ABSTRACT
Background
The prognostic significance of cyclin A2 overexpression in non-small cell lung cancer (NSCLC) is controversial.
Methods
To understand the effect of cyclin A2 on recurrence in NSCLC, we retrospectively analyzed the expression of Bcl-2, cyclin A2, E-cadherin, Ki-67, and p53 using immunohistochemistry in 635 NSCLCs.
Results
Overexpression of cyclin A2 was found in 466 (73 %) of 635 NSCLCs, and recurrence occurred in 291 (46 %) of 635 NSCLCs with a median follow-up of 5.4 years. The relationship between recurrence and cyclin A2 overexpression was not homogenous by pathologic stage (Breslow–Day test for homogeneity, P = 0.007). Overexpression of cyclin A2 was associated with poor recurrence-free survival (RFS) in 374 stage I NSCLCs (P = 0.02), and RFS was worse in patient with negative expression of Bcl-2 than those with positive expression of Bcl-2. Cox proportional hazard analysis showed that stage I NSCLC patients with overexpression of cyclin A2 and negative expression of Bcl-2 had poorer RFS (hazard ratio = 3.86, 95 % confidence interval = 1.07–15.77; P = 0.03) than those with normal expression of cyclin A2 and Bcl-2, after adjusting for age, adjuvant radiotherapy, and histology. Neural network and generalized linear model including cyclin A2 and Bcl-2 showed best performance in the prediction of recurrence; error rates for neural network and generalized linear model were 15 % and 12 %, respectively.
Conclusions
Negative effect of cyclin A2 on RFS in stage I NSCLC was aggravated by negative expression of Bcl-2.




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ACKNOWLEDGMENT
The authors wish to thank Eun-Kyung Kim and Jin-Hee Lee for data collection and management, and Hoon Suh and Seo Kyu Park for sample collection. This work was supported by grants from the Korea Healthcare technology R & D project, Ministry of Health & Welfare (A101148), and the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2011-0029138), Republic of Korea.
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Ko, E., Kim, Y., Cho, E.Y. et al. Synergistic Effect of Bcl-2 and Cyclin A2 on Adverse Recurrence-Free Survival in Stage I Non-small Cell Lung Cancer. Ann Surg Oncol 20, 1005–1012 (2013). https://doi.org/10.1245/s10434-012-2727-2
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DOI: https://doi.org/10.1245/s10434-012-2727-2