A Study of SL-325 in Crohn's Disease Patients

Key Inclusion Criteria: * A diagnosis of Crohn's disease confirmed by endoscopy and histopathology ≥ 3 months prior to Screening * Moderately to severely active CD as defined by CDAI of ≥ 220 and ≤ 450 * SES-CD score ≥ 6 if ileocolonic or colonic disease, or ≥ 4 if isolated ileal disease, as assessed by central review * Demonstrated inadequate response, loss of response, or intolerance to one or more of the following Crohn's disease treatments: corticosteroids, immunomodulators, or an approved anti-tumor necrosis factor (TNF), anti-integrin, anti-interleukin (IL)-12/23, anti-interleukin (IL)-23p19, or Janus kinase inhibitor (JAK) Key Exclusion Criteria: * Diagnosis of UC, indeterminate colitis, or any other gastrointestinal condition that could undermine the diagnosis of CD * CD isolated to the stomach, duodenum, jejunum, or perianal region, without colonic and/or ileal involvement * Presence or suspicion of any of the following CD complications: intra-abdominal or perianal abscess; symptomatic stricture or colonic stenosis not passable in ileocolonoscopy, fistula, except for perianal fistula; active toxic megacolon or fulminant colitis; short bowel syndrome * Surgical bowel resection within 3 months before Screening, ≥ 3 bowel resections, or previous ileo-colonic resection of \> 2 segments * Diagnosis of primary sclerosing cholangitis * Has a stoma, ileostomy, or colostomy. * Has prior or current gastrointestinal dysplasia, other than a completely removed low-grade dysplastic lesion. * Has active tuberculosis (TB) or inadequately treated latent tuberculosis (LTBI) * Prior exposure to any anti-DR3 or anti-TL1A agent or agent with an anti-DR3 or anti-TL1A component