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Expressions and clinical significances of TK1 and Ki-67 in triple negative breast cancer
Niu Yuchao*, Yao Yuan, Ma Xuezhen
Journal of International Oncology 2016, 43 (6): 409-413. DOI:10.3760/cma.j.issn.1673-422X.2016.06.003
Objective To analyze the expressions of thymidine kinase 1 (TK1) and nuclearassociated antigen Ki-67 in triple negative breast cancer (TNBC) and their clinical significances. MethodsOne hundred and twenty tumor tissue sections of patients with breast cancer who were performed breast conservation treatment or modified mastectomy in the Second Affiliated Hospital of Qingdao University Medical College from June 2009 to December 2010 were collected, and there were 60 cases with TNBC and 60 cases with nonTNBC. The expressions of TK1 and Ki-67 in different breast tissues were detected by immunohistochemistry. The relationships between the expression status and clinicopathologic features were analyzed. ResultsThe positive expression rates of TK1 in TNBC and nonTNBC were 83.33% and 51.67% respectively, with a significant difference (χ2=13.713, P=0.000). The positive expression rates of Ki67 expression in TNBC and nonTNBC were 68.33% and 31.67% respectively, with a significant difference (χ2=16.133, P=0.000). In TNBC, the expression of TK1 was related to histological staging (χ2=6.125, P=0.013), but it was not related to onset age (χ2=0.809, P=0.369), menopausal stutas (χ2=1.615, P=0.204), tumor size (χ2=0.054, P=0.816) and lymphatic metastasis (χ2=0.672, P=0.412). In TNBC, the expression of Ki67 was related to histological staging (χ2=13.145, P=0.000) and lymphatic metastasis (χ2=6.182, P=0.013), but it was not related to menopausal stutas (χ2=1.018, P=0.313), onset age (χ2=2.377, P=0.123) and tumor size (χ2=2.401, P=0.121). The expression of TK1 was positively correlated with that of Ki67 (r=0.369, P=0.023). The results of survival analysis showed that the diseasefree survival rates of 5year were 28.20% and 66.70% in the TK1 positive group and TK1 negative group, and the diseasefree survival rates of 5year were 24.30% and 64.30% in the Ki-67 positive group and Ki-67 negative group, with significant differences (χ2=4.194, P=0.041; χ2=4.540, P=0.033). ConclusionTK1 and Ki-67 are highly expressed in TNBC, and their expressions are correlated with histological staging and survival, which are expected to become prognostic indicators.
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