Abstract
Real-time reverse transcription polymerase chain reaction and immunohistochemistry were used to evaluate the messenger RNA (mRNA) and protein expression levels of total cyclin D1 and its splice variants (cyclin D1a and cyclin D1b) in 102 paired malignant and nonmalignant tissues from patients with non-small cell lung cancer, respectively. The expression levels of total cyclin D1 and its splice variants were significantly up-regulated in malignant tissues than in nonmalignant tissues at both mRNA and protein levels. Although the expression levels of cyclin D1a were higher than those of cyclin D1b, the relative expression ratios of cyclin D1b mRNA between malignant and nonmalignant lung tissues were obviously higher than those of cyclin D1a mRNA. Analysis of variance showed that cyclin D1b mRNA expression was significantly associated with the histologic grade, lymph node metastasis, distant metastasis, and tumor stage of patients, whereas cyclin D1a mRNA expression was not related to clinicopathologic characteristics except sex. Patients with cyclin D1b mRNA expression above the median value had shorter survival than those below the median value (P = .033). Similarly, cyclin D1b immunopositivity was also associated with histologi...Continue Reading
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