From the Journals

INPULSIS-ON: Nintedanib shows manageable long-term safety for IPF

Publish date: January 15, 2019
By
Amy Karon
MDedge News

View on the News

Bias may compromise efficacy data

The study provides “invaluable safety data, including a very low incidence of cardiovascular events” among patients who received long-term nintedanib therapy for idiopathic pulmonary fibrosis, wrote Athol U. Wells, MD, in an editorial published alongside the study.

But the efficacy data were substantially more problematic, he said. “At first sight, the data seem to show that treatment benefits are sustained during long-term follow-up. However, this finding applied to patients completing 4 years of treatment. Approximately 70% of patients discontinued nintedanib [during the open-label extension trial].”

Death, probable treatment failure, or adverse events unrelated to idiopathic pulmonary fibrosis accounted for 62% of withdrawals from this study, and the investigators did not present FVC trends for these patients, he noted. This makes it difficult to know whether bias affected the efficacy results. Long-term stability or slow progression was seen in 30%-40% of patients, exceeding results from previous IPF cohorts, but “this finding, although encouraging, is clearly non-definitive.”

The mortality data also were problematic because the trial excluded patients with major comorbidities and severe disease, and the researchers only tracked vital status for 6 weeks after patients withdrew from INPULSIS-ON, he said. “One cannot help but feel that a major opportunity was lost in this study and, equally, in the pirfenidone extension study. An intention-to-treat study design would have provided invaluable long-term efficacy data and should be prioritized in future.”

Dr. Wells is with Royal Brompton Hospital in London. He disclosed personal fees from Boehringer Ingelheim, Intermune/Roche, Bayer, Actelion, and Raffo, outside the submitted work (Lancet Respir Med. 2018 Sep 14. doi: 10.1016/S2213-2600[18]30385-0).


 

FROM THE LANCET RESPIRATORY MEDICINE

For patients with idiopathic pulmonary fibrosis, up to 68 months of treatment with nintedanib showed acceptable safety and tolerability and might have slowed disease progression, according to the results of the open-label INPULSIS-ON trial.

a virtual imagining of an x-ray of the lungs is shown Purestock/thinkstockphotos

No new safety signals were identified among patients who continued nintedanib or switched from placebo to the medication after completing one of the two 52-week phase 3 INPULSIS trials, reported Bruno Crestani, MD, of Hôpital Bichat, Paris, and his associates. The safety profile otherwise resembled that seen in the INPULSIS trials they added. “Patients with idiopathic pulmonary fibrosis could use nintedanib over the long term to slow disease progression,” they wrote in Lancet Respiratory Medicine.

Idiopathic pulmonary fibrosis has had a poor prognosis – before antifibrotic therapy became available in the United States, median survival after diagnosis was estimated at 3-5 years, the researchers noted. Patients often die or deteriorate because of acute declines in respiratory function, often from unknown causes. Nintedanib (Ofev) is an intracellular tyrosine kinase inhibitor first approved for idiopathic pulmonary fibrosis in the United States in 2014, based on the results of the replicate randomized, placebo-controlled, double-blind, phase 3 INPULSIS trials, in which nintedanib (150 mg twice daily) was usually tolerable, showed an acceptable overall toxicity profile, and significantly lessened the annual rate of decline in forced vital capacity (FVC), compared with placebo.

Because idiopathic pulmonary fibrosis has a chronic trajectory, data on long-term safety and efficacy were clearly desirable. “Results from the open-label extension of the [foundational] phase 2 TOMORROW trial [also] identified no new safety signals and suggested an effect of nintedanib on slowing the progression of idiopathic pulmonary fibrosis beyond 52 weeks; however, only 35 patients treated with nintedanib 150 mg twice daily entered the extension study,” Dr. Crestani and his associates noted.

The open-label INPULSIS-ON extension trial included 734 patients, which was 91% of the population that completed the INPULSIS trials. A total of 59% patients in the open-label trial continued nintedanib while the rest switched to nintedanib from placebo. When considering both cohorts, the median duration of exposure to nintedanib was 44.7 months (range, 1.9-68.3 months).

Rates of major adverse cardiovascular events were 2.4 per 100 person-years of drug exposure among treatment initiators and 3.6 per 100 person-years among continuers, the researchers reported. Rates of bleeding were 6.7 and 8.4 events per 100 person-years, respectively, while rates of myocardial infarction, using the broadest possible definition, were 0.7 and 1.3 events per 100 person-years, respectively. The most common adverse event was diarrhea, with 60.1 and 71.2 events per 100 person-years among treatment initiators and continuers, respectively. In all, 10% of treatment initiators and 5% of continuers stopped nintedanib because of diarrhea. A total of 14% of treatment initiators and 12% of continuers stopped treatment because they experienced progression of idiopathic pulmonary fibrosis, making this adverse event the most common reason to stop treatment.

The adjusted annual rate of decline in FVC was −135.1 mL overall, –145 mL in nintedanib continuers, and –119.7 mL in nintedanib initiators, which resembled the findings of the INPULSIS trials, the researcher said. They added that the difference in FVC decline between INPULSIS-ON nintedanib initiators and continuers does not seem clinically meaningful, especially given that the average FVC decline in the INPULSIS placebo group was −223.5 mL per year, and the minimal clinically important difference in FVC is thought to be 2%-6% predicted, a difference of at least 75 mL-80 mL.

Boehringer Ingelheim funded the study. Dr. Crestani disclosed grants and personal fees from Boehringer Ingelheim and Roche, grants from Apellis and MedImmune, and personal fees from AstraZeneca and Sanofi.

SOURCE: Crestani B et al. Lancet Respir Med. 2018 Sep 14. doi: 10.1016/S2213-2600(18)30339-4.

Next Article:

Lung screening complications costly, more prevalent than in trial setting