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Table 1 Eligibility criteria

From: Diagnostic value of serum HER2 levels in breast cancer: a systematic review and meta-analysis

Inclusion criteria Exclusion criteria
• human diagnostic studies reported the level of serum HER2 in breast cancer patients • Non-human subjects
• Studies confirmed the breast cancer using immunohistopathological examination • Conference abstracts
• Studies reported the sensitivity and specificity of serum HER2 level or comprised with data could to calculate the desiered parameters mentioned in data extraction section • Grey literature
• Comments
• Full text published papers • Letters
• English language • Reviews
• Case reports
• In vitro studies
• Ecological studies
• Duplicate publications
• Studies with insufficient data