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2018 ; 18
(1
): 738
Nephropedia Template TP
gab.com Text
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English Wikipedia
Chromoanasynthesis is a common mechanism that leads to ERBB2 amplifications in a
cohort of early stage HER2(+) breast cancer samples
#MMPMID30005627
Vasmatzis G
; Wang X
; Smadbeck JB
; Murphy SJ
; Geiersbach KB
; Johnson SH
; Gaitatzes AG
; Asmann YW
; Kosari F
; Borad MJ
; Serie DJ
; McLaughlin SA
; Kachergus JM
; Necela BM
; Thompson EA
BMC Cancer
2018[Jul]; 18
(1
): 738
PMID30005627
show ga
BACKGROUND: HER2 positive (HER2+) breast cancers involve chromosomal structural
alterations that act as oncogenic driver events. METHODS: We interrogated the
genomic structure of 18 clinically-defined HER2+ breast tumors through integrated
analysis of whole genome and transcriptome sequencing, coupled with clinical
information. RESULTS: ERBB2 overexpression in 15 of these tumors was associated
with ERBB2 amplification due to chromoanasynthesis with six of them containing
single events and the other nine exhibiting multiple events. Two of the more
complex cases had adverse clinical outcomes. Chromosomes 8 was commonly involved
in the same chromoanasynthesis with 17. In ten cases where chromosome 8 was
involved we observed NRG1 fusions (two cases), NRG1 amplification (one case),
FGFR1 amplification and ADAM32 or ADAM5 fusions. ERBB3 over-expression was
associated with NRG1 fusions and EGFR and ERBB3 expressions were anti-correlated.
Of the remaining three cases, one had a small duplication fully encompassing
ERBB2 and was accompanied with a pathogenic mutation. CONCLUSION:
Chromoanasynthesis involving chromosome 17 can lead to ERBB2 amplifications in
HER2+ breast cancer. However, additional large genomic alterations contribute to
a high level of genomic complexity, generating the hypothesis that worse outcome
could be associated with multiple chromoanasynthetic events.