AMSTERDAM, Netherlands — For patients with atopic dermatitis (AD) who responded to the anti-interleukin (IL)-13 monoclonal antibody lebrikizumab in the pivotal trials, the level of response, including 90% skin clearance, has generally remained unchanged among those followed up for an additional 2 years, according to the latest data from an extension study. 

At the end of the maintenance phase of the pivotal trials at 12 months, 84% of the patients enrolled into the extension had clear or almost clear skin, as per the Investigator Global Assessment (IGA). This overall figure as well as the proportion with even better responses have persisted unchanged, reported Diamant Thaçi, MD, PhD, professor and head of the Comprehensive Center for Inflammatory Medicine, University of Lübeck, Lübeck, Germany. 

Responses at 3 Years Maintained

“This is really quite remarkable,” Thaçi said. “Roughly all the patients maintained their response.” 

These results became even more remarkable when patients were assessed for their use of adjunctive therapy to control flares. 

“Over the whole follow-up, 90% had no need for topical corticosteroids or any other rescue therapy,” Thaçi reported, providing data from the ADjoin lebrikizumab extension study during a late breaking news session at the 2024 European Academy of Dermatology and Venereology meeting. 

The patients in ADjoin were enrolled from the pivotal phase 3 ADvocate 1 and 2 trials completed almost 2 years ago and published together in March 2023. Lebrikizumab was approved in the United States in September 2024 for moderate to severe AD in patients aged ≥ 12 years, following previous approvals in Europe in 2023 and in Japan in January 2024. 

In these two identical trials with a total of 564 patients, the primary endpoint was an IGA of 0 or 1, signifying clear or almost clear skin. At nearly 40%, the proportion of patients reaching this outcome at 16 weeks was about threefold greater (P < .001) on lebrikizumab than on placebo. The benefit was similar on secondary endpoints, such as 75% improvement in the Eczema Area and Severity Index (EASI75) score. 

At the end of the double-blind, placebo-controlled 16-week phase of the ADvocate 1 and 2 trials, which enrolled adults and adolescents aged ≥ 12 years, responders were enrolled into a maintenance phase in which they were re-randomized to 250 mg lebrikizumab every 2 weeks (Q2W) or every 4 weeks (Q4W). The latter is the approved maintenance dose. 

At the end of the maintenance phase, which lasted another 32 weeks (total exposure of 52 weeks for those initially randomized to lebrikizumab), patients were invited into the ADjoin extension. The only exclusions from the extension were serious adverse events related to lebrikizumab and noncompliance. 

Response Curves Appear as Straight Lines

Over the next 2 years of ADjoin, response curves appeared as straight lines not only for the overall response but when patients were stratified for different levels of response at the extension study entry. Specifically, 81.5% and 83.3% had an IGA score of 0 or 1 in the Q2W and Q4W arms at completion of the ADvocate 16-week double-blind phase. At 3 years, the rates were 84.0% and 82.9%, respectively. 

For the subgroup who entered ADjoin with an EASI75 or an EASI90 response, the persistence of this level of response over 2 years was similar, although there was some gain observed among those who entered the trial with an EASI75 response. 

“Not only did these patients maintain their response, but the response on average slowly improved, so that there were more patients with an EASI90 response at the 3-year timepoint,” Thaçi said.

Of the 181 patients in the ADjoin extension, 82 patients were maintained on Q2W dosing and 99 were maintained on Q4W lebrikizumab. Their mean age was about 35 years, more than half were women, and nearly 40% had severe AD at the time they enrolled in the ADvocate trials. 

There was essentially no difference in response rates among those in the Q2W and Q4W arms over time in ADjoin. 

Side Effect Profile Essentially Unchanged

The side effect and tolerability profiles, which were favorable in the original 16-week placebo-controlled study, have remained unchanged over the subsequent maintenance phase and through the additional 2 years of the ADjoin extension.

“There continued to be reports of conjunctivitis, which is very specific for anti-IL13 therapies,” Thaçi said. However, he said that the incidence did not increase over time, and because it was easy to treat, “most patients do not discontinue lebrikizumab for this reason.” Moreover, he said the impression was that “the number of patients experiencing adverse effects has been decreasing over time.” 

Calling these long-term results “very exciting,” Thaçi called lebrikizumab “a very valuable option for long-term AD care.” 

Asked for his perspective on the results, Jonathan I. Silverberg, MD, PhD, Director of Clinical Research, Department of Dermatology, George Washington University, Washington, DC, said that that it is important to study long-term efficacy, and these results are positive. Without direct comparisons to other biologics available for AD, nothing can be implied about the relative efficacy of monoclonal antibodies approved for AD, he noted. 

“These data are important both from an efficacy and safety perspective” for those advising patients who need chronic AD treatment, said Silverberg, who was the principal investigator of the ADvocate trials. 

Earlier this year, 5-year follow-up data were published for dupilumab. Of 326 patients who remained on therapy this long, 220 (67%) maintained an IGA of 0 or 1 at the end of the study. There were no unexpected adverse events, which were generally stable or declined throughout the study. 

Thaçi has financial relationships with AbbVie, Amgen, Boehringer Ingelheim, Bristol Myers Squibb, Celltrion, Galderma, Leo Pharma, L’Oreal, Janssen-Cilag, New Bridge, Novartis, Pfizer, Regeneron, Roche, Sanofi, Sun Pharma, UCB, and Vichy. Silverberg reported financial relationships with more than 40 pharmaceutical companies including those that make drugs for AD. Ratzinger reported financial relationships with AbbVie, Almirall, Boehringer-Ingelheim, Eli Lilly, Janssen, Leo Pharma, Novartis, Pelpharma, Pfizer, and UCB.

Ted Bosworth is a medical journalist based in New York City.