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Breast Cancer Research: BCR

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https://www.readbyqxmd.com/read/29316957/evaluating-the-breast-cancer-predisposition-role-of-rare-variants-in-genes-associated-with-low-penetrance-breast-cancer-risk-snps
#1
Na Li, Simone M Rowley, Ella R Thompson, Simone McInerny, Lisa Devereux, Kaushalya C Amarasinghe, Magnus Zethoven, Richard Lupat, David Goode, Jason Li, Alison H Trainer, Kylie L Gorringe, Paul A James, Ian G Campbell
BACKGROUND: Genome-wide association studies (GWASs) have identified numerous single-nucleotide polymorphisms (SNPs) associated with small increases in breast cancer risk. Studies to date suggest that some SNPs alter the expression of the associated genes, which potentially mediates risk modification. On this basis, we hypothesised that some of these genes may be enriched for rare coding variants associated with a higher breast cancer risk. METHODS: The coding regions and exon-intron boundaries of 56 genes that have either been proposed by GWASs to be the regulatory targets of the SNPs and/or located < 500 kb from the risk SNPs were sequenced in index cases from 1043 familial breast cancer families that previously had negative test results for BRCA1 and BRCA2 mutations and 944 population-matched cancer-free control participants from an Australian population...
January 9, 2018: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29291743/snps-related-to-vitamin-d-and-breast-cancer-risk-a-case-control-study
#2
Linnea Huss, Salma Tunå Butt, Peter Almgren, Signe Borgquist, Jasmine Brandt, Asta Försti, Olle Melander, Jonas Manjer
BACKGROUND: It has been suggested that vitamin D might protect from breast cancer, although studies on levels of vitamin D in association with breast cancer have been inconsistent. Genome-wide association studies (GWASs) have identified several single-nucleotide polymorphisms (SNPs) to be associated with vitamin D. The aim of this study was to investigate such vitamin D-SNP associations in relation to subsequent breast cancer risk. A first step included verification of these SNPs as determinants of vitamin D levels...
January 2, 2018: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29291741/identifying-biomarkers-of-breast-cancer-micrometastatic-disease-in-bone-marrow-using-a-patient-derived-xenograft-mouse-model
#3
Sreeraj G Pillai, Shunqiang Li, Chidananda M Siddappa, Matthew J Ellis, Mark A Watson, Rebecca Aft
BACKGROUND: Disseminated tumor cells (DTCs) found in the bone marrow (BM) of patients with breast cancer portend a poor prognosis and are thought to be intermediaries in the metastatic process. To assess the clinical relevance of a mouse model for identifying possible prognostic and predictive biomarkers of these cells, we have employed patient-derived xenografts (PDX) for propagating and molecularly profiling human DTCs. METHODS: Previously developed mouse xenografts from five breast cancer patients were further passaged by implantation into NOD/SCID mouse mammary fat pads...
January 2, 2018: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29273074/use-of-prescription-drugs-and-risk-of-postoperative-red-blood-cell-transfusion-in-breast-cancer-patients-a-danish-population-based-cohort-study
#4
Anne Marie L Thomsen, Alma B Pedersen, Nickolaj R Kristensen, Bjarne Kuno Møller, Christian Erikstrup, Peer M Christiansen, Mette Nørgaard, Deirdre Cronin-Fenton
BACKGROUND: Several frequently used prescription drugs may affect bleeding risk. We investigated use of aspirin, nonsteroidal anti-inflammatory drugs (NSAIDs), selective serotonin reuptake inhibitors (SSRIs), and statins and risk of postoperative red blood cell transfusion in breast cancer patients. METHODS: Using Danish population-based registries, we identified a cohort of women who underwent surgery for primary breast cancer (n = 22,238) during 2005-2012 and ascertained their use of aspirin, NSAIDs, SSRIs, and statins...
December 22, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29258605/mir-105-93-3p-promotes-chemoresistance-and-circulating-mir-105-93-3p-acts-as-a-diagnostic-biomarker-for-triple-negative-breast-cancer
#5
Hao-Yi Li, Jui-Lin Liang, Yao-Lung Kuo, Hao-Hsien Lee, Marcus J Calkins, Hong-Tai Chang, Forn-Chia Lin, Yu-Chia Chen, Tai-I Hsu, Michael Hsiao, Luo-Ping Ger, Pei-Jung Lu
BACKGROUND: Triple negative breast cancer (TNBC) lacks both early detection biomarkers and viable targeted therapeutics. Moreover, chemotherapy only produces 20-30% pathologic complete response. Because miRNAs are frequently dysregulated in breast cancer and have broad tissue effects, individual or combinations of circulating miRNAs may serve as ideal diagnostic, predictive or prognostic biomarkers, as well as therapeutic targets. Understanding the role and mechanism of dysregulated miRNAs in TNBC may help to develop novel diagnostic and prognostic strategy for TNBC patients...
December 19, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29258587/association-between-mammographic-breast-density-and-histologic-features-of-benign-breast-disease
#6
Karthik Ghosh, Robert A Vierkant, Ryan D Frank, Stacey Winham, Daniel W Visscher, Vernon S Pankratz, Christopher G Scott, Kathleen Brandt, Mark E Sherman, Derek C Radisky, Marlene H Frost, Lynn C Hartmann, Amy C Degnim, Celine M Vachon
BACKGROUND: Over 40% of women undergoing breast screening have mammographically dense breasts. Elevated mammographic breast density (MBD) is an established breast cancer risk factor and is known to mask tumors within the dense tissue. However, the association of MBD with high risk benign breast disease (BBD) is unknown. METHOD: We analyzed data for 3400 women diagnosed with pathologically confirmed BBD in the Mayo Clinic BBD cohort from 1985-2001, with a clinical MBD measure (either parenchymal pattern (PP) or Breast Imaging Reporting and Data Systems (BI-RADS) density) and expert pathology review...
December 19, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29233185/phosphoproteomics-reveals-network-rewiring-to-a-pro-adhesion-state-in-annexin-1-deficient-mammary-epithelial-cells
#7
Asfa Alli-Shaik, Sheena Wee, Lina H K Lim, Jayantha Gunaratne
BACKGROUND: Annexin-1 (ANXA1) plays pivotal roles in regulating various physiological processes including inflammation, proliferation and apoptosis, and deregulation of ANXA1 functions has been associated with tumorigenesis and metastasis events in several types of cancer. Though ANXA1 levels correlate with breast cancer disease status and outcome, its distinct functional involvement in breast cancer initiation and progression remains unclear. We hypothesized that ANXA1-responsive kinase signaling alteration and associated phosphorylation signaling underlie early events in breast cancer initiation events and hence profiled ANXA1-dependent phosphorylation changes in mammary gland epithelial cells...
December 12, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29228969/race-associated-biological-differences-among-luminal-a-and-basal-like-breast-cancers-in-the-carolina-breast-cancer-study
#8
Humberto Parada, Xuezheng Sun, Jodie M Fleming, ClarLynda R Williams-DeVane, Erin L Kirk, Linnea T Olsson, Charles M Perou, Andrew F Olshan, Melissa A Troester
BACKGROUND: We examined racial differences in the expression of eight genes and their associations with risk of recurrence among 478 white and 495 black women who participated in the Carolina Breast Cancer Study Phase 3. METHODS: Breast tumor samples were analyzed for PAM50 subtype and for eight genes previously found to be differentially expressed by race and associated with breast cancer survival: ACOX2, MUC1, FAM177A1, GSTT2, PSPH, PSPHL, SQLE, and TYMS. The expression of these genes according to race was assessed using linear regression and each gene was evaluated in association with recurrence using Cox regression...
December 11, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29212525/establishing-and-characterizing-patient-derived-xenografts-using-pre-chemotherapy-percutaneous-biopsy-and-post-chemotherapy-surgical-samples-from-a-prospective-neoadjuvant-breast-cancer-study
#9
Jia Yu, Bo Qin, Ann M Moyer, Jason P Sinnwell, Kevin J Thompson, John A Copland, Laura A Marlow, James L Miller, Ping Yin, Bowen Gao, Katherine Minter-Dykhouse, Xiaojia Tang, Sarah A McLaughlin, Alvaro Moreno-Aspitia, Anthony Schweitzer, Yan Lu, Jason Hubbard, Donald W Northfelt, Richard J Gray, Katie Hunt, Amy L Conners, Vera J Suman, Krishna R Kalari, James N Ingle, Zhenkun Lou, Daniel W Visscher, Richard Weinshilboum, Judy C Boughey, Matthew P Goetz, Liewei Wang
BACKGROUND: Patient-derived xenografts (PDXs) are increasingly used in cancer research as a tool to inform cancer biology and drug response. Most available breast cancer PDXs have been generated in the metastatic setting. However, in the setting of operable breast cancer, PDX models both sensitive and resistant to chemotherapy are needed for drug development and prospective data are lacking regarding the clinical and molecular characteristics associated with PDX take rate in this setting...
December 6, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29212519/gper-mediates-the-angiocrine-actions-induced-by-igf1-through-the-hif-1%C3%AE-vegf-pathway-in-the-breast-tumor-microenvironment
#10
Ernestina M De Francesco, Andrew H Sims, Marcello Maggiolini, Federica Sotgia, Michael P Lisanti, Robert B Clarke
BACKGROUND: The G protein estrogen receptor GPER/GPR30 mediates estrogen action in breast cancer cells as well as in breast cancer-associated fibroblasts (CAFs), which are key components of microenvironment driving tumor progression. GPER is a transcriptional target of hypoxia inducible factor 1 alpha (HIF-1α) and activates VEGF expression and angiogenesis in hypoxic breast tumor microenvironment. Furthermore, IGF1/IGF1R signaling, which has angiogenic effects, has been shown to activate GPER in breast cancer cells...
December 6, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29187227/obesity-reversibly-depletes-the-basal-cell-population-and-enhances-mammary-epithelial-cell-estrogen-receptor-alpha-expression-and-progenitor-activity
#11
Tamara Chamberlin, Joseph V D'Amato, Lisa M Arendt
BACKGROUND: Obesity is correlated with an increased risk for developing postmenopausal breast cancer. Since obesity rates continue to rise worldwide, it is important to understand how the obese microenvironment influences normal mammary tissue to increase breast cancer risk. We hypothesized that obesity increases the proportion of luminal progenitor cells, which are thought to be the cells of origin for the most common types of breast cancer, potentially leading to an increased risk for breast cancer...
November 29, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29183390/serum-concentrations-of-active-tamoxifen-metabolites-predict-long-term-survival-in-adjuvantly-treated-breast-cancer-patients
#12
Thomas Helland, Nina Henne, Ersilia Bifulco, Bjørn Naume, Elin Borgen, Vessela N Kristensen, Jan T Kvaløy, Timothy L Lash, Grethe I G Alnæs, Ron H van Schaik, Emiel A M Janssen, Steinar Hustad, Ernst A Lien, Gunnar Mellgren, Håvard Søiland
BACKGROUND: Controversies exist as to whether the genetic polymorphisms of the enzymes responsible for the metabolism of tamoxifen can predict breast cancer outcome in patients using adjuvant tamoxifen. Direct measurement of concentrations of active tamoxifen metabolites in serum may be a more biological plausible and robust approach. We have investigated the association between CYP2D6 genotypes, serum concentrations of active tamoxifen metabolites, and long-term outcome in tamoxifen treated breast cancer patients...
November 28, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29183387/nanopore-sequencing-of-full-length-brca1-mrna-transcripts-reveals-co-occurrence-of-known-exon-skipping-events
#13
Lucy C de Jong, Simone Cree, Vanessa Lattimore, George A R Wiggins, Amanda B Spurdle, Allison Miller, Martin A Kennedy, Logan C Walker
BACKGROUND: Laboratory assays evaluating the effect of DNA sequence variants on BRCA1 mRNA splicing may contribute to classification by providing molecular evidence. However, our knowledge of normal and aberrant BRCA1 splicing events to date has been limited to data derived from assays targeting partial transcript sequences. This study explored the utility of nanopore sequencing to examine whole BRCA1 mRNA transcripts and to provide accurate categorisation of in-frame and out-of-frame splicing events...
November 28, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29183348/influence-of-breast-compression-pressure-on-the-performance-of-population-based-mammography-screening
#14
Katharina Holland, Ioannis Sechopoulos, Ritse M Mann, Gerard J den Heeten, Carla H van Gils, Nico Karssemeijer
BACKGROUND: In mammography, breast compression is applied to reduce the thickness of the breast. While it is widely accepted that firm breast compression is needed to ensure acceptable image quality, guidelines remain vague about how much compression should be applied during mammogram acquisition. A quantitative parameter indicating the desirable amount of compression is not available. Consequently, little is known about the relationship between the amount of breast compression and breast cancer detectability...
November 28, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29169389/residential-particulate-matter-and-distance-to-roadways-in-relation-to-mammographic-density-results-from-the-nurses-health-studies
#15
Natalie C DuPre, Jaime E Hart, Kimberly A Bertrand, Peter Kraft, Francine Laden, Rulla M Tamimi
BACKGROUND: High mammographic density is a strong, well-established breast cancer risk factor. Three studies conducted in various smaller geographic settings reported inconsistent findings between air pollution and mammographic density. We assessed whether particulate matter (PM) exposures (PM2.5, PM2.5-10, and PM10) and distance to roadways were associated with mammographic density among women residing across the United States. METHODS: The Nurses' Health Studies are prospective cohorts for whom a subset has screening mammograms from the 1990s (interquartile range 1990-1999)...
November 23, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29162146/smoking-and-risk-of-breast-cancer-in-the-generations-study-cohort
#16
Michael E Jones, Minouk J Schoemaker, Lauren B Wright, Alan Ashworth, Anthony J Swerdlow
BACKGROUND: Plausible biological reasons exist regarding why smoking could affect breast cancer risk, but epidemiological evidence is inconsistent. METHODS: We used serial questionnaire information from the Generations Study cohort (United Kingdom) to estimate HRs for breast cancer in relation to smoking adjusted for potentially confounding factors, including alcohol intake. RESULTS: Among 102,927 women recruited 2003-2013, with an average of 7...
November 22, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29162134/serum-thymidine-kinase-1-activity-as-a-pharmacodynamic-marker-of-cyclin-dependent-kinase-4-6-inhibition-in-patients-with-early-stage-breast-cancer-receiving-neoadjuvant-palbociclib
#17
Nusayba Bagegni, Shana Thomas, Ning Liu, Jingqin Luo, Jeremy Hoog, Donald W Northfelt, Matthew P Goetz, Andres Forero, Mattias Bergqvist, Jakob Karen, Magnus Neumüller, Edward M Suh, Zhanfang Guo, Kiran Vij, Souzan Sanati, Matthew Ellis, Cynthia X Ma
BACKGROUND: Thymidine kinase 1 (TK1) is a cell cycle-regulated enzyme with peak expression in the S phase during DNA synthesis, and it is an attractive biomarker of cell proliferation. Serum TK1 activity has demonstrated prognostic value in patients with early-stage breast cancer. Because cyclin-dependent kinase 4/6 (CDK4/6) inhibitors prevent G1/S transition, we hypothesized that serum TK1 could be a biomarker for CDK4/6 inhibitors. We examined the drug-induced change in serum TK1 as well as its correlation with change in tumor Ki-67 levels in patients enrolled in the NeoPalAna trial (ClinicalTrials...
November 21, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29145865/the-endonuclease-eepd1-mediates-synthetic-lethality-in-rad52-depleted-brca1-mutant-breast-cancer-cells
#18
Robert Hromas, Hyun-Suk Kim, Gurjit Sidhu, Elizabeth Williamson, Aruna Jaiswal, Taylor A Totterdale, Jocelyn Nole, Suk-Hee Lee, Jac A Nickoloff, Kimi Y Kong
BACKGROUND: Proper repair and restart of stressed replication forks requires intact homologous recombination (HR). HR at stressed replication forks can be initiated by the 5' endonuclease EEPD1, which cleaves the stalled replication fork. Inherited or acquired defects in HR, such as mutations in breast cancer susceptibility protein-1 (BRCA1) or BRCA2, predispose to cancer, including breast and ovarian cancers. In order for these HR-deficient tumor cells to proliferate, they become addicted to a bypass replication fork repair pathway mediated by radiation repair protein 52 (RAD52)...
November 16, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29141657/local-estrogen-axis-in-the-human-bone-microenvironment-regulates-estrogen%C3%A2-receptor-positive%C3%A2-breast-cancer-cells
#19
Derek F Amanatullah, John S Tamaresis, Pauline Chu, Michael H Bachmann, Nhat M Hoang, Deborah Collyar, Aaron T Mayer, Robert B West, William J Maloney, Christopher H Contag, Bonnie L King
BACKGROUND: Approximately 70% of all breast cancers express the estrogen receptor, and are regulated by estrogen. While the ovaries are the primary source of estrogen in premenopausal women, most breast cancer is diagnosed following menopause, when systemic levels of this hormone decline. Estrogen production from androgen precursors is catalyzed by the aromatase enzyme. Although aromatase expression and local estrogen production in breast adipose tissue have been implicated in the development of primary breast cancer, the source of estrogen involved in the regulation of estrogen receptor-positive (ER+) metastatic breast cancer progression is less clear...
November 15, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29137653/prognostic-value-of-pam50-and-risk-of-recurrence-score-in-patients-with-early-stage-breast-cancer-with-long-term-follow-up
#20
Hege O Ohnstad, Elin Borgen, Ragnhild S Falk, Tonje G Lien, Marit Aaserud, My Anh T Sveli, Jon A Kyte, Vessela N Kristensen, Gry A Geitvik, Ellen Schlichting, Erik A Wist, Therese Sørlie, Hege G Russnes, Bjørn Naume
BACKGROUND: The aim of this study was to investigate the prognostic value of the PAM50 intrinsic subtypes and risk of recurrence (ROR) score in patients with early breast cancer and long-term follow-up. A special focus was placed on hormone receptor-positive/human epidermal growth factor receptor 2-negative (HR+/HER2-) pN0 patients not treated with chemotherapy. METHODS: Patients with early breast cancer (n = 653) enrolled in the observational Oslo1 study (1995-1998) were followed for distant recurrence and breast cancer death...
November 14, 2017: Breast Cancer Research: BCR
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