A number of theories on the possible signal pathway of annexin A1 in cancer development are available. Annexin A1 was shown to stimulate epithelial cell migration/invasion through the activation of phosphatase inhibitor formal peptide receptors in metastasis development [24]. Annexin A1 promotes metastasis formation by enhancing TGF-beta/Smad signaling and actin reorganization, which facilitates an epithelial-to-mesenchymal transition -like switch. Thus, cell migration and invasion of metastatic breast cancer cells become
more selleckchem efficient [25]. In the present study, Cox regression analysis results showed that high Hsp90-beta and annexin A1 expressions might be an important risk factor for the post-surgical survival time of lung cancer subjects, and that a high expression might be an unfavorable factor for the prognosis of lung cancer patients. The risk ratios for lung cancer in individuals with upregulated Hsp90-beta and annexin A1 were 12.21× DAPT molecular weight and 6.6×, respectively, which are higher than those with low expressions. The final inducted variables were Hsp90-beta, annexin A1, pathologic grade, TNM stage, and lymphatic invasion. The final risk function was H(t) = [h0(t)]e(0.415X 5–1.012 X7-0.631 X8+1.552 X10+1.073X11). Lymphatic invasion, pathologic grade,
and TNM stage were also shown to be risk factors for the post-surgical survival time of lung cancer patients with OR values of 1.514, 0.697, and 0.532, respectively. The results indicated BCKDHA that poor differentiation and lymphatic invasion were also risk factors in
reducing the survival of patients. The risk function also indicated that Hsp90-beta and annexin A1 were risk factors for lung cancer progression. These data showed that the expressions of Hsp90-beta and annexin A1 are associated with post-surgical survival time and, therefore, has the potential to become a part of the prognostic index that can predict the post-surgical survival rate of patients with lung cancer. Annexin A1 expression was found in 59% in LAC, but 29.3% in LSCC. The degree of malignancy of LAC was significantly higher than LSCC. This result may suggest that a relationship exists between high expressions of annexin A1 and LAC. However, the mechanism remains unclear, and further investigation is required. The upregulation of Hsp90-beta and annexin A1 was observed in SCLC, but not in LSCC, LAC, and LCLC. This result suggests that the upregulation of Hsp90-beta and annexin A1 may be particularly related to the malignant invasion of SCLC. In clinical cases, early distant metastasis occurs more frequently in SCLC than in other histological types. SCLC is more aggressive and often widely metastasizes before the primary tumor mass in the lung becomes enlarged. Thus, further research is needed to explore the relationship among SCLC, Hsp90-beta, and annexin A1. Thus far, the role of annexin A1 as a prognostic factor in cancer remains ambiguous.