Formalin fixed (10 percent neutral buffered formalin) and paraffin embedded tissue sections (prepared in Surgical Pathology). Transport 5 unstained 5-10 micron slides (Minimum is 3 slides depending on the size of the tumor) with a matching HE slide marked tumor area. Tumor cell smear/cell block (prepared in Cytopathology) or blood samples may be used when there are enough tumor cells in the sample.