A Dose Escalation Trial of Safety, Pharmacokinetic/Pharmacodynamic and Preliminary Clinical Activity of Briquilimab in Adult Patients With Chronic Inducible Urticaria (CIndU) Who Remain Symptomatic Despite Treatment With H1- Antihistamines

Exclusion Criteria

• •1. Women who are pregnant or nursing or intend to become pregnant during the course of the trial
• •2. Participants weighing less than 40 kg or more than 125 kg at Screening
• •3. Dominant comorbid chronic urticaria with a clearly defined predominant or sole trigger (chronic inducible urticaria) other than ColdU or SD, including, heat-, solar-, pressure-,delayed pressure-, aquagenic-, cholinergic-, or contact urticaria as well as variants of cold induced urticaria or familial cold autoimmune syndrome except CSU (see inclusion criterion #5)
• •4. Other active diseases with possible symptoms of urticaria, wheals or angioedema, including urticarial vasculitis, erythema multiforme, cutaneous mastocytosis (urticaria pigmentosa), and hereditary or acquired angioedema (e.g., due to C1 inhibitor deficiency)
• •5. Any other active skin disease associated with chronic itching that might confound the trial evaluations and results in the opinion of the Investigator (e.g., atopic dermatitis, bullous pemphigoid, dermatitis herpetiformis, senile pruritus, etc.)
• •6. History of severe anaphylaxis as defined by Sampson et al. (Section 25.1 ) within 5 years of Screening
• •7. Any H2 antihistamine, leukotriene receptor antagonist or tricyclic antidepressant use within 3 days prior to Screening
• •8. Experimental monoclonal antibody therapy (e.g., dupilumab, ligelizumab, etc.) within 6 months or Janus kinase (JAK) inhibitors or experimental Bruton Tyrosine Kinase (BTK) inhibitors within 5 half-lives prior injection of IP
• •9. Immunosuppressive therapy (e.g., systemic corticosteroids, cyclosporine, methotrexate, dapsone, cyclophosphamide, tacrolimus and mycophenolate mofetil, hydroxychloroquine, etc.) within 4 weeks (or 5 half-lives, whichever is longer) prior to injection of IP
• •10. ECG findings at Screening that are considered clinically significant
• •11. Alanine aminotransferase (ALT) or aspartate aminotransferase (AST) \> 1.5 x Upper limit of normal (ULN) at Screening
• •12. Serum total bilirubin \>1.5 x ULN, unless attributable to Gilbert's syndrome
• •13. Estimated creatinine clearance (eCrCl) by Cockcroft-Gault equation using total body weight \< 60 mL/min
• •14. Known HIV-, hepatitis B-, hepatitis C infection, or acute/long-COVID
• •15. Major abdominal or thoracic surgery within 8 weeks prior to Screening or planned surgery during trial participation
• •16. Male participants (who are not vasectomized) who are not willing to use highly effective contraceptive methods (when having sexual intercourse with a female partner of childbearing potential (Section 9.2) and who are not willing to abstain from sperm donation during the trial and for at least 150 days after last IP dosing. A male participant is considered vasectomized if he had a vasectomy at least 4 months prior to Screening and if he has received post-surgical medical assessment of the surgical success of the vasectomy.
• •17. Female participants of childbearing potential not willing to use highly effective contraceptive methods (Section 9.2) during the trial and for at least 150 days after IP dosing in case of early withdrawal. Women of non-childbearing potential, must be surgically sterile (i.e., had undergone complete hysterectomy, bilateral oophorectomy, or tubal ligation) or be in menopausal state (at least 1 year without menses).
• •18. Participation in another research trial involving the use of an IP within the last 30 days (or 5 half-lives of IP, whichever is longer) prior to Screening
• •19. Any known contraindications or hypersensitivity to any component of IPs, drugs of similar chemical classes (i.e., to murine, chimeric or human antibodies) or antihistamines, leukotrienes
• •20. Any other acute or chronic medical or psychiatric condition or laboratory abnormality that could increase the risk associated with trial participation or IP administration or could interfere with the interpretation of trial results and, in the judgment of the Investigator, would make the participant inappropriate for entry into the trial
• •21. Participants not willing to abstain from blood donations while being on the trial (Screening to EOT)
• •22. Close affiliation with the Investigator (e.g., a close relative, financially dependent on the trial site) or participant who is an employee of the Sponsor's company