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Appendix 4 – Inflammatory Musculoskeletal Pain TRG Literature Review Summaries, Clinical Rationales, and Evidence Summaries with References Materials reviewed by the Consensus Expert Panel Literature Review Literature searches for DMARDs were conducted in 4 different phases due to the large number of DMARDS reviewed (Supplementary material – Figure 4). Starting in June 2012, 182 titles were identified for Search #1; 24 articles for Search #2; 294 articles for Search #3; and 532 articles for Search #4. An updated literature search on March 28, 2014 resulted in 18 additional articles for consideration, and a subsequent search on May 27, 2014 resulted in another 10 articles. In all, 1,060 abstracts were reviewed. Twelve articles were selected as meeting the TRG's pre-selected criteria for further study (29, 49-50, 56, 58, 77-83); two additional articles that included no therapeutic interventions (84-85) and seven systematic reviews were also considered (85-91). These latter articles contributed to the TRG's overall information and subsequent discussion for management and treatment of inflammatory musculoskeletal pain in Sjögren’s but were not considered as part of the evidence. Of the twelve publications that met TRG criteria, one covered more than one therapy (78). The TRG considered six studies on hydroxychloroquine (49, 56, 77-79, 92), three on methotrexate (78, 80, 93), two on leflunomide (58, 93), and one on azathioprine (50). Clinical Rationale Many patients with connective tissue disease, including individuals with primary Sjögren’s, can suffer from inflammatory joint and muscle pain. Manifestations range from arthralgias and myalgias to frank synovitis. Musculoskeletal pain may impact a patient’s ability to work and/or perform normal activities of daily living and, therefore, contributes to overall disease-related disability. Evaluation and management of this problem are further complicated by the presence of multiple Sjögren’s-related co-morbidities that may also cause pain including but not limited to: fibromyalgia, vitamin D deficiency and hypothyroidism. In addition, coincidental age-related osteoarthritis is common in the middle-aged and older adult Sjögren’s population and further contributes to pain. Nonsteroidal anti-inflammatory drugs (NSAIDs) are often utilized as 1st line therapy for mild pain and/or arthritis but frequently provide incomplete relief and cause multiple side effects including but not limited to dyspepsia, ulcers, reflux and renal compromise. Disease modifying antirheumatic drugs (DMARDs), which have proven useful in the management of rheumatoid arthritis and systemic lupus erythematosus, are commonly used to treat inflammatory musculoskeletal pain in Sjögren’s. To date, there is no universal agreement on the medication of choice. Occasionally, these treatments may also cause life-altering or life-threatening side effects including but not limited to: retinal toxicity, cytopenias and infections. Therapeutic benefit can only be assessed after consideration of other patient medical problems, severity of pain and the impact of musculoskeletal pain on physical function and quality of life. Therefore, guidance regarding the efficacy and safety of DMARD treatment for musculoskeletal pain in Sjögren’s is needed to help physicians devise a rational treatment algorithm in order to optimize the benefit/risk ratio at every level of therapy. Evidence Summary Evidence Summary: Hydroxychloroquine for Inflammatory Musculoskeletal Pain in Sjögren’s The TRG found more studies (seven) for use of hydroxychloroquine in Sjögren’s than for any other treatment; six met its pre-selected criteria (49,56,77-79, 92). All but one (77) demonstrated benefit of HCQ at least at some level. Fauchais et al (78) concluded that 75% of Sjögren’s patients showed symptomatic improvement with HCQ. This study involved a large sample size with excellent follow-up and measured joint pain, tenderness and swelling as primary outcomes; however, no controls or placebo were used, and methods of assessment were not detailed. In a second study with large enrollment but no controls or placebo (R Fox et al 1996) (57), HCQ significantly improved stiffness, myalgias, arthralgias, joint swelling, ESR and IgG in most patients. An earlier study by R Fox et al in 1988 (79) also showed significant improvement in IgG, IgA, IgA, RF, anti-SSB, ESR, and Hgb over 12 months compared to untreated controls. Mumcu et al (2013) (92) found higher serum and salivary BAFF levels in Sjögren’s patients compared to controls, and that patient levels of BAFF were significantly lowered with HCQ treatment at both 12 and 24 weeks compared to pre-treatment baseline. Two studies reported little to no benefit: One of these studies, by Kruize et al (1993) (50) found no clinical improvement but noted decreases in levels of IgG and IgM and a slight decrease in ESR. In a randomized, controlled, trial Gottenberg et al (2014) (77) found no significant difference in the proportion of patients (HCQ n=52, placebo n=53) with reduction in pain, fatigue or dryness at the primary end point of 24 weeks (HCQ 17.2% vs. placebo 17.9%). When all patients were treated with HCQ from 24-48 weeks some separation between the two groups was noted (HCQ 30.4% vs. placebo/HCQ 18.8%) (p= 0.21). Evidence: Methotrexate The strongest study on the use of methotrexate (MTX) for inflammatory musculoskeletal pain in Sjögren’s by Fauchais et al (2010) (78) was uncontrolled but demonstrated a good clinical response. Articular manifestations improved in 11 out of 12 Sjögren’s patients on MTX compared to pre-treatment baseline. For the remaining two studies, one (Skopouli FN et al) (80) found a decrease in the frequency of arthralgias in 80% (8/10) of Sjögren’s patients with inflammatory musculoskeletal pain at 6 months and 40% (4/10) at 12 months. A second observational case study (Khan and Carsons) (93) that described six primary Sjögren’s patients whose course was complicated by the development of nonerosive rheumatoid arthritis, reported benefit from the use of DMARDs (MTX or leflunomide) with or without biological therapy. Evidence: Leflunomide Two studies were found using leflunomide for inflammatory musculoskeletal pain in Sjögren’s that met pre-determined criteria for consideration. The first, van Woerkom et al (2007) (58) was an open-label phase 2 pilot study that showed modest efficacy in primary Sjögren’s patients. The study demonstrated improvement in lip biopsy focuses scores, fatigue, physical functioning, IgG levels and leukocytoclastic vasculitis, but had no MSK endpoint. The safety profile was considered acceptable. The second study, Khan and Carsons (93), was an observational study of six primary Sjögren’s patients with aggressive arthritis and subsequent diagnosis of RA that required the use of DMARDs (MTX or leflunomide) with or without biological therapy. Both studies noted that the primary adverse symptoms with use of leflunomide were diarrhea and gastrointestinal discomfort. References for Supplementary Materials – All Literature Review, Clinical Rationale, and Evidence Summaries 14. Dass S, Bowman SJ, Vital EM, Ikeda K, Pease CT, Hamburger J, Richards A, Rauz S, Emery P. Reduction of fatigue in Sjögren syndrome with rituximab: results of a randomised, double-blind, placebocontrolled pilot study. Ann Rheum Dis. 2008 Nov;67(11):1541-4. 15.Devauchelle-Pensec V, Pennec Y, Morvan J, Pers JO, Daridon C, Jousse-Joulin S, Roudaut A, Jamin C, Renaudineau Y, Roué IQ, Cochener B, Youinou P, Saraux A. 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