Surgical resection margin for T3-T4 primary acral melanoma: a multicenter retrospective cohort study.

"Declarations Competing interestsThe authors declare no competing interests. Ethics approval and consent to participateThis study was approved by the Ethics Committee of FUSCC, Minhang Branch of FUSCC and Shanghai Electric Power Hospital. Each participant signed an informed consent document during the preoperative conversation. Consent for publicationNot applicable. Conflict of interestThe authors declare that they have no competing interests. Competing interests The authors declare no competing interests. Conflict of interest The authors declare that they have no competing interests."

"Funding This work was financially supported by the Lingang Laboratory (Grant No. LG-QS-202205-11); the National Natural Science Foundation of China (Grant No. 82272857); and the Shanghai Committee of Science and Technology, China (Grant No. 19411951700)."