Demonstration and Diagnostic Significance of Pro-Gastrin-Releasing Peptide in Medullary Thyroid Carcinoma

The expression of pro-gastrin-releasing peptide (proGRP) in medullary thyroid carcinoma (MTC) and other histological types of thyroid carcinoma was studied by an immunohistochemical technique, using polyclonal anti-proGRP antiserum. Immunoreactivity for proGRP was detected exclusively in MTC (n = 7); other histological types (n = 12) were all negative for proGRP. In addition, serum proGRP levels were elevated in patients with primary or recurrent MTC (n = 3), and they changed in parallel with serum calcitonin (CT), and carcinoembryonic antigen (CEA). These results show that proGRP, which is considered to be a specific marker for small-cell lung carcinoma, may be also a potential tumor marker for MTC, in addition to CT and CEA.

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