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Objective:To detect the expressions of FEZ1 and Survivin in small cell lung cancer (SCLC) and poorly differentiated squamous cell carcinoma (PDSCC),and to approach a theoretical basis for clinical diagnosis and treatment.Methods:Immunohistochemical and flow cytometry method were used to detect the expressions of FEZ1 and Survivin.Apoptosis ratio and cell proliferation index in normal lung tissue,SCLC and POSCC were analyzed.Results:The expressions of FEZ1 and Survivin were significantly different between SCLC and PDSCC (P＜0.05).The apoptosis ratio and proliferation index of normal lung tissue were lower than those of PDSCC and SCLC,with a significant difference (P＜0.05).Conclusion:The expressions of FEZ1 and Survivin are significantly different between SCLC and PDSCC,indicating that detecting the expressions of the two indexes may be helpful for clinical diagnosis.