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A randomised trial of aminosalicylate withdrawal in patients with ulcerative colitis in established remission on combination treatment of azathioprine (or 6-mercaptopurine) and an aminosalicylate - CASA trial

A randomised trial of aminosalicylate withdrawal in patients with ulcerative colitis in established remission on combination treatment of azathioprine (or 6-mercaptopurine) and an aminosalicylate - CASA trial

Status
Active, not recruiting
Phases
Phase 4
Study type
Interventional
Source
EU CTR
Registry ID
EUCTR2005-000695-40-GB
Enrollment
420
Registered
2005-08-17
Start date
2005-09-27
Completion date
Unknown
Last updated
2019-06-30

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

The medical condition is Ulcerative Colitis.

Interventions

Product Name: products containing azathioprine or 6-mercaptopurine Pharmaceutical Form: Tablet INN or Proposed INN: azathioprine Concentration unit: mg

Sponsors

University of Nottingham
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: 1) Male and female patients aged between 18 and 75 years with ulcerative colitis. 2) Patients whose ulcerative colitis has been in clinical remission, defined as, being off steroids for 3 months or longer. 3) Patients taking both azathioprine (or 6 mercaptopurine) and an aminosalicylate. 4) Patients taking azathioprine (>50mg/day) OR 6-mercaptopurine (>25mg/day) at a stable dose for at least 8 weeks. 5) Patients taking an aminosalicylate at a stable dose (specified below) for at least 4 weeks: sulphasalazine >1.5g/day, Pentasa (slow release mesalazine) >750mg/day, Asacol (mesalazine)or generic equivalents >800mg/day, Colazide (balsalazide) >2.25g/day, Dipentum (olsalazine) >750mg/day 6) Patients on combined treatment with azathioprine (or 6-MP) and an aminosalicylate for a minimum of 6 months but no more than 4 years. Patients may enter if they have briefly been off either treatment during this time (eg because of abnormal blood test results) but prescription of each drug should cover at least 85% of the period of time for continuous drug treatment to be declared. NB Duration of aminosalicylate may be longer. 7) Patients who have given written informed consent. Are the trial subjects under 18? no Number of subjects for this age range: F.1.2 Adults (18-64 years) yes F.1.2.1 Number of subjects for this age range F.1.3 Elderly (>=65 years) yes F.1.3.1 Number of subjects for this age range

Exclusion criteria

Exclusion criteria: 1) Patients with Crohn’s disease. 2) Patients with a baseline Walmsley Simple Activity Index >2. 3) Patients with a baseline sigmoidoscopy grade of >2 (Baron Scale). 4) Patients requiring long term treatment with oral steroids for any medical condition. 5) Women who are pregnant or lactating. 6) Patients with known HIV infection. 7) Other serious medical or psychiatric illness currently ongoing, or experienced within the past three months, that in the opinion of the investigator would compromise the study. 8) Patients unable to comply with the protocol requirements, including severe alcohol and drug misuse or abuse

Design outcomes

Primary

MeasureTime frame
Main Objective: This study will help define the medical management for patients with difficult ulcerative colitis who have achieved remission on azathioprine (or 6-mercaptopurine) and on an aminosalicylate. It is important to determine whether, after the introduction of azathioprine with remission established, there is any extra benefit in continuing the aminosalicylate treatment;Secondary Objective: To identify factors predictive of the success of the different maintenance treatment regimes;Primary end point(s): Relapse of colitis, defined by symptoms and sigmoidoscopy findings.

Countries

United Kingdom

Outcome results

None listed

Source: EU CTR (via WHO ICTRP) · Data processed: Feb 4, 2026