, underscoring the medication’s stable safety profile over an extended duration.
Those are among the key findings from an integrated analysis of long-term upadacitinib use presented by Christopher G. Bunick, MD, PhD, during a late-breaking abstract session at the Revolutionizing Atopic Dermatitis Virtual Conference. Upadacitinib (Rinvoq) is an oral Janus kinase (JAK) inhibitor, approved by the Food and Drug Administration for adults and pediatric patients aged 12 years of age and older with refractory, moderate to severe AD in January 2022.
“What makes this study special is that these patients are followed for 260 weeks, or 5 years, and it encompasses over 7,000 patient-years of exposure,” said Dr. Bunick, associate professor of dermatology at Yale University, New Haven, Connecticut. “This is a milestone because it’s the longest safety study ever published for any systemic drug for AD.”
Dr. Christopher G. Bunick
He and his colleagues evaluated the safety data for up to 5 years of upadacitinib 15 mg and 30 mg use in adolescents and adults with moderate to severe AD, based on the results of integrated data from three ongoing global multicenter phase 3 trials: Measure Up 1, Measure Up 2, and AD Up. Patients in the trials were randomized 1:1:1 to receive oral upadacitinib 15 mg, upadacitinib 30 mg, or placebo once daily alone (Measure Up 1 and 2) or with concomitant topical corticosteroids (AD Up). At week 16, patients receiving 15 mg or 30 mg upadacitinib during the double-blind period continued their assigned treatment in the blinded extension (BE) period, whereas patients receiving placebo were randomized 1:1 to receive either 15 mg or 30 mg upadacitinib in the BE period. The integrated analysis included 2683 patients (529 adolescents and 2154 adults) who received at least one dose of upadacitinib. Of these, 1337 received the 15-mg dose, while 1346 received the 30-mg dose. The researchers analyzed treatment-emergent events of special interest as exposure-adjusted rates per 100 patient-years (PY) for the entire treatment period to adjust for potentially different follow-up durations.
According to Dr. Bunick, researchers often refer to “100 patient-years” in safety analyses to measure how common certain events are. “It is a straightforward way to convey the collective experience of the study’s participants over time,” he told this news organization. “For instance, if 100 patients are each monitored for 1 year, or 50 patients for 2 years each, both scenarios amount to 100 patient-years. This metric allows clinicians to understand how often certain adverse events occur across a diverse group over a specific time frame, providing a clear picture of long-term safety.”
Upadacitinib trials in atopic dermatitis have included diverse patient groups with varying risk factors. “Patients were not cherry-picked,” he said. “What I mean by that is that about 50% of patients enrolled in these trials had, at baseline, at least one cardiovascular risk factor: about 30% used tobacco; 10% had hypertension, and 5% had a history of a cardiovascular event.” In addition, about 15% were over age 50 with one cardiovascular risk factor and about 20% had a body mass index (BMI) greater than 30 kg/m2. Among women in the study, about 20% were on oral contraceptives, yet none developed a venous thromboembolism (VTE).
In the integrated analysis, the rate of treatment-emergent adverse events that led to discontinuation of upadacitinib was about 4.2 events per 100 PY, “meaning that this medicine shows durability,” Dr. Bunick said. “Very few people are discontinuing due to adverse events.”
Serious and opportunistic infections ranged from 1.6 to 2.8 events per 100 PY, but these were stable across the 1- to 5-year time points. The rates of active TB were less than 0.1 per 100 PY, while the rates of herpes zoster ranged from 3.5 to 5.5 events per 100 PY. “The key take-home point here is that 5% or less of the patients at baseline had received the shingles vaccine, so it’s very important to talk to patients about receiving the shingles vaccine before they go on upadacitinib,” Dr. Bunick advised, because “this could reduce risk of herpes zoster occurring in upadacitinib-treated patients substantially.”
In other findings, incidence rates of nonmelanoma skin cancer (NMSC) ranged between 0.3 and 0.4 per 100 PY, while the rate of malignancy excluding NMSC ranged between 0.3 and 0.4 per 100 PY. Meanwhile, the rates of gastrointestinal perforations and VTE stood at 0.1 per 100 PY or lower, and MACE incidence rates ranged from 0.1 to 0.2 per 100 PY.
During his presentation, Dr. Bunick compared findings related to malignancy (excluding NMSC), MACE, and VTE to other published real-world background rates observed in moderate to severe AD populations. He noted that, while the malignancy rate in the current trial ranged from 0.3 to 0.4 per 100 PY, an observational study of more than 66,000 AD patients in the United Kingdom reported a malignancy (excluding NMSC) background incidence rate of 0.33 per 100 PY, and SEER data estimate that the malignancy incidence rate in the US general population is 0.45 per 100 PY. “Therefore, patients on upadacitinib at the 5-year mark are right at the AD population baseline risk,” he said.
And while the incidence rate of MACE in the current trial ranged from less than 0.1 to 0.2 per 100 PY, the background incidence rate of MACE in a Danish observational study of more than 2,500 patients with moderate to severe AD was 0.63 per 100 PY. “This suggests that there may be an anti-inflammatory and even a cardiovascular protective effect for patients on upadacitinib,” Dr. Bunick said.
As for VTE, the incidence rate in the current trial was 0.1 per 100 PY, but VTE background incidence rate observed in a moderate to severe AD population in the United States is 0.31 per 100 PY. “Again, this suggests anti-inflammatory and cardiovascular protective effects of upadacitinib in AD patients at the 5-year mark,” he said. “Reporting of MACE, VTE, and malignancy (excluding NMSC) in upadacitinib phase 3 clinical trials for AD generally reflects the background observations of these events in the AD population.”
He acknowledged certain limitations of the study, including the fact that observational data may overestimate the risk of adverse events.
Discussing the incidence rates for MACE, VTE, and malignancy in upadacitinib AD trials, Dr. Bunick remarked, “these are rock-bottom rates that have been low through 5 years of treatment.”
Dr. Bunick disclosed that he has received grant or research support from AbbVie (the manufacturer of upadacitinib), Almirall, Ortho Dermatologics, Timber, and Palvella. He is also a consultant and/or an adviser to AbbVie, Almirall, Apogee, Connect Bropharma, Arcutis, Eli Lilly, Novartis, Pfizer, Sanofi-Regeneron, Ortho Dermatologics, Leo Pharma, and UCB.