Clinical Implications of Alpha-Fetoprotein Expression in Gastric Adenocarcinoma

Background: Alpha-fetoprotein (AFP)-producing gastric adenocarcinoma has an extremely poor prognosis. Few cases have been reported in Germany until now. Here we report on a patient with an AFP-producing gastric cancer and a subsequent analysis of AFP expression in a more extended series of gastric cancer patients. Material and Methods: A 62-year-old man was referred to our hospital with suspected gastric cancer. Gastroscopy, ultrasound, and CT scans of the abdomen showed a gastric tumour. Serological and histopathological investigations led to the diagnosis of a poorly differentiated adenocarcinoma expressing AFP. Following diagnosis, a short-term response was achieved by palliative chemotherapy. Expression of AFP and albumin was then investigated on an extended series of 25 patients with gastric cancer and four gastric cancer cell lines using immunohistochemistry and RT-PCR. No patient had suffered from hepatocellular carcinoma or germ cell tumor. Results: Using paraffin-embedded gastric cancer specimens, we found AFP immunohistochemically in 2 of 25 (8%) patients. AFP-mRNA was expressed in 3 (12%) patients and a single gastric cancer cell line (AGS). Albumin-mRNA was not found in any gastric cancer sample or gastric cancer cell line. Conclusions: Our study shows that AFP-producing gastric adenocarcinomas are an important clinical entity with a frequency that has been underestimated in the past. In the absence of a primary liver tumor, clinicians have to consider a primary gastric cancer, which has a poor prognosis, and merits a more aggressive therapy.

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