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Metastatic tumor evolution and organoid modeling implicate TGFBR2 as a cancer driver in diffuse gastric cancer

Nadauld, LD and Garcia, S and Natsoulis, G and Bell, JM and Miotke, L and Hopmans, ES and Xu, H and Pai, RK and Palm, C and Regan, JF and Chen, H and Flaherty, P and Ootani, A and Zhang, NR and Ford, JM and Kuo, CJ and Ji, HP (2014) Metastatic tumor evolution and organoid modeling implicate TGFBR2 as a cancer driver in diffuse gastric cancer. Genome biology, 15 (8). 428 - ?.

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BACKGROUND: Gastric cancer is the second-leading cause of global cancer deaths, with metastatic disease representing the primary cause of mortality. To identify candidate drivers involved in oncogenesis and tumor evolution, we conduct an extensive genome sequencing analysis of metastatic progression in a diffuse gastric cancer. This involves a comparison between a primary tumor from a hereditary diffuse gastric cancer syndrome proband and its recurrence as an ovarian metastasis.RESULTS: Both the primary tumor and ovarian metastasis have common biallelic loss-of-function of both the CDH1 and TP53 tumor suppressors, indicating a common genetic origin. While the primary tumor exhibits amplification of the Fibroblast growth factor receptor 2 (FGFR2) gene, the metastasis notably lacks FGFR2 amplification but rather possesses unique biallelic alterations of Transforming growth factor-beta receptor 2 (TGFBR2), indicating the divergent in vivo evolution of a TGFBR2-mutant metastatic clonal population in this patient. As TGFBR2 mutations have not previously been functionally validated in gastric cancer, we modeled the metastatic potential of TGFBR2 loss in a murine three-dimensional primary gastric organoid culture. The Tgfbr2 shRNA knockdown within Cdh1-/-; Tp53-/- organoids generates invasion in vitro and robust metastatic tumorigenicity in vivo, confirming Tgfbr2 metastasis suppressor activity.CONCLUSIONS: We document the metastatic differentiation and genetic heterogeneity of diffuse gastric cancer and reveal the potential metastatic role of TGFBR2 loss-of-function. In support of this study, we apply a murine primary organoid culture method capable of recapitulating in vivo metastatic gastric cancer. Overall, we describe an integrated approach to identify and functionally validate putative cancer drivers involved in metastasis.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Nadauld, LD
Garcia, S
Natsoulis, G
Bell, JM
Miotke, L
Hopmans, ES
Xu, H
Pai, RKrkp18@pitt.eduRKP18
Palm, C
Regan, JF
Chen, H
Flaherty, P
Ootani, A
Zhang, NR
Ford, JM
Kuo, CJ
Ji, HP
Date: 1 January 2014
Date Type: Publication
Journal or Publication Title: Genome biology
Volume: 15
Number: 8
Page Range: 428 - ?
DOI or Unique Handle: 10.1186/s13059-014-0428-9
Schools and Programs: School of Medicine > Pathology
Refereed: Yes
Date Deposited: 19 Sep 2016 15:54
Last Modified: 02 Feb 2019 15:59


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