Safety of baricitinib in children
The labeling for JAK inhibitors that have been approved to date, including baricitinib, include a boxed warning regarding risks for thrombosis, major adverse cardiovascular events, and all-cause mortality. The warning is based on use by patients with rheumatoid arthritis.
Dr. Torello summarized baricitinib’s safety profile in the trial as being “consistent with the well-known safety profile for baricitinib in adults with moderate to severe atopic dermatitis.”
In the study, no severe adverse effects were noted, and no new safety signals were observed, he said. The rate of any treatment-emergent effect among patients was around 50% and was similar across all baricitinib and placebo groups. Study discontinuations because of a side effect were more frequent in the placebo arm (1.6% of patients) than in the baricitinib low-, medium-, and high-dose arms (0.8%, 0%, and 0.8%, respectively).
There were no cases of deep-vein thrombosis, pulmonary embolism, or other adverse effects of special interest, including major adverse cardiovascular events, gastrointestinal perforations, and opportunistic infections, Dr. Torrelo said.
No patient experienced elevations in liver enzyme levels, although there were some cases of elevated creatinine phosphokinase levels (16% in the placebo group and 19% in the baricitinib arms altogether) that were not from muscle injury. There was a possible increase in low-density cholesterol level (3.3% of those taking placebo vs. 10.1% of baricitinib-treated patients).
Is there a role for baricitinib?
“Baricitinib is a potential therapeutic option with a favorable benefit-to-risk profile for children between 2 and 18 years who have moderate to severe atopic dermatitis, and candidates for systemic therapy,” Dr. Torrelo said. “No single drug is capable to treat every patient with atopic dermatitis,” he added in discussing the possible place of baricitinib in pediatric practice.
“There are patients who do not respond to dupilumab, who apparently respond later to JAK inhibitors,” he noted.
“We are trying to work phenotypically, trying to learn what kind of patients – especially children who have a more heterogeneous disease than adults – can be better treated with JAK inhibitors or dupilumab.” There may be other important considerations in choosing a treatment in children, Dr. Torrelo said, including that JAK inhibitors can be given orally, while dupilumab is administered by injection.
Asked to comment on the results, Jashin J. Wu, MD, founder and CEO of the Dermatology Research and Education Foundation in Irvine, Calif., pointed out that “only the higher dose is significantly more effective than placebo.”
In his view, “the potentially severe adverse events are not worth the risk compared to more effective agents, such as dupilumab, in this pediatric population,” added Dr. Wu, who recently authored a review of the role of JAK inhibitors in skin disease. He was not involved with the baricitinib study.
The study was funded by Eli Lilly in collaboration with Incyte. Dr. Torello has participated in advisory boards and/or has served as a principal investigator in clinical trials for AbbVie, Eli Lilly and Company, Novartis, Pfizer, Pierre Fabre, and Sanofi. Dr. Wu has been an investigator, consultant, or speaker for multiple pharmaceutical companies.
A version of this article first appeared on Medscape.com.