Association Between Immunosuppressive Therapy and Incident Risk of Interstitial Lung Disease in Systemic Sclerosis

Flemish network on rare connective tissue diseases (CTD): patient pathways in systemic sclerosis. First steps taken

Despite the low prevalence of each rare disease, the total burden is high. Patients with rare diseases encounter numerous barriers, including delayed diagnosis and limited access to high-quality treatments. In order to tackle these challenges, the European Commission launched the European Reference Networks (ERNs), cross-border networks of healthcare providers and patients representatives. In parallel, the aims and structure of these ERNs were translated at the federal and regional levels, resulting in the creation of the Flemish Network of Rare Diseases. In line with the mission of the ERNs and to ensure equal access to care, we describe as first patient pathways for systemic sclerosis (SSc), as a pilot model for other rare connective and musculoskeletal diseases. Consensus was reached on following key messages: 1. Patients with SSc should have multidisciplinary clinical and investigational evaluations in a tertiary reference expert centre at baseline, and subsequently every three to 5 years. Intermediately, a yearly clinical evaluation should be provided in the reference centre, whilst SSc technical evaluations are permissionably executed in a centre that follows SSc-specific clinical practice guidelines. In between, monitoring can take place in secondary care units, under the condition that qualitative examinations and care including interactive multidisciplinary consultations can be provided. 2. Patients with early diffuse cutaneous SSc, (progressive) interstitial lung disease and/or pulmonary arterial hypertension should undergo regular evaluations in specialised tertiary care reference institutions. 3. Monitoring of patients with progressive interstitial lung disease and/or pulmonary (arterial) hypertension will be done in agreement with experts of ERN LUNG.

Systemic sclerosis interstitial lung disease: unmet needs and potential solutions

Systemic sclerosis (SSc), or scleroderma, is a rare, complex, systemic autoimmune disease of unknown aetiology, characterized by high morbidity and mortality often resulting from cardiopulmonary complications such as interstitial lung disease and pulmonary arterial hypertension. Despite substantial progress in unravelling the pathways involved in the pathogenesis of SSc and the increasing number of therapeutic targets tested in clinical trials, there is still no cure for this disease, although several proposed treatments might limit the involvement of specific organs, thereby slowing the natural history of the disease. A specific focus of recent research has been to address the plethora of unmet needs regarding the global management of SSc-related interstitial lung disease, including its pathogenesis, early diagnosis, risk stratification of patients, appropriate treatment regimens and monitoring of treatment response, as well as the definition of progression and predictors of progression and mortality. More refined stratification of patients on the basis of clinical features, molecular signatures, identification of subpopulations with distinct clinical trajectories and implementation of outcome measures for future clinical trials could also improve therapeutic management strategies, helping to avoid poor outcomes related to lung involvement.

State-of-the-art evidence in the treatment of systemic sclerosis

Systemic sclerosis (SSc) is a rare autoimmune connective tissue disease with multi-organ involvement, fibrosis and vasculopathy. Treatment in SSc, including early diffuse cutaneous SSc (dcSSc) and the use of organ-specific therapies, has improved, as evident from randomized clinical trials. Treatments for early dcSSc include immunosuppressive agents such as mycophenolate mofetil, methotrexate, cyclophosphamide, rituximab and tocilizumab. Patients with rapidly progressive early dcSSc might be eligible for autologous haematopoietic stem cell transplantation, which can improve survival. Morbidity from interstitial lung disease and pulmonary arterial hypertension is improving with the use of proven therapies. Mycophenolate mofetil has surpassed cyclophosphamide as the initial treatment for SSc-interstitial lung disease. Nintedanib and possibly perfinidone can be considered in SSc pulmonary fibrosis. Pulmonary arterial hypertension is frequently treated with initial combination therapy (for example, with phosphodiesterase 5 inhibitors and endothelin receptor antagonists) and, if necessary, the addition of a prostacyclin analogue. Raynaud phenomenon and digital ulcers are treated with dihydropyridine calcium channel blockers (especially nifedipine), then phosphodiesterase 5 inhibitors or intravenous iloprost. Bosentan can reduce the development of new digital ulcers. Trial data for other manifestations are mostly lacking. Research is needed to develop targeted and highly effective treatments, best practices for organ-specific screening and early intervention, and sensitive outcome measurements.

Screening and management of subclinical interstitial lung disease in systemic sclerosis: an international survey

OBJECTIVE

Interstitial lung disease (ILD) is the leading cause of mortality in systemic sclerosis (SSc). Experts now recommend HRCT screening in all SSc patients and treatment of subclinical ILD in SSc patients with high-risk phenotypes. We undertook an international survey to understand current screening and treatment practices in subclinical SSc-ILD.

METHODS

An electronic REDCap survey was distributed to 611 general rheumatologists, 348 national and international SSc experts, 285 general respirologists and 57 ILD experts.

RESULTS

198 participants responded to the survey, including 135 (68%) rheumatologists and 54 (27%) respirologists. Over half (59%) of respondents routinely ordered HRCTs in all newly diagnosed SSc patients, although this practice was more common in Europe (83%), the United States (68%), Asia (73%) and Latin America (100%) compared to Canada (40%) and Australia (40%). Nearly half (48%) of respondents would not treat subclinical SSc-ILD, whereas 52% would treat or consider treatment. At least 70% would likely treat subclinical ILD in the setting of diffuse SSc, anti-topoisomerase-I autoantibodies, disease duration below 18 months, ground-glass opacities, oxygen desaturation, or significant ILD progression on imaging or pulmonary function tests. The majority (67%) of respirologists would not treat subclinical ILD. Mycophenolate mofetil was the preferred first-line drug for the treatment of subclinical SSc-ILD.

CONCLUSION

This international survey highlights important regional variations in SSc-ILD screening and significant heterogeneity among rheumatologists and respirologists in the treatment of subclinical SSc-ILD. High-quality research addressing these questions is needed to produce evidence-based guidelines and harmonize the approach to identification and treatment of subclinical SSc-ILD.