Increased Serum CEA in a Patient with Advanced Small Cell Neuroendocrine Carcinoma

This case report describes a patient with liver metastases and a history of prostate cancer and colorectal cancer. Serum Carcinoembryonic Antigen (CEA) was strongly increased. A liver biopsy revealed a small cell neuroendocrine carcinoma instead of colorectal cancer, possibly originating from his prostate cancer. CEA staining indicated synthesis of CEA in the malignant cells.