DARMSTADT, GERMANY -- Merck, a leading global science and technology company, announced the first patient was dosed in the Phase 3 program, ELOWEN-1 (NCT07332481) and ELOWEN-2 (NCT07355218), evaluating enpatoran in people living with lupus who experience active skin manifestations.

“People living with lupus continue to face significant challenges in achieving disease control and are very often affected by itchy, painful and stigmatized skin manifestations,” said David Weinreich, Global Head of R&D, Merck. “With enpatoran, we aim to target the underlying drivers of lupus and redefine how to approach the disease by understanding both visible skin manifestations and systemic activity.”

Enpatoran is an oral selective toll-like receptor (TLR) 7/8 inhibitor designed to modulate pathways central to lupus-related inflammation.[1] By targeting these upstream drivers, enpatoran has the potential to impact disease activity and address a key aspect of the lupus mechanism that remains difficult to manage with current treatment approaches, while preserving the body’s broader immune function.[1]

“The ELOWEN program builds on Phase 2 findings, where enpatoran demonstrated clinically meaningful improvements in patients with active cutaneous manifestations, regardless of their underlying lupus diagnosis,” said Professor Eric Morand, principal investigator. “These studies are designed to further explore how targeting shared inflammatory pathways may benefit patients across the lupus spectrum.”

Lupus is a chronic autoimmune disease that can affect multiple organ systems, including the skin, joints, kidneys and central nervous system.[2] Up to 85% of patients experience skin manifestations, which are among the most visible signs of disease and may reflect underlying immune-driven inflammation.[1]

Skin manifestations can be life-altering and sometimes are irreversible on their own.[3],[4] They can present as inflamed, photosensitive lesions on the face, scalp and other areas, and may lead to scarring or pigment changes.[5] Despite their prevalence and the fact that skin manifestations are the first sign of disease in nearly one third (29%) of cases,[1] many patients still do not achieve adequate disease control.[6]

“Skin symptoms impose a profound and multilayered burden that lingers long after flares subside. The lesions are visible, disfiguring and often painful, and the psychological weight can be equally debilitating, breeding a loss of identity that standard clinical assessments often fail to capture,” said Dr. Joy Buie, PhD, VP of Research at the Lupus Foundation of America. “These consequences erode participation in work, social life, and intimate relationships as self-consciousness and deliberate avoidance quietly reshape how patients navigate the world around them. It is vital we recognize skin manifestations as a visible and clinically actionable signal of underlying systemic disease ”

ELOWEN-1 and ELOWEN-2 are two global randomized, double-blind, placebo-controlled Phase 3 studies evaluating enpatoran taken twice daily versus placebo, on top of standard of care, in patients with lupus who have active cutaneous manifestations. The ELOWEN studies will be conducted in 266 sites in 26 countries. Each study will recruit approximately 200 lupus participants, and the primary endpoint will be a change in CLASI-A from baseline.