Nagao isoenzyme is associated with which cancer?

• A. Adenocarcinoma
• B. Lung cancer
• C. Gastrointestinal
• D. Hepatocellular carcinoma

Answer: (A)

The main concept here is that certain enzyme isoforms act as tissue- or histology-specific tumor markers. The Nagao isoenzyme has been described in association with adenocarcinomas, which are cancers arising from glandular epithelium. Because adenocarcinoma is the glandular-type cancer linked to this particular isoenzyme, it is the best fit among the options. Other cancers, like hepatocellular carcinoma, are typically associated with different markers, and lung or gastrointestinal cancers encompass broader histologies beyond this specific isoenzyme association.