Abstract
Objective
We aimed to investigate the efficacy of anti-IL-6 receptor antibody (aIL-6) and other biologic disease-modifying antirheumatic drugs (bDMARDs), such as TNF inhibitor and CTLA4-Ig in the treatment of rheumatoid arthritis (RA) in patients with knee joint involvement.
Methods
We retrospectively analyzed 1059 treatment courses of patients with RA who visited our hospitals and were treated with bDMARDs. We categorized them into two groups, with or without knee joint involvement. We investigated the clinical disease activity index (CDAI) at baseline and 12 weeks after the initiation of bDMARDs. We compared the improvement of the markers between aIL-6 and other bDMARDs.
Results
Treatment with aIL-6 significantly increased ΔCDAI (n = 91, 15.4 ± 1.1; mean ± SEM) in patients with knee joint involvement, compared to other bDMARDs (n = 232, 11.0 ± 0.7) at 12 weeks (P = 0.006). Following the multivariate analysis adjusted by the CDAI levels at baseline, age, gender, concomitant use of methotrexate, and the first use of bDMARDs, ΔCDAI levels were significantly higher in aIL-6, compared to other bDMARDs (P = 0.02). However, there was no significant difference in ΔCDAI improvement between aIL-6 (n = 162, 5.9 ± 0.6) and other bDMARDs (n = 573, 6.2 ± 0.4) in patients without swollen knee joints. ΔCDAI levels were equally increased in patients with shoulder and elbow joint involvement.
Conclusion
aIL-6 was more effective in the patients with RA and knee joint involvement, compared to other bDMARDs.
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Acknowledgements
We thank all the physicians who evaluated detailed joint findings at Kyoto University Hospital, Osaka Medical College Hospital, Osaka Red Cross Hospital, Kansai Medical University Hospital, Kobe University Hospital, Nara Medical University Hospital and Osaka University Hospital. English language editing was performed by editage.
Funding
ANSWER Cohort is supported by grants from pharmaceutical companies (Abbie G.K., Asahi-Kasei Pharma, AYUMI Pharmaceutical Co., Chugai Pharmaceutical Co. Ltd., Eisai Co. Ltd., Janssen Pharmaceutical K.K., Ono Pharmaceutical Co., Sanofi, UCB Japan Co. Ltd., Teijin Healthcare Limited) and an information technology services company (CAC). These companies had no roles in study design, data collection, data analysis, data interpretation or writing of the manuscript.
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Conceived and designed the study: YM. Analyzed the data: YM, collection of data: YM, TH, KE, RH, MH, WY, KM, TK, KH, YS, HA, AO, SJ, MK, AK. YM prepared the initial draft of the manuscript. All the authors were involved in revising the manuscript critically for content. All authors read and approved the final manuscript as submitted and agree to be accountable for all aspects of the work.
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YM received a research grant and/or speaker fee from Eli Lilly Japan K.K., Chugai Pharmaceutical Co. Ltd., Pfizer Inc., Bristol Myers Squibb, and Mitsubishi Tanabe Pharma Corporation. TH received a speaker fee from GlaxoSmithKline, Chugai, Eisai, Eli Lilly and NIPPON SHINYAKU. KE is affiliated with the department, which is supported by Taisho. KE has received research grants from Abbie, Asahi-Kasei, Astellas, Chugai, Eisai, Ono Pharmaceutical, and UCB Japan. K.E. has received payments for lectures from Abbie, Asahi-Kasei, Astellas, AYUMI, Bristol-Myers Squibb, Chugai, Eisai, Eli Lilly, Janssen, Mitsubishi Tanabe, Ono Pharmaceutical, Sanofi and UCB Japan. MH belong to the department that is financially supported by Nagahama City, Shiga, Japan, Toyooka City, Hyogo, Japan and five pharmaceutical companies (Mitsubishi-Tanabe, Chugai, UCB Japan, AYUMI and Asahi-Kasei). MH has received a research and/or speaker fee from Bristol-Meyers, Eisai, Ely Lilly, and Tanabe-Mitsubishi. JS reports personal fees from Mitsubishi Tanabe Pharma Corporation, personal fees from Chugai Pharmaceutical Co. Ltd, personal fees from Asahi-Kasei Corporation, personal fees from Eli Lilly and Company, personal fees from AbbVie GK. KM received a research grant from Eisai. AO received a speaker fee from Chugai, Ono Pharmaceutical, Eli Lilly, Mitsubishi Tanabe, Asahi-Kasei and Takeda. AK received a research grant and/or speaker fee from Mitsubishi-Tanabe, Chugai, Eisai, Asahi-Kasei, Astellas, Abbie, Bristol-Myers Squibb, Ono Pharmaceutical and Pfizer.
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Maeda, Y., Hirano, T., Ebina, K. et al. Comparison of efficacy between anti-IL-6 receptor antibody and other biological disease-modifying antirheumatic drugs in the patients with rheumatoid arthritis who have knee joint involvement: the ANSWER cohort, retrospective study. Rheumatol Int 41, 1233–1241 (2021). https://doi.org/10.1007/s00296-021-04862-y
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DOI: https://doi.org/10.1007/s00296-021-04862-y