Does TYK2/JAK1 Show Potential in Inflammatory Diseases? - Report - MDSpire

Does TYK2/JAK1 Show Potential in Inflammatory Diseases?

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  • Andrea Surnit

  • July 6, 2026

  • 3 min

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Clinical Report: Does TYK2/JAK1 Show Potential in Inflammatory Diseases?

Overview

The first-in-human phase 1 trial of SDC-1801, a TYK2/JAK1 inhibitor, demonstrated good tolerability and biomarker changes indicative of pathway inhibition. The study involved 95 healthy participants and highlighted pharmacokinetic properties and safety profiles.

Background

The TYK2/JAK1 signaling pathway is implicated in various inflammatory and autoimmune diseases. Current treatments for conditions like inflammatory bowel disease (IBD) often leave patients unresponsive.

Data Highlights

ParameterValue
Participants95
Dosage Range5 mg to 150 mg
Peak Plasma Concentration Time3 to 5 hours
Half-Life15 to 27 hours
Adverse EventsMild or moderate

Key Findings

  • SDC-1801 was well tolerated with no serious adverse events reported.
  • Headache was the most common treatment-emergent adverse event.
  • Pharmacokinetic analyses indicated a half-life of 15 to 27 hours.
  • Food intake modestly increased drug exposure, suggesting improved absorption.
  • Evidence of pharmacologic activity included reductions in IP-10 and high-sensitivity C-reactive protein.

Clinical Implications

The safety profile and biomarker effects observed in this study were reported, indicating the need for further evaluation of SDC-1801.

Conclusion

The findings from the phase 1 trial of SDC-1801 indicate its safety and pharmacokinetic properties.

Related Resources & Content

  1. Brearley C, et al., British Journal of Clinical Pharmacology, 2023 -- First‐in‐human, phase I, randomized, safety, pharmacokinetic, food‐effect and pharmacodynamic study of a tyrosine kinase 2/Janus kinase 1 inhibitor, SDC‐1801
  2. Journal of Crohn's and Colitis — Hit the road JAK: is there still hope left for TYK2 inhibition in IBD?
  3. Frontiers in Immunology — JAK-STAT pathway-associated skin diseases: a refined functional framework for inflammatory skin diseases
  4. Journal of Crohn's and Colitis — Discordant Effects of Janus Kinase Inhibition Ex Vivo on Inflammatory Responses in Colonic Compared to Ileal Mucosa
  5. Frontiers in Immunology — Cardiovascular safety and early myocardial deformation signal after upadacitinib initiation in immune-mediated inflammatory disorders
  6. Living guideline for pharmacological management of moderate-to-severe ulcerative colitis
  7. EULAR recommendations for the management of rheumatoid arthritis with synthetic and biologic disease-modifying antirheumatic drugs: 2025 update
  8. ACG Clinical Guideline Update: Ulcerative Colitis in Adults - PubMed
  9. EULAR recommendations for the management of psoriatic arthritis with pharmacological therapies: 2023 update - PMC
  10. FDA requires warnings about increased risk of serious heart-related events, cancer, blood clots, and death for JAK inhibitors that treat certain chronic inflammatory conditions | FDA
  11. SOTYKTU (deucravacitinib) Highlights of Prescribing Information
  12. Deucravacitinib in plaque psoriasis: Four‐year safety and efficacy results from the Phase 3 POETYK PSO‐1, PSO‐2 and long‐term extension trials - Armstrong - 2025 - Journal of the European Academy of Dermatology and Venereology - Wiley Online Library
  13. POS0496 DEUCRAVACITINIB IN MODERATE TO SEVERE PLAQUE PSORIASIS: 5-YEAR, LONG-TERM SAFETY AND EFFICACY RESULTS FROM THE PHASE 3 POETYK PSO-1, PSO-2, AND LTE TRIALS - ScienceDirect
  14. Deucravacitinib, an oral, selective, allosteric, tyrosine kinase 2 inhibitor, in patients with active SLE: efficacy on patient-reported outcomes in a phase II randomised trial - PMC
  15. Deucravacitinib, a Tyrosine Kinase 2 Inhibitor, in Systemic Lupus Erythematosus: A Phase II, Randomized, Double‐Blind, Placebo‐Controlled Trial - PMC
  16. Efficacy and safety of selective TYK2 inhibitor, deucravacitinib, in a phase II trial in psoriatic arthritis - PubMed
  17. Comparative Efficacy of Advanced Therapies for Management of Moderate-to-Severe Ulcerative Colitis: 2024 AGA Evidence Synthesis - PMC
  18. Comparative Efficacy of Biologics and Small Molecule in Ulcerative Colitis: A Systematic Review and Network Meta-analysis - ScienceDirect
  19. Effectiveness and Safety of Janus Kinase Inhibitors in Acute Severe Ulcerative Colitis: A Systematic Review and Meta-Analysis - Clinical Gastroenterology and Hepatology
  20. First‐in‐human, phase I, randomized, safety, pharmacokinetic, food‐effect and pharmacodynamic study of a tyrosine kinase 2/Janus kinase 1 inhibitor, SDC‐1801 - Brearley - British Journal of Clinical Pharmacology - Wiley Online Library

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