Perimembrane Aurora-A expression is a significant prognostic factor in correlation with proliferative activity in non-small-cell lung cancer (NSCLC)

Eiji Ogawa, Kazumasa Takenaka, Hiromichi Katakura, Masashi Adachi, Yosuke Otake, Yoshinobu Toda, Hirokazu Kotani, Toshiaki Manabe, Hiromi Wada, Fumihiro Tanaka, Eiji Ogawa, Kazumasa Takenaka, Hiromichi Katakura, Masashi Adachi, Yosuke Otake, Yoshinobu Toda, Hirokazu Kotani, Toshiaki Manabe, Hiromi Wada, Fumihiro Tanaka

Abstract

Purpose: Aurora-A, also known as STK15/BTAK, is a member of the protein serine/threonine kinase family, and experimental studies have revealed that Aurora-A plays critical roles in cell mitosis and in carcinogenesis. However, no clinical studies on Aurora-A expression in non-small-cell lung cancer (NSCLC) have been reported. Thus, the present study was conducted to assess the clinical significance of Aurora-A status.

Experimental design: A total of 189 consecutive patients with resected pathologic (p-)stage I-IIIA, NSCLC were retrospectively reviewed, and immunohistochemical staining was used to detect Aurora-A expression.

Results: Aurora-A expression was negative in 31 patients (16.4%); among Aurora-A positive patients, 124 patients showed pure diffuse cytoplasmic Aurora-A expression and the other 34 patients showed perimembrane Aurora-A expression. Perimembrane Aurora-A tumors showed the highest proliferative index (PI) (mean PIs for negative, diffuse cytoplasmic, and perimembrane tumors: 49.2, 41.7, and 63.5, respectively; P < .001). Five-year survival rates of Aurora-A negative, diffuse cytoplasmic, and perimembrane patients were 67.8%, 66.7%, and 47.6%, respectively, showing the poorest postoperative survival in perimembrane patients (P = .033). Subset analyses revealed that perimembrane Aurora-A expression was a significant factor to predict a poor prognosis in squamous cell carcinoma patients, not in adenocarcinoma patients. A multivariate analysis confirmed that perimembrane Aurora-A expression was an independent and significant factor to predict a poor prognosis.

Conclusions: Perimembrane Aurora-A status was a significant factor to predict a poor prognosis in correlation with enhanced proliferative activity in NSCLC.

Figures

Fig. 1.
Fig. 1.
Aurora-A expression in non-small-cell carcinoma (NSCLC) as detected with imuunohistochemical staining. A Negative staining. B diffuse cytoplasmic staining. C Peri-membrane staining.
Fig. 2.
Fig. 2.
Survival curves of patients who underwent complete resection for pathologic (p-) stage I–IIIA non-small-cell lung cancer. Comparison according to Aurora-A expression status.

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