Efficacy Study of Sargramostim in the Retreatment of Patients Who Have Crohn's Disease Who Have Previously Responded to Treatment With Sargramostim

Inclusion Criteria: * You must be 18 years or older. * You must have active Crohn's disease at the time of screening. * You must be 18 years or older. * You must have active Crohn's disease at the time of screening. * You must be able to give yourself an injection of study drug or have another person who can help you give the injection. * You must not be pregnant and agree to use birth control if you are a sexually active male or female of childbearing potential. Exclusion Criteria: * You may not be pregnant or breastfeeding. * You may not have a colostomy or ileostomy. * You may not be taking prohibited medications. * You may not have had GI surgery or a bowel obstruction in the last 6 months. * You may not have ever taken this drug or drugs of similar type in the past.