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Moon SJ, Choi HJ, Kye YH, Jeong GY, Kim HY, Myung JK, Kong G. CTTN Overexpression Confers Cancer Stem Cell-like Properties and Trastuzumab Resistance via DKK-1/WNT Signaling in HER2 Positive Breast Cancer. Cancers (Basel) 2023; 15:cancers15041168. [PMID: 36831511 PMCID: PMC9954024 DOI: 10.3390/cancers15041168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 02/03/2023] [Accepted: 02/09/2023] [Indexed: 02/17/2023] Open
Abstract
BACKGROUND Despite the therapeutic success of trastuzumab, HER2 positive (HER2+) breast cancer patients continue to face significant difficulties due to innate or acquired drug resistance. In this study we explored the potential role of CTTN in inducing trastuzumab resistance of HER2+ breast cancers. METHODS Genetic changes of CTTN and survival of HER2+ breast cancer patients were analyzed in multiple breast cancer patient cohorts (METABRIC, TCGA, Kaplan-Meier (KM) plotter, and Hanyang University cohort). The effect of CTTN on cancer stem cell activity was assessed using the tumorsphere formation, ALDEFLUOR assay, and by in vivo xenograft experiments. CTTN-induced trastuzumab resistance was assessed by the sulforhodamine B (SRB) assay, colony formation assays, and in vivo xenograft model. RNA-seq analysis was used to clarify the mechanism of trastuzumab resistance conferred by CTTN. RESULTS Survival analysis indicated that CTTN overexpression is related to a poor prognosis in HER2+ breast cancers (OS, p = 0.05 in the Hanyang University cohort; OS, p = 0.0014 in KM plotter; OS, p = 0.008 and DFS, p = 0.010 in METABRIC). CTTN overexpression-induced cancer stem cell-like characteristics in experiments of tumorsphere formation, ALDEFLUOR assays, and in vivo limiting dilution assays. CTTN overexpression resulted in trastuzumab resistance in SRB, colony formation assays, and in vivo xenograft models. Mechanistically, the mRNA and protein levels of DKK-1, a Wnt antagonist, were downregulated by CTTN. Treatment of the β-catenin/TCF inhibitor reversed CTTN-induced cancer stem cell-like properties in vitro. Combination treatment with trastuzumab and β-catenin/TCF inhibitor overcame trastuzumab resistance conferred by CTTN overexpression in in vitro colony formation assays. CONCLUSIONS CTTN activates DKK-1/Wnt/β-catenin signaling to induce trastuzumab resistance. We propose that CTTN is a novel biomarker indicating a poor prognosis and a possible therapeutic target for overcoming trastuzumab resistance.
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Affiliation(s)
- So-Jeong Moon
- Department of HY-KIST Bio-Convergence, Hanyang University, Seoul 04763, Republic of Korea
- Department of Pathology, College of Medicine, Hanyang University, Seoul 04763, Republic of Korea
| | - Hyung-Jun Choi
- Department of Pathology, College of Medicine, Hanyang University, Seoul 04763, Republic of Korea
| | - Young-Hyeon Kye
- Department of HY-KIST Bio-Convergence, Hanyang University, Seoul 04763, Republic of Korea
- Department of Pathology, College of Medicine, Hanyang University, Seoul 04763, Republic of Korea
| | - Ga-Young Jeong
- Department of Pathology, College of Medicine, Hanyang University, Seoul 04763, Republic of Korea
| | - Hyung-Yong Kim
- Department of Pathology, College of Medicine, Hanyang University, Seoul 04763, Republic of Korea
| | - Jae-Kyung Myung
- Department of Pathology, College of Medicine, Hanyang University, Seoul 04763, Republic of Korea
| | - Gu Kong
- Department of HY-KIST Bio-Convergence, Hanyang University, Seoul 04763, Republic of Korea
- Department of Pathology, College of Medicine, Hanyang University, Seoul 04763, Republic of Korea
- Correspondence: ; Tel.: +82-2-2290-8251; Fax: +82-2-2295-1091
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Zhang G, Ren C, Li C, Wang Y, Chen B, Wen L, Jia M, Li K, Mok H, Cao L, Chen X, Lin J, Wei G, Li Y, Zhang Y, Balch CM, Liao N. Distinct clinical and somatic mutational features of breast tumors with high-, low-, or non-expressing human epidermal growth factor receptor 2 status. BMC Med 2022; 20:142. [PMID: 35484593 PMCID: PMC9052533 DOI: 10.1186/s12916-022-02346-9] [Citation(s) in RCA: 63] [Impact Index Per Article: 31.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 03/16/2022] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND HER2-low breast cancers were reported to have distinct clinicopathological characteristics from HER2-zero; however, the difference in their genetic features remains unclear. This study investigated the clinical and molecular features of breast tumors according to HER2 status. METHODS We analyzed the clinicopathological and genomic data of 523 Chinese women with breast cancer. Genomic data was generated by targeted next-generation sequencing (NGS) of breast tumor samples using a commercial 520 gene panel. The cohort was stratified according to HER2 status as HER2-zero (n = 90), HER2-low (n = 231), and HER2-positive (n = 202) according to their immunohistochemistry and fluorescence in situ hybridization results. RESULTS HER2-low breast tumors were enriched with hormone receptor-positive tumors, and who had lower Ki67 expression levels. Genes were differentially mutated across HER2 subgroups. HER2-low tumors had significantly more mutations involved in PI3K-Akt signaling than HER2-positive (p < 0.001) and HER2-zero breast tumors (p < 0.01). HER2-zero tumors had more mutations in checkpoint factors (p < 0.01), Fanconi anemia (p < 0.05), and p53 signaling and cell cycle pathway (p < 0.05) compared to HER2-low breast tumors. Compared with HER2-zero tumors, HER2-low tumors had significantly lower pathological complete response rates after neoadjuvant therapy (15.9% vs. 37.5%, p = 0.042) and proportion of relapsed/progressed patients across follow-up time points (p = 0.031), but had comparable disease-free survival (p = 0.271). CONCLUSION Our results demonstrate the distinct clinical and molecular features and clinical outcomes of HER2-low breast tumors.
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Affiliation(s)
- Guochun Zhang
- Department of Breast Surgery, Guangdong Provincial People's Hospital and Guangdong Academy of Medical Sciences, 106 Zhongshan Er Road, Guangzhou, 510080, China
| | - Chongyang Ren
- Department of Breast Surgery, Guangdong Provincial People's Hospital and Guangdong Academy of Medical Sciences, 106 Zhongshan Er Road, Guangzhou, 510080, China
| | - Cheukfai Li
- Department of Breast Surgery, Guangdong Provincial People's Hospital and Guangdong Academy of Medical Sciences, 106 Zhongshan Er Road, Guangzhou, 510080, China
| | - Yulei Wang
- Department of Breast Surgery, Guangdong Provincial People's Hospital and Guangdong Academy of Medical Sciences, 106 Zhongshan Er Road, Guangzhou, 510080, China
| | - Bo Chen
- Department of Breast Surgery, Guangdong Provincial People's Hospital and Guangdong Academy of Medical Sciences, 106 Zhongshan Er Road, Guangzhou, 510080, China
| | - Lingzhu Wen
- Department of Breast Surgery, Guangdong Provincial People's Hospital and Guangdong Academy of Medical Sciences, 106 Zhongshan Er Road, Guangzhou, 510080, China
| | - Minghan Jia
- Department of Breast Surgery, Guangdong Provincial People's Hospital and Guangdong Academy of Medical Sciences, 106 Zhongshan Er Road, Guangzhou, 510080, China
| | - Kai Li
- Department of Breast Surgery, Guangdong Provincial People's Hospital and Guangdong Academy of Medical Sciences, 106 Zhongshan Er Road, Guangzhou, 510080, China
| | - Hsiaopei Mok
- Department of Breast Surgery, Guangdong Provincial People's Hospital and Guangdong Academy of Medical Sciences, 106 Zhongshan Er Road, Guangzhou, 510080, China
| | - Li Cao
- Department of Breast Surgery, Guangdong Provincial People's Hospital and Guangdong Academy of Medical Sciences, 106 Zhongshan Er Road, Guangzhou, 510080, China
| | | | - Jiali Lin
- Department of Breast Surgery, Guangdong Provincial People's Hospital and Guangdong Academy of Medical Sciences, 106 Zhongshan Er Road, Guangzhou, 510080, China
- Department of Breast Surgery, Nanhai Second People's Hospital, Foshan, China
| | - Guangnan Wei
- Department of Breast Surgery, Guangdong Provincial People's Hospital and Guangdong Academy of Medical Sciences, 106 Zhongshan Er Road, Guangzhou, 510080, China
- School of Medicine, South China University of Technology, Guangzhou, China
| | - Yingzhi Li
- Department of Breast Surgery, Guangdong Provincial People's Hospital and Guangdong Academy of Medical Sciences, 106 Zhongshan Er Road, Guangzhou, 510080, China
- Shantou University Medical College, Shantou, China
| | - Yuchen Zhang
- Department of Breast Surgery, Guangdong Provincial People's Hospital and Guangdong Academy of Medical Sciences, 106 Zhongshan Er Road, Guangzhou, 510080, China
- School of Medicine, South China University of Technology, Guangzhou, China
| | - Charles M Balch
- Department of Surgical Oncology, UT MD Anderson Cancer Center, Houston, TX, USA
| | - Ning Liao
- Department of Breast Surgery, Guangdong Provincial People's Hospital and Guangdong Academy of Medical Sciences, 106 Zhongshan Er Road, Guangzhou, 510080, China.
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Basudan A, Priedigkeit N, Hartmaier RJ, Sokol ES, Bahreini A, Watters RJ, Boisen MM, Bhargava R, Weiss KR, Karsten MM, Denkert C, Blohmer JU, Leone JP, Hamilton RL, Brufsky AM, Elishaev E, Lucas PC, Lee AV, Oesterreich S. Frequent ESR1 and CDK Pathway Copy-Number Alterations in Metastatic Breast Cancer. Mol Cancer Res 2019; 17:457-468. [PMID: 30355675 PMCID: PMC6359977 DOI: 10.1158/1541-7786.mcr-18-0946] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 10/04/2018] [Accepted: 10/11/2018] [Indexed: 12/30/2022]
Abstract
DNA sequencing has identified a limited number of driver mutations in metastatic breast cancer beyond single base-pair mutations in the estrogen receptor (ESR1). However, our previous studies and others have observed that structural variants, such as ESR1 fusions, may also play a role. Therefore, we expanded upon these observations by performing a comprehensive and highly sensitive characterization of copy-number (CN) alterations in a large clinical cohort of metastatic specimens. NanoString DNA hybridization was utilized to measure CN gains, amplifications, and deletions of 67 genes in 108 breast cancer metastases, and in 26 cases, the patient-matched primary tumor. For ESR1, a copyshift algorithm was applied to identify CN imbalances at exon-specific resolution and queried large data sets (>15,000 tumors) that had previously undergone next-generation sequencing (NGS). Interestingly, a subset of ER+ tumors showed increased ESR1 CN (11/82, 13%); three had CN amplifications (4%) and eight had gains (10%). Increased ESR1 CN was enriched in metastatic specimens versus primary tumors, and this was orthogonally confirmed in a large NGS data set. ESR1-amplified tumors showed a site-specific enrichment for bone metastases and worse outcomes than nonamplified tumors. No ESR1 CN amplifications and only one gain was identified in ER- tumors. ESR1 copyshift was present in 5 of the 11 ESR1-amplified tumors. Other frequent amplifications included ERBB2, GRB7, and cell-cycle pathway members CCND1 and CDK4/6, which showed mutually exclusivity with deletions of CDKN2A, CDKN2B, and CDKN1B. IMPLICATIONS: Copy-number alterations of ESR1 and key CDK pathway genes are frequent in metastatic breast cancers, and their clinical relevance should be tested further.
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Affiliation(s)
- Ahmed Basudan
- Department of Human Genetics, University of Pittsburgh, Pittsburgh, Pennsylvania
- Women's Cancer Research Center, UPMC Hillman Cancer Center, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Clinical Lab Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Nolan Priedigkeit
- Women's Cancer Research Center, UPMC Hillman Cancer Center, University of Pittsburgh, Pittsburgh, Pennsylvania
- School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Ryan J Hartmaier
- Women's Cancer Research Center, UPMC Hillman Cancer Center, University of Pittsburgh, Pittsburgh, Pennsylvania
| | | | - Amir Bahreini
- Women's Cancer Research Center, UPMC Hillman Cancer Center, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Rebecca J Watters
- Department of Orthopedic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Michelle M Boisen
- Women's Cancer Research Center, UPMC Hillman Cancer Center, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Obstetrics and Gynecology, University of Pittsburgh, Pittsburgh, Pennsylvania
- Magee-Women Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Rohit Bhargava
- Women's Cancer Research Center, UPMC Hillman Cancer Center, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Kurt R Weiss
- Department of Orthopedic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Surgical Oncology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | | | | | | | - Jose P Leone
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Ronald L Hamilton
- Department of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Adam M Brufsky
- Women's Cancer Research Center, UPMC Hillman Cancer Center, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Esther Elishaev
- Women's Cancer Research Center, UPMC Hillman Cancer Center, University of Pittsburgh, Pittsburgh, Pennsylvania
- Magee-Women Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Peter C Lucas
- Department of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Adrian V Lee
- Department of Human Genetics, University of Pittsburgh, Pittsburgh, Pennsylvania
- Women's Cancer Research Center, UPMC Hillman Cancer Center, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Steffi Oesterreich
- Women's Cancer Research Center, UPMC Hillman Cancer Center, University of Pittsburgh, Pittsburgh, Pennsylvania.
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, Pennsylvania
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Affiliation(s)
- Emanuela Guerra
- Laboratory of Experimental Oncology, Department of Cell Biology and Oncology, Institute Mario Negri – Consorzio Mario Negri Sud, Santa Maria Imbaro (Chieti), Italy
| | - Saverio Alberti
- Laboratory of Experimental Oncology, Department of Cell Biology and Oncology, Institute Mario Negri – Consorzio Mario Negri Sud, Santa Maria Imbaro (Chieti), Italy
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Bagci O, Kurtgöz S. Amplification of Cellular Oncogenes in Solid Tumors. NORTH AMERICAN JOURNAL OF MEDICAL SCIENCES 2015; 7:341-6. [PMID: 26417556 PMCID: PMC4561439 DOI: 10.4103/1947-2714.163641] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The term gene amplification refers to an increase in copy number of a gene. Upregulation of gene expression through amplification is a general mechanism to increase gene dosage. Oncogene amplifications have been shown in solid human cancers and they are often associated with progression of cancer. Defining oncogene amplification is useful since it is used as a prognostic marker in clinical oncology nowadays, especially v-erb-b2 avian erythroblastic leukemia viral oncogene homolog 2 (HER2) targeted agents are used in breast cancer patients with high level of HER2 overexpression as a therapeutic approach. However, patients without HER2 overexpression do not appear to benefit from these agents. We concluded that determination of oncogene amplification in solid tumors is an important factor in treatment of human cancers with many unknowns. We have referred to PubMed and some databases to prepare this article.
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Affiliation(s)
- Ozkan Bagci
- Department of Medical Genetics, Suleyman Demirel University, School of Medicine, Isparta, Turkey
| | - Serkan Kurtgöz
- Department of Medical Genetics, Suleyman Demirel University, School of Medicine, Isparta, Turkey
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Maia LBL, Breginski FSC, Cavalcanti TCS, de Souza RLR, Roxo VMS, Ribeiro EMSF. No difference in CCND1 gene expression between breast cancer patients with and without lymph node metastasis in a Southern Brazilian sample. Clin Exp Med 2015; 16:593-598. [PMID: 26409837 DOI: 10.1007/s10238-015-0392-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Accepted: 09/12/2015] [Indexed: 12/14/2022]
Abstract
The Cyclin D1 protein has been extensively studied over the last decades, for its various roles in physiological processes, both in normal and cancer cells. Gene amplifications and overexpression of CCND1 are frequently reported in several types of cancers, including breast carcinomas, showing the increasing relevance of Cyclin D1 in tumorigenesis. Little is known about the role of this protein in the metastatic process, and the main objective of this study was to evaluate the importance of the CCND1 as a potential marker of tumor progression in breast carcinomas, in a sample collected in Southern Brazil. We studied 41 samples of formalin-fixed paraffin-embedded tissue sections from invasive ductal breast carcinomas subdivided into metastatic (n = 19) and non-metastatic (n = 22) tumors. Gene expression analysis was performed through Quantitative Real-Time PCR and immunohistochemistry. In spite of the higher expression levels of CCND1 mRNA and protein in tumors when compared with the control samples, no differences were observed between the metastatic and non-metastatic groups, suggesting that, in these samples, the expression of CCND1 has no significant influence on the metastatic process. Further studies must be performed in an attempt to clarify the diagnostic and prognostic value of Cyclin D1 in breast cancers, as well as the mechanisms that trigger its overexpression in tumors.
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Affiliation(s)
- L B L Maia
- Departamento de Genética, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Curitiba, Paraná, Brazil
| | - F S C Breginski
- Citolab- Laboratório de Citopatologia e Histopatologia, Batel, Curitiba, Paraná, Brazil
| | - T C S Cavalcanti
- Citolab- Laboratório de Citopatologia e Histopatologia, Batel, Curitiba, Paraná, Brazil
| | - R L R de Souza
- Departamento de Genética, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Curitiba, Paraná, Brazil
| | - V M S Roxo
- Departamento de Genética, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Curitiba, Paraná, Brazil
| | - E M S F Ribeiro
- Departamento de Genética, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Curitiba, Paraná, Brazil.
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Wilkerson PM, Reis-Filho JS. the 11q13-q14 amplicon: Clinicopathological correlations and potential drivers. Genes Chromosomes Cancer 2012; 52:333-55. [DOI: 10.1002/gcc.22037] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2012] [Accepted: 11/01/2012] [Indexed: 01/04/2023] Open
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Karlsson E, Waltersson MA, Bostner J, Pérez-Tenorio G, Olsson B, Hallbeck AL, Stål O. High-resolution genomic analysis of the 11q13 amplicon in breast cancers identifies synergy with 8p12 amplification, involving the mTOR targets S6K2 and 4EBP1. Genes Chromosomes Cancer 2011; 50:775-87. [PMID: 21748818 DOI: 10.1002/gcc.20900] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2010] [Accepted: 06/06/2011] [Indexed: 11/07/2022] Open
Abstract
The chromosomal region 11q13 is amplified in 15-20% of breast cancers; an event not only associated with estrogen receptor (ER) expression but also implicated in resistance to endocrine therapy. Coamplifications of the 11q13 and 8p12 regions are common, suggesting synergy between the amplicons. The aim was to identify candidate oncogenes in the 11q13 region based on recurrent amplification patterns and correlations to mRNA expression levels. Furthermore, the 11q13/8p12 coamplification and its prognostic value, was evaluated at the DNA and the mRNA levels. Affymetrix 250K NspI arrays were used for whole-genome screening of DNA copy number changes in 29 breast tumors. To identify amplicon cores at 11q13 and 8p12, genomic identification of significant targets in cancer (GISTIC) was applied. The mRNA expression levels of candidate oncogenes in the amplicons [RAD9A, RPS6KB2 (S6K2), CCND1, FGF19, FGF4, FGF3, PAK1, GAB2 (11q13); EIF4EBP1 (4EBP1), PPAPDC1B, and FGFR1 (8p12)] were evaluated using real-time PCR. Resulting data revealed three main amplification cores at 11q13. ER expression was associated with the central 11q13 amplification core, encompassing CCND1, whereas 8p12 amplification/gene expression correlated to S6K2 in a proximal 11q13 core. Amplification of 8p12 and high expression of 4EBP1 or FGFR1 was associated with a poor outcome in the group. In conclusion, single nucleotide polymorphism arrays have enabled mapping of the 11q13 amplicon in breast tumors with high resolution. A proximal 11q13 core including S6K2 was identified as involved in the coamplification/coexpression with 8p12, suggesting synergy between the mTOR targets S6K2 and 4EBP1 in breast cancer development and progression.
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MESH Headings
- Adaptor Proteins, Signal Transducing/genetics
- Biomarkers, Tumor/genetics
- Breast Neoplasms/diagnosis
- Breast Neoplasms/genetics
- Breast Neoplasms/mortality
- Breast Neoplasms/pathology
- Cell Cycle Proteins
- Chromosome Mapping
- Chromosomes, Human, Pair 11/chemistry
- Chromosomes, Human, Pair 11/genetics
- Chromosomes, Human, Pair 8/chemistry
- Chromosomes, Human, Pair 8/genetics
- Female
- Gene Amplification
- Gene Expression
- Genome, Human
- Genome-Wide Association Study
- Genomics/methods
- Humans
- Oligonucleotide Array Sequence Analysis
- Phosphoproteins/genetics
- Polymorphism, Single Nucleotide
- Prognosis
- Real-Time Polymerase Chain Reaction
- Ribosomal Protein S6 Kinases, 70-kDa/genetics
- Survival Analysis
- TOR Serine-Threonine Kinases/genetics
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Affiliation(s)
- Elin Karlsson
- Department of Clinical and Experimental Medicine, Division of Oncology, Faculty of Health Sciences, Linköping University, Linköping, Sweden.
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ANO1 amplification and expression in HNSCC with a high propensity for future distant metastasis and its functions in HNSCC cell lines. Br J Cancer 2010; 103:715-26. [PMID: 20664600 PMCID: PMC2938263 DOI: 10.1038/sj.bjc.6605823] [Citation(s) in RCA: 110] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Background: Head and neck squamous cell carcinoma (HNSCC) is associated with poor survival. To identify prognostic and diagnostic markers and therapeutic targets, we studied ANO1, a recently identified calcium-activated chloride channel (CaCC). Methods: High-resolution genomic and transcriptomic microarray analysis and functional studies using HNSCC cell line and CaCC inhibitors. Results: Amplification and overexpression of genes within the 11q13 amplicon are associated with the propensity for future distance metastasis of HPV-negative HNSCC. ANO1 was selected for functional studies based on high correlations, cell surface expression and CaCC activity. ANO1 overexpression in cells that express low endogenous levels stimulates cell movement, whereas downregulation in cells with high endogenous levels has the opposite effect. ANO1 overexpression also stimulates attachment, spreading, detachment and invasion, which could account for its effects on migration. CaCC inhibitors decrease movement, suggesting that channel activity is required for the effects of ANO1. In contrast, ANO1 overexpression does not affect cell proliferation. Interpretation: ANO1 amplification and expression could be markers for distant metastasis in HNSCC. ANO1 overexpression affects cell properties linked to metastasis. Inhibitors of CaCCs could be used to inhibit the tumourigenic properties of ANO1, whereas activators developed to increase CaCC activity could have adverse effects.
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Worsley SD, Jennings BA, Khalil KH, Mole M, Girling AC. Cyclin D1 amplification and expression in human breast carcinoma: correlation with histological prognostic markers and oestrogen receptor expression. Mol Pathol 2010; 49:M46-50. [PMID: 16696045 PMCID: PMC408018 DOI: 10.1136/mp.49.1.m46] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Aims-To study the amplification of the Cyclin D1 gene (CCND1) in human breast carcinoma; to relate this to Cyclin D1 protein expression; to relate these parameters to recognised pathological prognostic factors, including oestrogen receptor (ER) status.Methods-DNA extracted from frozen sections of breast tumours (n = 36) was used for Southern blotting. Probes for CCND1, c-myc and the immunoglobulin heavy chain locus (IgH) were hybridised to tumour DNA. Immunocytochemical expression of Cyclin D1 protein and ER was studied in paraffin wax sections from the same tumours.Results-Amplification of CCND1 was observed in 11% (four of 36) of tumours studied. Over expression of Cyclin D1 protein was observed in 73% (30/41) of tumours. There was no correlation between recognised histological prognostic markers and either gene amplification or expression. However, a weak association was seen between Cyclin D1 expression and ER status.Conclusions-A disparity exists between locus amplification and over expression of Cyclin D1, suggesting the existence of another mechanism for raised protein expression. No significant correlation was detected between either Cyclin D1 amplification or over expression and established prognostic markers.
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Affiliation(s)
- S D Worsley
- Molecular Genetics Department, Norfolk and Norwich NHS Healthcare Trust, Brunswick Road, Norwich NR1 3SR
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11
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Gene products of chromosome 11q and their association with CCND1 gene amplification and tamoxifen resistance in premenopausal breast cancer. Breast Cancer Res 2008; 10:R81. [PMID: 18823530 PMCID: PMC2614516 DOI: 10.1186/bcr2150] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2008] [Revised: 08/04/2008] [Accepted: 09/29/2008] [Indexed: 12/16/2022] Open
Abstract
INTRODUCTION The amplification event occurring at chromosome locus 11q13, reported in several different cancers, includes a number of potential oncogenes. We have previously reported amplification of one such oncogene, namely CCND1, to be correlated with an adverse effect of tamoxifen in premenopausal breast cancer patients. Over-expression of cyclin D1 protein, however, confers tamoxifen resistance but not a tamoxifen-induced adverse effect. Potentially, co-amplification of an additional 11q13 gene, with a resulting protein over-expression, is required to cause an agonistic effect. Moreover, during 11q13 amplification a deletion of the distal 11q region has been described. In order to assess the potential impact of the deletion we examined a selected marker for this event. METHOD Array comparative genomic hybridization analysis was employed to identify and confirm changes in the gene expression of a number of different genes mapping to the 11q chromosomal region, associated with CCND1 amplification. The subsequent protein expression of these candidate genes was then examined in a clinical material of 500 primary breast cancers from premenopausal patients who were randomly assigned to either tamoxifen or no adjuvant treatment. The protein expression was also compared with gene expression data in a subset of 56 breast cancer samples. RESULTS Cortactin and FADD (Fas-associated death domain) over-expression was linked to CCND1 amplification, determined by fluorescence in situ hybridization, but was not associated with a diminished effect of tamoxifen. However, deletion of distal chromosome 11q, defined as downregulation of the marker Chk1 (checkpoint kinase 1), was associated with an impaired tamoxifen response, and interestingly with low proliferative breast cancer of low grade. For Pak1 (p21-activated kinase 1) and cyclin D1 the protein expression corresponded to the gene expression data. CONCLUSIONS The results indicate that many 11q13 associated gene products are over-expressed in conjunction with cyclin D1 but not linked to an agonistic effect of tamoxifen. Finally, the deletion of distal 11q, linked to 11q13 amplification, might be an important event affecting breast cancer outcome and tamoxifen response.
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Huang X, Godfrey TE, Gooding WE, McCarty KS, Gollin SM. Comprehensive genome and transcriptome analysis of the 11q13 amplicon in human oral cancer and synteny to the 7F5 amplicon in murine oral carcinoma. Genes Chromosomes Cancer 2006; 45:1058-69. [PMID: 16906560 DOI: 10.1002/gcc.20371] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
11q13 amplification occurs in a wide variety of tumors, including almost half of oral squamous cell carcinomas (OSCC) where it has been correlated with a poor outcome. In this study, we compiled 3.6 Mb of DNA sequence in the 11q13 amplicon core and refined the physical map of the amplicon. In the process, we determined the genomic structure and normal tissue expression patterns of two recently identified genes, TAOS2/TMEM16A and MRGF, which reside in the amplicon core. We then quantified DNA copy number and mRNA expression of all genes in the 11q13 amplicon in cell lines and primary tumors from OSCC. With the exception of FGF3, FGF4, FGF19, and MRGF, all genes were overexpressed in most tumors with genomic amplification. Furthermore, we found that the expression of genes in the amplicon appeared to be highly coordinated, making it difficult to determine which gene or genes are driving amplification. However, in nonamplified primary tumors, three genes, TAOS2/TMEM16A, OCIM, and TPCN2, are frequently overexpressed, whereas CCND1 and EMS1 are not. These results suggest that in addition to CCND1 and EMS1, other important genes also may be target genes driving 11q13 amplification. We hypothesize that 11q13 amplification may be driven by a cassette of genes that provide growth or metastatic advantage to cancer cells. This is supported by the finding that the human 11q13 amplicon core is syntenic to mouse chromosomal band 7F5, which is frequently amplified in chemically induced murine OSCC. This article contains Supplementary Material available at http://www.interscience.wiley.com/jpages/1045-2257/suppmat
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Affiliation(s)
- Xin Huang
- Department of Human Genetics, University of Pittsburgh Graduate School of Public Health, Pittsburgh, PA 15261, USA
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13
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Cheng CK, Chow LWC, Loo WTY, Chan TK, Chan V. The cell cycle checkpoint gene Rad9 is a novel oncogene activated by 11q13 amplification and DNA methylation in breast cancer. Cancer Res 2005; 65:8646-54. [PMID: 16204032 DOI: 10.1158/0008-5472.can-04-4243] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Human Rad9 (hRad9), a structural homologue of yeast Schizosaccharomyces pombe rad9, is involved in cell cycle checkpoints and apoptosis. hRad9 can serve as a corepressor of androgen receptor in prostate cancer cells, but little is known about its role in the development of breast or other cancers. In the present study, semiquantitative reverse transcription-PCR showed that Rad9 mRNA levels were up-regulated in 52.1% (25 of 48) of breast tumors, and this up-regulation correlated with tumor size (P = 0.037) and local recurrence (P = 0.033). Overexpression of Rad9 mRNA was partly due to an increase in Rad9 gene number as measured by quantitative PCR. In other breast tumors with Rad9 mRNA overexpression but without increase in gene number, there was differential methylation of two putative Sp1/3 binding sites within the first and second introns of the Rad9 gene, which was similarly found in MCF-7 breast cancer cell line with increased Rad9 mRNA. Silencing Rad9 expression by RNA interference in MCF-7 cell line inhibited its proliferation in vitro. Promoter assays indicated that the Sp1/3 site in intron 2 may act as a silencer. In vivo binding of Sp3 to intron 2 was shown by chromatin immunoprecipitation assays. Treatment of MCF-7 cell line with 5'-aza-2'-deoxycytidine reduced Rad9 mRNA expression and also increased binding of Sp3 to the demethylated intron 2 region. Collectively, these findings suggest that Rad9 is a novel oncogene candidate activated by 11q13 amplification and DNA hypermethylation in breast cancer and may play a role in tumor proliferation and local invasion.
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MESH Headings
- Azacitidine/analogs & derivatives
- Azacitidine/pharmacology
- Base Sequence
- Breast Neoplasms/genetics
- Breast Neoplasms/metabolism
- Breast Neoplasms/pathology
- Breast Neoplasms, Male/genetics
- Breast Neoplasms, Male/metabolism
- Breast Neoplasms, Male/pathology
- Cell Cycle Proteins/antagonists & inhibitors
- Cell Cycle Proteins/biosynthesis
- Cell Cycle Proteins/genetics
- Cell Growth Processes/genetics
- Cell Line, Tumor
- Chromosomes, Human, Pair 11/genetics
- Cyclin D1/genetics
- DNA Methylation
- Decitabine
- Female
- Gene Amplification
- Gene Expression Regulation, Neoplastic
- Gene Silencing
- Humans
- Introns
- Male
- Middle Aged
- Molecular Sequence Data
- RNA, Messenger/antagonists & inhibitors
- RNA, Messenger/biosynthesis
- RNA, Messenger/genetics
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Affiliation(s)
- Chi Keung Cheng
- University Department of Medicine, Queen Mary Hospital, Pokfulam, Hong Kong, China
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14
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Abstract
Taking a perspective on available evidence that emphasizes relevance to human disease, cyclin D1 is solidly established as an oncogene with an important pathogenetic role in breast cancer and other human tumors. However, the precise cellular mechanisms through which aberrant cyclin D1 expression drives human neoplasia are less well established. Indeed, emerging evidence suggests that cyclin D1 might act, predominantly or at least in part, through pathways that do not involve its widely accepted function as a cell cycle regulator. Although therapeutic exploitation of the role of cyclin D1 as a molecular driver of breast cancer carries great promise, it is also suggested that direct targeting of the cyclin D1 gene or gene products may prove more successful than approaches that rely on arguably incomplete knowledge of the oncogenic mechanisms of cyclin D1.
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Affiliation(s)
- Andrew Arnold
- Center for Molecular Medicine, University of Connecticut School of Medicine, 263 Farmington Ave, Farmington, CT 06030-3101, USA.
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15
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Kilker RL, Hartl MW, Rutherford TM, Planas-Silva MD. Cyclin D1 expression is dependent on estrogen receptor function in tamoxifen-resistant breast cancer cells. J Steroid Biochem Mol Biol 2004; 92:63-71. [PMID: 15544931 DOI: 10.1016/j.jsbmb.2004.05.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2004] [Accepted: 05/23/2004] [Indexed: 11/20/2022]
Abstract
The development of resistance to tamoxifen, the most common antiestrogen used in the treatment of breast cancer, is a frequent and severe clinical problem. Tamoxifen-resistant tumors are still capable of responding to other hormonal therapies such as those that downregulate estrogen receptor expression. Mechanisms leading to acquisition of tamoxifen-resistant but hormone-sensitive growth are not completely understood. In tamoxifen-sensitive breast cancer cells, tamoxifen inhibits, whereas estrogen induces, expression of cyclin D1, a key cell cycle regulatory protein. Ectopic expression of cyclin D1 can lead to antiestrogen resistance. Thus, to determine whether cyclin D1 is involved in the growth of tamoxifen-resistant cells, we developed several tamoxifen-resistant variants from MCF-7 cells. These variants grow in the absence of estrogen or in the presence of tamoxifen, but their growth is inhibited by estrogen receptor downregulators. We show here that cyclin D1 expression is maintained at comparable levels in all tamoxifen-resistant variants, whereas pS2, another estrogen-regulated protein, is not. The addition of physiological levels of estrogen further stimulates cyclin D1 expression and proliferation. In contrast, treatment with estrogen receptor downregulators decreases cyclin D1 expression and proliferation. Thus, changes in cyclin D1 expression upon second-line hormonal therapy may predict hormonal sensitivity of tamoxifen-resistant tumors. These studies suggest that estrogen receptor mediates cyclin D1 expression and growth of tamoxifen-resistant tumors.
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Affiliation(s)
- Robin L Kilker
- Department of Pharmacology, Penn State College of Medicine, Hershey, PA 17033, USA
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16
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Ormandy CJ, Musgrove EA, Hui R, Daly RJ, Sutherland RL. Cyclin D1, EMS1 and 11q13 amplification in breast cancer. Breast Cancer Res Treat 2003; 78:323-35. [PMID: 12755491 DOI: 10.1023/a:1023033708204] [Citation(s) in RCA: 187] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Chromosome locus 11q13 is frequently amplified in a number of human cancers including carcinoma of the breast where up to 15% carry this chromosomal abnormality. Originally 11q13 amplification was thought to involve a single amplicon spanning many megabases, but more recent data have identified four core regions within 11q13 that can be amplified independently or together in different combinations. Although the region harbors several genes with known or suspected oncogenic potential, the complex structure of the amplicons and the fact that 11q13 is gene-rich have made definitive identification of specific genes that contribute to the genesis and progression of breast cancer a difficult and continuing process. To date CCND1, encoding the cell cycle regulatory gene cyclin D1, and EMS1, encoding the filamentous actin binding protein and c-Src substrate cortactin, are the favored candidates responsible for the emergence of two of the four amplification cores.
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Affiliation(s)
- Christopher J Ormandy
- Cancer Research Program, Garvan Institute of Medical Research, St. Vincent's Hospital, Sydney, NSW, Australia
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17
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Hwang TS, Han HS, Hong YC, Lee HJ, Paik NS. Prognostic value of combined analysis of cyclin D1 and estrogen receptor status in breast cancer patients. Pathol Int 2003; 53:74-80. [PMID: 12588434 DOI: 10.1046/j.1440-1827.2003.01441.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The amplification of cyclin D1, located on chromosome 11q13, in breast cancer patients has been found to be associated with reduced relapse-free and overall survival; however, there still exists strong controversy about these findings. In order to evaluate the prognostic value of cyclin D1 and other prognostic variables in human breast cancers, we have assessed estrogen receptor (ER) status, cyclin D1, c-erbB2 and p53 overexpression in 175 primary breast carcinomas, and investigated the relationships of prognostic variables to the patient clinical outcome and the association between cyclin D1 overexpression and other prognostic variables. There was some degree of variability in staining intensities and proportions within the same tumor. The overexpression of both cyclin D1 and ER revealed a significantly prolonged survival in univariate analysis (P = 0.020). Among the various prognostic variables, distant metastasis showed a statistically significant association with overall survival. A significant correlation was observed between cyclin D1 overexpression and small size of the primary tumor (P = 0.031), low Bloom and Richardson's histological grade (P = 0.001), and positive ER status (P = 0.000). In contrast to what was previously expected, the present study suggests that the overexpression of cyclin D1 has a tendency to have a positive clinical outcome and a potential role in identifying a subset of patients predicting a good prognosis, particularly when ER is coexpressed.
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MESH Headings
- Biomarkers, Tumor/metabolism
- Breast Neoplasms/metabolism
- Breast Neoplasms/mortality
- Breast Neoplasms/pathology
- Breast Neoplasms/therapy
- Carcinoma, Intraductal, Noninfiltrating/metabolism
- Carcinoma, Intraductal, Noninfiltrating/mortality
- Carcinoma, Intraductal, Noninfiltrating/secondary
- Carcinoma, Intraductal, Noninfiltrating/therapy
- Cell Nucleus/metabolism
- Cell Nucleus/pathology
- Combined Modality Therapy
- Cyclin D1/metabolism
- Disease-Free Survival
- Female
- Humans
- Immunoenzyme Techniques
- Middle Aged
- Neoplasm Staging
- Receptor, ErbB-2/metabolism
- Receptors, Estrogen/metabolism
- Survival Analysis
- Survival Rate
- Tumor Suppressor Protein p53/metabolism
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Affiliation(s)
- Tae Sook Hwang
- Department of Pathology, Inha University College of Medicine, Incheon, Korea.
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18
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Kim S, Zagozdzon R, Meisler A, Baleja JD, Fu Y, Avraham S, Avraham H. Csk homologous kinase (CHK) and ErbB-2 interactions are directly coupled with CHK negative growth regulatory function in breast cancer. J Biol Chem 2002; 277:36465-70. [PMID: 12122014 DOI: 10.1074/jbc.m206018200] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Our previous studies demonstrated that Csk homologous kinase (CHK) acts as a negative growth regulator of human breast cancer through inhibition of ErbB-2/neu-mediated Src family kinase activity (Bougeret, C., Jiang, S., Keydar, I., and Avraham, H. (2001) J. Biol. Chem. 276, 33711-33720. The interaction between the CHK SH2 domain and Tyr(P)(1248) of the ErbB-2 receptor has been shown to be specific and critical for CHK function. In this report, we investigated whether the interaction of the CHK SH2 domain and ErbB-2 is directly related to the inhibition of heregulin-stimulated Src kinase activity. We constructed three CHK SH2 domain binding mutants: G129R (enhanced binding), R147K (inhibited binding), and R147A (disrupted binding). NMR spectra for the domains of each construct were used to evaluate their interaction with a Tyr(P)(1248)-containing ErbB-2 peptide. G129R showed enhanced binding to ErbB-2, whereas binding was completely disrupted by R147A. The enhanced binding mutant showed chemical shift changes at the same residues as wild-type CHK, indicating that this mutant has the same binding characteristics as the wild-type protein. Furthermore, inhibition of heregulin-stimulated Src kinase activity was markedly diminished by R147A, whereas G129R-mediated inhibition was stronger as compared with wild-type CHK. These results indicate that the specific interaction of CHK and ErbB-2 via the SH2 domain of CHK is directly related to the growth inhibitory effects of CHK. These new CHK high affinity binding constructs may serve as good candidates for inhibition of the ErbB-2/Src transduction pathway in gene therapy studies in breast cancer.
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Affiliation(s)
- Soyoun Kim
- Division of Experimental Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02115, USA
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19
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Landberg G. Multiparameter analyses of cell cycle regulatory proteins in human breast cancer: a key to definition of separate pathways in tumorigenesis. Adv Cancer Res 2002; 84:35-56. [PMID: 11883531 DOI: 10.1016/s0065-230x(02)84002-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Breast cancer is one of the most common cancer forms affecting many women. The disease nevertheless has widely varying behavior and therefore patient outcome, and an important undertaking is to define and understand the molecular mechanisms behind these actions. Defects in the G1/S transition in the cell cycle affect both tumor proliferation and the fidelity of check points responsible for chromosomal integrity and DNA damage response and has lately been shown to represent one of a rather limited set of key aberrations in the transformation process. Many cell cycle regulatory proteins are either oncogenes or suppressor genes or are closely associated to the transformation process. The types of aberrations in the G1/S transition seem to be different in various cancers but are nevertheless often linked to clinical behaviors. In this review the role of multiparameter analyses of cell cycle regulatory proteins in breast cancer will be outlined with special attention to pattern analyses as well as the definition of two contrasting pathways in tumorigenesis defined by either cyclin D1 or cyclin F overexpression.
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Affiliation(s)
- Göran Landberg
- Department of Laboratory Medicine, Lund University, Malmö University Hospital, Sweden
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20
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Bièche I, Olivi M, Noguès C, Vidaud M, Lidereau R. Prognostic value of CCND1 gene status in sporadic breast tumours, as determined by real-time quantitative PCR assays. Br J Cancer 2002; 86:580-6. [PMID: 11870541 PMCID: PMC2375286 DOI: 10.1038/sj.bjc.6600109] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2001] [Revised: 11/19/2001] [Accepted: 11/30/2001] [Indexed: 11/09/2022] Open
Abstract
The CCND1 gene, a key cell-cycle regulator, is often altered in breast cancer, but the mechanisms underlying CCND1 dysregulation and the clinical significance of CCND1 status are unclear. We used real-time quantitative PCR and RT-PCR assays based on fluorescent TaqMan methodology to quantify CCND1 gene amplification and expression in a large series of breast tumours. CCND1 overexpression was observed in 44 (32.8%) of 134 breast tumour RNAs, ranging from 3.3 to 43.7 times the level in normal breast tissues, and correlated significantly with positive oestrogen receptor status (P=0.0003). CCND1 overexpression requires oestrogen receptor integrity and is exacerbated by amplification at 11q13 (the site of the CCND1 gene), owing to an additional gene dosage effect. Our results challenge CCND1 gene as the main 11q13 amplicon selector. The relapse-free survival time of patients with CCND1-amplified tumours was shorter than that of patients without CCND1 alterations, while that of patients with CCND1-unamplified-overexpressed tumours was longer (P=0.011). Only the good prognostic significance of CCND1-unamplified-overexpression status persisted in Cox multivariate regression analysis. This study confirms that CCND1 is an ER-responsive or ER-coactivator gene in breast cancer, and points to the CCND1 gene as a putative molecular marker predictive of hormone responsiveness in breast cancer. Moreover, CCND1 amplification status dichotomizes the CCND1-overexpressing tumors into two groups with opposite outcomes.
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Affiliation(s)
- I Bièche
- Laboratoire de Génétique Moléculaire-UPRES JE 2195, Faculté des Sciences Pharmaceutiques et Biologiques, Université René Descartes-Paris V, 4 Avenue de l'Observatoire, F-75006 Paris, France.
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21
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Cheung KL, Nicholson RI, Blamey RW, Robertson JF. Selection of primary breast cancer patients for adjuvant endocrine therapy--is oestrogen receptor alone adequate? Breast Cancer Res Treat 2001; 65:155-62. [PMID: 11261831 DOI: 10.1023/a:1006430401243] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Among 834 patients who had primary breast cancer treated by surgery without adjuvant systemic therapy, 363 had relapse treated by endocrine therapy alone. Patients with oestrogen receptor positive tumours (median: 70 vs. 45 months, p < 0.0001) or with non-progression at 6 months of therapy (median: 111 vs. 37 months, p < 0.0001) survived longer than those with oestrogen receptor negative tumours or with disease progression respectively, presumably due to the effect of therapy. On the other hand, the median disease-free interval, uninfluenced by therapy, showed a similar difference: oestrogen receptor positive versus negative = 29 versus 21 months, p < 0.005; non-progression versus progression = 40 versus 19 months, p < 0.0001. Patients with oestrogen receptor-positive tumours and non-progression at 6 months had the longest disease-free interval. The present study has established that there are factors, other than the oestrogen receptor, inherent in the primary tumour as reflected by the disease-free interval, which affect hormone sensitivity. Selection of adjuvant endocrine therapy based on the oestrogen receptor alone would deem inadequate. Further studies to elucidate other possible factors are warranted to refine the use of endocrine therapy, especially in the adjuvant setting when no indication of response is available.
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Affiliation(s)
- K L Cheung
- Professorial Unit of Surgery, City Hospital, Nottingham, UK.
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22
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Lamb J, Ladha MH, McMahon C, Sutherland RL, Ewen ME. Regulation of the functional interaction between cyclin D1 and the estrogen receptor. Mol Cell Biol 2000; 20:8667-75. [PMID: 11073968 PMCID: PMC86475 DOI: 10.1128/mcb.20.23.8667-8675.2000] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We report that the functional interaction between cyclin D1 and the estrogen receptor (ER) is regulated by a signal transduction pathway involving the second messenger, cyclic AMP (cAMP). The cell-permeable cAMP analogue 8-bromo-cAMP caused a concentration-dependent enhancement of cyclin D1-ER complex formation, as judged both by coimmunoprecipitation and mammalian two-hybrid analysis. This effect was paralleled by increases in ligand-independent ER-mediated transcription from an estrogen response element containing reporter construct. These effects of 8-bromo-cAMP were antagonized by a specific protein kinase A (PKA) inhibitor, indicating that the signaling pathway involved was PKA dependent. Further, we show that culture of MCF-7 cells on a cellular substratum of murine preadipocytes also enhanced the functional interaction between cyclin D1 and ER in a PKA-dependent manner. These findings demonstrate a collaboration between cAMP signaling and cyclin D1 in the ligand-independent activation of ER-mediated transcription in mammary epithelial cells and show that the functional associations of cyclin D1 are regulated as a function of cellular context.
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Affiliation(s)
- J Lamb
- Dana-Farber Cancer Institute and Harvard Medical School, Boston, Massachusetts 02115, USA
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23
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Watatani M, Inui H, Nagayama K, Imanishi Y, Nishimura K, Hashimoto Y, Yamauchi E, Hojo T, Kotsuma Y, Yamato M, Matsunami N, Yasutomi M. Identification of high-risk breast cancer patients from genetic changes of their tumors. Surg Today 2000; 30:516-22. [PMID: 10883462 DOI: 10.1007/s005950070118] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
To identify the genetic prognostic markers for breast cancer, we analyzed loss of heterozygosity (LOH) at 11p, 16q, 17p, 17q, and 18q, as well as amplification of the ERBB2, INT2, and MYC genes, in 131 patients with breast carcinoma, 49 of whom had lymph node involvement, but none of whom had distant metastases. Among the several chromosome arms tested, LOH at 17q was correlated with lymph node metastasis. Amplification of the ERBB2, MYC, and INT2 genes was found more frequently in tumors from patients with lymph node metastases than in tumors from those without lymph node metastases. Univariate analysis demonstrated that LOH at 17q and INT2 amplification were factors influencing disease-free survival (DFS). A multivariate analysis was performed on 89 tumors that were able to be evaluated for both LOH at 17q and INT2 amplification, and the results showed that patients who had tumors with these genetic changes were more likely to have a poor prognosis. The findings of this study suggest that investigating genetic changes, in addition to conventional clinicopathologic factors, may contribute to defining groups of breast cancer patients with differences in prognosis.
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Affiliation(s)
- M Watatani
- First Department of Surgery, Kinki University School of Medicine, Osakasayama, Japan
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24
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Abstract
Cyclin D1 protein plays an important part in regulating the progress of the cell during the G1 phase of the cell cycle. The cyclin D1 gene, CCND1, is amplified in approximately 20% of mammary carcinomas, and the protein is over-expressed in approximately 50% of cases. This has led to intensive study to ascertain whether cyclin D1 is a biological marker in breast cancer; however, the clinical work has produced unexpected results. Work in cell lines and in transgenic mice indicate that CCND1 is a weak oncogene and it was expected that, like c-erbB-2, over-expression of cyclin D1 protein would be associated with a poor prognosis. Early immunohistochemical prognostic studies produced equivocal results but we, and others, have recently shown that strong staining for cyclin D1 is more likely to be seen in well differentiated, estrogen receptor positive carcinomas. Furthermore, we have found that over-expression of cyclin D1 is actually associated with a good outcome, both in terms of prognosis and response to endocrine treatment. Cyclin D1 is frequently over-expressed in ductal carcinoma in situ but not in benign breast disease, including atypical ductal hyperplasia; hence its expression appears to be closely linked with carcinogenesis. In order to help explain the apparent beneficial effects of cyclin D1 over-expression, a number of closely associated cell cycle proteins have also been evaluated, including the cyclin dependent kinase inhibitor p27, which blocks the activating effects of cyclin D1. Initial reports show that high levels of p27 are associated with a good prognosis and we have shown a positive association between p27 and cyclin D1 expression. These clinical results of cyclin D1 are an example of how information obtained from basic cell biology studies needs to be complemented by clinical studies to ascertain the true worth of a prognostic marker.
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Affiliation(s)
- D M Barnes
- Hedley Atkins/ICRF Breast Pathology Laboratory, Guy's Hospital, London, UK.
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25
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Molecular Alterations in Breast Cancer. Breast Cancer 1999. [DOI: 10.1007/978-1-59259-456-6_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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26
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Mommers EC, van Diest PJ, Leonhart AM, Meijer CJ, Baak JP. Expression of proliferation and apoptosis-related proteins in usual ductal hyperplasia of the breast. Hum Pathol 1998; 29:1539-45. [PMID: 9865845 DOI: 10.1016/s0046-8177(98)90028-4] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Expression of proliferation- and apoptosis-related proteins was studied by immunohistochemistry in 130 usual ductal hyperplasias of the breast, of which 39 cases (30%) had adjacent invasive cancer. Overexpression of cyclin D1 and Ki-67 was found in 6% and 29% of the cases, respectively. Only two mild ductal hyperplasias were Her-2/neu positive. Overexpression of p21 and reduced expression of p27, both cdk-inhibitors, was seen in 16% and 27% of the lesions, respectively. Reduced expression of bcl-2 was found in 16% of the cases, and p53 accumulation was present in 8%. Expression of six of the seven studied proteins showed no significant difference between mild, moderate, or florid ductal hyperplasias, indicating that there are no important cell biological differences with regard to the studied proteins between the lesions within this morphologically continuous spectrum. In addition, there were no differences between lesions with and without an invasive component. Cyclin D1 positivity was exclusively seen in lesions with 75% or more p27-positive nuclei. No significant correlations were found between other proteins. Twenty-three of 91 lesions (25%) had multiple events, of which five showed altered expressions of three or four proteins. In conclusion, altered protein expression of several proliferation- and apoptosis-related genes that are known to be involved in invasive breast cancer also may be found in usual ductal hyperplastic lesions, including several lesions with multiple events. This implies that usual ductal hyperplastic lesions may be among the earliest lesions within the breast oncogenetic spectrum.
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Affiliation(s)
- E C Mommers
- Department of Pathology, Free University Hospital, Amsterdam, The Netherlands
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27
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Schuuring E, van Damme H, Schuuring-Scholtes E, Verhoeven E, Michalides R, Geelen E, de Boer C, Brok H, van Buuren V, Kluin P. Characterization of the EMS1 gene and its product, human Cortactin. CELL ADHESION AND COMMUNICATION 1998; 6:185-209. [PMID: 9823470 DOI: 10.3109/15419069809004475] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
We have identified a novel gene, EMS1, that is consistently amplified and overexpressed in human carcinomas with an amplification of the chromosome 11q13 region. Comparisons of the EMS1 sequences with those present in the GenBank databases revealed a high identity with chicken cortactin. Southern and western blot analyses confirm the high sequence conservation during evolution. An antiserum specific for human cortactin, showed in gene transfer experiments that both human p80 and p85 isoforms are encoded by the EMS1 cDNA. Further comparisons demonstrated an high sequence and structural homology with HS1 that is implicated in signal transduction in lymphoid cells only. Expression of EMS1/cortactin mRNA was restricted to tumor cell lines derived from non-lymphoid origin. Cortactin contains (i) a filamentous actin binding tandem repeat domain, (ii) a proline-rich SH3-binding and (iii) a SH3 domain that is common in proteins involved in signal transduction. Our data suggest that human EMS1/cortactin has a function in signal transmission between cell-matrix contact sites and the cytoskeleton and, as such, its overexpression due to 11q13 amplification might effect adhesive properties of human carcinomas.
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MESH Headings
- Animals
- Antibodies
- Base Sequence
- Blotting, Western
- Breast Neoplasms/genetics
- Cell Adhesion/physiology
- Chromosomes, Human, Pair 11
- Cortactin
- Cyclin D1/physiology
- Evolution, Molecular
- Female
- Gene Amplification
- Humans
- Microfilament Proteins/analysis
- Microfilament Proteins/genetics
- Microfilament Proteins/immunology
- Molecular Sequence Data
- Neoplasm Proteins/analysis
- Neoplasm Proteins/genetics
- Neoplasm Proteins/immunology
- RNA, Messenger/analysis
- Rabbits
- Sequence Analysis, DNA
- Sequence Homology, Amino Acid
- Signal Transduction/physiology
- Tumor Cells, Cultured/chemistry
- Tumor Cells, Cultured/cytology
- Tumor Cells, Cultured/physiology
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Affiliation(s)
- E Schuuring
- Department of Pathology, Leiden University Medical Center, The Netherlands.
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28
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Mustafa IA, Bland KI. Physiologic effects of steroid hormones and postmenopausal hormone replacement on the female breast and breast cancer risk. Ann Surg 1998; 228:638-51. [PMID: 9833802 PMCID: PMC1191569 DOI: 10.1097/00000658-199811000-00003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Most data demonstrate that breast cancer is hormonally influenced. For the woman with no history of breast cancer, the benefits of HRT may outweigh the risks. Although it remains the standard of care to discourage hormone use in patients who have had breast cancer, future studies may result in a change of this standard. There needs to be more research into these complex hormonal interactions so that we will have a better understanding of the true risks and benefits when we attempt to advise our patients regarding the best treatment regimens for them.
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Affiliation(s)
- I A Mustafa
- Department of Surgery, Brown University School of Medicine, and Rhode Island Hospital, Providence 02903, USA
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29
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Tanner MM, Karhu RA, Nupponen NN, Borg A, Baldetorp B, Pejovic T, Fernö M, Killander D, Isola JJ. Genetic aberrations in hypodiploid breast cancer: frequent loss of chromosome 4 and amplification of cyclin D1 oncogene. THE AMERICAN JOURNAL OF PATHOLOGY 1998; 153:191-9. [PMID: 9665480 PMCID: PMC1852954 DOI: 10.1016/s0002-9440(10)65560-5] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The evolution of somatic genetic aberrations in breast cancer has remained poorly understood. The most common chromosomal abnormality is hyperdiploidy, which is thought to arise via a transient hypodiploid state. However, hypodiploidy persists in 1 to 2% of breast tumors, which are characterized by a poor prognosis. We studied the genetic aberrations in 15 flow cytometrically hypodiploid breast cancers by comparative genomic hybridization (CGH) and fluorescence in situ hybridization (FISH). Surprisingly, numerous copy number gains were detected in addition to the copy number losses. The number of gains per tumor was 4.3 +/- 3.2 and that of losses was 4.5 +/- 3.3 (mean +/- SD), which is similar to that previously observed in hyperdiploid breast cancers. Gains at chromosomes or chromosomal regions at 11q13, 1q, 19, and 16p and losses of 2q, 4, 6q, 9p, 13, and 18 were most commonly observed. Compared with unselected breast carcinomas, hypodiploid tumors showed certain differences. Loss of chromosome 4 (53%) and gain of 11q13 (60%) were significantly more common in hypodiploid tumors. The gain at 11q13 was found by FISH to harbor amplification of the Cyclin D1 oncogene, which is therefore three to four times more common in hypodiploid than in unselected breast cancers (15 to 20%). Structural chromosomal aberrations (such as Cyclin D1 amplification) were present both in diploid and hypodiploid tumor cell populations, as assessed by FISH and CGH after flow cytometric sorting. Together these results indicate that hypodiploid tumors form a distinct genetic entity of invasive breast cancer, although they probably share a common genetic evolution pathway where structural chromosomal aberrations precede gross DNA ploidy changes.
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Affiliation(s)
- M M Tanner
- Laboratory of Cancer Genetics, University and University Hospital of Tampere, Finland
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30
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Kononen J, Bubendorf L, Kallioniemi A, Bärlund M, Schraml P, Leighton S, Torhorst J, Mihatsch MJ, Sauter G, Kallioniemi OP. Tissue microarrays for high-throughput molecular profiling of tumor specimens. Nat Med 1998; 4:844-7. [PMID: 9662379 DOI: 10.1038/nm0798-844] [Citation(s) in RCA: 2939] [Impact Index Per Article: 113.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Many genes and signalling pathways controlling cell proliferation, death and differentiation, as well as genomic integrity, are involved in cancer development. New techniques, such as serial analysis of gene expression and cDNA microarrays, have enabled measurement of the expression of thousands of genes in a single experiment, revealing many new, potentially important cancer genes. These genome screening tools can comprehensively survey one tumor at a time; however, analysis of hundreds of specimens from patients in different stages of disease is needed to establish the diagnostic, prognostic and therapeutic importance of each of the emerging cancer gene candidates. Here we have developed an array-based high-throughput technique that facilitates gene expression and copy number surveys of very large numbers of tumors. As many as 1000 cylindrical tissue biopsies from individual tumors can be distributed in a single tumor tissue microarray. Sections of the microarray provide targets for parallel in situ detection of DNA, RNA and protein targets in each specimen on the array, and consecutive sections allow the rapid analysis of hundreds of molecular markers in the same set of specimens. Our detection of six gene amplifications as well as p53 and estrogen receptor expression in breast cancer demonstrates the power of this technique for defining new subgroups of tumors.
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Affiliation(s)
- J Kononen
- Laboratory of Cancer Genetics, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892-4470, USA
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31
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Schwartz S, Caceres C, Morote J, De Torres I, Rodriguez-Vallejo JM, Gonzalez J, Reventos J. Over-expression of epidermal growth factor receptor and c-erbB2/neu but not of int-2 genes in benign prostatic hyperplasia by means of semi-quantitative PCR. Int J Cancer 1998; 76:464-7. [PMID: 9590118 DOI: 10.1002/(sici)1097-0215(19980518)76:4<464::aid-ijc3>3.0.co;2-p] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
It is well established that activation of cellular genes may trigger uncontrolled cell growth and cancer development. Previous reports suggest that the epidermal growth factor receptor (EGFr), c-erbB2/neu and int-2, fibroblast growth factor-3, may be implicated in the development of benign prostatic hyperplasia (BPH). Using the polymerase chain reaction technique, we have assessed the amplification and expression of these molecular markers in 30 prostate samples from patients with BPH as well as from 5 normal donors. We detected mRNA over-expression of EGFr and c-erbB2/neu in 36% and 63%, respectively, of the BPH samples, but no gene amplification was found. No amplification or over-expression of int-2 was detected in any of the samples analyzed, suggesting that int-2 is not involved in BPH. Our results thus suggest a role for EGFr and c-erbB2/neu but not for int-2 in the development of BPH.
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Affiliation(s)
- S Schwartz
- Unitat de Recerca Biomèdica, Centre d'Investigacions en Bioquímica i Biologia Molecular, Barcelona, Spain.
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32
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Zrihan-Licht S, Deng B, Yarden Y, McShan G, Keydar I, Avraham H. Csk homologous kinase, a novel signaling molecule, directly associates with the activated ErbB-2 receptor in breast cancer cells and inhibits their proliferation. J Biol Chem 1998; 273:4065-72. [PMID: 9461599 DOI: 10.1074/jbc.273.7.4065] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Substantial evidence exists supporting direct roles for ErbB-2/neu and Src kinase activation in breast cancer. The Csk homologous kinase (CHK) is a recently identified tyrosine kinase which, like Csk, phosphorylates the C-terminal tyrosine of Src kinases, resulting in inactivation of these enzymes. Recently, we observed that CHK is associated with the ErbB-2/neu receptor upon heregulin stimulation of breast cancer cells. Here, we report that CHK expression was observed in 70 out of 80 primary breast cancer specimens but not in normal breast tissues (0/19). Confocal microscopy analysis revealed co-localization of CHK with ErbB-2 in these primary specimens (6/6). In addition, we observed that the cytoplasmic domain of the ErbB-2/neu receptor is sufficient for its interaction with the CHKSH2 domain. Phosphopeptide inhibition of the in vitro interaction of CHKSH2 or native CHK with ErbB-2/neu, as well as site-directed mutagenesis of ErbB-2/neu, indicated that CHKSH2 binds to Tyr1253 of ErbB-2/neu. Interestingly, autophosphorylation at this site confers oncogenicity to this receptor. Moreover, CHK was able to down-regulate ErbB-2/neu-activated Src kinases. Overexpression of CHK in MCF-7 breast cancer cells markedly inhibited cell growth and proliferative response to heregulin as well as decreased colony formation in soft agar. These studies indicate that CHK binds, via its SH2 domain, to Tyr1253 of the activated ErbB-2/neu and down-regulates the ErbB-2/neu-mediated activation of Src kinases, thereby inhibiting breast cancer cell growth. These data strongly suggest that CHK is a novel negative growth regulator in human breast cancer.
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Affiliation(s)
- S Zrihan-Licht
- Division of Experimental Medicine, Beth Israel Deaconess Medical Center, Harvard Institutes of Medicine, Boston, Massachusetts 02115, USA
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33
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Abstract
Neoplasia is characterised by abnormal regulation of the cell cycle. Cyclin D1 is a protein derived from the PRAD1, CCND1 or bcl-1 gene on chromosome 11q13, which is involved in both normal regulation of the cell cycle and neoplasia. In the G1 (resting) phase of the cell cycle, cyclin D1 together with its cyclin dependent kinase (cdk) partner, is responsible for transition to the S (DNA synthesis) phase by phosphorylating the product of the retinoblastoma gene (pRB), which then releases transcription factors important in the initiation of DNA replication. Amplification of the CCND1 gene or overexpression of the cyclin D1 protein releases a cell from its normal controls and causes transformation to a malignant phenotype. Analysis of these changes provides important diagnostic information in mantle cell (and related) lymphomas, and is of prognostic value in many cancers. Knowledge of cyclin D1's role in malignancy at the various sites, provides a basis on which future treatment directed against this molecule can proceed.
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Affiliation(s)
- R Donnellan
- Department of Pathology, University of Natal Medical School, Durban, South Africa.
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34
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Fioravanti L, Cappelletti V, Coradini D, Miodini P, Borsani G, Daidone MG, Di Fronzo G. int-2 oncogene amplification and prognosis in node-negative breast carcinoma. Int J Cancer 1997; 74:620-4. [PMID: 9421359 DOI: 10.1002/(sici)1097-0215(19971219)74:6<620::aid-ijc11>3.0.co;2-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The role of int-2 oncogene amplification on the prognosis of breast cancer patients was investigated in 128 patients with node-negative primary breast cancers given first-line local-regional treatments until relapse and with a median follow-up of 65 months. Tumours had been previously characterised for oestrogen (ER) and progesterone receptor (PgR) status and proliferative activity (3H-thymidine labelling index). Amplification of the int-2 oncogene occurred in 18% of cases and was significantly related to the presence of hormone receptors and to menopausal status or age, but not to proliferative status. Patients with tumours exhibiting int-2 amplification had a lower probability of disease-free survival than patients with non-amplified tumours and frequently developed local-regional recurrence. Disease-free survival analysis, adjusted for the prognostic contribution provided by tumour size, steroid receptors and proliferative rate, indicated that the association between int-2 amplification and risk of relapse was maintained and remained constant even in the presence of the other co-variates. Interestingly, int-2 amplification was a further prognostic discriminant within subsets of patients with a putatively good (i.e., tumour size <20 mm, ER+ and PgR+) or poor prognosis (i.e., high labelling index). Our exploratory study suggests that within node-negative patients, int-2 amplification could be a valuable and independent prognosticator, useful to identify patients at high risk of local-regional recurrence.
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Affiliation(s)
- L Fioravanti
- Istituto Nazionale per lo Studio e la Cura dei Tumori, Milan, Italy
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35
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Neuman E, Ladha MH, Lin N, Upton TM, Miller SJ, DiRenzo J, Pestell RG, Hinds PW, Dowdy SF, Brown M, Ewen ME. Cyclin D1 stimulation of estrogen receptor transcriptional activity independent of cdk4. Mol Cell Biol 1997; 17:5338-47. [PMID: 9271411 PMCID: PMC232384 DOI: 10.1128/mcb.17.9.5338] [Citation(s) in RCA: 283] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Cyclin D1 plays an important role in the development of breast cancer and is required for normal breast cell proliferation and differentiation associated with pregnancy. We show that ectopic expression of cyclin D1 can stimulate the transcriptional activity of the estrogen receptor in the absence of estradiol and that this activity can be inhibited by 4-hydroxytamoxifen and ICI 182,780. Cyclin D1 can form a specific complex with the estrogen receptor. Stimulation of the estrogen receptor by cyclin D1 is independent of cyclin-dependent kinase 4 activation. Cyclin D1 may manifest its oncogenic potential in breast cancer in part through binding to the estrogen receptor and activation of the transcriptional activity of the receptor.
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Affiliation(s)
- E Neuman
- The Dana-Farber Cancer Institute and Harvard Medical School, Boston, Massachusetts 02115, USA
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36
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Masciullo V, Scambia G, Marone M, Giannitelli C, Ferrandina G, Bellacosa A, Benedetti Panici P, Mancuso S. Altered expression of cyclin D1 and CDK4 genes in ovarian carcinomas. Int J Cancer 1997; 74:390-5. [PMID: 9291427 DOI: 10.1002/(sici)1097-0215(19970822)74:4<390::aid-ijc5>3.0.co;2-q] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We analyzed the expression and amplification of cyclin D1 and CDK4 genes in ovarian carcinomas. Northern blot analysis revealed overexpression of cyclin D1 in 12 of 65 (18%) ovarian carcinomas while CDK4 was overexpressed in 7 of 48 cases (14%). None of the tumors showed amplification of any of the 2 genes. Overexpression of cyclin D1 and CDK4 transcripts was correlated, suggesting a role of both genes in altered growth control of ovarian cancer cells. Elevated levels of cyclin D1 were significantly associated with a well-moderately differentiated grade (G1-G2) (p < 0.005). No significant association was found between cyclin D1 expression and estrogen receptor, progesterone and epidermal growth factor receptor content. Cyclin D1 expression does not appear to be associated with clinical outcome in human ovarian cancer, although a longer follow-up period and screening of other molecules involved in the same pathway would be necessary to assess this hypothesis.
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Affiliation(s)
- V Masciullo
- Laboratory of Anti-neoplastic Pharmacology, Zeneca Department of Gynecology and Obstetrics, Catholic University, Rome, Italy
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37
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Abstract
Breast cancer is a heterogeneous disease regarding morphology, invasive behavior, metastatic capacity, hormone receptor expression and clinical outcome. For prediction of prognosis, tumor cell kinetics is an important feature, traditionally evaluated by estimation of cell growth-associated parameters such as mitotic index, S-phase fraction and expression of proliferation coupled proteins, for example proliferating cell nuclear antigen (PCNA) and Ki-67 antigen. Recent data indicate that deregulation of the cell cycle can occur at different levels in cancer and that the "deregulation pattern" can be of clinical significance. In the present overview we give a short description of approaches used for cell proliferation assessments, whereafter more recent data on cell cycle deregulation are discussed. Alterations of importance in breast cancer include overexpression of cyclins D1 and E, down-regulation of cyclin-dependent kinase inhibitors, such as p16, and inactivation of the retinoblastoma and p53 tumor suppressor proteins.
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Affiliation(s)
- G Landberg
- Department of Pathology, Umeå University, Sweden
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38
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Simpson JF, Quan DE, O'Malley F, Odom-Maryon T, Clarke PE. Amplification of CCND1 and expression of its protein product, cyclin D1, in ductal carcinoma in situ of the breast. THE AMERICAN JOURNAL OF PATHOLOGY 1997; 151:161-8. [PMID: 9212742 PMCID: PMC1857915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Ductal carcinoma in situ (DCIS) of the breast is a heterogeneous disease clinically and biologically. The few available studies of its natural history implicate DCIS as a non-obligate precursor for invasive carcinoma. We have used fluorescence in situ hybridization (FISH) to detect gene amplification of the cell cycle regulator gene CCND1 in 88 examples of formalin-fixed, paraffin-embedded DCIS. Expression of its protein product cyclin D1 was detected by immunohistochemistry. CCND1 was amplified in 18% of DCIS cases. High grade DCIS was more likely to show amplification than low grade DCIS (32% versus 8%; P = 0.08). Gene amplification was associated with cyclin D1 protein expression (P = 0.001), although cyclin D1 was detected in cases that did not demonstrate gene amplification. Overall, cyclin D1 protein was detected in 50% of DCIS cases. Although only 2 of 23 (8%) cases of low grade DCIS had CCND1 amplification, over 50% (13/23) of these cases expressed cyclin D1 protein. Low grade DCIS had a higher mean percentage of nuclei expressing cyclin D1 than did intermediate or high grade DCIS (P = 0.007). Mechanisms other than gene amplification may be responsible for increased cyclin D1 protein in DCIS, especially in low grade DCIS. Identifying mechanisms that control cell cycle progression in DCIS may yield clues to its biological behavior.
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Affiliation(s)
- J F Simpson
- Division of Pathology, City of Hope National Medical Center, Duarte, California, USA
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39
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Planas-Silva MD, Weinberg RA. Estrogen-dependent cyclin E-cdk2 activation through p21 redistribution. Mol Cell Biol 1997; 17:4059-69. [PMID: 9199341 PMCID: PMC232259 DOI: 10.1128/mcb.17.7.4059] [Citation(s) in RCA: 190] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
In order to elucidate the mechanisms by which estrogens and antiestrogens modulate the growth of breast cancer cells, we have characterized the changes induced by estradiol that occur during the G1 phase of the cell cycle of MCF-7 human mammary carcinoma cells. Addition of estradiol relieves the cell cycle block created by tamoxifen treatment, leading to marked activation of cyclin E-cdk2 complexes and phosphorylation of the retinoblastoma protein within 6 h. Cyclin D1 levels increase significantly while the levels of cyclin E, cdk2, and the p21 and p27 cdk inhibitors are relatively constant. However, the p21 cdk inhibitor shifts from its association with cyclin E-cdk2 to cyclin D1-cdk4, providing an explanation for the observed activation of the cyclin E-cdk2 complexes. These results support the notion that cyclin D1 has an important role in steroid-dependent cell proliferation and that estrogen, by regulating the activities of G1 cyclin-dependent kinases, can control the proliferation of breast cancer cells.
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Affiliation(s)
- M D Planas-Silva
- Whitehead Institute for Biomedical Research, Cambridge, Massachusetts 02142, USA
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40
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Jares P, Rey MJ, Fernández PL, Campo E, Nadal A, Muñoz M, Mallofré C, Muntané J, Nayach I, Estapé J, Cardesa A. Cyclin D1 and retinoblastoma gene expression in human breast carcinoma: correlation with tumour proliferation and oestrogen receptor status. J Pathol 1997; 182:160-6. [PMID: 9274525 DOI: 10.1002/(sici)1096-9896(199706)182:2<160::aid-path814>3.0.co;2-2] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Cyclin D1 (CCND1) and retinoblastoma (Rb) genes are cell cycle regulators which are altered in some breast carcinomas. However, the possible cooperation between CCND1 and Rb, as well as the influence and coincidence of their abnormalities in the proliferative capacity of mammary carcinoma cells in vivo, is still unknown. In order to assess both the significance of the CCND1 gene and Rb alterations in breast carcinomas and their relationship with the proliferative capacity of the tumours and other clinico-pathological factors, CCND1 mRNA expression was studied in 46 cases of primary breast carcinomas and matched normal tissue, 45 of which were also studied immunohistochemically, Rb expression was analysed in the same cases by immunohistochemistry, whereas the proliferative activity of the carcinoma was evaluated by flow cytometry. CCND1 mRNA was overexpressed in 19 tumours (41 per cent). Sixteen cases showed diffuse immunohistochemical expression, ten carcinomas had few positive cells, and 19 were absolutely negative. CCND1 mRNA and protein overexpression was associated with oestrogen receptor (ER) expression by the tumour. Interestingly, lack of ER expression was associated with a decreased CCND1 mRNA signal in non-overexpressed tumours. No association was observed between CCND1 mRNA or protein overexpression and tumour proliferation or other clinico-pathological parameters. Loss of Rb expression was observed in 26 per cent of the tumours. This abnormality was significantly associated with increased mean S-phase (P = 0.017) and decreased CCND1 mRNA expression in non-overexpressed tumours, supporting in vivo the postulated regulatory loop between Rb and CCND1 in vitro. We conclude that CCND1 up-regulation is not associated with increased proliferative activity in breast carcinomas, whereas its expression might be regulated in vivo by hormones and Rb. Loss of Rb expression is significantly associated with an increased proliferation of tumour cells, suggesting an important role in the progression of a subset of breast carcinomas, regardless of CCND1 abnormalities.
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MESH Headings
- Blotting, Northern
- Breast Neoplasms/genetics
- Breast Neoplasms/metabolism
- Breast Neoplasms/pathology
- Carcinoma/genetics
- Carcinoma/metabolism
- Carcinoma/pathology
- Carcinoma, Ductal, Breast/genetics
- Carcinoma, Ductal, Breast/metabolism
- Carcinoma, Ductal, Breast/pathology
- Carcinoma, Lobular/genetics
- Carcinoma, Lobular/metabolism
- Carcinoma, Lobular/pathology
- Cyclin D1
- Cyclins/genetics
- Flow Cytometry
- Gene Expression
- Genes, Retinoblastoma
- Humans
- Immunohistochemistry
- Oncogene Proteins/genetics
- Receptors, Estrogen/metabolism
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Affiliation(s)
- P Jares
- Department of Basic Medical Sciences, University of Lleida, Spain
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41
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Sheyn I, Noffsinger AE, Heffelfinger S, Davis B, Miller MA, Fenoglio-Preiser CM. Amplification and expression of the cyclin D1 gene in anal and esophageal squamous cell carcinomas. Hum Pathol 1997; 28:270-6. [PMID: 9042789 DOI: 10.1016/s0046-8177(97)90123-4] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Cyclin D1 is a cell-cycle regulator and candidate proto-oncogene implicated in the pathogenesis of numerous tumor types. Amplification of the cyclin D1 gene occurs commonly in esophageal squamous cell carcinomas. However, no studies have examined the role of cyclin D1 in anal carcinogenesis. We examined 20 esophageal squamous cell carcinomas and 24 anal carcinomas for cyclin D1 alterations. Protein expression was evaluated by immunohistochemistry using the cyclin DIGM antibody (Novocastra, Newcastle upon Tyne, UK). Cyclin D1 amplification was examined by fluorescent in situ hybridization (FISH), using a cyclin D1 probe obtained from Toshiya Inaba at St. Jude Children's Research Hospital, Memphis, TN. The FISH sections were analyzed using a Leica (Deerfield, IL) confocal microscope. By immunohistochemistry, 75% of esophageal carcinomas showed evidence of cyclin D1 expression. Cyclin D1 amplification was detected by FISH in 65% of esophageal cancers. There was good correlation between cyclin D1 protein expression and gene amplification, although some tumors showed protein overexpression in the absence of gene amplification. Among the 24 anal carcinomas studied, 8% showed weak cyclin D1 immunoreactivity in rare tumor cells. None of the anal tumors showed cyclin D1 amplification. We conclude that cyclin D1 alterations are common in esophageal carcinomas but do not appear to be important in anal carcinogenesis. Immunohistochemical detection of cyclin D1 protein overexpression is a good predictor of cyclin D1 amplification.
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Affiliation(s)
- I Sheyn
- Department of Pathology, University of Cincinnati, OH 45267-0529, USA
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42
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Shin KY, Kong G, Kim WS, Lee TY, Woo YN, Lee JD. Overexpression of cyclin D1 correlates with early recurrence in superficial bladder cancers. Br J Cancer 1997; 75:1788-92. [PMID: 9192983 PMCID: PMC2223624 DOI: 10.1038/bjc.1997.305] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Cyclin D1 is a cell cycle regulator essential for G1 phase progression and is frequently overexpressed in several human tumour types as a consequence of gene amplification or chromosomal rearrangements. We analysed the expression of cyclin D1 in 75 patients with transitional cell carcinoma (TCC) to investigate the possible relationship between its expression and clinical outcome as well as histopathological findings using the immunohistochemical method. We observed strong staining (++, > 50% positive cells) for cyclin D1 in 19 cases (25.3%) and weak staining (+, 5-50% positive cells) in 19 cases (25.3%). Overexpression of cyclin D1 was not associated with tumour invasion. No significant association was found between overexpression of cyclin D1 and tumour grade (P > 0.05). We assessed the differences of disease-free interval in superficial tumours and actuarial survival probability in invasive tumours according to the status of cyclin D1 expression. Tumours with (++) staining for cyclin D1 recurred much more rapidly than (-) and/or (+) staining tumours (P < 0.01 for - vs ++; P < 0.05 for + vs ++). However, overexpression of cyclin D1 was not associated with a shortened overall survival of patients with invasive tumours (P < 0.1). These results suggest that genetic alteration of cyclin D1 appears to be an early event in the tumorigenesis of bladder TCC and is associated with early recurrence in superficial tumours.
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Affiliation(s)
- K Y Shin
- Department of Urology, College of Medicine, Hanyang University, Seoul, Korea
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43
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Kamalati T, Jolin HE, Mitchell PJ, Barker KT, Jackson LE, Dean CJ, Page MJ, Gusterson BA, Crompton MR. Brk, a breast tumor-derived non-receptor protein-tyrosine kinase, sensitizes mammary epithelial cells to epidermal growth factor. J Biol Chem 1996; 271:30956-63. [PMID: 8940083 DOI: 10.1074/jbc.271.48.30956] [Citation(s) in RCA: 99] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
brk (breast tumor kinase) shows homology to the src family of non-receptor protein-tyrosine kinases and is expressed in breast carcinomas. In order to investigate the role of brk in breast tumor development, we have examined the growth and transformation properties of human mammary epithelial cells engineered to overexpress Brk. Interestingly, like c-Src, overexpression of Brk leads to sensitization to EGF, and also results in a partially transformed phenotype. Further investigation of the latter activity was attempted by mutational analysis, targeting key residues known to affect tyrosine kinase activity in Src-like kinases. Mutation of amino acid residue Lys-219 to Met, by analogy to Src, abolished both kinase activity and transformation capacity. Mutation of amino acid residue Tyr-447 to Phe, however, resulted in a decrease in transforming potential without affecting kinase activity. These results suggest that while Src and Brk share some functional properties, they act differently during transformation. These differences are discussed in the context of the mechanisms underlying breast cancer development.
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Affiliation(s)
- T Kamalati
- Section of Cell Biology and Experimental Pathology, Institute of Cancer Research, Sutton, Surrey, United Kingdom
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44
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Zhang QX, Hilsenbeck SG, Fuqua SA, Borg A. Multiple splicing variants of the estrogen receptor are present in individual human breast tumors. J Steroid Biochem Mol Biol 1996; 59:251-60. [PMID: 9010317 DOI: 10.1016/s0960-0760(96)00120-3] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Transcript variants of the estrogen receptor (ER) were investigated in 109 primary breast tumors using reverse transcription-polymerase chain reaction (RT-PCR) and primers allowing analysis of each internal exon. A high incidence of different ER variants was observed, each individual tumor often manifesting multiple variants coexisting with corresponding wildtype (wt) ER. These variants, by sequence analysis confirmed to represent exon splicing deletions, included ER deltaE2 (found in 41% of the tumors examined), ER deltaE3 (74%), ER deltaE4 (72%), ER deltaE5 (66%), and ER deltaE7 (88%). No evidence of transcripts lacking exon 6 was found, although a ER deltaE5,7 variant manifesting simultaneous deletion of exons 5 and 7 was observed. The presence of specific ER variants was not significantly correlated to the status of ER and progesterone receptor (PgR) protein expression, as assessed by routine analysis, although a trend towards a higher incidence of ER deltaE3 and increased expression of ER deltaE7 in ER+/PgR- tumors was observed, suggesting a dominant inhibitory effect on normal ER function to be involved. Moreover, ER deltaE4 was more common in ER+ tumors, possibly due to a cytoplasmic sequestring of this variant lacking a nuclear localization sequence. The presence of ER variants was not associated to clinicopathological variables, and equally frequent in tumors from patients having recurred or remained recurrence-free during adjuvant tamoxifen therapy. In conclusion, although ER splicing variants are abundant in breast cancer, the present study provides no evidence for a direct role of these ER variants in tumor development and tamoxifen resistance. It remains possible, however, that minor cell clones within the tumor, undetected by analysis of tumor homogenates, displaying extreme difference in content of ER variants, could be selected for during therapy or metastasis.
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MESH Headings
- Adult
- Aged
- Aged, 80 and over
- Alternative Splicing
- Antineoplastic Agents, Hormonal/therapeutic use
- Breast Neoplasms/chemistry
- Breast Neoplasms/drug therapy
- Breast Neoplasms/genetics
- Disease-Free Survival
- Drug Resistance, Neoplasm
- Gene Expression Regulation, Neoplastic
- Humans
- Middle Aged
- RNA, Messenger/analysis
- RNA, Messenger/genetics
- RNA, Neoplasm/analysis
- RNA, Neoplasm/genetics
- Receptors, Estrogen/analysis
- Receptors, Estrogen/genetics
- Receptors, Progesterone/analysis
- Receptors, Progesterone/genetics
- Recurrence
- Tamoxifen/therapeutic use
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Affiliation(s)
- Q X Zhang
- Department of Oncology, University Hospital, Lund, Sweden
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45
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Deng G, Yu M, Chen LC, Moore D, Kurisu W, Kallioniemi A, Waldman FM, Collins C, Smith HS. Amplifications of oncogene erbB-2 and chromosome 20q in breast cancer determined by differentially competitive polymerase chain reaction. Breast Cancer Res Treat 1996; 40:271-81. [PMID: 8883970 DOI: 10.1007/bf01806816] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A new method of measuring gene copy number in small samples of DNA was used to measure amplification of the erbB-2 gene and of chromosome 20q in breast cancer. This method, termed 'differentially competitive polymerase chain reaction' (DC-PCR) combines the advantages of two other techniques for measuring amplification by PCR, namely differential PCR and competitive PCR. The DC-PCR methodology was evaluated for sensitivity and specificity by comparing amplification of erbB-2 measured by DC-PCR with that obtained by fluorescence in situ hybridization (FISH) for 42 cases or Southern blotting and/or slot blot analysis for 34 cases. There was over 90 percent concordance with both FISH and Southern blotting and/or slot blot analysis. DC-PCR was used to further characterize the newly described amplicon at chromosome 20q. By analyzing DNA from 10 breast cancer cell lines at 7 different loci, we identified a potential common region of amplification of approximately 5 centimorgans at chromosome 20q13 bordered by loci D20S52 and RMC20C100-S1. One hundred and seventeen cases of primary breast cancer were evaluated for amplification at these two loci. Amplification at one or more loci, defined as > 1.5 fold higher copy number than that of normal DNA, was found in 25 cases (21%). Sixteen cases were amplified at only one of the two probes (12 cases for RMC20C001-S1 and 4 cases for D20S52), suggesting that the target gene lies between the two markers or that there are two independent target genes within a small chromosome region.
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Affiliation(s)
- G Deng
- Geraldine Brush Cancer Research Institute at California Pacific Medical Center, San Francisco 94115, USA
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46
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Uchimaru K, Endo K, Fujinuma H, Zukerberg L, Arnold A, Motokura T. Oncogenic collaboration of the cyclin D1 (PRAD1, bcl-1) gene with a mutated p53 and an activated ras oncogene in neoplastic transformation. Jpn J Cancer Res 1996; 87:459-65. [PMID: 8641982 PMCID: PMC5921129 DOI: 10.1111/j.1349-7006.1996.tb00246.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Cyclin D1 is one of the key regulators in G1 progression in the cell cycle and is also a candidate oncogene (termed PRAD1 or bcl-1) in several types of human tumors. We report a collaboration of the cyclin D1 gene with ras and a mutated form of p53 (p53-mt) in neoplastic transformation. Transfection of cyclin D1 alone or in combination with ras or with p53-mt was not sufficient for focus formation of rat embryonic fibroblasts. However, focus formation induced by co-transfection of ras and p53-mt was enhanced in the presence of the cyclin D1-expression plasmid. Co-transfection of ras- and p53-mt-transformants with the cyclin D1-expression plasmid resulted in reduced serum dependency in vitro. Furthermore, the transformants expressing exogenous cyclin D1 grew faster than those without the cyclin D1 plasmid when injected into nude mice. These observations strengthen the significance of cyclin D1 overexpression through gene rearrangement or gene amplification observed in human tumors as a step in multistep oncogenesis; deregulated expression of cyclin D1 may reduce the requirement for growth factors and may stimulate in vivo growth.
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Affiliation(s)
- K Uchimaru
- Fourth Department of Internal Medicine, University of Tokyo, School of Medicine, Japan
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47
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Abstract
Recent advances in the understanding of cell cycle control by cyclins and cyclin-dependent kinases provide a basis for delineating the molecular mechanisms of proliferation control by steroids and the development and progression of hormone-dependent cancers. Cyclin D1 is necessary, rate-limiting and sufficient for G1 progression in breast cancer cells and regulation of cyclin D1 expression or function is an early response to steroid and steroid antagonist regulation of proliferation. The cyclin D1 gene is amplified in approximately 15%, and its product overexpressed in 40-50%, of primary breast carcinomas. The strong evidence that cyclin D1 plays a major role in cell cycle control in breast epithelial cells suggests that its deregulated expression may have effects on disease progression and phenotype including sensitivity to endocrine therapies.
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Affiliation(s)
- E A Musgrove
- Cancer Biology Division, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, NSW, Australia
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48
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Slovak ML, Wolman SR. Breast Cancer Cytogenetics: Clues to Genetic Complexity of the Disease. Breast J 1996. [DOI: 10.1111/j.1524-4741.1996.tb00084.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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49
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Michalides R, Hageman P, van Tinteren H, Houben L, Wientjens E, Klompmaker R, Peterse J. A clinicopathological study on overexpression of cyclin D1 and of p53 in a series of 248 patients with operable breast cancer. Br J Cancer 1996; 73:728-34. [PMID: 8611372 PMCID: PMC2074376 DOI: 10.1038/bjc.1996.128] [Citation(s) in RCA: 124] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Overexpression of cyclin D1 is frequently found in various types of human tumours and results from clonal rearrangement and/or amplification involving chromosomal region 11q13. In order to evaluate the pathological relevance of cyclin D1 overexpression in human breast cancer, we generated a polyclonal antiserum against the carboxy-terminal part of the cyclin D1 protein. After affinity purification, the antiserum specifically detected overexpression of cyclin D1 in formalin-fixed, paraffin-embedded tumour material also. The intensity of the nuclear stainings was, in general, proportional to the degree of cyclin D1 amplification. We did not encounter significant variability of staining within individual tumours with overexpression of cyclin D1. Overexpression of cyclin D1 appeared to be associated with oestrogen receptor-positive breast tumours, but not with any other clinicopathological parameter tested. Overexpression of cyclin D1 was not prognostic value for recurrence of survival in a consecutive series of 248 operable breast cancer patients (stage I and II). Overexpression of p53 was also not of prognostic significance in this series, but was associated with undifferentiated histology and oestrogen receptor-negative breast tumours, as has been reported previously by others. A high proportion of breast tumours with a low grade of malignancy in this series of operable breast cancer patients may explain discrepancies concerning the prognostic value of amplification and of overexpression of cyclin D1.
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Affiliation(s)
- R Michalides
- Department of Tumour Biology, The Netherlands Cancer Institute, Amsterdam
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50
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