Minghui Pharmaceutical, a late-stage biopharmaceutical company dedicated to developing transformative medicines in immunology and oncology, today announced positive topline results from its phase Ⅲ trial of MH004 (tofacitinib etocomil) ointment 1.0%, a twice-daily pan-Jak inhibitor, in adolescents (ages 12 years and older) and adults with mild to moderate atopic dermatitis (AD).

This multicenter, double-blind, randomized, vehicle-controlled phase Ⅲ clinical trial was conducted to evaluate the efficacy and safety of MH004 1.0% in adolescents and adults with mild to moderate AD. A total of 377 participants were randomized 2:1 to receive either MH004 1.0% or Vehicle BID with an 8-week treatment period, followed by 44-week open-label extension for long-term safety.

The primary endpoints were the proportion of participants achieving IGA-TS (Investigator Global Assessment (IGA) of 'clear' or 'almost clear' with a 2-grade improvement) at Week 4 and the proportion achieving a 75% improvement in Eczema Area and Severity Index (EASI-75) at Week 4. Key efficacy results are as follows:

• IGA-TS at Week 4
  41.0% of individuals treated with MH004 1.0% achieving IGA-TS at Week 4 compared to 10.3% treated with vehicle (P<0.0001).

• EASI-75 at Week 4
  58.2% of individuals treated with MH004 1.0% achieving EASI-75 at Week 4 compared to 19.8% treated with vehicle (P<0.0001).

Additionally, the key secondary endpoints, including IGA-TS and EASI-75 at week 8, as well as the proportion of participants with a ≥ 4-point improvement in Itch Numerical Rating Scale (NRS4) score at week 8, were successfully met. MH004 1.0% demonstrated statistically significant improvements across all these parameters compared to the vehicle.

MH004 1.0% was well-tolerated, with a safety profile consistent with findings from the previous Phase II study. All TRAEs were mild to moderate (grade 1 or 2) in severity. No drug-related serious adverse events (SAEs) were reported.

"We are thrilled with the positive topline results from the Phase Ⅲ study. MH004 showed significant symptom improvement in patients with atopic dermatitis and was well-tolerated." said Guoqing Cao, Ph.D., Chief Executive Officer of Minghui Pharmaceutical. "The rapid onset of action observed with MH004 is particularly valuable for patients. These findings reinforce MH004's potential as a meaningful addition to current treatment options for atopic dermatitis, addressing both safety and efficacy needs. Moreover, MH004's benefits may extend to other inflammatory skin diseases as well. In our ongoing phase Ⅱ for vitiligo, we have seen convincing PoC, and the preliminary efficacy data looks highly encouraging."

Dr. Cao continued, "I would like to extend my sincere gratitude to all the patients who participated in the trial, as well as to the physicians and staff for their dedicated work. Their contributions were essential to the success of this trial. We look forward to working with regulators to make this treatment available to patients as soon as possible."

"Atopic dermatitis is a chronic inflammatory condition, particularly prevalent in children, underscoring the urgent need for effective, fast-acting topical therapies beyond corticosteroids." said Jianzhong Zhang, M.D., lead investigator in the Phase 3 trial and Professor of Peking University People's Hospital. "While corticosteroids are reasonably effective, their long-term use is often limited due to local side effects and safety concerns. MH004 demonstrated superior clinical efficacy in this pivotal phase Ⅲ study, achieving the co-primary endpoints of IGA-TS and EASI-75. The treatment also exhibited a favorable safety profile, and as the leading PI of this study, I am highly encouraged by these results and optimistic about MH004's potential to advance AD care."