Analysis of chromosomes 9 and 11 aneuploidy frequency in pleural effusion of patients with and without malignancy: interphase FISH technique.

Fluids of body cavities result in a series of pathophysiological events associated with non-malignant and malignant conditions that lead to the formation of exudative effusion. Diagnosis of effusion from the patients is frequently troublesome for the cytologist because of the differentiation and biological behavior of different cells type in effusion. In the present study, chromosomal aneuploidy status in effusion cells derived from 32 patients including 14 patients with non-malignant and 18 patients with malignant diseases [including malign mesothelioma (n = 6), adeno carcinoma (n = 10), small cell carcinoma (n = 2)] was analyzed by using fluorescence in situ hybridization (FISH) with centromere specific probes for chromosomes 9 and 11. There was significant difference in the incidence of chromosomal 9 and 11 aneuploidies when compared with controls (P = 0.000). However, aneuploidies of chromosomes 9 and 11 in effusion cells from patients with malignant disease had significantly higher than in effusion cells from patients with non-malignant (P = 0.000), suggesting that chromosomes 9 and 11 are frequently involved in the status of disease. The present study indicates that there is a association between chromosomes aneuploidies and pleural effusion cell status. Chromosome aneuploidies in non-malignant group may be an indicator of premalignancy.