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Objectives:   To observe sex determining region Y-box 11 ( SOX11) gene expression in cutaneous malignant melanoma and its effect on tumour cell proliferation.Methods:   Clinicopathological data and tissue samples from patients with cutaneous malignant melanoma, together with tissue samples from healthy volunteers (controls), were retrospectively reviewed. Protein levels of SOX11 and the antigen identified by monoclonal antibody Ki-67 (Ki-67) in skin lesions were analysed using immunohistochemistry. The correlation between protein levels and clinipathological parameters was investigated.Results:   Out of 40 patient samples, 25 (62.5%) were positive for SOX11 protein in malignant melanoma tissue. This was significantly higher than in 40 control tissue samples, in which no SOX11 protein was detected. Presence of SOX11 protein was positively related to the proliferation index of cutaneous malignant melanoma tumour cells. Presence of SOX11 protein in cutaneous malignant melanoma was related to tumour type, tumour location, lymph node metastasis and 5-year survival rate.Conclusion:   Human cutaneous malignant melanoma tissues expressed high levels of SOX11 compared with healthy controls, suggesting that SOX11 may be a new prognostic marker for malignant melanoma.

Increased expression of sex determining region Y-box 11 (SOX11) in cutaneous malignant melanoma