Gene expression profiles from formalin fixed paraffin embedded breast cancer tissue are largely comparable to fresh frozen matched tissue.

In the 70-gene analysis the degree of concordance between matched FFPE and FF samples was high (R 2 = 0.94) and, most intriguing, the prognosis prediction made using 60 DASL gene index showed a trend in agreement with the prediction of the diagnostic test MammaPrint [33] .

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