• Production of CAP 1-6D T cells [ Designated as safety issue: No ]
  
• Production of cytotoxic T cells [ Designated as safety issue: Yes ]
  
• Antitumor response [ Designated as safety issue: No ]
  
• Frequency and severity of toxic effects [ Designated as safety issue: Yes ]
  

OBJECTIVES:

• Determine whether immunization with carcinoembryonic antigen (CEA) peptide 1-6D (CAP 1-6D) emulsified in Montanide ISA-51 adjuvant or dissolved in sargramostim (GM-CSF) can generate CAP 1-6D-specific T cells in patients with CEA-producing adenocarcinomas of gastrointestinal tract origin.
• Determine whether vaccination with CAP 1-6D can generate cytotoxic T cells against CEA-expressing tumors in these patients.
• Determine whether this vaccine can produce antitumor responses in these patients.
• Determine the frequency and severity of toxic effects associated with this vaccine in these patients.

OUTLINE: This is a randomized study. Patients are randomized to 1 of 2 treatment arms.

• Arm I: Patients receive carcinoembryonic antigen peptide 1-6D (CAP 1-6D) emulsified in Montanide ISA-51 adjuvant subcutaneously on day 1.
• Arm II: Patients receive CAP 1-6D dissolved in sargramostim (GM-CSF) intradermally on day 1.

Treatment repeats in both arms every 3 weeks for 6 courses in the absence of disease progression or unacceptable toxicity.

Patients are followed at 3 weeks and then as necessary.

PROJECTED ACCRUAL: A total of 10-36 patients (5-18 per arm) will be accrued for this study within 36 months.