PET with Zirconium Zr 89 Trastuzumab in Detecting Tumors in Patients with HER2 Positive Esophagogastric Cancer

Inclusion Criteria

• Registered patient at Memorial Sloan-Kettering Cancer Center (MSKCC)
• Pathologically or cytologically confirmed metastatic or primary esophagogastric cancer; HER2 positive status by fluorescence in situ hybridization (FISH) or immunohistochemistry (IHC) as currently being implemented for patients with esophagogastric cancer; HER2 overexpression and/or amplification as determined by IHC (3+) or FISH (>= 2.0)
• Measurable or evaluable disease, lesions that have not been previously radiated, with clinically indicated imaging evaluation performed within 4 weeks prior to study entry (computed tomography [CT], magnetic resonance imaging [MRI], fluorodeoxyglucose [FDG]-PET or bone scan); patients requiring concurrent radiation treatment are not eligible unless additional lesions that are not being irradiated and are assessable for targeting are present
• Karnofsky performance score >= 60
• Ability to understand and willingness to sign informed consent
• Negative pregnancy test, to be performed on female patients of childbearing potential within 1 week before administration of radioactive material
• Life expectancy of at least three (3) months
• Willingness to use birth control while on study
• The patients will be asked to consent to provide access to data obtained from molecular analysis that has been done on archived tumor tissue that will be correlated with 89Zr-DFO-trastuzumab imaging results
• Concurrent therapy will be allowed

Exclusion Criteria

• Inability to lie still for the duration of the scanning procedure
• Patients with known sensitivity or contraindication to any of the component of 89Zr-DFO-trastuzumab (89Zr or desferrioxamine [DFO] or trastuzumab)
• Patients who have received trastuzumab must have at least a washout period for trastuzumab of 14 days, this will not apply to 89Zr-DFO-trastuzumab repeat, post treatment assessment where patients may be receiving trastuzumab
• Human immunodeficiency virus (HIV) positive or active hepatitis
• History or presence of clinically relevant cardiovascular abnormalities such as uncontrolled hypertension, congestive heart failure New York Heart Association (NYHA) classification of 3, unstable angina or poorly controlled arrhythmia, myocardial infarction within 6 months prior to study entry
• Platelets < 50 K/mcL
• Absolute neutrophil count (ANC) < 1.0 K/mcL
• Bilirubin > 2 x institutional upper limits of normal (ULN), with exception of patients with Gilberts disease
• Aspartate aminotransferase (AST)/alanine aminotransferase (ALT) > 2.5 x ULN (institutional upper limits of normal); > 5 x ULN if liver metastasis
• Estimated glomerular filtration rate (eGFR) < 30 mL/min/1.73m^2