mgGSK3858279 360 mg
Started504849
Full analysis set484848
Completed201717
Not completed303132
Withdrew: Adverse event100
Withdrew: Lack of efficacy101
Withdrew: Lost to follow-up014
Withdrew: Withdrawal by subject020
Withdrew: Study terminated by sponsor262726
Withdrew: Randomized, not treated201
Withdrew: Pregnancy010

Outcome measures

PrimaryChange From Baseline in the Weekly Average of Average Daily Pain Score at Week 12, Assessed on the Numeric Rating Scale (NRS)

The change from baseline (CFB) in the weekly average of the average daily pain score at Week 12 was assessed using Numeric Rating Scale (NRS). Participants recorded their average daily pain response daily using a Brief Pain Inventory Item 5. It is a single item designed for self-reporting average pain score for past 24 hours. Participants were asked to mark their average pain intensity daily, using the NRS, on an 11-point scale (0 = no pain, 10 = worst pain imaginable). The weekly average was computed as weekly average of the average daily scores (range: 0-10), where higher scores indicate more severe pain. A negative CFB indicates pain improvement. Baseline was defined as the average score over the 7 days before dosing (Day -7 to -1). Posterior mean CFB and the 95% credible interval were derived using a Bayesian mixed model repeated measures analysis. The data presented as "Mean" refers to the 'posterior mean' and "95% confidence interval" to '95% credible interval'.

Time frame:
Baseline (Day -7 to Day -1) and Week 12
Reported as:
Mean · Scores on a Scale
Change From Baseline in the Weekly Average of Average Daily Pain Score at Week 12, Assessed on the Numeric Rating Scale (NRS)
Scores on a ScalePlaceboGSK3858279 60 mgGSK3858279 360 mg
Change From Baseline in the Weekly Average of Average Daily Pain Score at Week 12, Assessed on the Numeric Rating Scale (NRS)-1.85 ± -2.44-2.50 ± -3.09-2.07 ± -2.67
Statistical analysis
  • Placebo vs GSK3858279 60 mg · Posterior mean difference: -0.65 · 95% CI -1.47 to 0.18Posterior mean difference with 95% credible interval is reported using Bayesian mixed model repeated measures analysis.
  • Placebo vs GSK3858279 360 mg · Posterior mean difference: -0.22 · 95% CI -1.04 to 0.61Posterior mean difference with 95% credible interval is reported using Bayesian mixed model repeated measures analysis.
SecondaryNumber of Participants With Adverse Events (AEs), Serious AE (SAEs) and AEs of Special Interest (AESI)

Adverse events, SAEs, and AESIs were collected. An AE is any untoward medical occurrence in participant, temporally associated with use of study intervention, whether or not considered related to medicinal product. Any untoward event resulting in death, life-threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity, congenital anomaly/birth defect, medically important were categorized as SAE. AESIs of the study drug includes serious and opportunistic infections, tuberculosis (TB), serious hypersensitivity reactions and Injection site reactions.

Time frame:
Up to 27 weeks
Reported as:
Count of participants · Participants
Number of Participants With Adverse Events (AEs), Serious AE (SAEs) and AEs of Special Interest (AESI)
ParticipantsPlaceboGSK3858279 60 mgGSK3858279 360 mg
Any AE272324
Any SAE420
Any AESI645
SecondaryNumber of Participants With Greater Than Or Equal To (>=) Grade 3 Hematological/Clinical Chemistry Abnormalities According to the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI-CTCAE)

The laboratory measurements included hematology and clinical chemistry. The parameters evaluated were Eosinophils, Hemoglobin, White blood cell, Lymphocyte count, Neutrophil count and Platelet count, Alanine aminotransferase, Alkaline phosphatase, Aspartate aminotransferase, Blood bilirubin, Hypercalcemia, Hypocalcemia, Cholesterol, Creatine Phosphokinase, Creatinine, Gamma Glutamyl Transferase (GGT), Hypoglycemia, Hyperkalemia, Hypernatremia and Hypertriglyceridemia. Worst case grade (G) increase from baseline grade was evaluated for all the laboratory tests that were gradable by National Cancer Institute Common Terminology Criteria (NCI CTCAE). Data is presented for only those parameters for which participants had worst case \>= Grade 3 increase from Baseline.

Time frame:
Up to 27 weeks
Reported as:
Count of participants · Participants
Number of Participants With Greater Than Or Equal To (>=) Grade 3 Hematological/Clinical Chemistry Abnormalities According to the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI-CTCAE)
ParticipantsPlaceboGSK3858279 60 mgGSK3858279 360 mg
>= Grade 3 increase in Hematological Abnormalities000
Grade3 increase-Clinical Chemistry Abnormality,GGT010
SecondaryMaximum Concentration (Cmax) of GSK3858279

Blood samples were collected for the determination of serum concentrations of GSK3858279 from which pharmacokinetic (PK) parameters were determined. Cmax was predicted from the population PK model fitted to GSK3859279 serum concentration time data collected at the indicated time points for PK analysis.

Time frame:
Pre-dose, Week 1, Week 4, Week 7, Week 8, Week 11, Week 12, Week 16, Week 20 and Week 27 post dose
Reported as:
Geometric mean · Nanogram per milliliter (ng/mL)
Maximum Concentration (Cmax) of GSK3858279
Nanogram per milliliter (ng/mL)GSK3858279 60 mgGSK3858279 360 mg
Maximum Concentration (Cmax) of GSK38582792943.3 ± 5817125.9 ± 34
SecondaryTime to Maximum Concentration (Tmax) of GSK3858279

Blood samples were collected for the determination of serum concentrations of GSK3858279 from which PK parameters were determined. Tmax was predicted from the population PK model fitted to GSK3859279 serum concentration time data collected at the indicated time points for PK analysis.

Time frame:
Pre-dose, Week 1, Week 4, Week 7, Week 8, Week 11, Week 12, Week 16, Week 20 and Week 27 post dose
Reported as:
Median · Day
Time to Maximum Concentration (Tmax) of GSK3858279
DayGSK3858279 60 mgGSK3858279 360 mg
Time to Maximum Concentration (Tmax) of GSK38582791.518 ± 0.641.360 ± 0.47
SecondaryTrough Concentration at the End of the Dosing Interval (Ctau) of GSK3858279

Blood samples were collected for the determination of serum concentrations of GSK3858279 from which PK parameters were determined. Ctau is defined as the lowest concentration reached by a drug before the next dose is administered. Ctau was predicted from the population PK model fitted to GSK3859279 serum concentration time data collected at the indicated time points for PK analysis.

Time frame:
Pre-dose, Week 1, Week 4, Week 7, Week 8, Week 11, Week 12, Week 16, Week 20 and Week 27 post dose
Reported as:
Geometric mean · Nanogram per milliliter (ng/mL)
Trough Concentration at the End of the Dosing Interval (Ctau) of GSK3858279
Nanogram per milliliter (ng/mL)GSK3858279 60 mgGSK3858279 360 mg
Trough Concentration at the End of the Dosing Interval (Ctau) of GSK38582791910.4 ± 529543.2 ± 43
SecondaryAverage Concentration Over a Dosing Interval (Cavg) of GSK3858279

Blood samples were collected for the determination of serum concentrations of GSK3858279 from which PK parameters were determined. Cavg is the average concentration over the dosing interval (weekly). Cavg was predicted from the population PK model fitted to GSK3859279 serum concentration time data collected at the indicated time points for PK analysis.

Time frame:
Pre-dose, Week 1, Week 4, Week 7, Week 8, Week 11, Week 12, Week 16, Week 20 and Week 27 post dose
Reported as:
Geometric mean · Nanogram per milliliter (ng/mL)
Average Concentration Over a Dosing Interval (Cavg) of GSK3858279
Nanogram per milliliter (ng/mL)GSK3858279 60 mgGSK3858279 360 mg
Average Concentration Over a Dosing Interval (Cavg) of GSK38582792461.8 ± 5413550.4 ± 35
SecondaryArea Under the Time-Concentration Curve (AUC) Over the Dosing Interval (AUC[0-Tau]) of GSK3858279

Blood samples were collected for the determination of serum concentrations of GSK3858279 from which PK parameters were determined. AUC(0-tau) was predicted from the population model fitted to GSK3859279 serum concentration time data collected at the indicated time points for PK analysis.

Time frame:
Pre-dose, Week 1, Week 4, Week 7, Week 8, Week 11, Week 12, Week 16, Week 20 and Week 27 post dose
Reported as:
Geometric mean · Day*Nanogram per milliliter (Day*ng/mL)
Area Under the Time-Concentration Curve (AUC) Over the Dosing Interval (AUC[0-Tau]) of GSK3858279
Day*Nanogram per milliliter (Day*ng/mL)GSK3858279 60 mgGSK3858279 360 mg
Area Under the Time-Concentration Curve (AUC) Over the Dosing Interval (AUC[0-Tau]) of GSK385827917232.4 ± 5494852.5 ± 35
SecondaryChange From Baseline in the Short-Form Mcgill Pain Questionnaire Total Score Over Time

The McGill pain questionnaire Short Form 2 is a 22-item questionnaire total score, which evaluated multi-dimensional pain over time. The questionnaire consists of 22 different descriptors of pain, and each item is rated based on a 0-10 pain intensity scale with 0 indicating no pain and 10 as worst possible pain. The total score was calculated as the mean of all item ratings. Higher scores indicate more severe pain. Baseline is defined as the last assessment prior to the first dose with a non-missing value, including those from unscheduled visits. Posterior mean change from baseline, 95 percent (%) credible interval (CI) was derived using Bayesian mixed model repeated measures. The data presented as 'Mean' refers to 'posterior mean' and '95% confidence interval' refers to '95% credible intervals'.

Time frame:
Baseline (Day1), Week 2, Week 4, Week 8 and Week 12
Reported as:
Mean · Scores on a Scale
Change From Baseline in the Short-Form Mcgill Pain Questionnaire Total Score Over Time
Scores on a ScalePlaceboGSK3858279 60 mgGSK3858279 360 mg
Week 2-1.39 (-1.80 to -0.97)-1.04 (-1.46 to -0.61)-1.49 (-1.91 to -1.07)
Week 4-1.77 (-2.25 to -1.29)-1.36 (-1.86 to -0.87)-1.44 (-1.95 to -0.94)
Week 8-1.84 (-2.36 to -1.33)-1.99 (-2.53 to -1.46)-1.96 (-2.49 to -1.43)
Week 12-2.07 (-2.65 to -1.49)-2.25 (-2.85 to -1.65)-1.89 (-2.49 to -1.29)
SecondaryChange From Baseline in the Weekly Average of Average Daily Pain Score Over Time, Assessed on the NRS

The change from baseline (CFB) in the weekly average of the average daily pain score at indicated time points was assessed using NRS. Participants recorded their average daily pain response daily using a Brief Pain Inventory Item 5. It is a single item designed for self-reporting average pain score for past 24 hours. Participants were asked to mark their average pain intensity daily, using the NRS, on an 11-point scale (0 = no pain, 10 = worst pain imaginable). The weekly average was computed as weekly average of the average daily scores (range: 0-10), where higher scores indicate more severe pain. A negative CFB indicates pain improvement. Baseline was defined as the average score over the 7 days before dosing (Day - 7 to -1). Posterior mean CFB and the 95% credible interval were derived using a Bayesian mixed model repeated measures analysis. The data presented as 'Mean' refers to the 'posterior mean' and '95% confidence interval' to the '95% credible interval'.

Time frame:
Baseline (Day -7 to Day -1), Week 1, Week 2, Week 3, Week 4, Week 5, Week 6, Week 7, Week 8, Week 9, Week 10, Week 11 and Week 12
Reported as:
Mean · Scores on a Scale
Change From Baseline in the Weekly Average of Average Daily Pain Score Over Time, Assessed on the NRS
Scores on a ScalePlaceboGSK3858279 60 mgGSK3858279 360 mg
Week 1-0.47 (-0.76 to -0.17)-0.57 (-0.87 to -0.27)-0.68 (-0.98 to -0.38)
Week 2-0.71 (-1.10 to -0.32)-0.95 (-1.34 to -0.55)-1.16 (-1.55 to -0.76)
Week 3-0.94 (-1.37 to -0.50)-1.24 (-1.68 to -0.80)-1.50 (-1.94 to -1.06)
Week 4-1.34 (-1.81 to -0.87)-1.42 (-1.90 to -0.94)-1.60 (-2.08 to -1.11)
Week 5-1.54 (-2.09 to -1.00)-1.60 (-2.16 to -1.04)-1.74 (-2.30 to -1.18)
Week 6-1.59 (-2.12 to -1.07)-1.71 (-2.24 to -1.18)-1.73 (-2.26 to -1.20)
Week 7-1.63 (-2.18 to -1.09)-1.91 (-2.46 to -1.35)-1.94 (-2.50 to -1.38)
Week 8-1.72 (-2.27 to -1.18)-2.10 (-2.66 to -1.54)-1.99 (-2.55 to -1.43)
Week 9-1.71 (-2.25 to -1.18)-2.13 (-2.67 to -1.59)-1.94 (-2.49 to -1.40)
Week 10-1.76 (-2.30 to -1.22)-2.31 (-2.86 to -1.76)-2.01 (-2.56 to -1.45)
Week 11-1.88 (-2.44 to -1.32)-2.40 (-2.98 to -1.83)-2.12 (-2.70 to -1.55)
Week 12-1.85 (-2.44 to -1.28)-2.50 (-3.09 to -1.91)-2.07 (-2.67 to -1.48)
SecondaryProportion of Participants With Greater Than or Equal To (>=) 30 Percentage (%) Reduction From Baseline in the Weekly Average of Average Daily Pain Intensity at Week 12, Assessed on the NRS

The proportion of participants who achieved \>=30 percentage reduction from Baseline (responders) in the weekly average of the average daily pain score at Week 12 as measured by NRS is reported. Participants were instructed to assess their average daily pain daily, and to record the response in a Brief Pain Inventory item 5. It is a single item designed to capture information on the self- reported average pain score over the past 24 hours. Participants were asked to mark their pain- intensity daily, using the NRS, on an 11- point scale (0-10), with 0 = no pain, and 10 = worst pain imaginable. The weekly average was computed as weekly average of the average daily scores (range: 0-10), where higher scores indicate more severe pain. The data is presented for proportion of responders where 'Mean' refers to 'posterior mean proportion' and '95% confidence interval' refers to '95% credible interval'.

Time frame:
At Week 12
Reported as:
Mean · Proportion of participants
Proportion of Participants With Greater Than or Equal To (>=) 30 Percentage (%) Reduction From Baseline in the Weekly Average of Average Daily Pain Intensity at Week 12, Assessed on the NRS
Proportion of participantsPlaceboGSK3858279 60 mgGSK3858279 360 mg
Proportion of Participants With Greater Than or Equal To (>=) 30 Percentage (%) Reduction From Baseline in the Weekly Average of Average Daily Pain Intensity at Week 12, Assessed on the NRS0.50 ± 0.380.64 ± 0.520.55 ± 0.43
SecondaryProportion of Participants With Greater Than or Equal To >= 50 % Reduction From Baseline in the Weekly Average of Average Daily Pain Score at Week 12, Assessed on the NRS

The proportion of participants who achieved \>=50 percentage reduction from Baseline (responders) in the weekly average of the average daily pain score at Week 12 as measured by NRS is reported. Participants were instructed to assess their average daily pain daily, and to record the response in a Brief Pain Inventory item 5. It is a single item designed to capture information on the self- reported average pain score over the past 24 hours. Participants were asked to mark their pain- intensity daily, using the NRS, on an 11- point scale (0-10), with 0 = no pain, and 10 = worst pain imaginable. The weekly average was computed as weekly average of the average daily scores (range: 0-10), where higher scores indicate more severe pain. The data is presented for proportion of responders where 'Mean' refers to 'posterior mean proportion' and '95% confidence interval' refers to '95% credible interval'.

Time frame:
At Week 12
Reported as:
Mean · Proportion of participants
Proportion of Participants With Greater Than or Equal To >= 50 % Reduction From Baseline in the Weekly Average of Average Daily Pain Score at Week 12, Assessed on the NRS
Proportion of participantsPlaceboGSK3858279 60 mgGSK3858279 360 mg
Proportion of Participants With Greater Than or Equal To >= 50 % Reduction From Baseline in the Weekly Average of Average Daily Pain Score at Week 12, Assessed on the NRS0.28 ± 0.190.40 ± 0.290.32 ± 0.22

Adverse events

Collected over All-cause mortality, Serious Adverse Events (SAEs) and non-Serious Adverse Events (non-SAEs) were collected from the start of the study intervention (Day 1) until follow up of week 27.. Non-serious events are listed at a 5% frequency threshold.

Adverse event summary by group
GroupDeathsSeriousOther
Placebo0/48 (0%)4/48 (8.3%)11/48 (22.9%)
GSK3858279 60 Milligram (mg) Weekly0/48 (0%)2/48 (4.2%)9/48 (18.8%)
GSK3858279 360 mg Weekly0/48 (0%)0/48 (0%)10/48 (20.8%)
Most frequent serious events
Most frequent serious events
EventPlaceboGSK3858279 60 Milligram (mg) WeeklyGSK3858279 360 mg Weekly
Angina unstableCardiac disorders1/480/480/48
Cat scratch diseaseInfections and infestations1/480/480/48
PneumoniaInfections and infestations1/480/480/48
Uterine cancerNeoplasms benign, malignant and unspecified (incl cysts and polyps)0/481/480/48
HemianopiaNervous system disorders0/481/480/48
EpistaxisRespiratory, thoracic and mediastinal disorders1/480/480/48
Pulmonary embolismRespiratory, thoracic and mediastinal disorders0/481/480/48
Most frequent other events
Most frequent other events
EventPlaceboGSK3858279 60 Milligram (mg) WeeklyGSK3858279 360 mg Weekly
HeadacheNervous system disorders5/482/482/48
COVID-19Infections and infestations0/484/481/48
Injection site haemorrhageGeneral disorders0/480/483/48
BronchitisInfections and infestations1/481/483/48
Upper respiratory tract infectionInfections and infestations3/482/480/48
ArthralgiaMusculoskeletal and connective tissue disorders3/480/480/48
Muscle spasmsMusculoskeletal and connective tissue disorders0/483/480/48
DizzinessNervous system disorders0/480/483/48

Baseline characteristics

The analysis was performed on the Full Analysis Set (FAS) set that included all randomized participants who received at least one dose of study intervention.

Age, Continuous
Age, Continuous(YEARS)PlaceboGSK3858279 60 mgGSK3858279 360 mgTotal
Mean61.3 ± 8.5960.1 ± 10.1860.2 ± 9.2660.5 ± 9.32
Sex: Female, Male
Sex: Female, Male(Participants)PlaceboGSK3858279 60 mgGSK3858279 360 mgTotal
Female21192262
Male27292682
Race/Ethnicity, Customized
Race/Ethnicity, Customized(Participants)PlaceboGSK3858279 60 mgGSK3858279 360 mgTotal
White30242579
American Indian or Alaska Native0202
Asian15121441
Black or African American18918
Mixed race1102
Not reported0101
Unknown1001
08

Study locations

81 sites
  • GSK Investigational Site
    Anniston, Alabama 36207, United States
  • GSK Investigational Site
    Surprise, Arizona 85378, United States
  • GSK Investigational Site
    Cerritos, California 90703, United States
  • GSK Investigational Site
    Lomita, California 90717, United States
  • GSK Investigational Site
    Largo, Florida 33777, United States
  • GSK Investigational Site
    Miami, Florida 33135, United States
  • GSK Investigational Site
    Miami, Florida 33175, United States
  • GSK Investigational Site
    West Palm Beach, Florida 33401, United States
  • GSK Investigational Site
    Decatur, Georgia 30030, United States
  • GSK Investigational Site
    Chicago, Illinois 60611, United States
  • GSK Investigational Site
    Waltham, Massachusetts 02451, United States
  • GSK Investigational Site
    Williamsville, New York 14221, United States
  • GSK Investigational Site
    Huntersville, North Carolina 28078, United States
  • GSK Investigational Site
    Lancaster, South Carolina 29720, United States
  • GSK Investigational Site
    Cypress, Texas 77429, United States
  • GSK Investigational Site
    DeSoto, Texas 75154, United States
  • GSK Investigational Site
    Houston, Texas 77030, United States
  • GSK Investigational Site
    McAllen, Texas 78501, United States
  • GSK Investigational Site
    Bellevue, Washington 98007, United States
  • GSK Investigational Site
    New Westminster, British Columbia V3L 3W4, Canada
  • GSK Investigational Site
    Vancouver, British Columbia V5Y 3W2, Canada
  • GSK Investigational Site
    Winnipeg, Manitoba R3C 0N2, Canada
  • GSK Investigational Site
    Toronto, Ontario L6S 0C6, Canada
  • GSK Investigational Site
    Toronto, Ontario M5G 2C4, Canada
  • GSK Investigational Site
    Beijing, 100032, China
  • GSK Investigational Site
    Guangzhou, 510000, China
  • GSK Investigational Site
    Harbin, 150001, China
  • GSK Investigational Site
    Luoyang, 471003, China
  • GSK Investigational Site
    Shanghai, 200032, China
  • GSK Investigational Site
    Wuhan, 430030, China
  • GSK Investigational Site
    Yueyang, 414000, China
  • GSK Investigational Site
    Corbeil-Essonnes, 91100, France
  • GSK Investigational Site
    Mulhouse, 68100, France
  • GSK Investigational Site
    Bad Homburg, 61348, Germany
  • GSK Investigational Site
    Mainz, 55128, Germany
  • GSK Investigational Site
    Münster, 48145, Germany
  • GSK Investigational Site
    Wallerfing, 94574, Germany
  • GSK Investigational Site
    Chiba, 260-0804, Japan
  • GSK Investigational Site
    Fukuoka, 807-8556, Japan
  • GSK Investigational Site
    Gunma, 370-3573, Japan
  • GSK Investigational Site
    Hokkaido, 060-0061, Japan
  • GSK Investigational Site
    Ibaraki, 300-0028, Japan
  • GSK Investigational Site
    Kanagawa, 211-8533, Japan
  • GSK Investigational Site
    Osaka, 565-0853, Japan
  • GSK Investigational Site
    Tochigi, 321-0204, Japan
  • GSK Investigational Site
    Tochigi, 321-0974, Japan
  • GSK Investigational Site
    Tochigi, 322-8550, Japan
  • GSK Investigational Site
    Tokyo, 103-0027, Japan
  • GSK Investigational Site
    Tokyo, 104-0031, Japan
  • GSK Investigational Site
    Tokyo, 143-0015, Japan
  • GSK Investigational Site
    Tokyo, 160-0008, Japan
  • GSK Investigational Site
    Częstochowa, 42-217, Poland
  • GSK Investigational Site
    Gdynia, 81-338, Poland
  • GSK Investigational Site
    Katowice, 40-081, Poland
  • GSK Investigational Site
    Katowice, 40-282, Poland
  • GSK Investigational Site
    Katowice, 40-648, Poland
  • GSK Investigational Site
    Katowice, 40-749, Poland
  • GSK Investigational Site
    Skorzewo, 60-185, Poland
  • GSK Investigational Site
    Sochaczew, 96-500, Poland
  • GSK Investigational Site
    Warsaw, 02-117, Poland
  • GSK Investigational Site
    Cape Town, 7530, South Africa
  • GSK Investigational Site
    Johannesburg, 2196, South Africa
  • GSK Investigational Site
    KwaDukuza, 4450, South Africa
  • GSK Investigational Site
    Pretoria, 0184, South Africa
  • GSK Investigational Site
    Somerset West, 7130, South Africa
  • GSK Investigational Site
    Bucheon-si, 422711, South Korea
  • GSK Investigational Site
    Daejeon, 35233, South Korea
  • GSK Investigational Site
    Seoul, 120-752, South Korea
  • GSK Investigational Site
    Seoul, 136-705, South Korea
  • GSK Investigational Site
    Seoul, 137-701, South Korea
  • GSK Investigational Site
    Seoul, South Korea
  • GSK Investigational Site
    A Coruña, 15006, Spain
  • GSK Investigational Site
    Barcelona, 08023, Spain
  • GSK Investigational Site
    Málaga, 29010, Spain
  • GSK Investigational Site
    Palma de Mallorca, 07120, Spain
  • GSK Investigational Site
    San SebastiAn de Los Rey, 28702, Spain
  • GSK Investigational Site
    Torrevieja Alicante, 3186, Spain
  • GSK Investigational Site
    Cannock, WS11 0BN, United Kingdom
  • GSK Investigational Site
    Liverpool, L9 7AL, United Kingdom
  • GSK Investigational Site
    Teesside, TS17 6EW, United Kingdom
  • GSK Investigational Site
    West Yorkshire, LS10 1DU, United Kingdom
09

References and documents

Study documents

  • Study protocol · Mar 26, 2024
  • Statistical analysis plan · Jan 30, 2025

Documents are hosted by the registry — open the source record to download them.

Individual participant data

Plan to share: No — Qualified researchers may request access to anonymized individual patient-level data (IPD) and related study documents of the eligible studies via the Data Sharing Portal. Details on GSK's data sharing criteria can be found at: https://www.gsk.com/en-gb/innovation/trials/data-transparency/

10

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Nov 21, 2025, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
11

Registry details

Key details

Study ID
NCT05838755
Lead sponsor
GlaxoSmithKline
Responsible party
Sponsor
First posted
May 3, 2023
Start date
Sep 20, 2023
Primary completion
Oct 14, 2024
Completion
Feb 17, 2025
Results posted
Nov 21, 2025
Last update
Nov 21, 2025

Study contacts

GSK Clinical Trials
study director · GlaxoSmithKline

Oversight

Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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This study is terminated, as verified in Nov 2025. You cannot join it, but the record below documents what was studied.

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