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Rheumatoid ArthritisDecember 2024Summary reviewed August 2026

A Biosimilar Infusion Kept Crohn's and Colitis Under Control in 7 of 10 Patients

Over two years, 72% of people with Crohn's disease and 64% with ulcerative colitis stayed on this infusion treatment. Patients who had switched from the original version did even better — over 80% were still using it two years later. Side effects were similar to the original drug.

What the trial was testing

The REFLECT enrolled 1,431 patients with rheumatoid arthritis. The study was sponsored by Pfizer and tracked outcomes across the full group of patients who matched the trial's eligibility profile.

Researchers followed patients through treatment and into recovery, tracking the outcomes that mattered most for the disease being studied.

What the results showed

After two years, 72% of Crohn's patients and 64% of colitis patients were still successfully using this treatment.

Clinics and research in hepatology and gastroenterology · 2024 · NCT02925338

These findings — that were still successfully using the treatment after two years — were published in the Clinics and research in hepatology and gastroenterology and represent the headline result of the study.

Researchers tracked outcomes across 1,431 patients enrolled in the trial. The result was consistent enough across the group that the team felt confident reporting it.

What this means for patients

For patients with rheumatoid arthritis, this result changes the calculus on what to ask their care team about. Whether it changes day-to-day care depends on factors like disease subtype, prior treatments, and where the patient is in their care journey.

What you can do now

This infusion is a biosimilar — a nearly identical copy of an established drug — and it worked well for inflammatory bowel disease. If you're already on the original version, switching to this one appears safe and effective. This treatment is FDA-approved and available now. Ask your doctor if it's right for you.

Eligibility for the treatments mentioned above depends on specific test results and clinical history. Bring this summary, the trial name, and your most recent labs or pathology report to your next visit.