Key clinical point: Concomitant methotrexate significantly reduced humoral response to the third SARS-CoV-2 mRNA vaccine in older (age ≥ 64.5 years) but not younger (age < 64.5 years) patients with rheumatoid arthritis (RA).
Major finding: Patients aged ≥ 64.5 years receiving methotrexate plus biologic or targeted synthetic disease-modifying antirheumatic drugs (b/tsDMARD) vs methotrexate monotherapy or b/tsDMARD monotherapy had significantly lower serum levels of immunoglobulin G antibody for SARS-CoV-2 spike protein receptor binding domain (64.8 vs 1743.8 or 1106.0 binding antibody units/mL, respectively; Kruskal-Wallis Test, P < .001), whereas patients aged < 64.5 years showed no significant difference (Kruskal-Wallis Test, P = .334).
Study details: Findings are from a retrospective analysis including 136 patients with RA treated with conventional synthetic DMARD or b/ts DMARD with or without methotrexate who received the third dose of SARS-CoV-2 mRNA vaccines BNT162b2 (Pfizer/BioNTech) or mRNA-1273 (Moderna).
Disclosures: This study did not declare any specific source of funding. No conflict of interests was declared.
Source: Stahl D et al. Reduced humoral response to a third dose (booster) of SARS-CoV-2 mRNA vaccines by concomitant methotrexate therapy in elderly patients with rheumatoid arthritis. RMD Open . 2022;8(2):e002632 (Oct 10). Doi: 10.1136/rmdopen-2022-002632