SINGAPORE – conducted in Singapore has found.
“Abrocitinib and upadacitinib surprisingly appeared to have better treatment efficacy compared to baricitinib,” said study lead Yik Weng Yew, MD, PhD, MPH, deputy head of research at Singapore’s National Skin Centre (NSC), who presented the results at the 25th World Congress of Dermatology. “But overall, as a group, I think they show a very good treatment response, as well as a good effect on itch response.”
Sandy Ong
Dr. Yik Weng Yew
JAK inhibitors are used to treat a variety of inflammatory diseases including alopecia areata, rheumatoid arthritis, and inflammatory bowel disease. Although treatment for severe eczema was previously limited to topical steroids and oral immunosuppressants, there are now two oral JAK inhibitors – abrocitinib and upadacitinib – approved in 2022 by the Food and Drug Administration for treating AD, which affects up to 2.4% of the global population. (A topical formulation of ruxolitinib, a JAK inhibitor, was approved for AD in 2021.)
The Singapore study is one of the few that have examined the safety and efficacy of JAK inhibitors for treatment of AD in a non-White population.
Chinese population
For the 12-week trial, conducted in 2022, Dr. Yew and associates recruited 35 patients from the NSC. More than half of participants (64%) were men and most (96%) were of Chinese ethnicity. Four of every five patients had previously received systemic agents: 17% had been treated with one systemic agent, 18.9% with two, 15.1% with three, 22.6% with four, and 3.8% with five. The most commonly used agents were cyclosporine (62.3%), methotrexate (47.2%), azathioprine (39.6%), and dupilumab (35.8%).
“The switch in therapy could have been a result of inadequate efficacy or cost reasons because in Singapore patients pay out of pocket for AD treatments,” said Dr. Yew.
Additionally, he offered a caveat on the profile of participants: “Perhaps they were more difficult atopic eczema patients, and therefore, the efficacy [of JAK inhibitors] might be a bit different.”
Clearer skin, less itch
Patients received one of the three study drugs: baricitinib (66%), abrocitinib (21%), and upadacitinib (13%). The distribution was “affected by reimbursement patterns and availability of the drug,” explained Dr. Yew.
They were assessed at weeks 4 and 12. By study end, the proportion of patients who self-reported an improvement in their condition was 100% for upadacitinib, 90% for abrocitinib, and 69% for baricitinib.
Scores on the Investigator Global Assessment (IGA) also improved with treatment. Patients in the baricitinib group saw their mean score fall from 4.0 to 3.0 by week 4, then to 2.0 by week 12. With upadacitinib and abrocitinib, “you can see that there is a nice decrease in IGA responses,” said Dr. Yew, referring to the larger improvement in scores experienced by patients on those two treatments. For patients on upadacitinib, IGA decreased from 3.5 to 2 at 4 weeks, then to 0.5 at 12 weeks, while those taking abrocitinib had their scores drop from 4.0 to 2.0 at 4 weeks, then to 1.0 at 12 weeks.
When it came to itch reduction, the abrocitinib group experienced the biggest reduction, with a median reduction of 5.5 points in itch score. Median reduction in itch score was 4 points for the other two groups. “Oral JAK inhibitors appear to have a good effect on itch response,” said Dr. Yew.
However, the researchers observed no significant reduction in percentage of body surface area affected, the last outcome assessed.
The most commonly reported adverse events were increased creatine kinase levels (11.3% of patients), increased LDL cholesterol levels (9.4%), and herpes zoster (9.4%). Those in the abrocitinib reported a higher number of these adverse events, compared with the other two treatment groups. (There were no herpes zoster cases among those taking baricitinib.)
For herpes zoster, Dr. Yew said “the common recommendation” is to give the inactivated shingles vaccine. “But the problem is that, number one, these patients would have probably failed multiple agents so they probably can’t wait for you to vaccinate before you initiate treatment.”
In addition, people in Singapore have to pay out-of-pocket for the two vaccine doses, “which is probably a month’s worth of medication,” he noted. “So we have a lot of resistance from patients.”
Additionally, Dr. Yew noted that contrary to what has previously been reported in the literature, there were few complaints of acne as a side effect in the Singaporean study population.