Abstract
Progressive fibrosing interstitial lung diseases (ILDs) involve similar pathophysiological processes, indicating the potential for common approaches to treatment. Nintedanib (Ofev®), an intracellular tyrosine kinase inhibitor (TKI) with antifibrotic properties, was one of the first drugs approved for use in idiopathic pulmonary fibrosis (IPF) and has more recently been approved for use in other chronic fibrosing ILDs with a progressive phenotype and systemic sclerosis-associated ILD (SSc-ILD). In multinational phase III trials, nintedanib significantly reduced the annual rate of decline in forced vital capacity (FVC) in adults with IPF, other progressive fibrosing ILDs and SSc-ILD. Reductions in FVC decline with nintedanib in patients with IPF and severe gas exchange impairment were comparable to those in patients with milder disease. Real-world experience in patients with IPF supports the effectiveness of nintedanib in slowing ILD progression. Nintedanib had a manageable tolerability profile in patients with fibrotic ILDs in clinical trials and real-world studies. No new safety signals have emerged from global pharmacovigilance data. Nintedanib continues to represent an important therapeutic option in patients with IPF and is the first drug to be approved for use in patients with other chronic fibrosing ILDs with a progressive phenotype or SSc-ILD, with these approvals expanding the range of fibrotic ILDs for which nintedanib can be prescribed.
Plain language summary
Treatment options for fibrotic interstitial lung diseases (ILDs) that involve progressive lung function decline have historically been limited. Nintedanib (Ofev®) was one of the first antifibrotic drugs to be approved for use in idiopathic pulmonary fibrosis and is now also approved for use in other chronic fibrosing ILDs with a progressive phenotype and systemic sclerosis-associated ILD (SSc-ILD). Nintedanib reduced lung function deterioration in patients with idiopathic pulmonary fibrosis, other chronic fibrosing ILDs with a progressive phenotype and SSc-ILD in well-designed clinical trials. In patients with idiopathic pulmonary fibrosis, the clinical benefit of nintedanib was shown to persist over more than 4 years of treatment. The most common adverse events in nintedanib recipients were diarrhoea and nausea, which were manageable in the majority of patients. Real-world experience supports the effectiveness and acceptable safety of nintedanib. Nintedanib remains an important treatment option for patients with idiopathic pulmonary fibrosis and is the first drug to be approved for use in patients with other chronic fibrosing ILDs with a progressive phenotype and SSc-ILD.
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Digital Features for this Adis Drug Evaluation can be found at https://doi.org/10.6084/m9.figshare.13654466. |
Orally administered TKI with antifibrotic properties |
Reduces lung function deterioration in patients with IPF, other chronic fibrosing ILDs with a progressive phenotype and SSc-ILD |
Clinical benefit persists over long-term treatment |
Manageable tolerability profile; most common adverse events are gastrointestinal |
1 Introduction
Idiopathic pulmonary fibrosis (IPF) is a progressive fibrosing interstitial lung disease (ILD) and, as such, is characterized by self-sustaining fibrosis, deteriorating lung function, worsening symptoms (e.g. dyspnoea, cough), increasingly impaired health-related quality of life (HR-QOL) and premature mortality [1,2,3]; the median survival from the time of diagnosis is 4.5 years [4]. Other ILDs that may develop a progressive fibrosing phenotype include (among others) idiopathic non-specific interstitial pneumonia, unclassifiable idiopathic interstitial pneumonia, hypersensitivity pneumonitis, and autoimmune ILDs such as rheumatoid arthritis-associated ILD and systemic sclerosis-associated ILD (SSc-ILD) [1, 5, 6]. These progressive fibrosing ILDs can have similar clinical characteristics to IPF (although unlike IPF, they may be clinically stable, particularly in cases of milder disease) and appear to have genetic risk factors and pathophysiological mechanisms that overlap with those of IPF, suggesting the potential for common treatment approaches [1, 5, 6].
Early treatment of IPF is crucial for slowing lung function decline, reducing the risk of acute exacerbations and improving clinical outcomes [3]. Treatment options for IPF have historically been limited, however, and until recently there were no approved drugs for the treatment of non-IPF ILDs [2]. The fibroblast growth factor (FGF), platelet-derived growth factor (PDGF) and vascular endothelial growth factor (VEGF) receptor tyrosine kinases have proved to be valuable therapeutic targets in the treatment of IPF, with FGF, PDGF and VEGF mediating profibrotic processes and being implicated in IPF pathogenesis [7].
Nintedanib (Ofev®), an orally administered intracellular tyrosine kinase inhibitor (TKI) initially developed as an antitumor agent, has antifibrotic properties and was one of the first drugs (along with the antifibrotic pirfenidone) to be approved for the treatment of IPF in the EU and USA [8]; use of nintedanib in this indication has been previously reviewed in Drugs [7]. More recently, nintedanib has been approved in the same regions for use in other chronic fibrosing ILDs with a progressive phenotype and SSc-ILD (Sect. 4). This article discusses the therapeutic efficacy and safety/tolerability of nintedanib in the treatment of fibrotic ILDs. A brief overview of the pharmacological properties of nintedanib relevant to its use in fibrotic ILDs is presented in Table 1.
2 Therapeutic Efficacy of Nintedanib
2.1 In IPF
The efficacy of nintedanib in the treatment of patients with IPF was investigated in the randomized, double-blind, placebo-controlled, multinational, phase III INPULSIS-1 and INPULSIS-2 trials [9] and an open-label long-term extension (INPULSIS-ON) [10]. The dosage evaluated in the INPULSIS trials (nintedanib 150 mg twice daily) was established in an earlier phase II dose-finding trial (TOMORROW) [11]; given that phase III data are available, TOMORROW is not discussed further. Data from the INPULSIS trials are supported by those from the randomized, double-blind, multinational, phase III INSTAGE trial evaluating nintedanib plus sildenafil versus nintedanib alone in the treatment of patients with advanced IPF [12] and numerous real-world studies (e.g. [13,14,15,16,17,18,19,20]).
2.1.1 INPULSIS-1 and INPULSIS-2
The replicate INPULSIS-1 and INPULSIS-2 trials enrolled adults ≥ 40 years of age diagnosed with IPF within the previous 5 years [9]. Eligibility was confirmed by means of centrally reviewed high-resolution computed tomography (HRCT) of the chest (conducted within the previous 12 months) and, where available, lung biopsy specimens. Patients were required to have a forced vital capacity (FVC) ≥ 50% of the predicted value and a carbon monoxide diffusion capacity (DLCO; corrected for haemoglobin) 30–79% of the predicted value. Background therapy with prednisone ≤ 15 mg/day (or equivalent) was permitted if the dosage had been stable for ≥ 8 weeks prior to screening [9].
Patients received oral nintedanib 150 mg twice daily or matching placebo for 52 weeks [9]. Dose interruption or reduction to nintedanib 100 mg twice daily was permitted for the management of adverse events (AEs). In both trials, the primary endpoint was the annual rate of decline in FVC over 52 weeks. Baseline characteristics of patients were similar between treatment groups in each trial. At baseline, patients had a mean age ≈ 67 years, FVC ≈ 80% of the predicted value and DLCO ≈ 47% of the predicted value. In each trial, the mean exposure to the study drug was ≈ 45 weeks [9].
Nintedanib was effective in reducing FVC decline [9]. Annual rates of FVC decline were significantly lower in nintedanib recipients than placebo recipients in INPULSIS-1, INPULSIS-2 and a prespecified pooled analysis (Table 2). Nintedanib also significantly reduced the adjusted absolute mean change from baseline in FVC in mL and as a percentage of the predicted value (p < 0.001 vs placebo in each trial). At week 52, significantly (p ≤ 0.001) higher proportions of nintedanib than placebo recipients did not experience an absolute decline in the percentage of predicted FVC of more than 5% (both trials) or of more than 10% (INPULSIS-1 only) [9]; in the pooled dataset, significantly (p < 0.001) more nintedanib than placebo recipients did not experience an FVC decline of more than 5% (53% vs 39%) or of more than 10% (70% vs 61%) [9] and 25% of nintedanib recipients versus 9% of placebo recipients had either an improvement or no decline in FVC based on annual rate of FVC change [21].
The benefit of nintedanib over placebo for the annual rate of FVC decline was consistently demonstrated across prespecified subgroups based on race [22, 23] and other baseline characteristics including age, sex, FVC as a percentage of the predicted value, St. George’s Respiratory Questionnaire (SGRQ) total score, smoking status, systemic corticosteroid use and bronchodilator use [22]. In post hoc subgroup analyses, nintedanib improved the annual rate of FVC decline relative to placebo irrespective of DLCO or composite physiologic index (CPI) [24], presence of preserved lung function (FVC > 90% of the predicted value) [25], GAP (gender, age, physiology) stage (I vs II/III) [26], diagnostic criteria fulfilled [27], statin use [28] and anti-acid use [29] at baseline. FVC change from baseline to week 52 was similar between nintedanib recipients who had dose reductions and/or treatment interruptions during the trials and those who did not [30].
Nintedanib significantly prolonged the time to first investigator-reported acute exacerbation in INPULSIS-2 but not in INPULSIS-1 nor the pooled analysis (Table 2) [9]. A prespecified sensitivity analysis of pooled data on the time to the first confirmed or suspected acute exacerbation (per adjudication), however, indicated a significant (p = 0.001) benefit of nintedanib over placebo [9]. In post hoc pooled analyses, nintedanib significantly (p < 0.05 vs placebo) reduced the risk of a first acute exacerbation reported as a serious AE [31] and was associated with numerical improvements in 30-, 90- and 180-day mortality following an acute exacerbation [32].
With respect to HR-QOL, nintedanib significantly improved change in SGRQ total score from baseline to week 52 relative to placebo in INPULSIS-2 but not in INPULSIS-1 nor the pooled analysis (Table 2) [9]. Changes in SGRQ domain scores from baseline to week 52 were consistent with those in SGRQ total score [9]. Benefits of nintedanib for HR-QOL may be greater in subgroups with more advanced disease at baseline [33].
Over the 52-week treatment period, the proportion of patients who died from any cause was 5.5% in the nintedanib group versus 7.8% in the placebo group [hazard ratio (HR) 0.70; 95% CI 0.43 to 1.12] in a prespecified pooled analysis [9]. The rate of death from a respiratory cause was 3.8% with nintedanib versus 5.0% with placebo. Between randomization and 28 days after the last dose, deaths occurred in 3.8% and 6.1% of nintedanib and placebo recipients [9].
2.1.2 INPULSIS-ON
Patients who completed 52 weeks of treatment and the follow-up visit in INPULSIS-1 or INPULSIS-2 had the opportunity to receive open-label nintedanib in INPULSIS-ON (n = 430 previously receiving nintedanib and n = 304 previously receiving placebo) [10]. During INPULSIS-ON (which ended September 2017), the median exposure to nintedanib was 31.5 months (median total exposure 44.7 months in patients previously receiving nintedanib) and nintedanib was discontinued by 70% of patients [10].
Slowing of IPF progression was maintained over long-term treatment with nintedanib [10]. During INPULSIS-ON, the mean change in FVC from baseline to week 192 was − 327 mL in the overall trial population (n = 226 at week 192), − 349 mL in patients continuing on nintedanib (n = 138) and − 293 mL in patients who initiated nintedanib therapy in INPULSIS-ON (n = 88); the adjusted annual rates of FVC decline calculated over 192 weeks were − 135 mL/year, − 145 mL/year and − 120 mL/year in the corresponding groups. The adjusted annual rate of FVC decline over 192 weeks was generally consistent across subgroups based on age, race or FVC as a percentage of the predicted value at INPULSIS-ON baseline, and was similar irrespective of dose reduction or intensity. The incidences of acute exacerbations were 5.8 and 5.2 per 100 patient-years (PY) in patients who continued nintedanib and patients who initiated nintedanib, respectively. Over ≈ 5 years’ follow-up, 24% and 27% of patients in the respective groups died [10].
2.1.3 INSTAGE
INSTAGE enrolled adults ≥ 40 years of age diagnosed with IPF within the previous 6 years and with a single-breath DLCO (corrected for haemoglobin) ≤ 35% of the predicted value [12]. Patients received nintedanib 150 mg twice daily plus sildenafil 20 mg three times daily (n = 137) or nintedanib 150 mg twice daily plus placebo three times daily (n = 136) for 24 weeks. The primary endpoint was change from baseline in SGRQ total score at week 12. At baseline, patients had a mean age of 70 years, FVC ≈ 67% of the predicted value and DLco ≈ 26% of the predicted value. Mean exposure to nintedanib was ≈ 21 weeks in each group [12].
The addition of sildenafil to nintedanib did not significantly affect adjusted mean change from baseline in SGRQ total score at week 12 (primary endpoint); results in the nintedanib plus sildenafil arm will not be discussed further [12].
In INSTAGE, nintedanib alone slowed lung function deterioration to a similar rate as that seen in the INPULSIS trials [34]. The adjusted rate of decline in FVC was − 66.7 mL/24 weeks with nintedanib plus placebo in INSTAGE, compared with − 52.3 mL/24 weeks with nintedanib and − 102.8 mL/24 weeks with placebo in the INPULSIS trials; the adjusted mean absolute change from baseline in FVC was − 25.5 mL (vs − 25.4 and − 78.8 mL) at week 12 and − 58.2 mL (vs − 52.8 and − 106.4 mL) at week 24 [34]. In INSTAGE, mean changes in FVC from baseline to week 24 with nintedanib alone were similar between patients with and without emphysema (− 54.9 and − 58.2 mL) [35].
2.1.4 Real-World Studies
Real-world data on the long-term effectiveness of nintedanib in the treatment of IPF are available from a retrospective analysis of data from the European MultiPartner IPF (EMPIRE) registry, which compared nintedanib (n = 637), pirfenidone (n = 821), switched treatment (i.e. from nintedanib to pirfenidone or vice versa; n = 148) and other or no treatment (n = 1139) [19]. The clinical effectiveness of nintedanib (n = 593) and pirfenidone (n = 662) was also evaluated in a retrospective cohort analysis using data from a US insurance database, in which patients with IPF treated with an antifibrotic drug were one-to-one propensity score matched with untreated patients [17]. In addition, nintedanib treatment was associated with reduced lung function decline in patients with IPF in a prospective study in South Korea (n = 108) [20] and retrospective studies (n = 62–244) conducted in Germany [14, 15], Greece [13], Italy [16] and Japan [18]. These data are supported by several smaller studies (n < 60) which are not discussed.
Treatment with nintedanib was associated with improved overall survival (OS) and progression-free survival (PFS) in the EMPIRE registry [19]. Median OS from the entry to the registry was 84.7 months with nintedanib, 56.7 months with pirfenidone, 76.9 months with switched treatment and 37.5 months with other/no treatment. At 5 years, the survival rate was 0.62 with nintedanib, 0.46 with pirfenidone, 0.65 with switched treatment and 0.33 with other/no treatment; at 10 years, the survival rates were 0.36, 0.22, 0.49 and 0.14 in the respective groups. Median PFS from the entry to the registry was 22.9 months with nintedanib, 20.5 months with pirfenidone, 30.4 months with switched treatment and 17.3 months with other/no treatment [19].
Antifibrotic treatment with nintedanib or pirfenidone was associated with reduced early, but not long-term, mortality in the US insurance database study (mean duration of treatment 229 days with nintedanib and 241 days with pirfenidone) [17]. Patients treated with nintedanib or pirfenidone had significantly reduced all-cause mortality relative to the untreated matched cohort (13.78 vs 16.34 per 100 person-years; p = 0.034) [primary outcome], although the mortality benefit had dissipated by month 24. There were also significantly fewer acute hospitalizations in the treated cohort (46.70 vs 62.44 per 100 person-years in the untreated cohort; p < 0.001). In a subgroup analysis based on antifibrotic treatment, there was no significant difference between nintedanib and pirfenidone recipients in all-cause mortality (14.77 vs 12.83 per 100 person-years) [17].
2.2 In Other Chronic Fibrosing ILDs with a Progressive Phenotype
The efficacy of nintedanib in the treatment of patients with progressive fibrosing ILDs was evaluated in the randomized, double-blind, placebo-controlled, multinational, phase III INBUILD trial [36]. This trial enrolled adults with a physician-diagnosed fibrosing ILD, with fibrotic features affecting > 10% of lung volume on HRCT (as assessed by central review) and fulfilling at least one criteria for ILD progression within the 24 months prior to screening (i.e. relative FVC decline of ≥ 10% of the predicted value; relative FVC decline of 5 to < 10% of the predicted value plus worsening respiratory symptoms or an increased extent of fibrosis on HRCT; or worsening respiratory symptoms accompanied by an increased extent of fibrosis) despite receiving standard treatment. An FVC ≥ 45% of the predicted value and a DLCO (corrected for haemoglobin) 30 to < 80% of the predicted value were required at enrolment [36].
Patients received oral nintedanib 150 mg twice daily or matching placebo [36]. Randomization was stratified by imaging pattern [usual interstitial pneumonia (UIP)-like fibrotic pattern vs other fibrotic patterns], as assessed via central review. Treatment interruptions and/or a dosage reduction to nintedanib 100 mg twice daily were permitted in patients who had AEs. INBUILD Part A encompassed the first 52 weeks of the trial; Part B was a variable treatment period beyond week 52 during which patients continued to receive their blinded, randomized treatment until all other patients had completed the trial. The primary endpoint was the annual rate of decline in FVC, assessed over 52 weeks. There were two primary populations: the overall population and patients with a UIP-like fibrotic pattern on HRCT [36].
Baseline characteristics were similar in the two treatment groups and primary populations [36]. In the overall population, patients had a mean age of 66 years, a FVC 69% of the predicted value and a DLCO 46% of the predicted value. Chronic hypersensitivity pneumonitis (26%) and autoimmune ILDs (26%) were the most common ILD diagnoses. In the overall population, 76% and 85% of nintedanib and placebo recipients completed 52 weeks of treatment. During these 52 weeks, the mean durations of exposure to nintedanib and placebo were 10.3 months and 11.2 months [36].
Nintedanib significantly (p < 0.001) reduced the annual rate of FVC decline relative to placebo in the overall population and in patients with a UIP-like fibrotic pattern (Table 3) [36]. In these populations, the curves of observed decline from baseline in FVC separated by week 12 and continued to diverge. In patients with other fibrotic patterns, the benefit of nintedanib over placebo for annual rate of FVC decline (− 79.0 mL/year vs − 154.2 mL/year; between-group difference 75.3 mL; 95% CI 15.5–135.0) was similar to those in the primary populations [36]. A relative decline from baseline in FVC as a percentage of the predicted value of no greater than 5% was experienced by 47.6% of nintedanib recipients versus 31.4% of placebo recipients [odds ratio (OR) 2.01; 95% CI 1.46 to 2.76] in the overall population, while a relative decline of no greater than 10% was experienced by 59.3% versus 51.1% (OR 1.42; 95% CI 1.04–1.94) [37].
The benefit of nintedanib for FVC decline was largely consistent across prespecified subgroups based on ILD diagnosis, age, sex, race and baseline FVC [38, 39]. With respect to ILD diagnosis, treatment differences in annual rate of FVC decline were 73.1 mL/year (95% CI − 8.6 to 154.8) in hypersensitivity pneumonitis, 104.0 mL/year (95% CI 21.1–186.9) in autoimmune ILDs, 141.6 mL/year (95% CI 46.0–237.2) in idiopathic non-specific interstitial pneumonia, 68.3 mL/year (95% CI − 31.4 to 168.1) in unclassifiable idiopathic interstitial pneumonia, and 197.1 mL/year (95% CI 77.6–316.7) in other ILDs [39].
The adjusted mean absolute change from baseline in total King’s Brief Interstitial Lung Disease (K-BILD) total score did not meaningfully differ between nintedanib and placebo recipients in the overall population nor in patients with a UIP-like fibrotic pattern (Table 3) [36]. Relative to placebo, nintedanib was associated with less deterioration (p < 0.05) from baseline to week 52 in Pulmonary Fibrosis Impact on Quality of Life Scale summary score and Living with Pulmonary Fibrosis dyspnoea and cough symptom domain scores, symptoms score, impacts score and total score [40].
Over the 52-week treatment period, there were no substantial differences in risk of an acute exacerbation of ILD or death, or risk of death alone, between nintedanib and placebo recipients (Table 3) [36]. Over the whole trial (mean duration of exposure 15.6 and 16.8 months in the nintedanib and placebo groups), an acute exacerbation of ILD or death occurred in 13.9% of nintedanib recipients versus 19.6% of placebo recipients (HR 0.67; 95% CI 0.46–0.98) in the overall population and disease progression (i.e. absolute decline in FVC ≥ 10% of the predicted value) or death occurred in 40.4% versus 54.7% (HR 0.66; 95% CI 0.53–0.83); the HR for risk of death was 0.78 (95% CI 0.50–1.21) [41]. In a subgroup of patients with autoimmune disease-related ILDs (n = 170), 12.2% of nintedanib recipients versus 20.5% of placebo recipients died or experienced at least one acute exacerbation of ILD (HR 0.58; 95% CI 0.27–1.27) over the whole trial [42].
2.3 In SSc-ILD
The efficacy of nintedanib in the treatment of patients with SSc-ILD was evaluated in the randomized, double-blind, placebo-controlled, multinational, phase III SENSCIS trial [43]. SENSCIS enrolled adults fulfilling the ACR/EULAR classification criteria for systemic sclerosis with onset of first non-Raynaud’s symptom within the 7 years prior to screening. SSc-ILD was confirmed by a HRCT scan performed within the 12 months prior to screening showing fibrotic ILD to affect ≥ 10% of the lungs, as assessed by central review. Patients were also required to have an FVC ≥ 40% of the predicted value and a DLCO (corrected for haemoglobin) 30–89% of the predicted value. Background therapy with prednisone at a dosage of ≤ 10 mg/day and/or mycophenolate or methotrexate at a stable dosage for ≥ 6 months prior to randomization was permitted [43].
Patients received oral nintedanib 150 mg twice daily or matching placebo, with blinded treatment continuing until the last patient reached week 52 (maximum 100 weeks of treatment) [43]. Randomization was stratified based on the presence of antitopoisomerase I antibody (ATA; associated with FVC decline in early systemic sclerosis [44]). The primary endpoint was the annual rate of decline in FVC, assessed over 52 weeks [43].
Baseline characteristics were similar between the treatment arms [43]. Patients had a mean age of 54 years, FVC 73% of the predicted value and DLCO 53% of the predicted value. The mean extent of fibrotic ILD (based on assessment of the whole lung) was 36% and diffuse cutaneous systemic sclerosis was present in 52% of patients. From the first dose to week 52, the mean durations of exposure to nintedanib and placebo were 10.5 months and 11.4 months [43].
Nintedanib significantly (p = 0.04) reduced the annual rate of FVC decline relative to placebo (Table 4) [43]. Curves for FVC change from baseline separated by week 12 and continued to diverge. At week 52, an absolute decline from baseline in FVC of > 5 percentage points of the predicted value was experienced by 20.6% of nintedanib recipients versus 28.5% of placebo recipients (OR 0.65; 95% CI 0.44–0.96) and an absolute decline of > 10 percentage points of the predicted value was experienced by 7.0% versus 8.3% (OR 0.82; 95% CI 0.44–1.52) [43].
The benefit of nintedanib over placebo for the annual rate of FVC decline was generally consistent across prespecified subgroups based on age, sex, race, region, ATA status, systemic sclerosis subtype (limited cutaneous vs diffuse cutaneous) and mycophenolate use at baseline [43, 45]. The adjusted mean annual rate of FVC decline was − 40.2 mL/year with nintedanib versus − 66.5 mL/year with placebo in patients using mycophenolate at baseline and − 63.9 mL/year versus − 119.3 mL/year in patients not using mycophenolate at baseline [45]. Nintedanib also reduced annual FVC decline relative to placebo irrespective of the extent of lung fibrosis [46] or skin fibrosis [47] at baseline, FVC as a percentage of predicted value at baseline [48] or skin fibrosis progression over 52 weeks [49] (no significant treatment-by-time-by-subgroup interactions).
There were no significant differences between nintedanib and placebo recipients in mean absolute change from baseline in modified Rodnan skin score or SGRQ total score at week 52 (Table 4) [43]. For these key secondary endpoints, results from prespecified subgroup analyses were generally consistent with those in the overall population. Similarly, there were no significant treatment differences for absolute change from baseline in Health Assessment Questionnaire–Disability Index score or Functional Assessment of Chronic Illness Therapy-Dyspnoea score at week 52 [43].
The beneficial effect of nintedanib on lung function deterioration persisted over 100 weeks in analyses of data from the whole SENSCIS trial (median exposure to nintedanib and placebo 15.4 and 15.6 months) [50]. Over 100 weeks, a relative decline in FVC (mL) of > 5% occurred in 59.4% of nintedanib recipients versus 69.8% of placebo recipients (HR 0.80; 95% CI 0.65–0.99; p = 0.04) and a relative decline of > 10% occurred in 35.8% versus 40.6% (HR 0.88; 95% CI 0.67–1.14) [50]. In an exploratory analysis of survival over the whole trial, there was no difference in mortality between nintedanib and placebo recipients (3.5% vs 3.1%) [37, 51].
3 Tolerability of Nintedanib
Oral nintedanib had a manageable tolerability profile in clinical trials in patients with fibrotic ILDs [9, 11, 12, 36, 52, 53] and in real-world studies in patients with IPF (e.g. [13,14,15,16]). In a pooled analysis of safety data from the 52-week INPULSIS-1 and INPULSIS-2 trials (n = 638 and 423 treated with nintedanib and placebo; mean duration of exposure 10.3 months and 10.8 months respectively), the most frequent AEs with nintedanib were diarrhoea, nausea, nasopharyngitis, cough, vomiting, decreased appetite, bronchitis and IPF progression (Fig. 1) [54]. Among patients who experienced diarrhoea AEs, these were typically of mild or moderate intensity (in 94.5% of nintedanib recipients vs 97.4% of placebo recipients) and resolved without requiring treatment interruption or dose reduction (in 78.6% vs 98.7%). Their first diarrhoea AE typically occurred during the initial 3 months of treatment with nintedanib. Antidiarrhoeal therapies were used by 55.3% of nintedanib recipients and 25.6% of placebo recipients who experienced diarrhoea AEs [54].
Most common adverse events with nintedanib (reported in ≥ 10% of recipients) in the INPULSIS trials (pooled safety data) [54]. IPF idiopathic pulmonary fibrosis
Drug-related AEs occurred in 71.3% of nintedanib recipients versus 28.4% of placebo recipients [54]. AEs were severe in 27.3% of nintedanib recipients (vs 23.4% of placebo recipients), serious in 30.4% (vs 30.0%) and fatal in 5.8% (vs 7.3%). AEs led to a permanent dose reduction in a higher proportion of nintedanib than placebo recipients (15.8% vs 0.5%) and led to permanent treatment discontinuation in 19.3% of nintedanib recipients versus 13.0% of placebo recipients. The AEs most frequently leading to discontinuation in nintedanib recipients (≥ 2%) were diarrhoea (4.4% vs 0.2% of placebo recipients), IPF progression (2.0% vs 5.0%) and nausea (2.0% vs 0.0%) [54].
Longer-term safety data from INPULSIS-ON was consistent with that from INPULSIS-1 and INPULSIS-2, revealing no new safety signals [10]. The most frequent AE was diarrhoea, which occurred at a rate of 60.1 events/100 PY in patients who continued on nintedanib and 71.2 events/100 PY in patients who initiated nintedanib in INPULSIS-ON, and led to permanent treatment discontinuation in 5% (20/430) and 10% (31/304) of patients in the respective groups [10]. Likewise, no new safety signals emerged during the INSTAGE trial in patients with IPF and severe impairment in gas exchange [12, 34]. In INSTAGE, nintedanib had a similar AE profile to that in the INPULSIS trials in patients with milder disease (albeit with a higher frequency of serious AEs) and AEs led to permanent discontinuation of nintedanib in 19% of patients who received nintedanib plus placebo [34]. Global pharmacovigilance data for nintedanib in the treatment of IPF collected over 4 years (estimated cumulative exposure to nintedanib of 60,107 PY) were consistent with the safety profile established in clinical trials [55].
In a 12-week randomized, open-label, phase IV trial (INJOURNEY) in patients with IPF, nintedanib with add-on pirfenidone had a manageable safety and tolerability profile in keeping with the AE profile of each drug alone [56] (consistent with results of a phase IV 24-week trial [57]). On-treatment gastrointestinal (GI) AEs occurred in 69.8% of patients receiving nintedanib plus pirfenidone and 52.9% receiving nintedanib alone (primary endpoint) [56].
In patients with other progressive fibrosing ILDs (in the INBUILD trial [36]) and SSc-ILD (in the SENSCIS trial [43, 53]), the AE profile of nintedanib was similar to that in patients with IPF, with GI AEs predominating.
3.1 Adverse Events of Special Interest
GI AEs were the most frequently reported AEs in clinical trials and global pharmacovigilance data. In the latter, diarrhoea had an incidence rate of 301.6 events/1000 PY and most events of diarrhoea were non-serious (97%) [55]. GI perforation was rare, occurring at a rate of 1.0 event/1000 PY [55]. Diarrhoea should be managed with adequate hydration and antidiarrhoeal medication (e.g. loperamide) and patients with nausea or vomiting should receive appropriate supportive care including anti-emetic therapy if required [37, 51, 58]. If GI AEs cannot be managed with supportive care, dosage modifications or treatment interruptions (or, in severe cases, treatment discontinuation) may be required [37, 51].
Drug-induced liver injury, while uncommon, has been associated with nintedanib [37, 51, 58]. In global pharmacovigilance data, elevated liver enzyme or bilirubin levels occurred at a rate of 31.5 events/1000 PY, with a median time to first onset of 60 days [55]. Liver enzyme and bilirubin elevations were typically reversible with dose interruption or reduction in clinical trials [37, 51]. Certain patients may be at higher risk of elevations, including those who are female, Asian or of small physique [37, 51]. Liver function tests should be conducted before initiating treatment and at appropriate intervals thereafter [37, 51, 58]; consult local prescribing information for further details.
VEGF receptor inhibition by nintedanib may increase risk of bleeding (Table 1) [37, 51]. In pooled INPULSIS data, bleeding events were reported in 10.3% of nintedanib recipients versus 7.8% of placebo recipients [54]. The incidence of serious bleeding events was similar between treatment groups (1.3% vs 1.4%) [54]. Bleeding occurred at a rate of 36.8 events/1000 PY in global pharmacovigilance data, with the majority of bleeding events being non-serious (81%) and the most frequently reported type of bleeding event being epistaxis (25% of events) [55].
Arterial thromboembolic events have been infrequently reported with nintedanib [37, 51]. In the INPULSIS trials, cardiac disorder AEs occurred in 10.0% of nintedanib recipients (vs 10.6% of placebo recipients), serious cardiac disorder AEs occurred in 5.0% (vs 5.4%) and fatal cardiac disorders occurred in 0.5% (vs 1.4%) [54]. Major cardiovascular AEs and myocardial infarction were reported at rates of 13.4 and 4.3 events/1000 PY in global pharmacovigilance data [55]. Nintedanib use should be approached with caution in patients at higher cardiovascular risk [37, 51]. Treatment interruption should be considered if signs or symptoms of acute myocardial ischaemia develop [37, 51].
4 Dosage and Administration of Nintedanib
In the EU [37], nintedanib is indicated in adults for the treatment of IPF, other chronic fibrosing ILDs with a progressive phenotype and SSc-ILD. In the USA [51] and Canada [59], nintedanib is indicated for the treatment of IPF, the treatment of chronic fibrosing ILDs with a progressive phenotype and to slow the rate of decline in pulmonary function in patients with SSc-ILD. Nintedanib is available as 150 mg and 100 mg soft capsules [37, 51, 59]. The recommended dosage is 150 mg twice daily administered ≈ 12 h apart. A reduced dosage of 100 mg twice daily is only recommended for patients who have mild hepatic impairment (Child Pugh A; Table 1) or do not tolerate the higher dose. Capsules should be swallowed whole with water and taken with food (Table 1) [37, 51, 59]. Prior to the initiation of nintedanib, patients should undergo liver function tests and females of reproductive potential should have a pregnancy test [37, 51, 59]. Nintedanib may cause foetal harm when used during pregnancy [37, 51, 59]. In the EU [37] and Canada [59], the use of nintedanib during pregnancy is contraindicated. In the USA, females of reproductive potential should be advised to avoid becoming pregnant while receiving nintedanib [51]. Consult local prescribing information for detailed information regarding missed doses, management of adverse reactions, contraindications, warnings and precautions, and use in special populations.
5 Place of Nintedanib in the Management of Fibrotic ILDs
Antifibrotic drugs, while not curative, are capable of slowing ILD progression and have facilitated a paradigm shift in the treatment of IPF over the last decade. In countries such as those of the EU and the USA, the antifibrotics nintedanib and pirfenidone represent the only pharmaceuticals approved for use in IPF (with EU approval of pirfenidone being for mild or moderate disease only [60]). In the most recent international (ATS/ERS/JRS/ALAT) clinical practice guidelines for the treatment of IPF, nintedanib and pirfenidone each received a conditional recommendation for use [61]. Cost concerns may limit their use and must be considered in treatment decisions [61]. Nintedanib is the only drug approved for use in patients with other progressive fibrosing ILDs and SSc-ILD. While nintedanib is not included in the most recent EULAR guidelines for the treatment of systemic sclerosis [62], which were published prior to its approval, a recent European consensus statement names nintedanib as an option for treatment initiation or escalation in patients with SSc-ILD [63]. International treatment guidelines for ILDs other than IPF and SSc-ILD are not available.
Nintedanib was effective in reducing FVC decline, a surrogate endpoint for mortality [64], in the INPULSIS trials in patients with IPF (Sect. 2.1.1); mortality was not considered to be a feasible primary endpoint due to the low mortality rate seen in TOMORROW [65]. The benefit of nintedanib on the annual rate of FVC decline was present across all prespecified subgroups (Sect. 2.1.1) and persisted over an additional ≈ 4 years of treatment in INPULSIS-ON (Sect 2.1.2). Notably, nintedanib appears to reduce FVC decline irrespective of physiological impairment, with the annual rate of FVC decline in nintedanib recipients being comparable between the INSTAGE trial in patients with severe gas exchange impairment and the INPULSIS trials in patients with milder disease (Sect. 2.1.3). Treatment benefits for the risk of acute exacerbation and change in HR-QOL as assessed by SGRQ total score were significant in INPULSIS-2 but not INPULSIS-1 (Sect. 2.1.1). While the difference in mortality did not reach significance in the INPULSIS trials, large real-world studies suggest some improvement in survival with antifibrotic use (Sect. 2.1.4).
Consistent with the overlapping pathophysiology of fibrotic ILDs and the antifibrotic effects of nintedanib across preclinical models of these conditions (Table 1), nintedanib was similarly effective in reducing annual rates of FVC decline in the INBUILD trial in patients with chronic fibrosing ILDs with a progressive phenotype (e.g. chronic hypersensitivity pneumonitis, autoimmune ILDs) [Sect. 2.2] and the SENSCIS trial in patients with SSc-ILD (Sect. 2.3). The benefit of nintedanib on FVC decline was observed irrespective of fibrotic pattern on HRCT in INBUILD and was largely consistent across prespecified subgroups in each trial (Sect. 2). It should be noted that there was no clinical benefit of nintedanib for other manifestations of systemic sclerosis (including skin fibrosis and HR-QOL) in SENSCIS (Sect. 2.3). In INBUILD, changes in K-BILD total score were small in both treatment groups (Sect. 2.2).
Nintedanib had a manageable tolerability profile in patients with IPF in clinical trials and real-world studies (Sect. 3). While GI AEs such as diarrhoea and (to a lesser extent) nausea and vomiting were common with nintedanib, these were mostly of mild to moderate severity. Use of recommended management strategies allowed the majority of patients who experienced GI AEs to continue treatment with nintedanib; 4.4% of nintedanib recipients discontinued due to diarrhoea AEs during the 52-week INPULSIS trials (Sect. 3). The benefit of nintedanib for FVC decline was maintained in patients who underwent treatment interruptions and/or dose reduction for the management of AEs (Sect. 2.1.1). No new safety signals were identified during INPULSIS-ON or the global pharmacovigilance programme. In patients with other progressive fibrosing ILDs and SSc-ILD, AE profiles were similar to that established in patients with IPF (Sect. 3).
Nintedanib and pirfenidone have distinct mechanisms of action and are thought to target different components of the fibrotic cascade, suggesting the possibility for additive antifibrotic effects [56]. Currently, head-to-head comparisons of nintedanib and pirfenidone in the treatment of IPF are lacking. In the absence of direct comparisons, several network meta-analyses are available and generally indicate no clear differences in efficacy outcomes or rate of serious AEs between the two drugs (e.g. [66,67,68]). Both are associated with GI AEs (primarily diarrhoea with nintedanib and nausea with pirfenidone) [69]. Generally, the choice of drug should be reached through joint decision-making between clinician and patient, based on factors such as AE profiles, pill burden (greater with pirfenidone) and tolerability [69].
In conclusion, nintedanib is effective in reducing ILD progression in patients with fibrotic ILDs and has a manageable tolerability profile. Nintedanib continues to represent an important therapeutic option in patients with IPF. Nintedanib is the first drug to be approved for use in other chronic fibrosing ILDs with a progressive phenotype or SSc-ILD, with these approvals expanding the range of fibrotic ILDs for which nintedanib can be prescribed.
Data Selection Nintedanib: 598 records identified
Duplicates removed | 107 |
Excluded during initial screening (e.g. press releases; news reports; not relevant drug/indication; preclinical study; reviews; case reports; not randomized trial) | 47 |
Excluded during writing (e.g. reviews; duplicate data; small patient number; nonrandomized/phase I/II trials) | 364 |
Cited efficacy/tolerability articles | 47 |
Cited articles not efficacy/tolerability | 33 |
Search Strategy: EMBASE, MEDLINE and PubMed from 1946 to present. Clinical trial registries/databases and websites were also searched for relevant data. Key words were nintedanib, Ofev, pulmonary fibrosis, ILD. Records were limited to those in English language. Searches last updated 23 Feb 2021 | |
Change history
29 May 2021
A Correction to this paper has been published: https://doi.org/10.1007/s40265-021-01543-9
13 April 2021
A Correction to this paper has been published: https://doi.org/10.1007/s40265-021-01519-9
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During the peer review process, the manufacturer of nintedanib was also offered an opportunity to review this article. Changes resulting from comments received were made on the basis of scientific and editorial merit.
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Yvette N. Lamb is a salaried employee of Adis International Ltd/Springer Nature, and declares no relevant conflicts of interest. All authors contributed to the review and are responsible for the article content.
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The original article has been updated: Due to title update.
The original version of this article was revised due to a retrospective Open Access order.
The manuscript was reviewed by: S. A. Antoniu, Department of Medicine II – Nursing/Palliative Care, Grigore T. Popa University of Medicine and Pharmacy, Iaşi, Romania; P. S. Burge, Occupational Lung Disease Unit, Birmingham Heartlands Hospital, Birmingham, UK; A. U. Wells, Interstitial Lung Disease Unit, Royal Brompton Hospital, London, UK.
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Lamb, Y.N. Nintedanib: A Review in Fibrotic Interstitial Lung Diseases. Drugs 81, 575–586 (2021). https://doi.org/10.1007/s40265-021-01487-0
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DOI: https://doi.org/10.1007/s40265-021-01487-0