Abstract
Monoclonal antibodies directed against tumor necrosis factor (TNF)-α have markedly impacted the course of Crohn’s disease and ulcerative colitis. However, it was recognized early on that these complex compounds are also potentially immunogenic, prompting the host to develop an antibody response to these medications. Anti-drug antibodies can increase drug clearance or directly impact the TNF binding site. In addition, there can be significant heterogeneity regarding the host metabolism of these biologic therapies.
The use of measuring anti-TNF drug levels and antibodies generated against these medications to guide medical decision-making, also known as therapeutic drug monitoring (TDM), allows clinicians to potentially maximize the use of these therapies. Assays assessing these drug and antibody levels have been used extensively for infliximab and adalimumab and are most commonly performed when drug levels are at their nadir, as a trough level.
Historically, TDM assays for infliximab and adalimumab have been used in a reactive fashion, i.e., when an individual patient with inflammatory bowel disease has lost response or not responded, and several studies support this. More recent studies have also begun to examine the potential benefit of prospectively monitoring drug and antibody levels during induction and maintenance in patients who are clinically doing well, i.e., in a proactive fashion. Initial results of the application of these assays are promising though further research is required. Moreover, further research will be required to determine the applicability of such methods with newer biologic therapies as they become available.
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Scott, F.I., Osterman, M.T. (2018). Therapeutic Drug Monitoring of Biologic Agents. In: Cheifetz, A., Feuerstein, J. (eds) Treatment of Inflammatory Bowel Disease with Biologics . Springer, Cham. https://doi.org/10.1007/978-3-319-60276-9_8
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