Delgocitinib Takes on Established Treatments

AMSTERDAM — The Janus kinase inhibitor delgocitinib may be a better or comparable choice for treating hand eczema than some more established therapies, suggested the results of two separate studies presented during the late-breaking sessions at the European Academy of Dermatology and Venereology (EADV) 2024 Congress.

In the 24-week, phase 3 DELTA FORCE trial, topical delgocitinib was compared head-to-head with oral alitretinoin for managing chronic hand eczema (CHE). Results showed that greater improvements from baseline to week 12 in Hand Eczema Severity Index (HECSI) scores could be achieved with delgocitinib cream than with alitretinoin capsules.

And in another analysis, which involved patients with the atopic subtype of CHE only, the application of topical delgocitinib was found to be as good as treatment with subcutaneous dupilumab (Dupixent) at improving both HECSI scores and the Investigator Global Assessment (IGA) for CHE response (IGA-CHE).

Potentially a ‘Highly Impactful’ Therapy

“Chronic hand eczema is a common yet burdensome skin condition that poses a considerable challenge for dermatologists. Diversity in morphologic presentation and clinical etiology has been a key limitation for the development of a safe, targeted, one-size-fits-all therapeutic approach,” Raj Chovatiya, MD, PhD, clinical associate professor at Chicago Medical School, Rosalind Franklin University of Medicine and Science, and the founder and director of the Center for Medical Dermatology and Immunology Research in Chicago, told Medscape Medical News.

“These data show that delgocitinib cream is poised to be a novel and highly impactful topical therapy for the treatment of CHE,” said Chovatiya.

DELTA FORCE showed that the efficacy and safety of delgocitinib cream was “superior to alitretinoin, the only approved oral option for CHE,” he said. And the other study, a comparative analysis, showed that delgocitinib’s efficacy was “comparable to the biologic dupilumab specifically for the treatment of atopic hand eczema,” said Chovatiya, one of the authors of that study. He was not an author of the DELTA FORCE study.

DELTA FORCE

While it remains an investigational drug in the United States, where it is under US Food and Drug Administration review for CHE, delgocitinib cream (Anzupgo) was recently approved by the European Commission for use in adults with moderate to severe hand eczema who do not respond to or who are unable to use topical corticosteroids. Approval was based on data from two phase 3 studies, DELTA 1 and DELTA 2, which compared delgocitinib cream against a cream vehicle, as well as an open-label, long-term extension study, DELTA 3.

In the DELTA FORCE study, 513 adults with severe CHE (IGA-CHE score of 4) were recruited at 102 clinical centers in Europe and North America and randomly allocated to topical treatment with delgocitinib cream, 20 mg/g applied twice daily, or alitretinoin capsules, 30 mg once daily. Treatment with delgocitinib was for 16 weeks, and treatment with alitretinoin was for 12 weeks. The latter’s dose could be reduced to 10 mg in the event of intolerability, and both treatments could be reintroduced if necessary, with a final follow-up at 24 weeks.

Study investigator Ana Maria Giménez-Arnau, MD, PhD, of the Hospital del Mar Research Institute, Pompeu Fabra University, Barcelona, Spain, who presented the findings, noted that alitretinoin (Toctino) is an oral systemic retinoid approved in a few European countries, Canada, Israel, and South Korea for the treatment of severe CHE.

The mean age of the participants was 45 years, almost two thirds were women, and the majority (93%) were White; 90% of patients had been recruited in Europe. The median duration of CHE was 4 years.

At baseline, the median HECSI score was recorded as 79.5 in the delgocitinib arm and 80.0 in the alitretinoin arm. At 12 weeks, the least squares mean change in HECSI score from baseline was −67.6 in the delgocitinib arm and −51.5 in the alitretinoin arm, giving a significant difference of −16.1 between the two groups (P

Giménez-Arnau reported that delgocitinib also outperformed alitretinoin for all other endpoints assessed, including the following: ≥ 90% improvement in HECSI (HECSI-90), IGA-CHE treatment success (defined as a score of 0/1 indicating clear/almost clear skin), changes in Hand Eczema Symptom Diary (HESD) itch and HESD pain scores, area under the curve for HECSI-90, change in Dermatology Life Quality Index score — which were all assessed at 12 weeks — and change in HECSI from baseline to week 24.

There was “significant improvement in the reduction of the HECSI from the first week” of treatment, Giménez-Arnau said at the meeting. Notably, she said that the effect increased to 12 weeks and then was sustained. A similar pattern was seen for IGA-CHE treatment success and for HESD pain. This is important as “chronic hand eczema is really painful,” she said.

As for safety, 49.4% of patients in the delgocitinib arm vs 76.1% of patients in the alitretinoin arm experienced any type of adverse event (AE). Serious AEs occurred in 2% and 4.9% of patients in each group, respectively, with fewer AEs leading to trial drug discontinuation observed in the delgocitinib arm (1.2% vs 10.1%). The proportion of AEs “probably or possibly” related to the trial drug was 9.5% in the delgocitinib group vs 54.3% in the alitretinoin group.

Comparison With Dupilumab in Another Trial

Delgocitinib is no longer just an investigational medication, April W. Armstrong, MD, MPH, professor and chief of dermatology, University of California Los Angeles, said during a separate late-breaking presentation at the EADV 2024 meeting. “I think it’s big news because now we have an important topical option for our patients with chronic hand eczema,” she said.

Armstrong presented a matched-adjusted indirect comparison (MAIC) of delgocitinib vs dupilumab for the treatment of moderate to severe atopic hand eczema, which she described as “the next best thing” to a head-to-head trial.

MAICs are where patient level data from one or more clinical trials evaluating drug “A” are compared with aggregate data from one or more clinical trials evaluating drug “B.” In this case, individual patient data from the DELTA 1 and DELTA 2 trials of delgocitinib were compared with published aggregate data from the phase 3 LIBERTY-AD-HAFT trial of dupilumab.

A total of 201 patients with atopic hand eczema in the DELTA 1 and DELTA 2 trials were matched to 133 patients in the LIBERTY-AD-HAFT trial. Of these, 128 had been treated with delgocitinib cream, 73 with a cream vehicle, 67 with subcutaneous dupilumab, and 66 with a subcutaneous placebo.

“We’re trying to compare as much as possible apples to apples here in terms of the etiology of hand eczema,” Armstrong said. She noted that after matching and weighting based on age, sex, race, and baseline HECSI score, baseline characteristics in the two groups of patients were similar. The mean age was about 35.8 years in the two active treatment arms and 33.4 years in the two placebo arms, and mean baseline HESCI scores were about 79-80.

The endpoints compared were ≥ 75% improvement in HECSI; HECSI-90, HECSI percentage improvement, and IGA-CHE in the DELTA 1 and DELTA 2 trials; or a Hand and Foot IGA score of 0/1.

“The key message to take away from this is that there were no statistically significant differences between topical delgocitinib twice daily vs subcutaneous injection of dupilumab by week 16 in the treatment of patients with atopic hand dermatitis,” Armstrong reported. Odds ratios varied between 1.1 and 1.3 for the various endpoints.

Menno de Rie, MD, PhD, professor of dermatology and immunology at Amsterdam UMC in Amsterdam, the Netherlands, who co-chaired the session said: “I appreciate very much that you took the effort to compare these totally different compounds and showed us the methodology that you did. It’s really very impressive.”

Topical, Systemic, or Both?

Armstrong was questioned on how to manage someone with atopic hand dermatitis who developed lesions elsewhere on the body.

“I would take a really individualized approach to this patient,” she responded. If the eczema has been limited to the hands and has been there for a while, then perhaps delgocitinib would be her choice, but if they developed lesions elsewhere on the body, then a systemic treatment such as dupilumab may be preferable.

“The good thing is that this study shows that you can offer the patient either of those options and really engage the patient in a shared decision-making process.”

And with regards to whether the two might possibly be used together, Armstrong acknowledged insurance coverage restrictions could be a limiting factor in the United States, but elsewhere — and from a scientific point of view — this could make sense.

“If we have a patient, for example, who has moderate to severe atopic dermatitis involving the body, but also very severe hand eczema as well, one may possibly consider a combination of a systemic medication that’s helpful for the extensive area of involvement on the body…and now you have a topical therapy, delgocitinib, where you can use it locally, have very deep efficacy locally, to kind of help augment that disease phenotype in that patient population.”

The studies were funded by Leo Pharma A/S. Chovatiya, Giménez-Arnau, and Armstrong acknowledged ties to LEO Pharma, among other pharmaceutical companies.

Sara Freeman is a freelance medical journalist based in London, England.