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Learn more at HopkinsScleroderma.org.

The first thing to remember is that everybody with a diagnosis of scleroderma is at risk of developing lung disease — either interstitial lung disease (ILD), which affects about 60 percent of patients, or pulmonary vascular disease, which can lead to pulmonary hypertension (PH) in as many as 10-15 percent of patients. The true prevalence of PH is likely even higher; the definition has been changed from 25mmg to 20mmHg on right heart catheterization (RHC).

And the true prevalence of clinically important pulmonary vascular disease is understudied; with early detection, we are discovering that early changes often transition to life-threatening PH.

Can biomarkers predict the course of scleroderma lung disease?

Yes. The main antibody associated with ILD is anti-topoisomerase-1 (anti-topo-1).

Other antibodies:

• Anti-U3 RNP (anti-fibrillin), associated with ILD and PH.
• Anti-Th/To, associated with patients who have limited skin disease but an increased risk of lung disease.
• Anti-U11/U12 RNP antibodies, associated with ILD.

Other biomarkers that can help predict progression of ILD:

• KL-6, a glycoprotein, used in Europe and Japan
• SP-D, surfactant protein D, used in research
• Interferon gene signature, used in research
• CXCL8 and CXCL4, chemokine ligands, used in the research arena

What about bronchoalveolar lavage (BAL)?

Although there is evidence of an increase of neutrophils in the wash of active.

ILD, BAL has fallen by the wayside in scleroderma lung disease. We don’t do it anymore to define ILD activity.

What is the best protocol to detect ILD and emerging pulmonary vascular disease or PH?

Neither the patient nor the doctor will pick up early disease! Patients will be asymptomatic even though they may have active lung disease, and the doctor may not hear it with the stethoscope. We want to pick up disease early, because early intervention allows potential for reversing activity. Once the lung gets fibrotic, we move into a realm of irreversible disease.

Every patient with scleroderma should be looked at with a lung function test and high-resolution CT scan (HRCT).

HRCT is likely to be more sensitive than a lung function test. The presence of interstitial changes, particularly fibrosis, on HRCT predicts progression. Two things you will see on HRCT in scleroderma-related lung disease: “ground glass” changes – like you’re looking through a glass that’s hazy. That is early inflammation that is potentially reversible. These changes transition into thickened white streaks, which are fibrosis and less likely to be reversible.

Lung Function Test: A sensitive and important measure to follow is forced vital capacity (FVC). If FVC is normal and the HRCT scan is normal, this is extraordinarily reassuring, and predicts that the patient does not have active disease. In newly diagnosed patients, we recommend doing a repeat FVC study in 6 months, and if it’s still negative, and there are no symptoms, moving to yearly surveillance.

Most of the lung disease in scleroderma occurs in the early phase of the disease.

After five years of follow-up, it is far less likely that lung disease will occur. Some patients have late-onset lung disease, but the great majority who develop lung disease will do so in the first three years of disease. That’s the time frame for doing regular lung screening, particularly in patients at higher risk. The FVC is the best measure to follow patients sequentially. If a patient is losing 10 percent or greater of predicted FVC, that would be a sign of activity.

Early detection is the key.

If these tests are normal, we usually do the echo once yearly. So every patient should get a lung function test every 6—12 months, and an echo once a year. And in individuals who have a disproportionate drop in DLCO or a gradual increase in the ECHO estimated right ventricular systolic pressure, worry about emerging PH. An exercise ECHO is being tested at Hopkins to help screen patients for early PH. Right heart catheterization is necessary to fully define if PH is present, and if it is due to pulmonary arterial hypertension or left heart disease.

What is the current approach to managing ILD?

The initial approach is immunosuppressive therapy. Previously, cyclophosphamide had been shown in a clinical trial to benefit patients with evidence of ILD. But overall, it was disappointing; the effect was not necessarily long-lasting, and there were potential side effects. In a second trial, mycophenolate mofetil was shown to have an equivalent benefit to cyclophosphamide, with fewer side effects. But it wasn’t universally successful; some patients would continue to progress. Rituximab, an agent that targets activated B cells, also has proven to be beneficial in cases failing mycophenolate.

There are new drugs that don’t directly suppress the immune system, but affect the process of fibrosis. These agents are approved for another fibrotic lung disease, idiopathic pulmonary fibrosis. One is a tyrosine kinase inhibitor (nintedanib), the other is pirfenidone. A recent study published in the NEJM showed that nintedanib slowed the loss of lung volume compared to placebo: patients were treated either with the active drug or placebo; but both groups were allowed to use mycophenolate. The group who got the drug lost less lung volume compared to the placebo group; those who had mycophenolate plus nintedanib did even better with the combined immunosuppressive therapy and antifibrotic agent. The usefulness of nintedanib needs to be defined with further studies, but it is one of the first anti-fibrotic agents to show progress in scleroderma-related ILD. Pirfenidone is on the market for idiopathic pulmonary fibrosis, and has not yet been approved by the FDA for scleroderma. So, immunosuppression seems to work for some, but not all, patients, and the new wave is to use combination therapy.

What about lung transplant for patients with advanced scleroderma lung disease?

In general, if patients do not have other serious disease, they do just as well with lung transplant as other patients who have similar disease, like pulmonary hypertension for other reasons, or idiopathic pulmonary fibrosis. Many transplant centers accept scleroderma patients, and they put in a gastric tube to prevent reflux; the tube is temporary through the surgery and recovery phase. Patients are now getting a bilateral lung transplant. The mean survival after lung transplant is around five years, but we have some patients out 10 to 15 years after transplant, who are still doing well.

Further Reading

Nintedanib for systemic sclerosis-associated interstitial lung disease.
New England Journal of Medicine
2019, PMID: 31112379

Short-term progression of interstitial lung disease in systemic sclerosis predicts long-term survival in two independent clinical trial cohorts.
Annals of the Rheumatic Diseases
2019, PMID: 30409830

Autoantibodies and scleroderma phenotype define subgroups at high- risk and low-risk for cancer.
Annals of the Rheumatic Diseases
2018, PMID: 29678941

Raynaud's Phenomenon.
New England Journal of Medicine
2016, PMID: 27509103

#1 Killer

Lung disease is the #1 killer of patients with scleroderma.

At highest risk for interstitial lung disease are individuals who:

• are African American or Native American
• are in the early phases of disease
• manifest rapid, diffuse skin changes rather than limited, mild skin changes