title: Common chromosomal abnormalities in mycosis fungoides transformation.
abstract: To identify cytogenetic features of large cell transformation in mycosis fungoides (T-MF), we selected in 11 patients, 16 samples either from skin tumors (13), lymph node (1), or peripheral blood cells (2) collected at the time of the transformation. Comparative genomic hybridization (CGH), G-banding, fluorescence in situ hybridisation (FISH), multicolour FISH (mFISH), and DNA content analysis were used. Fifteen samples displayed unbalanced CGH profiles, with gains more frequently observed than losses. Recurrent chromosomal alterations were observed for chromosomes 1, 2, 7, 9, 17, and 19. The most common imbalances were gain of chromosome regions 1p36, 7, 9q34, 17q24-qter, 19, and loss of 2q36-qter, 9p21, and 17p. In six samples 1p36-pter gain was associated with 9q34-qter gain and whole chromosome 19 gain. In five of these samples whole or partial gain of chromosome 17 was also observed. No specific pattern was seen with regard to the expression of the CD30 antigen by tumor cells. Cytogenetics and/or DNA content analysis of skin tumor cells revealed an abnormal chromosome number in all tested cases (n = 7) with DNA ploidy ranging from hyperdiploid (2.78) to hypotetraploid (3.69) (mean 3.14+/-0.38). Thus, T-MF displayed frequent chromosomal imbalances associated with hypotetraploidy.
authors.affiliation: Histology and Molecular Pathology Laboratory EA2406, Victor Segalen University, Bordeaux, France.
authors.forename: Martina
authors.initials: M
authors.lastname: Prochazkova
authors.forename: Edith
authors.initials: E
authors.lastname: Chevret
authors.forename: Guillaume
authors.initials: G
authors.lastname: Mainhaguiet
authors.forename: Jiri
authors.initials: J
authors.lastname: Sobotka
authors.forename: Béatrice
authors.initials: B
authors.lastname: Vergier
authors.forename: Marc-Antoine
authors.initials: MA
authors.lastname: Belaud-Rotureau
authors.forename: Marie
authors.initials: M
authors.lastname: Beylot-Barry
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Merlio
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001773:Blood Cells / Q000378:metabolism; D002471:Cell Transformation, Neoplastic; D002478:Cells, Cultured; D002869:Chromosome Aberrations; D002877:Chromosomes, Human; D005260:Female; D006801:Humans; D017404:In Situ Hybridization, Fluorescence / Q000379:methods; D008198:Lymph Nodes / Q000378:metabolism / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009182:Mycosis Fungoides / Q000235:genetics* / Q000473:pathology; D009693:Nucleic Acid Hybridization / Q000379:methods; D011123:Polyploidy; D012878:Skin Neoplasms / Q000235:genetics* / Q000473:pathology