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2016 ; 7
(51
): 84428-84438
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MED12 mutations in breast phyllodes tumors: evidence of temporal tumoral
heterogeneity and identification of associated critical signaling pathways
#MMPMID27806318
Laé M
; Gardrat S
; Rondeau S
; Richardot C
; Caly M
; Chemlali W
; Vacher S
; Couturier J
; Mariani O
; Terrier P
; Bièche I
Oncotarget
2016[Dec]; 7
(51
): 84428-84438
PMID27806318
show ga
Exome sequencing has recently identified highly recurrent MED12 somatic mutations
in fibroadenomas (FAs) and phyllodes tumors (PTs). In the present study, based on
a large series, we confirmed the presence of MED12 exon 1 and 2 mutations in 49%
(41/83) of PTs, 70% (7/10) of FAs and 9.1% (1/11) of fibromatoses. We show that
MED12 mutations are associated with benign behavior of phyllodes tumors, as they
are detected less frequently in malignant PTs (27.6%) compared to benign (58.3%)
and borderline (63.3%) PTs, respectively (p = 0.0036). Phyllodes tumors presented
marked temporal heterogeneity of MED12 mutation status, as 50% (3/6) of primary
and recurrent phyllodes tumor pairs with MED12 mutation presented different MED12
mutations between the primary and recurrent tumors. There was no correlation
between MED12 status and genomic profiles obtained by array-CGH. MED12 mutations
are associated with altered expressions of the genes involved in the WNT (PAX3,
WNT3A, AXIN2), TGFB (TAGLN, TGFBR2, CTGF) and THRA (RXRA, THRA) signaling
pathways.In conclusion, this study confirmed that MED12 plays a central oncogenic
role in breast fibroepithelial tumorigenesis and identified a limited number of
altered signaling pathways that maybe associated with MED12 mutations. MED12 exon
1 and 2 mutation status and some of the altered genes identified in this study
could constitute useful diagnostic or prognostic markers, and form the basis for
novel therapeutic strategies for PTs.