Hi Brenda,

Yes the cytogenetic tests and the FISH tests are different.  With 
the cytogenetic analysis, they look at 20 cells through a microscope 
and look for the translocated chromosome (the philadelphia 
chromosome).  There is no error with this test because it is 
manually done and it is considered the "gold standard" for making 
clinical decisions.

The FISH test looks at 200-500 cells and looks for the bcr/abl 
transcript which is basically what causes the philadelphia 
chromosome.  The FISH is not fool proof and does have a false 
positive rate so few doctors will base any clinical decisions on 
it.  In fact, some doctors won't even bother doing it 
anymore....mine included.  

There are also studies that show the results will vary dramatically 
depending on which type of cells are scored (neutrophils as opposed 
to lymphocytes) so again, because the results are not fool proof and 
I guess not representative of what's really going on, I would focuss 
on what is the gold standard and that's your big fat zero on your 
cytogenetic test :)

Congratulations, you're a zero!
Tracey


--- In [email protected], "Brenda Morelli" <[EMAIL PROTECTED]> wrote:
> 
> Thanks Tracey,
> So the test for PH+ is different than what they are measuring in 
the 
> test for BCR/ABL [t(9;22) Interphase FISH], right?  He wasn't 
> negative per say, and did say the results looked great, and then 
did 
> the BUT..............and then he lost me.  I'm gonna probe him in 
> April.  Thanks for your response, I feel great right now.  
> Brenda  
> 
>





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