Study design1*

Graphic depicting the study design for the GOMOSDI biosimilarity clinical trial
  • Multicenter, double-blind, parallel-group, active-control, randomized study evaluating the efficacy, safety, and immunogenicity of GOMOSDI and Simponi in adults with moderate to severe rheumatoid arthritis receiving methotrexate
  • Stage 1: 502 patients randomized 1:1 to GOMOSDI or Simponi administered every 4 weeks until Week 12
  • Stage 2: responders (DAS28-CRP decreased by >0.6 from baseline and disease activity DAS28-CRP ≤5.1) initially receiving Simponi were rerandomized 1:1 at Week 16 to continue receiving Simponi (n=113) or were switched to GOMOSDI (n=112), and patients initially receiving GOMOSDI (n=223) continued on GOMOSDI
  • At Week 16, patients who were nonresponsive (DAS28-CRP decreased by ≤0.6 from baseline or disease activity DAS28-CRP >5.1) were withdrawn from the study and followed for additional efficacy, safety, and immunogenicity assessments until Week 24
  • At end of study at Week 52, responders underwent final study assessments

Primary endpoint1

  • Change from baseline in DAS28-CRP score at Week 16

Select secondary endpoints1

  • Change from baseline in DAS28-CRP score at additional time points through Week 52
  • Comparisons of pharmacokinetics, immunogenicity, and safety

*Study used EU-approved Simponi.

The DAS28-CRP is a validated, sensitive assessment offering a continuous, objective measure of patients’ response to treatment.1,2

DAS28-CRP=Disease Activity Score-28 for Rheumatoid Arthritis with C-reactive protein; RA=rheumatoid arthritis.

GOMOSDI demonstrated highly similar improvements in DAS28-CRP to Simponi1

CHANGE FROM BASELINE IN DAS28-CRP SCORE TO WEEK 16*

Chart depicting the change from baseline in DAS28-CRP score to week 16 in the biosimilarity study
  • Change from baseline in DAS28-CRP score at Week 16 (primary endpoint) was -2.89 (SE, 0.058) in the GOMOSDI group and -2.98 (SE, 0.058) in the Simponi group (90% CI, -0.05 to 0.22; 95% CI, -0.07 to 0.25)

CHANGE FROM BASELINE IN DAS28-CRP SCORE FROM WEEK 16 TO WEEK 52*

Chart depicting the change from baseline in DAS28-CRP score from week 16 to week 52 in the biosimilarity study
  • Changes from baseline were similar in patients who switched from Simponi to GOMOSDI and in those who continued on their original treatments from Week 16 through Week 52

*Study used EU-approved Simponi.

CI=confidence interval; DAS28-CRP=Disease Activity Score-28 for Rheumatoid Arthritis with C-reactive protein; SD=standard deviation; SE=standard error.

Pharmacokinetics equivalence was demonstrated out to Week 521

MEAN SERUM TROUGH GOLIMUMAB CONCENTRATIONS FROM BASELINE TO WEEK 16*

Chart showing similar mean golimumab serum concentrations for GOMOSDI and Simponi through Week 16 of the biosimilarity study

MEAN SERUM TROUGH GOLIMUMAB CONCENTRATIONS OVER TIME*

Chart showing similar mean golimumab serum concentrations for GOMOSDI and Simponi through Week 52 of the biosimilarity study

*Study used EU-approved Simponi.

GOMOSDI maintained a comparable immunogenicity profile to Simponi out to 52 weeks1*

IMMUNOGENICITY RESULTS FROM BASELINE TO 52 WEEKS*

Chart showing immunogenicity results from the biosimilarity study through week 52

During the first 16 weeks of treatment

ADAs and NAbs were similar in both treatment groups.

Treatment-emergent ADAs
  • 54.1% in GOMOSDI-treated patients
  • 58.3% in Simponi-treated patients

From Week 16 through Week 52

ADAs and NAbs remained consistent, including in patients who were switched from Simponi to GOMOSDI.

Treatment-emergent ADAs
  • 21.3% in GOMOSDI-treated patients
  • 18.2% in Simponi-treated patients
  • 25.7% in patients who switched
Treatment-emergent NAbs
  • 46.2% in GOMOSDI-treated patients
  • 48.8% in Simponi-treated patients
Treatment-emergent NAbs
  • 5.3% in GOMOSDI-treated patients
  • 12.5% in Simponi-treated patients
  • 33.3% in patients who switched

*Study used EU-approved Simponi.

Calculated from patients with treatment-emergent ADAs.

ADA=antidrug antibody; NAb=neutralizing antibody.

GOMOSDI and Simponi had no clinically meaningful differences in safety1,2

TEAEs*

Stage 1 (Weeks 1-16)
n (%)
Stage 2 (Weeks 16-52)
n (%)
GOMOSDI
n=251
Simponi
n=251
GOMOSDI/
GOMOSDI
n=223
Simponi/
GOMOSDI
n=112
Simponi/
Simponi
n=113
Any TEAE 96 (38.2) 105 (41.8) 114 (51.1) 65 (58.0) 65 (57.5)
Treatment-related TEAEs 19 (7.6) 28 (11.2) 15 (6.7) 12 (10.7) 18 (15.9)
TEAEs leading to discontinuation from study treatment phase 4 (1.6) 1 (0.4) 2 (0.9) 2 (1.8) 5 (4.4)
TEAEs of special interest 48 (19.1) 38 (15.1) 57 (25.6) 36 (32.1) 32 (28.3)
TEAEs by primary system organ class and preferred term
Infections and infestations 53 (21.1) 56 (22.3) 67 (30.0) 41 (36.6) 38 (33.6)
Urinary tract infection 10 (4.0) 20 (8.0) 15 (6.7) 6 (5.4) 10 (8.8)
Upper respiratory tract infection 9 (3.6) 10 (4.0) 16 (7.2) 11 (9.8) 9 (8.0)
Nasopharyngitis 11 (4.4) 7 (2.8) 9 (4.0) 6 (5.4) 4 (3.5)
Bacteriuria 6 (2.4) 1 (0.4)
Pharyngitis 1 (0.4) 5 (2.0) 3 (1.3) 2 (1.8) 4 (3.5)
Bronchitis 2 (0.8) 3 (1.2) 6 (2.7) 1 (0.9) 1 (0.9)
COVID-19 3 (1.2) 2 (0.8)
Influenza 3 (1.2) 2 (0.8) 6 (2.7) 3 (2.7) 2 (1.8)
Sinusitis 3 (1.2) 2 (0.8) 1 (0.4) 3 (2.7)
Oral herpes 1 (0.4) 3 (1.2) 1 (0.4) 3 (2.7) 3 (2.7)
Pneumonia 1 (0.4) 0 (0.0) 4 (3.5)
Laryngitis 1 (0.4) 2 (1.8) 1 (0.9)
Pulpitis dental 2 (1.8)
Rhinitis 2 (1.8)
Metabolism and nutrition disorders 9 (3.6) 11 (4.4) 8 (3.6) 6 (5.4) 8 (7.1)
Hypercholesterolemia 4 (1.8) 1 (0.9) 1 (0.9)
Hyperlipidemia 1 (0.4) 2 (1.8)
Nervous system disorders 8 (3.6) 8 (7.1) 5 (4.4)
Headache 2 (0.9) 4 (3.6) 1 (0.9)
Sciatica 3 (1.3) 1 (0.9) 3 (2.7)
General disorders and
administration-site conditions
4 (1.6) 10 (4.0) 4 (3.6) 3 (2.7)
Injection-site reaction 1 (0.4) 8 (3.2)
Asthenia 2 (1.8) 1 (0.9)
Blood and lymphatic system disorders 7 (2.8) 4 (1.6) 4 (1.8) 2 (1.8) 3 (2.7)
Anemia 3 (1.2) 3 (1.2) 2 (0.9) 1 (0.9) 2 (1.8)
Injury, poisoning, and procedural complications 4 (1.6) 7 (2.8) 2 (0.9) 4 (3.6) 2 (1.8)
Vascular disorders 5 (2.0) 5 (2.0) 8 (3.6) 4 (3.6) 4 (3.5)
Hypertension 5 (2.0) 5 (2.0) 6 (2.7) 2 (1.8) 4 (3.5)
Musculoskeletal and connective tissue disorders 5 (2.0) 3 (1.2) 11 (4.9) 4 (3.6) 9 (8.0)
Rheumatoid arthritis 5 (2.2) 1 (0.9)
Arthralgia 3 (1.3) 2 (1.8)
Back pain 2 (1.8)
Renal and urinary disorders 4 (1.6) 3 (1.2) 7 (3.1) 2 (1.8) 5 (4.4)
Cystitis noninfective 3 (1.3)
Renal cyst 3 (2.7)
Gastrointestinal disorders 4 (1.6) 3 (1.2) 4 (1.8) 2 (1.8) 6 (5.3)
Skin and subcutaneous tissue disorders 3 (1.2) 2 (0.8) 8 (3.6) 3 (2.7) 3 (2.7)
Respiratory, thoracic, and mediastinal disorders 5 (2.0)
Hepatobiliary disorders 3 (1.3) 2 (1.8) 3 (2.7)
Cholelithiasis 1 (0.4) 2 (1.8)
Reproductive system and breast disorders 2 (0.9) 2 (1.8) 3 (2.7)
Benign prostatic hyperplasia 2 (1.8)
Neoplasms benign, malignant, and unspecified
(including cysts and polyps)
1 (0.4) 1 (0.9) 3 (2.7)
Any TEAE
Treatment-related TEAEs
TEAEs leading to discontinuation from study treatment phase
TEAEs of special interest
TEAEs by primary system organ class and preferred term
Infections and infestations
Urinary tract infection
Upper respiratory tract infection
Nasopharyngitis
Bacteriuria
Pharyngitis
Bronchitis
COVID-19
Influenza
Sinusitis
Oral herpes
Pneumonia
Laryngitis
Pulpitis dental
Rhinitis
Metabolism and nutrition disorders
Hypercholesterolemia
Hyperlipidemia
Nervous system disorders
Headache
Sciatica
General disorders and administration-site conditions
Injection-site reaction
Asthenia
Blood and lymphatic system disorders
Anemia
Injury, poisoning, and procedural complications
Vascular disorders
Hypertension
Musculoskeletal and connective tissue disorders
Rheumatoid arthritis
Arthralgia
Back pain
Renal and urinary disorders
Cystitis noninfective
Renal cyst
Gastrointestinal disorders
Skin and subcutaneous tissue disorders
Respiratory, thoracic, and mediastinal disorders
Hepatobiliary disorders
Cholelithiasis
Reproductive system and breast disorders
Benign prostatic hyperplasia
Neoplasms benign, malignant, and unspecified (including cysts and polyps)

During the first 16 weeks of treatment

Most TEAEs were mild in nature, with a similar percentage of patients across treatment groups reporting TEAEs.

From Week 16 through end of study

The safety profiles of the treatment groups were comparable, including those patients who were switched from Simponi to GOMOSDI at Week 16.


*Study used EU-approved Simponi.

TEAE=treatment-emergent adverse event.

SEE THE GOMOSDI AUTOINJECTOR

REFERENCES:

1. Luque M, Zhelyazkova K, Vashishta L, et al. Efficacy and safety of biosimilar AVT05 versus reference product golimumab in combination with
methotrexate in moderate-to-severe rheumatoid arthritis: 52-week results of a randomized, parallel-group, double-blind study. BioDrugs.
2026;40(1):135-149. 2. Wells G, Becker J-C, Teng J, et al. Validation of the 28-joint Disease Activity Score (DAS28) and European League Against Rheumatism response criteria based on C-reactive protein against disease progression in patients with rheumatoid arthritis, and comparison with the DAS28 based on erythrocyte sedimentation rate. Ann Rheum Dis. 2009;68(6):954-960.

REFERENCE:

1. Luque M, Zhelyazkova K, Vashishta L, et al. Efficacy and safety of biosimilar AVT05 versus reference product golimumab in combination with methotrexate in moderate-to-severe rheumatoid arthritis: 52-week results of a randomized, parallel-group, double-blind study. BioDrugs. 2026;40(1):135-149.

REFERENCE:

1. Luque M, Zhelyazkova K, Vashishta L, et al. Efficacy and safety of biosimilar AVT05 versus reference product golimumab in combination with methotrexate in moderate-to-severe rheumatoid arthritis: 52-week results of a randomized, parallel-group, double-blind study. BioDrugs. 2026;40(1):135-149.

REFERENCE:

1. Luque M, Zhelyazkova K, Vashishta L, et al. Efficacy and safety of biosimilar AVT05 versus reference product golimumab in combination with methotrexate in moderate-to-severe rheumatoid arthritis: 52-week results of a randomized, parallel-group, double-blind study. BioDrugs. 2026;40(1):135-149.

REFERENCES:

1. Luque M, Zhelyazkova K, Vashishta L, et al. Efficacy and safety of biosimilar AVT05 versus reference product golimumab in combination with methotrexate in moderate-to-severe rheumatoid arthritis: 52-week results of a randomized, parallel-group, double-blind study. BioDrugs. 2026;40(1):135-149. 2. Luque M, Zhelyazkova K, Vashishta L, et al. Efficacy and safety of biosimilar AVT05 versus reference product golimumab in combination with methotrexate in moderate-to-severe rheumatoid arthritis: 52-week results of a randomized, parallel-group, double-blind study (supplement). BioDrugs. Accessed January 21, 2026. https://static-content.springer.com/esm/art%3A10.1007%2Fs40259-025-00748-8/MediaObjects/40259_2025_748_MOESM1_ESM.pdf