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Carbohydrate antigen 19‐9‐producing gastric carcinoma: A case report

Carbohydrate antigen 19‐9 (CA 19‐9) is a tumor marker often elevated in pancreatic and hepatobiliary malignancies. CA 19‐9 has also been rarely reported to be a marker of digestive tract malignancies. We report a case of CA 19‐9‐producing gastric cancer with a markedly high serum CA 19‐9 level (52 862 U/mL). Immunohistochemical staining of the biopsy specimen was positive for CA 19‐9. Patient received palliative chemotherapy but expired due to disease progression. Elevated CA 19‐9 in gastric cancer is relatively rare and is correlated with poor prognosis.