Difficulty enrolling subjects

Pilot study using [18F]ISO-1 PET/CT to image sigma-2 receptor binding in metastatic breast cancer. Correlate baseline uptake and change in uptake after therapy with time to progression and standard and experimental pathology assays of biopsy or surgical tissue. The target population is up to 30 adult patients at least 18 years, with at least one site of disease outside the liver by at least one type of standard imaging.

Inclusion Criteria:

• At least 18 years of age
• Biopsy proven or clinically documented metastatic breast cancer with at least one lesion outside the liver by standard imaging (e.g. CT, MRI, Bone Scan, Ultrasound, FDG PET/CT)
• Plan to start new systemic therapy for metastatic disease.
• Participants must be informed of the investigational nature of this study and be willing to provide written informed consent and participate in this study in accordance with institutional and federal guidelines prior to study-specific procedures.

Exclusion Criteria:

• Females who are pregnant at the time of screening will not be eligible for this study, urine or serum pregnancy test will be performed in women of child-bearing potential at the time of screening.
• Inability to tolerate imaging procedure in the opinion of an investigator or treating physician.
• Serious or unstable medical or psychological conditions that, in the opinion of the investigator, would compromise the subject's safety or successful participation in the study.

Metastatic Breast Cancer