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It has been shown that biological differences (e.g. genetic, epigenetic, microbial, environmental) exist between patients with IBD. It is also known that there is important heterogeneity in the response to therapies that target very specific biological pathways (e.g. TNF\u2010alpha signaling, IL\u201023R signaling, immune cell trafficking). The aim of this study was to identify potential biological differences associated with differential treatment response to the anti \u03b14\u03b27 integrin therapy known as vedolizumab. We performed targeted analyses of &gt;\u2009150 proteins and metabolites, and nontargeted analyses of &gt;\u20091100 lipid entities in serum samples from 92 IBD patients (42 CD, 50 UC) immediately prior to initiation of therapy with vedolizumab (baseline samples) and at their first clinical assessment (week 14 samples). We detected that the baseline levels of multiple serum cytokines, amino acids, acylcarnitines and triglycerides were different between responders and nonresponders to treatment with vedolizumab. We also noted changes in serum analytes between baseline and week 14 samples that were different between these two groups of patients. Many of these serum analytes are markers of biological pathways that are involved in the activation, proliferation and metabolism of pro\u2010inflammatory cells. This study provides support for the hypothesis that biological differences between individuals not only impact the risk to develop IBD and IBD\u2010related clinical phenotypes but also an IBD patient's likelihood of responding to a biological therapy.<\/jats:p>","DOI":"10.1111\/imcb.70039","type":"journal-article","created":{"date-parts":[[2025,6,13]],"date-time":"2025-06-13T01:54:46Z","timestamp":1749779686000},"page":"648-663","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Serum proteomic and metabolomic analyses from patients with\n                    <scp>IBD<\/scp>\n                    identify biological pathways associated with treatment success with anti\u2010integrin therapy"],"prefix":"10.1111","volume":"103","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7560-8326","authenticated-orcid":false,"given":"John D","family":"Rioux","sequence":"first","affiliation":[{"name":"Montreal Heart Institute 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