Abstract
Neutropenia is a common adverse event of tocilizumab (TCZ) in rheumatoid arthritis (RA) patients; however, the association between the decrease in neutrophil counts and the TCZ clinical efficacy remains inconclusive. This study aimed to examine whether TCZ-induced neutrophil decrease at 1 month predicts clinical remission within 1 year. We reviewed medical records of RA patients initiating TCZ between May 2011 and September 2019 in our hospital. The Clinical Disease Activity Index (CDAI) was evaluated at baseline (before initiating TCZ) and 1, 3, 6, and 12 months after administration. Clinical remission was defined when CDAI decreased ≤ 2.8. The ratio of neutrophil counts 1 month after initiating TCZ to those at baseline (neutrophil ratio) was also calculated. Among 255 TCZ-treated patients, 169 with valid CDAI and neutrophil counts were enrolled (with median age of 60 years and 79% females). Rheumatoid factor and anti-cyclic citrullinated peptide antibody were positive in 75% and 83%, respectively, and 56% of the patients had concomitant methotrexate (median dose: 8 mg/week). Multivariate logistic regression analysis suggested baseline CDAI (odds ratio (OR) 0.96, p = 0.045), concomitant PSL (OR 0.42, p = 0.030), and the neutrophil ratio (OR 0.19, p = 0.011) as predictors of CDAI remission. Neutrophil ratio ≤ 0.8 was associated with achieving remission (Fisher's exact test, p = 0.02) with no apparent increase of severe infection. More than 20% reduction of neutrophil count 1 month after initiating TCZ predicts clinical remission within 1 year at an early treatment phase.
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The data sets used and analyzed during the current study are available from the corresponding author upon reasonable request.
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Acknowledgements
We would like to thank all patients enrolled in the study, Masanobu Ishio for extracting the cohort data, and Enago (www.enago.jp) for the language review.
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This work was in part supported by JSPS KAKENHI Grant Number 20K17418 to RW.
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TN, RW and MH conceived and designed the study. All authors were involved in patient recruitment and data collection. SM and AM supervised the study. TN conducted the statistical analysis and wrote the first draft of the manuscript. RW revised and finalized the manuscript. All authors read and approved the final manuscript.
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The Department of Advanced Medicine for Rheumatic Diseases is supported by Nagahama City, Shiga, Japan, Toyooka City, Hyogo, Japan and five pharmaceutical companies (Mitsubishi Tanabe Pharma Co., Chugai Pharmaceutical Co. Ltd, UCB Japan Co. Ltd, AYUMI Pharmaceutical Co., and Asahi Kasei Pharma Corp.). The KURAMA cohort is also supported by grant from Daiichi Sankyo Co. Ltd. The above-mentioned pharmaceutical companies were not involved in the study design, data collection and analysis, manuscript writing, and manuscript submission. RW received speaker fees from Mitsubishi Tanabe Pharma, Pfizer, Sanofi, AbbVie, Asahi Kasei, Eisai, Eli Lilly, Bristol-Myers Squibb, and Janssen. MH received a research grant and/or speaker fees from Bristol-Myers, Eisai, Ely Lilly, Mitsubishi Tanabe Pharma, Novartis Pharma. KMurat received a speaking fee from Eisai Co., Ltd. and Astellas Pharma Inc. KMurak has received speaking fees from Eisai Co. Ltd, Chugai Pharmaceutical Co. Ltd., Pfizer Inc., Bristol-Myers Squibb, Mitsubishi Tanabe Pharma Corporation, UCB Japan Co. Ltd, Daiichi Sankyo Co. Ltd. and Astellas Pharma Inc.. MT received research grants and/or speaker fees from AbbVie GK, Asahi Kasei Pharma Corporation, Astellas Pharma Inc., Bristol-Myers Squibb, Chugai Pharmaceutical Co., Ltd., Eisai Co., Ltd., Eli Lilly Japan K.K., Pfizer Inc., UCB Japan Co., Ltd., Janssen Pharmaceutical K.K., Mitsubishi Tanabe Pharma Corporation, Novartis Pharma K.K., Daiichi Sankyo Co. Ltd., Celgene Corp., Takeda Pharmaceutical Company Ltd., and Taisho Pharma Co., Ltd.. HI has received a research grant from Bristol-Myers Squibb, Asahi Kasei Pharma Corporation, Eisai, Mochida and Taisho. KK received research grants from GSK. RN has received research grants from Takeda and Medical & Biological Laboratories Co., Ltd. and speaking fees from Bristol-Myers Squibb, Astellas Pharma, Boehringer Ingelheim, Actelion Pharmaceuticals and Mitsubishi Tanabe Pharma, outside the submitted work. HY received lecture fees from Chugai and has been on the advisory board for a clinical trial conducted by Janssen. KO received research grants and/or speaker fees from AbbVie, Actelion Pharmaceuticals, Asahi Kasei Pharma, Astellas Pharma, Ayumi Pharmaceutical, Boehringer Ingelheim, Bristol-Myers Squibb, Chugai Pharmaceutical, Daiichi Sankyo, Eisai, Eli Lilly, GSK, JB, Janssen Pharmaceutical, Mitsubishi Tanabe Pharma, Nippon Kayaku, Nippon Shinyaku, Mitsubishi Tanabe Pharma, Novartis Pharma, Sanofi, Takeda Pharmaceutical. SM has received a research grant and/or speaker fee from Kyocera Medical Co., Mitsubishi Tanabe Pharma Co., Chugai Pharmaceutical Co. Ltd, Eisai Co., Ltd., Pfizer, Eli Lilly, Taisho Pharma Co., Ltd., and Ono Pharmaceutical Co.. AM has received research grants from AbbVie, Asahi Kasei Pharma, Chugai Pharmaceutical, Ono Pharmaceutical and speaking fees from Eli Lilly, AbbVie, Ono Pharmaceutical, Pfizer, Astellas Pharmaceutical, Chugai Pharmaceutical. All other authors have declared no conflicts of interest.
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The study protocol was approved by the Ethics Committee of Kyoto University Graduate School and Faculty of Medicine (No. R0357).
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Nakajima, T., Watanabe, R., Hashimoto, M. et al. Neutrophil count reduction 1 month after initiating tocilizumab can predict clinical remission within 1 year in rheumatoid arthritis patients. Rheumatol Int 42, 1983–1991 (2022). https://doi.org/10.1007/s00296-021-04944-x
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DOI: https://doi.org/10.1007/s00296-021-04944-x