As the test of choice for
chromosomal rearrangements, FISH was successfully
applied to frozen as well as formalin-fixed paraffinembedded (FFPE) prostate cancer samples with high
sensitivity and specificity. Initially, a kit containing
dual-color ERG break-apart probes that can identify
rearrangement of the ERG gene but do not indicate the
5’-partner to which ERG is fused to, was used [48,49].
Later on, a tricolor FISH assay was developed by combining the red/green break-apart probes for TMPRSS2
with an orange-labeled fusion probe for the 3’ region of
ERG [50,51]. Recently, a four-color FISH assay was
reported, which allows the detection of either TMPRSS2
or ERG rearrangements regardless of the partner gene
As the test of choice forchromosomal rearrangements, FISH was successfullyapplied to frozen as well as formalin-fixed paraffinembedded (FFPE) prostate cancer samples with highsensitivity and specificity. Initially, a kit containingdual-color ERG break-apart probes that can identifyrearrangement of the ERG gene but do not indicate the5’-partner to which ERG is fused to, was used [48,49].Later on, a tricolor FISH assay was developed by combining the red/green break-apart probes for TMPRSS2with an orange-labeled fusion probe for the 3’ region ofERG [50,51]. Recently, a four-color FISH assay wasreported, which allows the detection of either TMPRSS2or ERG rearrangements regardless of the partner gene
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