Figure 1: Hematoxylin-and-eosin staining of a
representative case of DFSP (STT491) (A), and an cellular
fibrous histiocytoma (STT169) (D), with confirmatory
immunohistochemical staining for CD34 (B, E), and APOD (C,
F). The DFSP is positive for CD34 (B), while the cellular
fibrous histiocytoma (E) shows CD34 positivity in only
endothelial cells, but not tumor cells. IHC for APOD is
strongly positive in DFSP (C), while the FH fails to stain
with antibodies against APOD (F) despite relative high levels
of APOD mRNA.
Figure 2: Hierarchical cluster analysis of gene
expression profiles of 36 tumors, including 9 DFSPs. Each row
represents the relative level of expression for a single gene,
centered at the geometric mean of its expression level across
the 36 samples. Each column shows the expression levels for a single sample. The red or green colors indicate high or low expression, respectively, relative to the mean. The intensity of the colors indicates the magnitude of deviation from the mean (see color bar).
Figure 3: Pairwise comparison of array CGH on 3 cases
of DFSP with DNA isolated from fresh frozen tumor and from
formalin-fixed, paraffin-embedded tumor showing nearly
identical regions of amplification on chromosomes 17 and
22. In contrast, 5 cases of solitary fibrous tumor show no
significant changes on these chromosomes.
Figure 4: Comparison of aCGH data of chromosomes 17 and
22 in 4 DFSP with mRNA levels of same genes relative to aCGH
data and expression levels in SFT.