RESUMO
<p><b>OBJECTIVE</b>To explore the relationship between the overexpression of PKA RIalpha mRNA and cliniopathological parameters in lung cancer.</p><p><b>METHODS</b>RT-PCR was used to detect the expression of PKA RIalpha mRNA in 54 cases with human lung cancer and matched normal tissues.</p><p><b>RESULTS</b>(1) The expression of PKA RIalpha mRNA was significantly higher in cancer tissue (66.7%) than in normal tissues (20.4%) (P < 0.01). (2) The expression was significantly correlated with TNM stage (P < 0.01), being increased with TNM stage. (3) The expression was significantly higher in patients with positive lymph nodes than in those with negative lymph nodes (P < 0.01). (4) There were no significant associations of PKA RIalpha mRNA expression with histological type, differentiation grade or size of the tumor.</p><p><b>CONCLUSION</b>This study indicates that the overexpression of PKA RIalpha mRNA may play an important role in the progression, metastasis and prognosis of lung cancer.</p>
Assuntos
Adulto , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Adenocarcinoma , Metabolismo , Carcinoma de Células Escamosas , Metabolismo , Subunidade RIalfa da Proteína Quinase Dependente de AMP Cíclico , Proteínas Quinases Dependentes de AMP Cíclico , Genética , Regulação Neoplásica da Expressão Gênica , Neoplasias Pulmonares , Metabolismo , Patologia , Metástase Linfática , Estadiamento de Neoplasias , Prognóstico , RNA Mensageiro , GenéticaRESUMO
<p><b>OBJECTIVE</b>To evaluate the expression of three different RASSF1 transcripts and its clinical significance in lung carcinomas.</p><p><b>METHODS</b>The mRNA expression of RASSF1A, RASSF1B and RASSF1C was detected by RT-PCR in 51 human lung cancer tissues and 51 matched normal tissues.</p><p><b>RESULTS</b>1. The mRNA expression of three RASSF1 transcripts was detectable in all non-cancer tissues. However, high rate of expression loss of RASSF1A and RASSF1B existed in lung cancer tissues, which was 53.2% (2851) and 37.3% (19/51), respectively. RASSF1C was expressed in all of the tumor tissues. 2. Loss or abnormal down-regulation of RASSF1A was positively related with lymph node metastasis and TNM stage (P < 0.05) and 3. RASSF1B and RASSF1C mRNA expression was not correlated with TNM stage, histological type, differentiation grade or smoking index.</p><p><b>CONCLUSION</b>There is a significant expression difference among the three RASSF1 transcripts in lung carcinoma. RASSF1A, closely associated with lymph metastasis and TNM stage of lung carcinoma, should be a new tumor suppressor gene.</p>