Inclusion Criteria

INCLUSION CRITERIA

Subjects selected for this study will be patients with Zollinger-Ellison syndrome who are
being evaluated under the protocol entitled "Diagnostic Evaluation of Patients with
Suspected Abnormalities of Gastric Secretion" (80-DK-0123).

Histologically proven gastrinoma;

Evidence of metastatic disease or locally invasive tumor by angiography, ultrasound,
computerized axial tomography, MRI scan or bone scan;

Progression of the tumor during the preceding 6 months.

EXCLUSION CRITERIA

The following pre-existing conditions will exclude patients from the study:

Congestive heart failure;

Proteinuria greater than 1 gram/day;

Serum creatinine greater than 1.5 mg%;

Platelet count less than 100,000/mm3;

White blood count less than 2500/mm3;

Pregnancy.