title: Absence of microsatellite instability and lack of evidence for subclone diversification in the pathogenesis and progression of mycosis fungoides.
abstract: Mutator phenotypes with microsatellite instability (MSI) correlated with defects in the mismatch repair system are characteristic for a subset of solid neoplasms, but are rare in non-Hodgkin lymphomas. In mismatch repair-deficient mice, however, mutator-type non-Hodgkin lymphomas are the most frequent tumors. To determine the role of MSI in mycosis fungoides, we compared the states of the eight dinucleotide microsatellite loci DXS418, DXS453, DXS556, DXS1060, D1S201, D6S260, D9S162, and D10S215 in tumor cells of 12 well-characterized patients at early- and advanced-stage diseases to matched healthy tissue. We did not find any MSI, although all but one patient had progressed to advanced-stage disease within the timeframe of the study. Concordantly, the expression of mismatch repair genes was normal. These results suggest that progressive accumulation of mutations as detected by MS analysis does not play a major role in the pathogenesis or in the progression of mycosis fungoides.
authors: Department of Dermatology and Allergy, Skin Cancer Center Charité, Charité-Universitätsmedizin Berlin, Berlin, Germany. chalid.assaf@charite.de
authors: Chalid
authors: C
authors: Assaf
authors: José A A
authors: JA
authors: Sanchez
authors: Ansgar
authors: A
authors: Lukowsky
authors: Konrad
authors: K
authors: Kölble
authors: Tanja
authors: T
authors: Fischer
authors: Pierluigi
authors: P
authors: Amerio
authors: Wolfram
authors: W
authors: Sterry
authors: Peter
authors: P
authors: Walden
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D002869:Chromosome Aberrations; D053843:DNA Mismatch Repair; D004273:DNA, Neoplasm / Q000235:genetics*; D018450:Disease Progression; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D053842:Microsatellite Instability; D018895:Microsatellite Repeats / Q000235:genetics; D008875:Middle Aged; D009182:Mycosis Fungoides / Q000175:diagnosis / Q000235:genetics* / Q000473:pathology; D011379:Prognosis; D012878:Skin Neoplasms / Q000175:diagnosis / Q000235:genetics* / Q000473:pathology
chemical_list: D004273:DNA, Neoplasm