Merck (NYSE: MRK), known as MSD outside of the United States and Canada, today announced the first presentation of results from MK-7240-012, a Phase 2b multicenter, randomized, double-blind, placebo-controlled trial evaluating tulisokibart, an investigational humanized monoclonal antibody targeting tumor necrosis factor-like cytokine 1A (TL1A), in patients with moderate to severe hidradenitis suppurativa (HS). These data will be presented in a Late-Breaking News session at the European Academy of Dermatology and Venereology (EADV) 2026 Congress (Abstract ID: LB-26).

The study met its primary endpoint of Hidradenitis Suppurativa Clinical Response 50 (HiSCR50) at week 16 for patients treated with both high-dose (480 mg Q2W) and medium-dose (480 mg Q4W) tulisokibart regimens, demonstrating superiority over placebo. Specifically, 72% of patients in the high-dose group (n=42) and 64% in the medium-dose group (n=42) achieved HiSCR50—representing a 37% and 29% improvement over the placebo group (35%, n=44), respectively. In an exploratory analysis, the low-dose group (n=21, 240 mg Q4W) achieved a 52% response rate, a 17% improvement over placebo. There was comparable safety between tulisokibart and placebo groups in this trial.

For the non-ranked key secondary endpoints at week 16, both the high- and medium- dose groups showed greater numerical improvement over placebo. HiSCR75 was achieved by 41% of high-dose, 40% of medium-dose, and 29% of low-dose patients, compared to 15% in the placebo group—representing numeric improvements over placebo of 27%, 24%, and 13%, respectively. Additionally, patient quality of life numerically improved, with mean Dermatology Life Quality Index (DLQI) reductions from baseline of -5.62 (a 3.16-point improvement over placebo) for the high-dose cohort and -3.50 (a 1.02-point improvement over placebo) for the medium-dose cohort, compared to a baseline reduction of -2.46 in the placebo group. The low-dose cohort showed no improvement over placebo.

“Hidradenitis suppurativa is a painful, chronic disease that can have a profound physical and emotional impact on patients,” said Alexa B. Kimball,* MD, MPH, lead investigator of the study, President and CEO of Harvard Medical Faculty Physicians at Beth Israel Deaconess Medical Center, and Professor of Dermatology at Harvard Medical School. “Despite available advanced therapies, many still do not achieve long-term disease control. Results from the MK-7240-012 trial are promising and suggest the potential for meaningful improvement in the management of this difficult-to-treat condition.”

“We are excited to expand the clinical data for tulisokibart beyond inflammatory bowel disease with these positive Phase 2b results—the first for the anti-TL1A class in dermatology,” said Dr. Aileen Pangan, vice president and therapeutic area head, immunology clinical research, Merck Research Laboratories. “We look forward to advancing tulisokibart to Phase 3 for patients living with HS.”

Adverse events (AEs) occurred in 42.9%, 47.6%, and 52.4% of participants receiving high-, medium-, and low-dose tulisokibart, respectively, compared with 40.9% in the placebo group. Serious AEs were infrequent and occurred at similar rates across treatment groups: 2.4% in both the high- and medium-dose groups, 4.8% in the low-dose group, and 2.3% with placebo. No serious or opportunistic infections were observed in the study.

These data presented at EADV will inform Phase 3 development for tulisokibart in HS. Tulisokibart has the broadest development program in the novel anti-TL1A class and is currently being evaluated in six disease indications across multiple immune-mediated inflammatory diseases. Phase 3 studies include ATLAS-UC (NCT06052059) in ulcerative colitis (UC) and ARES-CD (NCT06430801) in Crohn’s disease (CD). Phase 2 studies are evaluating tulisokibart in rheumatoid arthritis (RA) (NCT07176390), psoriatic arthritis (PsA) (NCT07486960), radiographic axial spondyloarthritis (r-axSpA) (NCT07133633), and HS (NCT06956235). For an overview of Merck’s clinical development program in immunology, please click here.

*Dr. Kimball is the lead investigator of the MK-7240-012 trial and a paid consultant to Merck.

About MK-7240-012

MK-7240-012 (NCT06956235) is a Phase 2b, randomized, double-blind, placebo-controlled study designed to evaluate the efficacy and safety of tulisokibart in participants with moderate to severe HS. The study is investigating whether at least one dose of tulisokibart is superior to placebo in the proportion of participants achieving HiSCR50 at week 16. A participant is considered to have achieved HiSCR50 if they have at least a 50% reduction in total abscesses and inflammatory nodules with no increase in abscess count and no increase in draining tunnel count. Bayesian design was implemented to augment concurrent controls with historical placebo for the primary endpoint.

Participants were randomized to receive a high-dose, medium-dose, or low-dose tulisokibart regimen, or placebo, during a 16-week double-blind treatment period. Key secondary endpoints included the percentage of participants achieving HiSCR75 and the mean change from baseline in DLQI at week 16.

About hidradenitis suppurativa

Hidradenitis suppurativa (HS) is a chronic inflammatory skin disease characterized by painful nodules and abscesses that can progress to tunnels, fibrosis, and scarring. HS is a high-burden, progressive disease that remains undertreated, with persistent gaps in disease control and progression management. Worldwide, HS affects approximately 1 in 100 people.

About tulisokibart

Tulisokibart is an investigational anti-TL1A monoclonal antibody that blocks TL1A signaling, downregulating Th1, Th2, and Th17, thereby potentially disrupting the immuno-fibrotic loop in immune-mediated inflammatory diseases, including UC, CD, RA, PsA, r-axSpA, and HS.

About immuno-fibrosis

Immuno-fibrosis is the process by which inflammation and fibroblast activation drive disease activity and progression in many autoimmune conditions, including HS. Immuno-fibrotic diseases are chronic, progressive conditions marked by immune dysregulation, inflammation, and fibroblast activation. The impact of immuno-fibrosis may vary by disease, stage, and patient. The complexity of immuno-fibrosis underscores the need for treatment options that address both inflammation and fibrosis. Merck is advancing research to deepen the understanding of immuno-fibrosis and help translate the science into new approaches.

Merck’s commitment to immunology

Advances in our understanding of human biology have led to the emergence of innovative medicines and new modalities that aim to change approaches to the treatment of immune-mediated inflammatory diseases. Merck scientists are leveraging deep expertise in immunology to discover and develop therapies to help people living with these conditions. Our research is focused on investigating novel targets such as TL1A and CD30L, as well as newer modalities like T-cell engagers, and exploring their potential across a range of immune-mediated inflammatory diseases.

About Merck

At Merck, known as MSD outside of the United States and Canada, we are unified around our purpose: We use the power of leading-edge science to save and improve lives around the world. For more than 130 years, we have brought hope to humanity through the development of important medicines and vaccines. We aspire to be the premier research-intensive biopharmaceutical company in the world – and today, we are at the forefront of research to deliver innovative health solutions that advance the prevention and treatment of diseases in people and animals. We foster a diverse and inclusive global workforce and operate responsibly every day to enable a safe, sustainable and healthy future for all people and communities. For more information, visit www.merck.com and connect with us on X (formerly Twitter), Facebook, Instagram, YouTube and LinkedIn.

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