The efficacy of ANZUPGO was evaluated in two randomized, double-blind, vehicle-controlled, 16-week trials (TRIAL 1 [NCT04871711] and TRIAL 2 [NCT04872101]) which enrolled a total of 960 adult subjects with moderate to severe CHE who had a history of inadequate response to, or for whom topical corticosteroids were not advisable. All subjects who completed TRIAL 1 and TRIAL 2 were eligible to enroll into a long-term extension trial (TRIAL 3 [NCT04949841]).
Disease severity of enrolled subjects was defined using the Investigator's Global Assessment for chronic hand eczema (IGA-CHE) score and the Hand Eczema Symptom Diary (HESD) itch score (weekly average). The IGA-CHE is the investigator's overall assessment of chronic hand eczema at a given time point on a scale ranging from 0 (clear) to 4 (severe). The HESD itch score assesses disease severity of pruritus using a scale ranging from 0 (no symptoms) to 10 (severe symptoms). Subjects enrolled in these three trials had an IGA-CHE score of 3 or 4 (moderate or severe, respectively) and a HESD itch score (weekly average) of ≥ 4 points at baseline.
Across all treatment groups in TRIAL 1 and TRIAL 2, the mean age of enrolled subjects was 44.1 years, and 8% of subjects were 65 years of age or older, 64% were female, 90% were White, 4% were Asian, and 1% were Black. For ethnicity, 94% of subjects identified as not Hispanic or Latino and 3% of subjects identified as Hispanic or Latino. The primary classifications of CHE by subtype were atopic hand eczema (35.9%), hyperkeratotic eczema (21.5%), irritant contact dermatitis (19.6%), allergic contact dermatitis (13.9%), vesicular hand eczema (9.1%), and contact urticaria/protein contact dermatitis (0.1%). Across all trial arms, 28% of subjects were diagnosed with two or more overlapping CHE subtypes.
The HESD itch score is a weekly average of daily itch severity on an 11-point scale from 0-10 that assesses the maximal intensity of pruritus in the last 24 hours with 0 being no pruritus and 10 being the worst pruritus. The HESD pain score is a weekly average of daily pain severity on an 11-point scale from 0-10 that assesses the maximal intensity of pain in the last 24 hours with 0 being no pain and 10 being the worst pain. In these trials, 28% of subjects had a baseline IGA-CHE score of 4 (severe CHE). The mean baseline HESD itch and pain scores were 7.1 and 6.7, respectively.
In both trials, subjects applied either topical ANZUPGO or vehicle twice daily to affected areas on the hands and wrists for 16 weeks. The primary efficacy endpoint was the proportion of subjects who achieved IGA-CHE treatment success (IGA-CHE TS) at Week 16, defined as a score of 0 (clear) or 1 (almost clear) with at least a 2-point improvement from baseline. Table 1 describes the efficacy results at Week 16 in TRIAL 2. Figure 1 describes the proportion of subjects who achieve IGA-CHE TS during the 16-week treatment period in TRIAL 1 and TRIAL 2. Figures 2 and 3 describe the proportion of subjects who achieved HESD itch ≥ 4-point improvement and HESD pain ≥ 4-point improvement during the 16-week treatment period in TRIAL 1 and TRIAL 2.
Figure 1: Proportion of Adult Subjects with Moderate to Severe CHE who Achieved IGA-CHE Treatment Success (0 or 1 with ≥2-point improvement from baseline) Over Time in TRIAL 1 and TRIAL 2
Figure 2: Proportion of Adult Subjects with Moderate to Severe CHE who Achieved HESD Itch ≥ 4-point Improvement Over Time in TRIAL 1 and TRIAL 2
Figure 3: Proportion of Adult Subjects with Moderate to Severe CHE who Achieved HESD Pain ≥ 4-point Improvement Over Time in TRIAL 1 and TRIAL 2