“This may be a good oral option for our patients. It could be similar to the Otezla [apremilast] story in psoriasis: It’s perhaps not as effective as a lot of the biologics, but patients often prefer an oral option,” Dr. Silverberg said.
Of note, in one large, placebo-controlled, phase 3 study of baricitinib on top of background low- or medium-potency topical steroids, the IGA 0/1 rate at 16 weeks with placebo plus topical steroids was a modest 14.7%, which underscores that this long-time workhorse topical therapy is objectively less effective than most physicians think. In contrast, the IGA 0/1 rate with baricitinib at 4 mg/day plus topical steroids was a more respectable 30.6%.
All three oral JAK inhibitors have rapid onset of efficacy, a key advantage over the biologic agents.
“The issue you have to keep in mind is safety. The safety in the atopic dermatitis population was overall quite good for all three drugs. However, safety concerns have come up with JAK inhibitors in rheumatoid arthritis. I think that’s the part we watch the most in this. The efficacy has become clear. Now the question is where does the safety take us,” he said.
Novel injectable biologics
Nemolizumab: This humanized monoclonal antibody inhibits IL-31 receptor alpha. Mounting evidence implicates IL-31 as both a proinflammatory and immunomodulatory cytokine linking the immune and neural systems.
Early on, most researchers pigeonholed IL-31 as being a key player only in the itch factor in AD. Not so. Indeed, Dr. Silverberg was the lead investigator in a recent phase 2b study of nemolizumab that demonstrated the biologic is also effective at rapidly clearing AD lesions. The study, which evaluated three different doses in 226 adults with moderate to severe AD and severe pruritus who were on background topical corticosteroids, showed that nemolizumab at 30 mg every 4 weeks trounced placebo in terms of itch reduction: The 69% drop from baseline in Peak Pruritus Numeric Rating Scale at week 16 was twice that in controls, with a significant difference apparent even at week 1.
But in addition, the 33% IGA 0/1 rate at the same time point bested the 12% rate in controls. The EASI 75 response rate was significantly higher as well – 49% versus 19% – as was the EASI 90 response of 33%, compared with 9% in controls. Moreover, nemolizumab-treated patients used close to 40% less topical steroids during the study (J Allergy Clin Immunol. 2020 Jan;145[1]:173-82).
“This is something that’s fascinating. The study gets into the idea that a subset of atopic dermatitis patients have the itch that rashes, and perhaps if you break the itch/scratch cycle you can modify the lesions. Or the effect may even be due to the direct anti-inflammatory action of IL-31 blockade,” Dr. Silverberg observed.
It appeared that a plateau hadn’t been reached for some endpoints out at week 24, when the study ended. Japanese phase 3 studies have been completed, with what he called “great results,” and others are ongoing in the United States.