Subgroup analysis of the included studies for GC.

<p>Note: AUC, area under the summary receiver operating characteristic curve; DOR, diagnostic odds ratio; RIA, radio-immunity assay; ELISA, enzyme-linked immunosorbent assay; CLIA, chemiluminescent immunoassay; L-TIA, latex-enhanced turbidimetric immunoassay; CI, confidence interval</p><p>Subgroup analysis of the included studies for GC.