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Table 2 Summary of Antidrug Antibody Evaluations in study patients (Immunogenicity Population)

From: Comparing immunogenicity and safety following transition from reference rituximab to biosimilar rituximab (DRL_RI) in patients with rheumatoid arthritis: a randomized, double-blind, phase 3 study

Visit

DRL_RI

(N = 69)

RP/RMP

(N = 68)

Total

(N = 137)

Baseline

 ADA Positive, n (%)

3 (4.3)

1 (1.5)

4 (2.9)

 NAb Positive, n (%)

0

0

0

 Titre: Median [Q1, Q3]

360 [180, 720]

360 [360, 360]

360 [270, 540]

Day 15

 ADA Positive, n (%)

1 (1.4)

0

1 (0.7)

 NAb Positive, n (%)

0

0

0

 Titre: Median [Q1, Q3]

180 [180, 180]

-

180 [180, 180]

Week 4

 ADA Positive, n (%)

0

0

0

 NAb Positive, n (%)

0

0

0

 Titre: Median [Q1, Q3]

0

0

0

Week 8

 ADA Positive, n (%)

1 (1.4)

0

1 (0.7)

 NAb Positive, n (%)

1 (1.4)

0

1 (0.7)

 Titre: Median [Q1, Q3]

1440 [1440, 1440]

-

1440 [1440, 1440]

Week 12 (end of study)

 ADA Positive, n (%)

1 (1.4)

2 (2.9)

3 (2.2)

 NAb Positive, n (%)

0

0

0

 Titre: Median [Q1, Q3]

720 [720, 720]

540 [360, 720]

720 [360, 720]

  1. Abbreviations: ADA: anti-drug antibody; EU-rituximab: European Union approved rituximab (MabThera®); Nab: neutralizing antibody; Q1: first quartile; Q3: third quartile; US-rituximab: United States licensed rituximab (Rituxan®)