Study to Assess Efficacy and Safety of Cx601, Adult Allogeneic Expanded Adipose-derived Stem Cells (eASC) for the Treatment of Complex Perianal Fistula(s) in Participants With Crohn's Disease (CD)

Inclusion criteria

• ✓. Signed informed consent.
• ✓. Participants of either gender greater than or equal to (\>=) 18 years and less than or equal to (\<=) 75 years of age.
• ✓. Participants with CD diagnosed at least 6 months prior to Screening visit in accordance with accepted clinical, endoscopic, histological and/or radiological criteria.
• ✓. Presence of complex perianal fistula(s) with a maximum of 2 internal openings and a maximum of 3 external openings based on clinical assessment; a central reading of a locally performed contrast enhanced (gadolinium) pelvic MRI will be performed to confirm location of the fistula and potential associated perianal abscess(es). Fistula(s) must have been draining for at least 6 weeks prior to Screening visit. Actively draining simple subcutaneous fistula(s), at the time of Screening visit, are not allowed in this study. A complex perianal fistula is defined as a fistula that meets one or more of the following criteria :
• ✓. Clinically controlled, nonactive or mildly active CD, during the last six months prior to Screening visit with:
• ✓. Participants whose perianal fistulas were previously treated and have shown an inadequate response or a loss of response while they were receiving either an immunosuppressive agent or tumour necrosis factor (TNF)-alpha antagonist or vedolizumab or ustekinumab, or having documented intolerance to any of these treatments administered at least at approved or recommended doses during the minimum period mentioned:
• ✓. Women of childbearing potential (WCBP) must have negative serum pregnancy test at screening (sensitive to 25 international units \[IU\] human chorionic gonadotropin \[hCG\]). Both WCBP or male participants participating in this study, with a WCBP as partner, must agree to use an adequate method of contraception during the entire duration of the study. An adequate method of contraception is defined as complete, non-periodic sexual abstinence (refraining from heterosexual intercourse), single-barrier method, vasectomy, adequate hormonal contraception (to have started at least 7 days prior to Screening visit), or an intra-uterine device (to have been in place for at least 2 months prior to Screening visit).