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01.01.2009 | Preclinical Study

RUNX3 inactivation by frequent promoter hypermethylation and protein mislocalization constitute an early event in breast cancer progression

verfasst von: Manish Mani Subramaniam, Jason Yongsheng Chan, Richie Soong, Kosei Ito, Yoshiaki Ito, Khay Guan Yeoh, Manuel Salto-Tellez, Thomas Choudary Putti

Erschienen in: Breast Cancer Research and Treatment | Ausgabe 1/2009

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Abstract

Background We had previously established that inactivation of RUNX3 occurs by frequent promoter hypermethylation and protein mislocalization in invasive ductal carcinomas (IDC) of breast. Here, we hypothesize that inactivation of RUNX3 occurring in ductal carcinoma in situ (DCIS) represent early event in breast carcinogenesis. Methods The study cohort of 40 patients included 17 pure DCIS cases and 23 cases of DCIS with associated IDC (DCIS-IDC). The DCIS and IDC components of mixed cases were manually microdissected to permit separate evaluation. All the 63 samples including 17 pure DCIS, 23 samples each of DCIS and IDC of DCIS-IDC cases were analyzed for RUNX3 protein expression using R3-6E9 monoclonal antibody as well as promoter methylation status by methylation specific PCR. Results Compared to matched normal breast samples (4 of 40, 10%), DCIS (35 of 40, 88%) and IDC (21 of 23, 91%) exhibited significant RUNX3 inactivation (P < 0.001) in the form of negative or weak nuclear staining. In contrast to normal breast tissues (1/10, 10%), promoter hypermethylation of RUNX3 was significantly higher in the neoplastic breast samples (46 of total 61, 75%) including 30 of 40 (75%) DCIS and 16 of 21 (76%) IDC samples (P = 0.009). Overall, promoter hypermethylation correlated with RUNX3 inactivation in 42 of 46 (91%) methylated samples (P = 0.03). Mislocalized cytoplasmic expression also accounted for RUNX3 inactivation in majority of DCIS (33/40, 83%) and IDC (20/23, 87%) samples independent of promoter hypermethylation. Conclusion Our data suggest that RUNX3 inactivation by promoter hypermethylation and protein mislocalization constitute an early event in breast cancer progression.

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Titel: RUNX3 inactivation by frequent promoter hypermethylation and protein mislocalization constitute an early event in breast cancer progression
verfasst von: Manish Mani Subramaniam
Jason Yongsheng Chan
Richie Soong
Kosei Ito
Yoshiaki Ito
Khay Guan Yeoh
Manuel Salto-Tellez
Thomas Choudary Putti
Publikationsdatum: 01.01.2009
Verlag: Springer US
Erschienen in: Breast Cancer Research and Treatment / Ausgabe 1/2009
Print ISSN: 0167-6806
Elektronische ISSN: 1573-7217
DOI: https://doi.org/10.1007/s10549-008-9917-4

Springer Medizin

RUNX3 inactivation by frequent promoter hypermethylation and protein mislocalization constitute an early event in breast cancer progression

Abstract

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Springer Medizin

Abstract

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