title: Cytogenetic findings in phyllodes tumors of the breast: karyotypic complexity differentiates between malignant and benign tumors.
abstract: Clonal karyotypic abnormalities were detected in short-term cell cultures from six phyllodes tumors of the breast. Whereas all five benign tumors had simple chromosomal changes, the highly malignant one had a near-triploid stemline, indicating that karyotypic complexity is a marker of malignancy in phyllodes tumors. Interstitial deletions of the short arm of chromosome 3, del(3)(p12p14) and del(3)(p21p23),were the only aberrations in two benign tumors. Cytogenetic polyclonality was detected in three benign tumors: two had cytogenetically unrelated clones, whereas the third had three different, karyotypically related cell populations as evidence of clonal evolution. The finding of clonal chromosome abnormalities in both the epithelial and connective tissue components of the phyllodes tumors indicates that they are genuinely biphasic, that is, that both components are part of the neoplastic parenchyma.
authors.affiliation: Department of Pathology, The Norwegian Radium Hospital and Institute for Cancer Research, Oslo.
authors.forename: C U
authors.initials: CU
authors.lastname: Dietrich
authors.forename: N
authors.initials: N
authors.lastname: Pandis
authors.forename: H
authors.initials: H
authors.lastname: Rizou
authors.forename: C
authors.initials: C
authors.lastname: Petersson
authors.forename: G
authors.initials: G
authors.lastname: Bardi
authors.forename: H
authors.initials: H
authors.lastname: Qvist
authors.forename: N
authors.initials: N
authors.lastname: Apostolikas
authors.forename: P J
authors.initials: PJ
authors.lastname: Bøhler
authors.forename: J A
authors.initials: JA
authors.lastname: Andersen
authors.forename: I
authors.initials: I
authors.lastname: Idvall
authors.forename: F
authors.initials: F
authors.lastname: Mitelman
authors.forename: S
authors.initials: S
authors.lastname: Heim
mesh_terms: D001943:Breast Neoplasms / Q000175:diagnosis / Q000235:genetics* / Q000473:pathology*; D002471:Cell Transformation, Neoplastic / Q000235:genetics / Q000473:pathology; D002648:Child; D002869:Chromosome Aberrations / Q000175:diagnosis / Q000235:genetics / Q000473:pathology; D025063:Chromosome Disorders; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007621:Karyotyping; D003557:Phyllodes Tumor / Q000175:diagnosis / Q000235:genetics* / Q000473:pathology*