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• W2888215431 abstract "We concur with the response (commentary) from Pang et al that in most cases therapeutic drug-disease interactions (TP-DDIs) caused by inflammation are not of clinical concern. Indeed, recent data suggest that inflammatory disease states with mild inflammation, such as multiple sclerosis1 and psoriasis,2 do not cause meaningful TP-DDIs involving cytochrome P450 (CYP) substrates. We also concur that once a lack of drug interaction is robustly demonstrated in a particular disease state (eg, psoriasis), there is no need to conduct additional TP-DDI studies in that disease state. There are only a few inflammatory disease states wherein drug monitoring would be advised, and then primarily when coadministering CYP-sensitive index substrates with a narrow therapeutic index. For instance, there are clinical data that suggest moderate to severe rheumatoid arthritis3, 4 and Crohn disease5 can cause a ≥ 2-fold change in the clearance and exposure of CYP3A-sensitive substrates. The comment was made in the Letter to the Editor that “… most of the disease-mediated TP-DDIs due to normalization/suppression of proinflammatory cytokines have shown only mild to moderate effects on drug exposures and have rarely led to dose adjustment for the victim drug.” This statement is true if considering patients with only minor systemic inflammation. Psoriasis, hepatitis C, and congestive heart failure are all diseases with negligible to mild effects on CYP-mediated clearance. The magnitude of TP-DI is related to both severity and type of inflammatory disease. Thus, an assessment of TP-DDI potential in patients with rheumatoid arthritis with mild systemic inflammation is expected to give an attenuated response compared to an assessment in patients with moderate to severe rheumatoid arthritis. The authors therefore recommend that 2 or more markers of inflammation (such as interleukin-6, C-reactive protein, albumin, α1-acid glycoprotein) be measured at the beginning and end of any inflammatory TP-DDI trial. In instances where only a mild effect on CYP-mediated clearance was observed by a cytokine modulator, some of these TP-DDI trials either lacked an assessment of inflammatory markers or the markers suggested that patients with moderate to severe disease progression were not part of the trial. Assessments of TP-DDI potential should be done in the most sensitive population with sensitive CYP substrates; it is not surprising that a lack of inflammatory effects on CYP-mediated drug clearance is observed when drug interaction trials are conducted in healthy subjects or in patients with only mild disease progression. Another comment in the Letter to the Editor was that “… small-molecule drugs have the same potential to cause drug interactions if they reduce cytokine levels via disease modification, yet such assessments for small-molecule drugs are neither performed nor required by regulatory guidelines, indicating the lack of necessity or clinical relevance of such evaluations.” We concur that small-molecule drugs have the same potential as TPs to cause indirect drug interactions through effective treatment of certain diseases with moderate to severe inflammation. This is evidenced in our article6 wherein there are several clinical examples that show that inflammatory diseases, irrespective of TP or small-molecule drug treatment, can cause mild to moderate changes in CYP-mediated clearance. We posit that inflammatory diseases themselves can cause indirect changes in CYP-mediated drug clearance, and that it is not TP-DDIs per se, but rather indirect DDIs with either small molecules or TPs that are worth evaluation. Figure 1 illustrates our proposed flow scheme for the evaluation of drug interactions caused by indirect or direct cytokine modulation." @default.
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• W2888215431 date "2018-08-21" @default.
• W2888215431 modified "2023-09-26" @default.
• W2888215431 title "Drug Interaction Involving Direct or Indirect Cytokine Modulation Should Be Investigated in Select Circumstances" @default.
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• W2888215431 doi "https://doi.org/10.1002/jcph.1303" @default.
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