Advances in Clinical and Experimental Medicine

Adv Clin Exp Med
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ISSN 1899–5276 (print)
ISSN 2451-2680 (online)
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Advances in Clinical and Experimental Medicine

2019, vol. 28, nr 9, September, p. 1229–1235

doi: 10.17219/acem/105379

Publication type: original article

Language: English

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Creative Commons BY-NC-ND 3.0 Open Access

Effectiveness of subcutaneously administered methotrexate in patients with rheumatoid arthritis

Przemysław Kotyla1,C,D,F, Bogdan Batko2,E,F, Zbigniew Zuber3,E,F, Agnieszka Almgren-Rachtan4,B,C,F, Jerzy Chudek5,A,C,D,E,F, Eugeniusz Józef Kucharz1,C,F

1 Department of Internal Medicine, Rheumatology and Clinical Immunology, Medical Faculty in Katowice, Medical University of Silesia, Katowice, Poland

2 Department of Rheumatology, J. Dietl Specialist Hospital, Kraków, Poland

3 Department of Older Children with Subunits of Neurology and Rheumatology, St. Louis Regional Specialized Children’s Hospital, Kraków, Poland

4 Department of Pharmacovigilance, Europharma M. Rachtan Co. Ltd., Katowice, Poland

5 Department of Pathophysiology and Department of Internal Medicine and Oncological Chemotherapy, Medical University of Silesia, Katowice, Poland

Abstract

Background. Subcutaneous methotrexate (sMTX) administration is considered more effective than the oral route due to better bioavailability and a lower rate of adverse drug reactions (ADRs); however, clinical data supporting this hypothesis is scarce.
Objectives. The aim of the study was to evaluate the efficacy and tolerability of sMTX in patients with active rheumatoid arthritis (RA), including a subset classified as an early stage of RA.
Material and Methods. A post-marketing, multicenter, open-label, non-randomized, non-interventional study enrolled 771 adult patients with active RA treated with sMTX (Metex®) for 2–6 weeks. The evaluation of therapy effectiveness (DAS28-ESR or DAS28-CRP) and monitoring of ADRs was an element of routine patient management. Therapy effectiveness was scored as the achievement of remission or response (according to European League Against Rheumatism (EULAR)).
Results. Among 761 (98.7%) patients that continued sMTX (after 25–31 weeks), clinical response was achieved by 69.5%, remission by 19.2% and low disease activity by 34.2%. Patients aged >60 years were less likely to achieve both remission (odds ratio (OR) = 0.61 (95% confidence interval (95% CI) = 0.39–0.93)) and clinical response (OR = 0.82 (95% CI = 0.71–0.95)), while overweight/obese patients (OR = 1.11 (95% CI = 1.00–1.24)) and those with early RA had greater chance to reach a clinical response (OR = 1.18 (95% CI = 1.03–1.34)). There were 16 ADRs (no serious or severe). In addition, at least 2-fold increase in alanine transaminase (ALT) activity was noted in 10 patients (1.3%).
Conclusion. After 6-month therapy with sMTX, about 70% of patients with RA achieve a clinical response, and remission was observed in 20%. Younger age, overweight/obesity and an early stage of the disease are factors increasing therapy effectiveness; sMTX is well tolerated.

Key words

methotrexate, rheumatoid arthritis, tolerance, subcutaneous, response rate

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