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NCT Number: NCT07665723

An Early-Stage Study in Multiple Clinics of How Afimkibart May Affect the Body's Processing of Medicines That Rely on Cytochrome P450 Enzymes in Participants With Ulcerative Colitis

The purpose of this study is to evaluate the disease-drug-drug interaction (DDDI) potential of afimkibart (also known as RO7790121). This will be assessed by the characterization of the pharmacokinetics (PK) of cytochrome P450 (CYP) enzyme substrates alone and after administration of afimkibart in participants with moderately to severely active ulcerative colitis (UC).

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Key information

Conditions

Active Ulcerative Colitis

Age range

18 year–60 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 1

Primary location

Charite Research Organisation GmbH, Berlin, Germany

Loading trial locations.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Body weight >= 40kg
  • Agreement to adhere to the contraceptive requirements

UC Specific Inclusion Criteria:

  • Confirmed diagnosis of UC with supportive clinical, endoscopic, and histopathological evidence
  • Active UC confirmed by endoscopy (flexible sigmoidoscopy or colonoscopy) extending >=15 cm from the anal verge
  • Moderately to severely active UC, defined as an modified Mayo score of 5 to 9 points, including a Mayo endoscopic subscore of 2 or 3, confirmed through centrally read endoscopy

Exclusion criteria

Inflammatory Bowel Disease (IBD) Exclusion Criteria:

  • Current diagnosis of Crohn's disease (CD),abdominal/intrabdominal/perianal fistula and/or abscess, indeterminant colitis, IBD-unclassified, microscopic colitis, ischemic colitis, infectious colitis, radiation colitis, or active diverticular disease
  • Presence of an ostomy or ileoanal pouch
  • Current diagnosis or suspicion of primary sclerosing cholangitis

Medical History Exclusion Criteria:

  • Lack of peripheral venous access
  • Any major surgery within 6 weeks prior to screening or a major surgery planned during the study
  • History of alcohol, drug, or chemical abuse < 1 year prior to screening

Treatment and study plan

Afimkibart

Drug

Afimkibart will be administered as per the schedule defined in the protocol.

Other names: RO7790121, PF-06480605, RVT-3101

Caffeine

Drug

Caffeine will be administered orally as part of a CYP cocktail per the schedule defined in the protocol.

Warfarin

Drug

Warfarin will be administered orally as part of a CYP cocktail per the schedule defined in the protocol.

Omeprazole

Drug

Omeprazole will be administered orally as part of a CYP cocktail per the schedule defined in the protocol.

dextromethorphan

Drug

Dextromethorphan will be administered orally as part of a CYP cocktail per the schedule defined in the protocol.

midazolam

Drug

Midazolam will be administered orally as part of a CYP cocktail per the schedule defined in the protocol.

Vitamin K

Other

Vitamin K will be administered orally as a rescue medication following warfarin administration per the schedule outlined in the protocol.

Primary outcomes

  1. Area Under the Plasma Concentration-time Curve Up to Time t (AUC0-t [AUC last]) of CYP Probe Substrates (Midazolam, 1-OH-Midazolam, Omeprazole, 5-OH-Omeprazole, Dextromethorphan, Dextrorphan, R-Warfarin, S-Warfarin, Caffeine, and Paraxanthine)

    Time frame: Up to approximately 13 weeks

  2. Area Under the Plasma Concentration-time Curve Extrapolated to Infinity (AUCinf) of CYP Probe Substrates (Midazolam, 1-OH-Midazolam, Omeprazole, 5-OH-Omeprazole, Dextromethorphan, Dextrorphan, R-Warfarin, S-Warfarin, Caffeine, and Paraxanthine)

    Time frame: Up to approximately 13 weeks

  3. Maximum Plasma Concentration (Cmax) of CYP Probe Substrates (Midazolam, 1-OH-Midazolam, Omeprazole, 5-OH-Omeprazole, Dextromethorphan, Dextrorphan, R-Warfarin, S-Warfarin, Caffeine, and Paraxanthine)

    Time frame: Up to approximately 13 weeks

  4. Time to Maximum Concentration (Tmax) of CYP Probe Substrates (Midazolam, 1-OH-Midazolam, Omeprazole, 5-OH-Omeprazole, Dextromethorphan, Dextrorphan, R-Warfarin, S-Warfarin, Caffeine, and Paraxanthine)

    Time frame: Up to approximately 13 weeks

  5. Elimination Half-life (T1/2) of CYP Probe Substrates (Midazolam, 1-OH-Midazolam, Omeprazole, 5-OH-Omeprazole, Dextromethorphan, Dextrorphan, R-Warfarin, S-Warfarin, Caffeine, and Paraxanthine)

    Time frame: Up to approximately 13 weeks

  6. Metabolite-to-parent Area Under the Curve From Time 0 (AUC0-t) Ratio for CYP Probe Substrates (Midazolam and 1-OH-Midazolam, Omeprazole and 5-OH-Omeprazole, Dextromethorphan and Dextrorphan, and Caffeine and Paraxanthine)

    Time frame: Up to approximately 13 weeks

  7. Metabolite-to-parent Area Under the Concentration-time Curve from Time 0 to Infinity (AUC0-inf) Ratio for CYP Probe Substrates (Midazolam and 1-OH-Midazolam, Omeprazole and 5-OH-Omeprazole, Dextromethorphan and Dextrorphan, and Caffeine and Paraxanthine)

    Time frame: Up to approximately 13 weeks

  8. Metabolite-to-parent Concentration of CYP Probe Substrates (Midazolam and 1-OH-Midazolam, Omeprazole and 5-OH-Omeprazole, Dextromethorphan and Dextrorphan, and Caffeine and Paraxanthine)

    Time frame: Up to approximately 13 weeks

Secondary outcomes

  1. Percentage of Participants with Adverse Events (AEs)

    Time frame: Up to approximately 5 years

  2. Predose and Peak Serum Concentration of Afimkibart

    Time frame: Up to approximately 5 years

Study contacts

Contact information is provided by the study sponsor or research team.

Fastest response: use the inquiry form. https://www.gene.com/contact-us/submit-medical-inquiry

CONTACT

Reference Study ID Number : GA46438 https://forpatients.roche.com/ No attachments to email below.

CONTACT

[email protected]

888-662-6728 (U.S. Only)

Sponsors and collaborators

Lead sponsor

Hoffmann-La Roche

Industry

Registry information

Official study title

A Phase I, Multicenter, Open-Label, Single-Agent Study to Assess the Pharmacokinetics of Cytochrome P450 Substrates After Treatment With Afimkibart in Participants With Moderately to Severely Active Ulcerative Colitis

Important dates

Study start
2026
Primary completion
2027
Study completion
2030
First posted
Jun 24, 2026
Registry last updated
Jul 23, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

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This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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