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Eighty-four participants with dcSSc were randomized to receive abatacept or placebo for 12 months. RNA-Seq was performed on 233 skin paired biopsies at baseline and at 3 and 6 months. Improvement was defined as a 5-point or more than 20% change in modified Rodnan skin score (mRSS) between baseline and 12 months. Samples were assigned to intrinsic gene expression subsets (inflammatory, fibroproliferative, or normal-like subsets). In the abatacept arm, change in mRSS was most pronounced for the inflammatory and normal-like subsets relative to the placebo subset. Gene expression for participants on placebo remained in the original molecular subset, whereas inflammatory participants treated with abatacept had gene expression that moved toward the normal-like subset. The Costimulation of the CD28 Family Reactome Pathway decreased in patients who improved on abatacept and was specific to the inflammatory subset. Patients in the inflammatory subset had elevation of the Costimulation of the CD28 Family pathway at baseline relative to that of participants in the fibroproliferative and normal-like subsets. There was a correlation between improved\n                    <jats:italic>\u0394<\/jats:italic>\n                    mRSS and baseline expression of the Costimulation of the CD28 Family pathway. This study provides an example of precision medicine in systemic sclerosis clinical trials.\n                  <\/jats:p>","DOI":"10.1172\/jci.insight.155282","type":"journal-article","created":{"date-parts":[[2022,11,10]],"date-time":"2022-11-10T12:00:26Z","timestamp":1668081626000},"source":"Crossref","is-referenced-by-count":10,"title":["Machine-learning classification identifies patients with early systemic sclerosis as abatacept responders via CD28 pathway modulation"],"prefix":"10.1172","volume":"7","author":[{"given":"Bhaven K.","family":"Mehta","sequence":"first","affiliation":[{"name":"Department of Biomedical Data Science, Department of Molecular & Systems Biology, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Monica E.","family":"Espinoza","sequence":"additional","affiliation":[{"name":"Department of Biomedical Data Science, Department of Molecular & Systems Biology, Geisel School of 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