Adults 18 to 65, any sex, with Rheumatoid Arthritis. Patients with the condition only — healthy volunteers not accepted.
Results — posted to ClinicalTrials.gov
Per-arm endpoint measurements with 95% confidence intervals where reported. Source: trial results section.
Number of Participants With One or More Treatment-Emergent Adverse Events (TEAEs) or Adverse Events of Special Interest (AESIs) or Any Serious AEs (SAEs) in Part APrimary· Up to 6 Weeks
TEAEs are any untoward medical occurrence that either occurs or worsens at any time after treatment baseline, and in the opinion of the investigators is possibly related to study drug. Skin Rash was the only event that was considered an AESI. A serious AE is defined as an event that results in death, initial or prolonged hospitalization, is life-threatening, leads to persistent or significant disability/incapacity, is associated with congenital anomaly/birth defect, or is considered significant by the investigator for any other reason. A summary of SAEs and other non-serious AEs, regardless of
TEAEs
Group
Value
95% CI
Part A: Placebo
3
Part A: 5 mg LY3337641
1
Part A: 10 mg LY3337641
6
Part A: 30 mg LY3337641
2
AESIs
Group
Value
95% CI
Part A: Placebo
0
Part A: 5 mg LY3337641
0
Part A: 10 mg LY3337641
0
Part A: 30 mg LY3337641
0
SAEs
Group
Value
95% CI
Part A: Placebo
0
Part A: 5 mg LY3337641
0
Part A: 10 mg LY3337641
0
Part A: 30 mg LY3337641
0
Percentage of Participants Achieving American College of Rheumatology 20% (ACR20) Response in Part BPrimary· Week 12
ACR20 Responder Index is a composite of clinical, laboratory, and functional measures in rheumatoid arthritis (RA). "ACR20 Responder" is a participant who has at least 20% improvement in both tender and swollen joint counts and in at least 3 of the following 5 criteria: Physician's Global Assessment of Disease Activity, Patient's Global Assessment of Disease Activity, Patient's Global Assessment of Arthritis Pain using visual analog scale (VAS), Health Assessment Questionnaire - Disability Index (HAQ-DI) and high-sensitivity C-reactive protein (hsCRP). Participants with missing responses and /
Group
Value
95% CI
Part B: Placebo
48.1
34.8 – 61.5
Part B: 5 mg LY3337641
55.4
42.3 – 68.4
Part B: 10 mg LY3337641
44.2
30.7 – 57.7
Part B: 30 mg LY3337641
50.9
37.7 – 64.1
Percentage of Participants Achieving American College of Rheumatology 50% (ACR50) Response in Part BSecondary· Week 12
ACR50 Responder Index is composite of clinical, laboratory, and functional measures in RA. "ACR50 Responder" is a participant who has at least 50% improvement in both tender and swollen joint counts and in at least 3 of the following 5 criteria:
Physician's Global Assessment of Disease Activity, Patient's Global Assessment of Disease Activity, Patient's Global Assessment of Arthritis Pain using VAS, HAQ-DI and hsCRP. Participants with missing responses and/or participants who discontinue study or drug before analysis timepoint are deemed non-responders.
Group
Value
95% CI
Part B: Placebo
27.8
15.8 – 39.7
Part B: 5 mg LY3337641
25.0
13.7 – 36.3
Part B: 10 mg LY3337641
15.4
5.6 – 25.2
Part B: 30 mg LY3337641
29.1
17.1 – 41.1
Percentage of Participants Achieving American College of Rheumatology 70% (ACR70) Response in Part BSecondary· Week 12
ACR70 Responder Index is composite of clinical, laboratory, and functional measures in RA. "ACR70 Responder" is a participant who has at least 70% improvement in both tender and swollen joint counts and in at least 3 of the following 5 criteria:
Physician's Global Assessment of Disease Activity, Patient's Global Assessment of Disease Activity, Patient's Global Assessment of Arthritis Pain using VAS, HAQ-DI and hsCRP. Participants with missing responses and/or participants who discontinue study or drug before analysis timepoint are deemed non-responders.
Group
Value
95% CI
Part B: Placebo
16.7
6.7 – 26.6
Part B: 5 mg LY3337641
8.9
1.5 – 16.4
Part B: 10 mg LY3337641
1.9
0.0 – 5.7
Part B: 30 mg LY3337641
16.4
6.6 – 26.1
Change From Baseline in the Disease Activity Score (DAS) 28-high-sensitivity C-reactive Protein (hsCRP) in Part BSecondary· Baseline, Week 12
Disease Activity Score (DAS) modified to include 28 joint count (DAS28) consisted of composite score of following variables: tender joint count (TJC28), swollen joint count (SJC28), C-reactive protein (CRP) (milligrams per liter), and Patient's Global Assessment of Disease Activity using VAS. DAS28 was calculated using following formula: DAS28-CRP=0.56\*square root (sqrt)(TJC28)+0.28\*sqrt(SJC28)+0.36\*natural log(CRP+1)+0.014\*Patient's Global VAS+0.96. Scores ranged 1.0-9.4, where lower scores indicated less disease activity.
Group
Value
95% CI
Part B: Placebo
-1.62
± 1.447
Part B: 5 mg LY3337641
-1.55
± 1.182
Part B: 10 mg LY3337641
-1.24
± 1.146
Part B: 30 mg LY3337641
-1.80
± 1.453
Percentage of Participants Who Achieve Low Disease Activity Using DAS28-hsCRP in Part BSecondary· Week 12
Disease Activity Score (DAS) modified to include 28 joint count (DAS28) consisted of composite score of following variables: tender joint count (TJC28), swollen joint count (SJC28), C-reactive protein (CRP) (milligrams per liter), and Patient's Global Assessment of Disease Activity using VAS. DAS28 was calculated using following formula: DAS28-CRP=0.56\*square root (sqrt)(TJC28)+0.28\*sqrt(SJC28)+0.36\*natural log(CRP+1)+0.014\*Patient's Global VAS+0.96. Scores ranged 1.0-9.4, where lower scores indicated less disease activity.
Group
Value
95% CI
Part B: Placebo
27.8
15.8 – 39.7
Part B: 5 mg LY3337641
32.1
19.9 – 44.4
Part B: 10 mg LY3337641
21.2
10.1 – 32.3
Part B: 30 mg LY3337641
29.1
17.1 – 41.1
Percentage of Participants Who Achieve Clinical Remission Using DAS28-hsCRP in Part BSecondary· Week 12
Disease Activity Score (DAS) modified to include 28 joint count (DAS28) consisted of composite score of following variables: tender joint count (TJC28), swollen joint count (SJC28), C-reactive protein (CRP) (milligrams per liter), and Patient's Global Assessment of Disease Activity using visual analog scale (VAS) (participant global VAS). DAS28 was calculated using following formula: DAS28-CRP=0.56\*square root (sqrt)(TJC28)+0.28\*sqrt(SJC28)+0.36\*natural log(CRP+1)+0.014\*Patient's Global VAS+0.96. Clinical remission is defined as DAS28-hsCRP \<2.6.
Group
Value
95% CI
Part B: Placebo
20.4
9.6 – 31.1
Part B: 5 mg LY3337641
19.6
9.2 – 30.0
Part B: 10 mg LY3337641
7.7
0.4 – 14.9
Part B: 30 mg LY3337641
25.5
13.9 – 37.0
Pharmacokinetics (PK): Clearance Parameter of LY3337641Secondary· Part A: Weeks 1, 2, and 4, Day 1 (0.5 to 2 hours postdose); Part B: Weeks 2, 4, 8, and 12, Day 1 (0.5 to 2 hours postdose)
Apparent total body clearance of drug after oral administration based on population PK analysis was evaluated. As prespecified per protocol, an overall population estimate of clearance is generated and data from Part A and B were combined for the analysis. The sparse data was then analyzed using population PK methods in Non linear Mixed Effects Model (NONMEM) to generate an overall population estimate of clearance.
Group
Value
95% CI
LY3337641
29.1
± 5.9
Adverse events — posted to ClinicalTrials.gov
Time frame: Up to 88 Weeks.
Reporting threshold: 5%.
Adverse-event reports describe events observed during the trial — not all are caused by the drug.
NCT03083561 — A Study of LY3337641 in Japanese and Caucasian Healthy Participants
· Phase 1
· completed
Other recruiting trials for Rheumatoid Arthritis
Currently open trials in the same condition.
NCT07433335 — A Study to Assess the Safety and Tolerability of SR-878 in Patients With Rheumatoid Arthritis
· Phase 1
· recruiting
NCT07491016 — Efficacy and Safety of Telitacicept Combined With Baricitinib for Refractory Rheumatoid Arthritis
· recruiting
NCT07171983 — A Study to Evaluate the Safety, Tolerability, and Drug Levels of BMS-986454 in Participants With Rheumatoid Arthritis
· Phase 1
· recruiting
NCT07246096 — Exploratory Clinical Study on the Safety and Efficacy of Anti- CD19/BCMA U CAR-T Cell Injection for the Treatment of Rel
· EARLY_PHASE1
· recruiting
NCT07363590 — A Clinical Study of MK-1045 in People With Lupus or Rheumatoid Arthritis (MK-1045-004)
· Phase 1
· recruiting
Other Eli Lilly and Company trials
Trials by the same sponsor.
NCT07533006 — A Study of LY4005130 in Adult Participants With Severe Alopecia Areata (Hair Loss)
· Phase 2
· not yet recruiting
NCT07533019 — A Study of LY4005130 in Adult Participants With Non-Segmental Vitiligo
· Phase 2
· not yet recruiting
NCT07247357 — A Study of LY4064809 in Healthy Adult Chinese Participants
· Phase 1
· completed
NCT07124013 — A Study of Olomorasib (LY3537982) in Healthy Japanese Participants
· Phase 1
· completed
NCT07030127 — A Study of LY3985863 in Healthy Participants
· Phase 1
· completed
Publications: Europe PMC API search by NCT ID, retrieved 10 June 2026
Drug + disease cross-links: matched in real time against Drug Landscape's normalised drug + company + condition tables
Sponsor: as reported to ClinicalTrials.gov by Eli Lilly and Company
Last refreshed: 9 October 2019
Drug Landscape aggregates and links these public records for informational use only. Always verify against the primary source before clinical or regulatory decisions. Canonical URL: https://druglandscape.com/trial/NCT02628028.