[Significance of caveolin-1 expression in primary lung cancer].
OBJECTIVE
To study the expression of caveolin-1 in primary lung cancer and its relationship with microvessel density and clinicopathologic parameters.


METHODS
Immunohistochemical study for caveolin-1 and CD34 was performed on paraffin sections of 154 cases of primary lung cancer and adjacent non-neoplastic lung parenchymal tissue, as well as 36 cases with nodal metastasis. Microvessel density was analyzed by CD34 immunostaining. Western blot assay was also employed in tumor and non-neoplastic lung tissues of the 50 cases (25 cases of pulmonary squamous cell carcinoma and 25 cases of pulmonary adenocarcinoma) with fresh specimens available.


RESULTS
Immunohistochemical study showed that non-neoplastic bronchial and alveolar epithelium was positive for caveolin-1 (membranous and cytoplasmic). The expression rate of caveolin-1 in lung cancer was 59.1%, which was significantly lower than that in normal lung tissues (P < 0.01). Western blot assay confirmed that the expression of caveolin-1 in pulmonary squamous cell carcinoma and adenocarcinoma was lower than in surrounding non-neoplastic lung tissues (P < 0.01). Caveolin-1 expression in pulmonary small cell carcinoma (7.1%) was significantly lower than that in non-small cell carcinoma (64.3%) (P < 0.01). Within the group of non-small cell carcinoma, the expression of caveolin-1 was much higher in patients with lymph node metastasis (P = 0.005). The expression was also higher in stage III and IV than in stage I and II disease (P = 0.042).


CONCLUSIONS
The expression of caveolin-1 is lower in lung cancer tissues than that in non-small cell carcinoma, it is also significantly correlated with tumor stage and lymph node metastasis. Caveolin-1 may play some role in the progression of pulmonary non-small cell carcinoma.
Yu
Juan-han
JH
Department of Pathology, College of Basic Medical Sciences, China Medical University, Shenyang 110001, China.
Wei
Qiang
Q
Qi
Feng-jie
FJ
Xu
Hong-tao
HT
Wang
En-hua
EH
D000230:Adenocarcinoma / Q000378:metabolism / Q000473:pathology; D000328:Adult; D000368:Aged; D015153:Blotting, Western; D002289:Carcinoma, Non-Small-Cell Lung / Q000378:metabolism* / Q000473:pathology; D002294:Carcinoma, Squamous Cell / Q000378:metabolism / Q000473:pathology; D051242:Caveolin 1 / Q000096:biosynthesis*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008168:Lung / Q000737:chemistry / Q000378:metabolism / Q000473:pathology; D008175:Lung Neoplasms / Q000378:metabolism* / Q000473:pathology; D008207:Lymphatic Metastasis; D008297:Male; D055806:Microvessels / Q000737:chemistry / Q000378:metabolism / Q000473:pathology; D008875:Middle Aged; D009367:Neoplasm Staging; D055752:Small Cell Lung Carcinoma / Q000378:metabolism / Q000473:pathology
D051242:Caveolin 1