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The adoption of nintedanib in systemic sclerosis: the SENSCIS study

Teresa Bruni, Francesco Varone
Breathe 2020 16: 200005; DOI: 10.1183/20734735.0005-2020
Teresa Bruni
1Malattie dell'apparato Respiratorio, Università Cattolica del Sacro Cuore Sede di Roma, Rome, Italy
2Respiratory Medicine, Policlinico Universitario Agostino Gemelli, Rome, Italy
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  • For correspondence: teresbruni@gmail.com
Francesco Varone
2Respiratory Medicine, Policlinico Universitario Agostino Gemelli, Rome, Italy
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Abstract

Nintedanib shows a statistically significant effect on lung function decay in patients with ILD secondary to systemic sclerosis, but no effect on skin fibrosis and on health-related quality of life http://bit.ly/2vfJRj7

Commentary on:

Distler O, et al. Nintedanib for systemic sclerosis-associated interstitial lung disease. N Engl J Med 2019; 380: 2518–2528.

Context

We live in an era of respiratory medicine in which there is increasing awareness of interstitial lung diseases (ILDs). This is probably due to the publication of evidence-based guidelines [1, 2] and the discovery of newer drugs [3, 4]. These advances are particularly evident for idiopathic pulmonary fibrosis (IPF), which is to date the only fibrotic disease with specific pharmacologic-approved treatments. The burgeoning interest in pulmonary fibrosis has recently shifted its focus to the possibility of using therapeutic interventions available for IPF on other non-IPF ILDs, including pulmonary fibrosis secondary to systemic sclerosis (SSc). ILD represents one of the most relevant complications of SSc [5], but a standard treatment has yet to be achieved. Currently, the therapeutic management of SSc-ILD includes a “wait and see” approach in patients with a slow functional decay, and an immunosuppressive strategy (cyclophosphamide or mycophenolate) in patients with progressive ILD [6]. The Safety and Efficacy of Nintedanib in Systemic Sclerosis (SENSCIS) trial[7] explored the use of nintedanib, an intracellular inhibitor of tyrosine kinases currently approved for IPF, in scleroderma patients.

Methods

The SENSCIS study was a 52-week randomised double-blind trial recruiting 580 patients with a diagnosis of SSc, according to the most recent American College of Rheumatology/European League Against Rheumatism (ACR/EULAR) criteria[5], with a secondary ILD recognised through a high-resolution computed tomography (HRCT) scan, involving at least 10% of the lungs. Forced vital capacity (FVC) and diffusing capacity for carbon monoxide (DLCO) were required to be more than 40% and between 30% and 89% of their respective predicted values. Significant pulmonary hypertension (PH) was one of the key exclusion criteria.

After 1:1 ratio randomisation, patients were assigned to nintedanib 150 mg twice daily or placebo. Background treatment with up to 10 mg·day−1 of prednisone, or with a 6-month stable dose of mycophenolate (MMF) or methotrexate was also permitted.

The primary end point of the study was the annual rate of decline in FVC. Key secondary end points were absolute change from baseline in modified Rodnan skin score (mRSS) and St. George's Respiratory Questionnaire (SGRQ) at week 52. Other secondary endpoints were the percentage change of FVC and DLCO and the absolute change in digital ulcer burden from baseline values.

Main results

Patients included in the trial had a mean age of 54.0±12.2 years; women were 76.7% and 73.6% of patients in nintedanib and placebo groups, respectively. The mean FVC and DLCO were respectively 72.5±16.7% and 53.0±15.1% of their predicted values. Almost half of the patients in both nintedanib and placebo arms were background medications naive, while the remaining 50% were in treatment with MMF. The analysis was conducted in 576 patients who received at least one dose of nintedanib or placebo.

According to the primary analysis, the nintedanib group showed a lower annual rate of decline in FVC (−52.4±13.8 mL·year−1) than the placebo group (−93.3±13.5 mL·year−1). The difference was 41.0 mL per year (95% confidence interval 2.9–79.0; p=0.04), with a relative rate of reduction in FVC of 44% [fig. 1]. Moreover, in the nintedanib arm, patients who were taking mycophenolate at baseline presented a minor rate of change in FVC (−40.2 mL) than naive patients (−63.9 mL).

Figure 1
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Figure 1

Annual rate of decline in FVC: Nintedanib versus placebo.

No significant absolute change from baseline was observed for mRSS and SGRQ.

Both arms presented an analogous rate of mortality and a comparable number of severe adverse events. The safety and tolerability profile of nintedanib in scleroderma patients was similar to that of patients with IPF. Gastrointestinal (GI) adverse events were more common in SSc patients (regardless the arm of the study) than in IPF, probably due to the known GI involvement of scleroderma. Diarrhoea, vomiting and elevation in liver enzymes were the main adverse events reported in the nintedanib group. The percentage of patients who discontinued the assigned intervention because of adverse events was 16% in the nintedanib arm and 8.7% in the placebo arm.

Commentary

SSc-ILD is mainly characterised by the nonspecific interstitial pneumonia radiological and/or histological pattern [5]; only a minority of patients with scleroderma may exhibit the usual interstitial pneumonia (UIP) pattern, which is typical of IPF. Nevertheless, since similarities have been demonstrated in some phases of the pathogenetic cascade between IPF and SSc-ILD (such as epithelial and/or endothelial cell injury and platelet-derived growth factor receptor overexpression [8]), it was hypothesised that nintedanib could show benefit also in patients with SSc-ILD.

Nintedanib is a multi-target tyrosine kinase inhibitor, approved for use in IPF by the U.S. Food and Drug Administration (FDA) in 2014 and by the European Medicines Agency (EMA) in 2015. The two INPULSIS studies clearly showed efficacy of this drug in slowing the rate of functional decline [3]. The most commonly reported adverse events from patients treated with nintedanib are diarrhoea, hepatic enzyme elevation and increased risk of bleeding [9]. The efficacy and safety profile of nintedanib described in patients with IPF also prompted the SENSCIS study design.

The design of SENSCIS and INPULSIS studies was very similar. The main endpoint of SENSCIS, namely the annual rate of decline in FVC measured in millilitres per year, was the same of INPULSIS, while in the most important SSc-ILD trials [10,11] the change in the percentage value of FVC compared to baseline was the primary outcome. Other key secondary endpoints were the absolute change from baseline of mRSS and SGRQ score. The mRSS, a feasible score of skin thickness which generally reflects an associated internal organ involvement and increased mortality risk [12], is also an almost universally used endpoint in SSc clinical trials [13]. The SGRQ is a tool designed to assess the health-related quality of life in patients with chronic respiratory diseases, which correlates with the perceived breathlessness, exertional capacity and HRCT abnormalities also in patients with ­SSc-ILD [14].

The SENSCIS trial was a positive study, due to the statistically significant effect of nintedanib on lung function decay. Moreover, even if patients where not randomised to MMF use, the combination of nintedanib and mycophenolate has shown the lowest decline in pulmonary function.

Nonetheless, important elucidation on its results are necessary. The first comment regards the difference between the populations studied. Inthe SENSCIS trial, patients were younger and mostly women, while in INPULSIS, the patients were older and largely men.

The second comment regards the rate of progression of SSc-ILD as compared to IPF. In the INPULSIS trials, the nintedanib and placebo arms showed an annual rate of decline in FVC of −113.6 mL·year−1 and −223.5 mL·years−1, respectively [fig. 2]. In the SENSCIS study, the same measurement in nintedanib and placebo arms was of −52.4 mL·year−1 and −93.3 mL·year−1, respectively. Even if the relative rate of reduction in FVC compared to placebo was similar (49% versus 44% in INPULSIS and SENSCIS, respectively), the difference in the annual rate of decline in FVC in the placebo arms between the two trials was 130.2 mL·years−1. In other words, the rate of decline of the placebo arm from SENSCIS was lower than the nintedanib arm from the INPULSIS. This implies that the two populations studied are markedly different and no convincing comparison between them could be done.

Figure 2
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Figure 2

Annual rate of decline in FVC: SENSCIS versus INPULSIS.

Moreover, nintedanib revealed no effect on skin fibrosis and on health-related quality of life, evaluated through the mRSS and the SGRQ, respectively. These results highlight how nintedanib does not seem to play any role on the multiorgan involvement of SSc. Furthermore, the quality of life of SSc patients might be compromised by the presence of the side effects of the drug, despite a reduced deterioration of lung function.

The SENSCIS trial showed the best efficacy in patients taking both nintedanib and MMF, with no described increase in side effects. This result could pave the way to newer studies exploring the efficacy of the combination of the two drugs in SSc and other connective tissue disease-associated ILDs, such as rheumatoid arthritis-associated ILD, that are currently lacking well-designed clinical research. Combination therapy has been advocated by experts as an option for future management of IPF [15] and has already been explored in phase 2 [16], phase3[17, 18] and phase 4 studies [19].

Implications for practice

Currently, ILD and PH are the main causes of death in patients with SSc. To date, the management of SSc-ILD has been based on the use of immunosuppressants. In September 2019, after the SENSCIS study, nintedanib was approved by FDA for the treatment of SSc- ILD in the USA, while in Europe the approval by EMA is still pending. An open-label extension of SENSCIS study to evaluate the long-term effectiveness of nintedanib in patients with SSc-ILD is currently ongoing. Furthermore, the results of the INBUILD trial [20] showed outstanding results for the use of nintedanib in progressive fibrosing ILDs, including pulmonary fibrosis secondary to scleroderma. The positive results of the SENSCIS trial on lung function could pave the way for a newer therapeutic approach to these patients, including combination or sequential regimens.

Nowadays SSc-ILD is managed primarily by rheumatologists in many institutions, but, since nintedanib is a drug already prescribed for patients with IPF, pulmonologists are already familiar with its handling.

The use of nintedanib for SSc-ILD patients will desirably imply a partnership between pulmonologists - who better know the drug- and rheumatologists – who better know the disease. As for IPF, multidisciplinarity and cooperation among different specialities might better improvethe overall management of these fragile
patients.

Footnotes

  • Conflict of interest: T. Bruni has nothing to disclose.

  • Conflict of interest: F. Varone reports personal fees from Boehringer Ingelheim and Roche outside the submitted work.

  • Received January 13, 2020.
  • Accepted January 29, 2020.
  • Copyright ©ERS 2020
http://creativecommons.org/licenses/by-nc/4.0/

Breathe articles are open access and distributed under the terms of the Creative Commons Attribution Non-Commercial Licence 4.0.

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The adoption of nintedanib in systemic sclerosis: the SENSCIS study
Teresa Bruni, Francesco Varone
Breathe Jun 2020, 16 (2) 200005; DOI: 10.1183/20734735.0005-2020

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Teresa Bruni, Francesco Varone
Breathe Jun 2020, 16 (2) 200005; DOI: 10.1183/20734735.0005-2020
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