Abstract
Immunohistochemistry tests were
performed in 31 samples to elucidate the
biological behavior of the odontogenic
myxoma (OM), using markers related to
mechanisms of tumor progression (adhesion,
angiogenesis, apoptosis, inflammation
and cell proliferation). Odontogenic
epithelium was detected in four samples
with CK19 and CD138; the latter had a
low expression in the extracellular matrix
(ECM) and a high expression in tumor
cells. The mean microvascular density
(MVD), assessed with CD34 and VEGF-A,
was 7.51 and 5.35 blood vessels. A high
expression of orosomucoid-1 and mast cell
tryptase was observed in tumor cells and
ECM, while calretinin was negative. The
immunohistochemical profile mentioned
above, as well as the low expression of Ki-
67, Bcl-2 and p53 and the relatively low
MVD, suggest that the proliferative, antiapoptotic
and angiogenic activities do not
represent the main growing mechanisms
of OM, which could be associated to other
events, such as immunomodulation and
ECM degradation.
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