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Gastrointestinal metastasis to the breast
Atul K Madan1, Craig Ternovits, Samantha A Huber
1Department of Surgery, Tulane University School of Medicine, and Department of Pathology, Louisiana State University Medical Center, New Orleans, LA 70112, USA.
Surgery
|December 5, 2002
Summary
Metastatic gastrointestinal carcinoma to the breast is rare but can be misdiagnosed. Immunohistochemistry for carcinoembryonic antigen and cytokeratin 20 aids in distinguishing it from primary breast cancer.
Area of Science:
- Oncology
- Pathology
- Gastroenterology
Background:
- Primary breast cancer is common, but metastatic disease to the breast, particularly from gastrointestinal cancers, is rare.
- Routine histopathology can be misleading in diagnosing the origin of breast masses.
Observation:
- Histochemical analysis was performed to differentiate between primary breast cancer and gastrointestinal carcinoma metastatic to the breast.
- Specific markers analyzed included Her-2/NEU, GCDFP-15, ER, PR, CEA, CK7, and CK20.
Findings:
- Positive staining for carcinoembryonic antigen (CEA) and cytokeratin 20 (CK20) strongly suggested gastrointestinal carcinoma metastatic to the breast.
- Negative staining for breast cancer antigens further supported this diagnosis.
Implications:
- Accurate diagnosis is crucial as treatment and prognosis differ significantly between primary breast cancer and metastatic disease.
- Immunohistochemistry, especially for CEA and CK20, is vital for correct diagnosis.
- Metastatic gastrointestinal carcinoma should be considered in the differential diagnosis of breast masses, particularly in patients with a history of gastrointestinal cancer.