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To evaluate the methodological quality of systematic reviews (SRs) or meta-analysis of trastuzumab-based therapy for breast cancer. We searched the PubMed, EMBASE, Web of science, Cochrane library, international prospective register of systematic reviews, Chinese BioMedical Literature Database, Wan Fang, China National Knowledge Infrastructure and VIP database for SRs or meta-analysis. The methodological quality of included literatures was appraised by risk of bias in systematic review (ROBIS) tool. Twenty three eligible systematic reviews or meta-analysis