Prognostic value of preoperative circulating tumor DNA in non-small cell lung cancer: a systematic review and meta-analysis.

"Declarations Conflict of interestThe authors have no relevant financial or non-financial interests to disclose. Ethical approvalThis study does not require ethics approval. Consent to participateInformed consent was obtained from all individual participants included in the study. Conflict of interest The authors have no relevant financial or non-financial interests to disclose."

"Funding This work was supported by Anji Traditional Chinese Medical Hospital. Kai Zhang has received research support from Anji Traditional Chinese Medical Hospital."

"According to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines (Page et al. ), a systematic review of the literature and meta-analysis was conducted for patients with resected NSCLC to identify the respective relationships of preoperative ctDNA status with the survival outcomes, including relapse-free survival (RFS) and overall survival (OS). The present study is registered in the international prospective register of systematic reviews (PROSPERO 2022 CRD42022311615)."