Cerebrospinal fluid and serum carcinoembryonic antigen in brain tumors.

Carcinoembryonic antigen (CEA) has been indicated to be a marker for brain tumors. In this study CEA was measured in serum and cerebrospinal fluid (CSF) of 14 patients with benign brain lesions, 16 with primary brain tumors and 8 with metastatic brain tumors by radioimmuno assay. Tumor cyst fluid CEA of 6 patients having intracranial tumors was also measured. The control group (n=20) had no neurological disease. The mean CEA levels in CSF for the control group, patients with benign tumors, primary tumors and metastatic tumors were 0.22 ng/ml, 0.31 ng/ml, 0.92 ng/ml, and 6.3 ng/ml respectively. Corresponding serum CEA levels were 2.5, 2.7, 3.0 and 5.2 ng/ml. Results showed that CEA level in CSF may play an important role in differential diagnosis of primary and metastatic brain tumors and consequently management of the treatment. To our knowledge this is the first such study on brain tumors from India.