Expression of SIRT1 and survivin correlates with poor prognosis in esophageal squamous cell carcinoma

This study assessed the association of sirtuin type 1 (SIRT1) and survivin expression with the clinicopathological features and survival of esophageal squamous cell carcinoma (ESCC) patients after concurrent chemoradiotherapy. SIRT1 and survivin proteins were immunohistochemically stained in 93 ESCC tissue specimens. SIRT1 was expressed in ESCC (80.6% vs 25.8% in normal mucosae) and survivin was expressed in 67.7% of ESCC vs 19.4% normal tissues (P < .01), and SIRT1 expression was associated with survivin expression (r = 0.39, P < .05). Furthermore, expression of both SIRT1 and survivin was associated with tumor size, depth of tumor invasion, tumor differentiation, lymph node metastasis, advanced clinical stage, and chemoradiotherapy (P < .05) as well as poor progression-free survival (PFS;P < .05) of ESCC patients after concurrent chemoradiotherapy (P < .05). Patient age, chemotherapy, tumor size, clinical stage, lymph node metastasis, and SIRT1 and survivin expression were independent PFS predictors (P < .05). Expression of both SIRT1 and survivin was associated with poor ESCC PFS.