Relationship Between Combined Histologic and Endoscopic Endpoints and Efficacy of Ustekinumab Treatment in Patients With Ulcerative Colitis.

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Ustekinumab induces and maintains histologic improvement in patients with ulcerative colitis (UC). The clinical relevance of this endpoint alone, and in combination with endoscopic improvement, is unknown.Histologic disease activity were evaluated in 2630 colonic biopsy samples from patients with UC treated in the UNIFI phase 3 UC clinical studies of ustekinumab. We evaluated associations between histologic improvement (defined as the composite of neutrophil infiltration in less than 5% of crypts and no crypt destruction, erosions, ulcerations, or granulation tissue) and clinical endpoints at the end of induction (week 8 and 16) and maintenance (week 44) periods. We assessed the validity of a combined histologic and endoscopic (Mayo endoscopy subscore, 0 or 1) improvement endpoint which we called histo-endoscopic mucosal healing (or histo-endoscopic mucosal improvement).Histologic improvement was significantly (P

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