This study is evaluating the initial safety and efficacy of local injections of E-CEL UVEC cells, which are genetically engineered (pro-survival gene, E4ORF1+), human umbilical vein endothelial cells, as an experimental treatment of patients with chronic anal fissure (CAF) who have failed medical therapy (i.e., topical vasodilators ± botulinum injection).
Experimental means that E-CEL UVEC is not approved by the U.S Food and Drug Adminstration.