3Muhammad U J, Jason E, Elijah SM, et ak Prognostic factors for sur- vival in patients with epithelioid sarcoma." 441 cases from the SEER database[J]. Clin Orthop Relat Res, 2009, 467(11): 2939-2948.
4Whitworth PW, Pollock RE, Mansfield PF, et al. Extremity ep- ithelioid sarcoma. Amputation vs local resection[J]. Arch Surg, 1991, 126(12): 1485-1489.