Clinical efficacy of infliximab level and anti-infliximab antibody measurement in patients with inflammatory bowel disease: An audit

Therapeutic drug monitoring in inflammatory bowel disease: A practical approach

The global burden of inflammatory bowel diseases (IBD) is estimated at 4.9 million and the global prevalence exceeds 0.3%. Multiple newer therapeutic agents have broadened the options for the therapy of IBD in the last three decades. Thiopurines, however, have retained their place as maintenance therapy in IBD, especially in resource-constrained setting. But thiopurines have narrow therapeutic range, often needing discontinuation due to side effects or lack of efficacy. Biologic agents revolutionized the treatment of IBD, but the efficacy is lost in 50% of patient after one year. These outcomes are often due to inadequate drug concentrations that may lead to the development of antibodies as well as pharmacodynamic failure. Therapeutic drug monitoring (TDM) was proposed to reduce loss of response and to optimize the therapy in patients on thiopurine and biologic therapy. TDM is based on exposure-response relationship, suggesting a positive correlation between elevated serum anti-TNF concentrations and favorable therapeutic outcomes. TDM has multiple facets. This article discusses the benefits, evidence and limitations of TDM. The practical use of TDM in clinical practice is highlighted. Newer developments in the field and their relevance in practice are discussed.

The efficacy and safety of TNF inhibitor (golimumab) as salvage treatment in patients with refractory noninfectious uveitis

BACKGROUND

Tumor necrosis factor inhibitor (TNFi) is recently reported to treat noninfectious uveitis (NIU) effectively. However, as a new kind of TNFi, golimumab is just on the market in China for several years, and its administration for NIU treatment lacks sufficient evidence. Therefore, the current study aimed to investigate the efficacy and safety of golimumab in refractory NIU patients.

METHODS

Thirty NIU patients with 49 affected eyes refractory to conventional treatments (corticosteroids and immunosuppressive agents) were consecutively enrolled. They received treatment of TNFi (50 mg golimumab every 4 weeks) for at least 6 months. The anterior chamber cell grade, vitreous haziness grade, central macular thickness, and visual acuity were evaluated at baseline, month (M) 1, M3, and M6.

RESULTS

After treatment, the anterior chamber cell grade declined from baseline (0.6 ± 0.7) to M6 (0.3 ± 0.5) (P < 0.001); the vitreous haziness grade decreased from baseline (1.2 ± 1.2) to M6 (0.4 ± 0.5) (P < 0.001); meanwhile, the central macular thickness also reduced from baseline (351.4 ± 90.8 μm) to M6 (271.8 ± 54.4 μm) (P < 0.001). In terms of visual acuity (LogMAR), it showed a declined trend from baseline (0.5 ± 0.3) to M6 (0.4 ± 0.2), but without statistical significance (P = 0.096). Subgroup analyses revealed that TNFi history related to decreased golimumab efficacy. In addition, 13.3% of patients had adverse events, including elevated liver enzymes (6.7%), fatigue (3.3%), and rash (3.3%).

CONCLUSION

Golimumab is effective and safe for refractory NIU treatment, while a large-scale trial is still needed for verification.