RESUMO
CONTEXT: Beta Human Chorionic Gonadotropin (ßHCG), a marker of the trophoblastic neoplasm, is also secreted by non-trophoblastic neoplasms including gastric carcinomas. Its role in disease progression remains unclear. AIM: To investigate the incidence of ßHCG positivity in gastric carcinomas and correlate its presence with the biological behavior of the tumor. SETTING AND DESIGN: A hospital-based, immunohistochemical study. MATERIALS AND METHODS: One hundred and fifty formalin-fixed, paraffin-embedded tissue specimens from histopathologically confirmed cases of gastric carcinoma were immunostained using an indigenously developed antibody against ßHCG. Tumors with diffuse reactivity to ßHCG were considered as positive. Those with occasional, focal or no reactivity to ßHCG were considered as negative. STATISTICAL ANALYSIS: Differences in ßHCG staining were compared according to the histological grade and surgical stage using the χ(2) test. Using the Cox proportional hazards model, the time till the onset of development of an adverse outcome after surgery (defined as death, local or distant metastasis) was compared between the bHCG positive and negative tumors. RESULTS: Twenty-eight (18.7%) of the 150 specimens were ßHCG positive. No association was found between the histological grade (P=0.49) and the surgical stage (P=0.19) with ßHCG positivity. The median disease-free survival after surgery was not different among ßHCG positive and negative tumors. Risk of an adverse outcome after surgery was significantly associated with the stage of the tumor (Hazard ratio=2.9, 95% confidence interval: 1.1-7.4). No association was observed with grade or ßHCG positivity. CONCLUSION: ßHCG immunoreactivity was observed in about one-fifth of the gastric cancers. ßHCG reactivity, however, played no role in the biological behavior.
