Y chromosome loss detected by FISH in bladder cancer.
To examine the significance of Y chromosome losses in bladder cancer, fluorescence in situ hybridization (FISH) was used to determine its prevalence and associations with known parameters of malignancy. Cells were dissociated from formalin-fixed paraffin-embedded bladder tumors from 68 male patients and from 11 post-mortem bladder washes of male patients with a negative bladder cancer history, and were examined by FISH using centromeric probes for chromosomes X, Y, 7, 9, and 17. Nullisomy for chromosome Y was seen in 23 of 68 tumors (34%), monosomy in 28 of 68 tumors (41%), and polysomy in 17 of 68 tumors (25%). There was no association between chromosome Y loss and tumor grade, stage, tumor growth fraction (Ki67 LI), p53 immunostaining, and presence of p53 deletions. Patient age was higher for tumors with a Y loss (73.5 +/- 12.0 years) than for tumors without Y loss (66.6 +/- 10.8 years; p = 0.0207). In one normal bladder wash, a distinct subpopulation (38% of cells) with Y nullisomy was seen. These data suggest that Y loss is a frequent event that can occur early in bladder cancer, although there is no evidence for a role of Y loss in tumor progression.
Sauter
G
G
Institute of Pathology, University of Basel, Switzerland.
Moch
H
H
Wagner
U
U
Novotna
H
H
Gasser
T C
TC
Mattarelli
G
G
Mihatsch
M J
MJ
Waldman
F M
FM
D000367:Age Factors; D000368:Aged; D015342:DNA Probes; D017353:Gene Deletion; D016158:Genes, p53; D006801:Humans; D007150:Immunohistochemistry; D017404:In Situ Hybridization, Fluorescence; D008297:Male; D008875:Middle Aged; D010641:Phenotype; D001749:Urinary Bladder Neoplasms / Q000235:genetics* / Q000473:pathology; D014998:Y Chromosome
D015342:DNA Probes