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- [10] Clinical significance of matrix metalloproteinase-9 expression in esophageal squamous cell carcinoma[J]. Zhen-Dong Gu, Ke-Neng Chen, Department of Thoracic Surgery, Peking University School of Oncology, Beijing Cancer Hospital, Beijing 100036, China Ming Li, Jin Gu, Department of General Surgery, Peking University School of Oncology, Beijing Cancer Hospital, Beijing 100036, China Ji-You Li, Department of Pathology, Peking University School of Oncology, Beijing Cancer Hospital, Beijing 100036, Ch