Carcinosarcomas (malignant mixed mullerian tumors) of the female genital tract: comparative molecular analysis of epithelial and mesenchymal components

Human Pathology
S KounelisS D Finkelstein

Abstract

Female genital tract carcinosarcomas (FGTCS) are biphasic neoplasms composed of an admixture of malignant epithelial and mesenchymal elements. Histogenesis of FGTCS centers on two theories: (1) simultaneous formation of independent tumors (biclonal theory), (2) multidirectional differentiation of a single neoplasm (monoclonal theory). In an attempt to resolve this histogenetic controversy, we determined the presence, specific genotype, and timing of p53 mutational change in each component of FGTCS using a topographic genotyping (TG) approach. We selected 43 FGTCS from the files of Magee-Womens Hospital, Pittsburgh, and initially immunostained them for p53 protein. Strong p53 immunopositivity was detected in 35 (82%) of 43 tumors. Subsequently, topographic genotyping (TG) was performed on a subset of nine immunopositive tumors with sufficiently distinct malignant components to enable effective sampling. All nine tumors showed point mutations in p53 exons 5 through 8. In each case, the identical point mutational genotype was present in both components. Furthermore, in all nine cases mutations were present with loss of the wild-type allele. P53 gene mutation is a frequent event in progression of FGTCS. Of importance, both p53 muta...Continue Reading

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