1,096,447 research outputs found

    Identification of signaling pathways in early mammary gland development by mouse genetics

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    The mammary gland develops as an appendage of the ectoderm. The prenatal stage of mammary development is hormone independent and is regulated by sequential and reciprocal signaling between the epithelium and the mesenchyme. A number of recent studies using human and mouse genetics, in particular targeted gene deletion and transgenic expression, have identified some of the signals that control specific steps in development. This process involves cell specification and proliferation, reciprocal tissue interactions and cell migration. Since some of these events are recapitulated during tumorigenesis, an understanding of these signaling pathways may contribute to the development of targeted therapies and novel drugs

    Breast cysts and aluminium-based antiperspirant salts

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    On the basis that aluminium-based antiperspirant salts are designed to block apocrine sweat ducts of the axilla, and that breast cysts result from blocked breast ducts in the adjacent region of the body, it has been proposed that breast cysts may arise from antiperspirant use if sufficient aluminium is absorbed into breast tissues over long-term usage. This review collates evidence that aluminium can be absorbed from dermal application of antiperspirant salts and describes studies measuring levels of aluminium in breast tissues, including in breast cyst fluids. It is notable that breast cysts, as for breast cancers, start most frequently in the upper outer quadrant of the breast, which is the region closest to the site of underarm antiperspirant application. Mechanistic evidence is reviewed for a link between aluminium levels in breast tissue, cyst formation and development of breast cancer. If excessive use of antiperspirant is a cause of breast cysts, then reduction or cessation of use could provide a preventative or even treatment strategy. Furthermore, if cyst formation from antiperspirant use is an indicator of increased risk for breast cancer, then reduction in use of antiperspirant could also provide a strategy for reducing breast cancer risk

    Breast support garments are ineffective at reducing breast motion during an aqua aerobics jumping exercise

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    The buoyant forces of water during aquatic exercise may provide a form of ‘natural’ breast support and help to minimise breast motion and alleviate exercise induced breast pain. Six larger-breasted females performed standing vertical land and water-based jumps, whilst wearing three breast support conditions. Underwater video cameras recorded the motion of the trunk and right breast. Trunk and relative breast kinematics were calculated as well as exercised induced breast pain scores. Key results showed that the swimsuit and sports bra were able to significantly reduce the superioinferior breast range of motion by 0.04 and 0.05 m, respectively, and peak velocity by 0.23 and 0.33 m/s, respectively, during land-based jumping when compared to the bare-breasted condition, but were ineffective at reducing breast kinematics during water-based jumping. Furthermore, the magnitude of the swimsuit superioinferior breast range of motion during water-based jumping was significantly greater than land-based jumping (0.13 m and 0.06 m), yet there were no significant differences in exercise induced breast pain, thus contradicting previously published relationships between these parameters on land. Furthermore, the addition of an external breast support garment was able to reduce breast kinematics on land but not in water, suggesting the swimsuit and sports bras were ineffective and improvements in swimwear breast support garments may help to reduce excessive breast motion during aqua aerobic jumping exercises

    A family history of breast cancer will not predict female early onset breast cancer in a population-based setting

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    ABSTRACT: BACKGROUND: An increased risk of breast cancer for relatives of breast cancer patients has been demonstrated in many studies, and having a relative diagnosed with breast cancer at an early age is an indication for breast cancer screening. This indication has been derived from estimates based on data from cancer-prone families or from BRCA1/2 mutation families, and might be biased because BRCA1/2 mutations explain only a small proportion of the familial clustering of breast cancer. The aim of the current study was to determine the predictive value of a family history of cancer with regard to early onset of female breast cancer in a population based setting. METHODS: An unselected sample of 1,987 women with and without breast cancer was studied with regard to the age of diagnosis of breast cancer. RESULTS: The risk of early-onset breast cancer was increased when there were: (1) at least 2 cases of female breast cancer in first-degree relatives (yes/no; HR at age 30: 3.09; 95% CI: 128-7.44), (2) at least 2 cases of female breast cancer in first or second-degree relatives under the age of 50 (yes/no; HR at age 30: 3.36; 95% CI: 1.12-10.08), (3) at least 1 case of female breast cancer under the age of 40 in a first- or second-degree relative (yes/no; HR at age 30: 2.06; 95% CI: 0.83-5.12) and (4) any case of bilateral breast cancer (yes/no; HR at age 30: 3.47; 95%: 1.33-9.05). The positive predictive value of having 2 or more of these characteristics was 13% for breast cancer before the age of 70, 11% for breast cancer before the age of 50, and 1% for breast cancer before the age of 30. CONCLUSION: Applying family history related criteria in an unselected population could result in the screening of many women who will not develop breast cancer at an early age

    A Novel Mechanism for CTCF in the Epigenetic Regulation of Bax in Breast Cancer Cells

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    Wepreviously reported the association of elevated levels of themultifunctional transcription factor, CCCTC binding factor (CTCF), in breast cancer cells with the specific anti-apoptotic function of CTCF. To understand the molecularmechanisms of this phenomenon, we investigated regulation of the human Bax gene by CTCF in breast and non-breast cells. Two CTCF binding sites (CTSs) within the Bax promoter were identified. In all cells, breast and non-breast, active histone modifications were present at these CTSs, DNA harboring this region was unmethylated, and levels of Bax mRNA and protein were similar. Nevertheless, up-regulation of Bax mRNA and protein and apoptotic cell deathwere observed only in breast cancer cells depleted of CTCF.We proposed that increased CTCF binding to the Bax promoter in breast cancer cells, by comparison with non-breast cells, may be mechanistically linked to the specific apoptotic phenotype in CTCF-depleted breast cancer cells. In this study, we show that CTCF binding was enriched at the Bax CTSs in breast cancer cells and tumors; in contrast, binding of other transcription factors (SP1,WT1, EGR1, and c-Myc) was generally increased in non- breast cells and normal breast tissues. Our findings suggest a novel mechanism for CTCF in the epigenetic regulation of Bax in breast cancer cells, whereby elevated levels of CTCF support preferential binding of CTCF to the Bax CTSs. In this context, CTCF functions as a transcriptional repressor counteracting influences of positive regulatory factors; depletion of breast cancer cells from CTCF therefore results in the activation of Bax and apoptosis. © 2013 Neoplasia Press, Inc

    Unique Breast Cancer Features Within the Vietnamese Population

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    BACKGROUND: Breast cancer is known to be a heterogeneous disease across women, and even within individual tumors. However, relatively little is known about heterogeneity across cultures. There has been some evidence to suggest that Asian women are more likely to have HER2+ breast cancer than their Caucasian counterparts. PURPOSE: The aim of this study was to further investigate the unique pattern of breast cancer incidence and subtype in the Vietnamese population. METHODS: We retrospectively collected data on all Vietnamese women diagnosed with invasive breast cancer at the Lester & Sue Smith Breast Center in Houston, Texas over a four year period. We recorded the subtype of breast cancer, tumor grade, age at diagnosis, and menopausal status for each woman. We then compared these characteristics between our population of Vietnamese breast cancer patients, and an ethnically diverse group of American women from the 2010 SEER registry. RESULTS: We discovered that 15 of 33 Vietnamese patients diagnosed in our breast center had HER2 over-expressing breast cancer, resulting in a 45% rate of HER2 positivity. Compared with the 2010 Surveillance, Epidemiology, and End Results (SEER) registry data that encompasses 28% of all US breast cancer patients diagnosed that year, regardless of race, the Smith Clinic Vietnamese cohort had a statistically significant higher rate of HER2+ breast cancer, with an odds ratio of 4.7 (45% vs. 15%, p CONCLUSIONS: Vietnamese breast cancer patients, especially those older than 50 years old, tend to have higher rates of HER2+ breast cancer than the general population. This unique pattern of breast cancer merits further study, as it may reflect a genetic mutation or environmental exposure which is more common among Vietnamese women

    Exploring factors contributing to low uptake of the NHS Breast Cancer Screening Programme among Black African women in the UK

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    Breast cancer is the most common cancer among women in the United Kingdom (UK) accounting for about 15% of cancer deaths. The National Breast Cancer Screening Programme in the UK was introduced in 1988 to assist with early detection and better management of breast cancer. Black and Minority Ethnic (BME) women however have a low uptake of the National Breast Screening programme when compared to their White counterparts. Within the BME group, Black African women have the lowest uptake of screening services and are more likely to have an advanced stage of the disease at diagnosis, leading to poorer survival rates than White women. This study aimed to explore the factors that lead to low uptake of the National Breast Cancer Screening Programme  among Black African women living in Luton and present action points to local breast cancer services. Using a qualitative research design, six focus groups were conducted with a total of twenty-five Black African women residing in Luton between May and June in 2013. Data was analysed thematically using the framework approach. Four main themes emerged across the focus group discussions: knowledge and beliefs about breast cancer and risk factors, prevention of breast cancer and awareness of the NHS breast screening service, delays in attending the NHS breast screening service and suggestions for improving information on breast cancer and the NHS breast cancer screening service. The findings from this study suggest the need for more targeted information on breast cancer and screening services for Black African women. This could help improve the uptake of the NHS breast screening service, promote early help-seeking behaviour and improve breast cancer outcomes for this ethnic group.

    Satisfaction and quality of life in women who undergo breast surgery: a qualitative study to develop conceptual model

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    Background: In cosmetic and reconstructive breast surgery, measurement of patient-reported outcomes has become increasingly important to research efforts and clinical care. We aimed to describe how breast conditions and breast surgery impact on patient satisfaction and quality of life. Methods: We conducted qualitative, in-depth interviews with 48 women who had undergone either breast reduction (n = 15), breast augmentation (n = 12), or breast reconstruction (n = 21) surgery in order to begin to build a theoretical understanding of patient satisfaction and quality of life in breast surgery patients. Interviews were audio-taped, transcribed verbatim and analyzed thematically. Results: The patient interviews revealed that breast conditions and breast surgery impact women in the following six main areas: satisfaction with breasts; satisfaction with overall outcome; psychosocial well-being; sexual well-being; physical well-being; and satisfaction with the process of care. We used these six themes to form the basis of a conceptual framework of patient satisfaction and quality of life in women who undergo breast surgery. Conclusion: Our conceptual framework establishes the main issues of concern for breast surgery patients. This new framework can be used to help develop local guidelines for future clinical assessment, management and measurement, establish the validity of the current management strategies, and develop evidence-based guidance for the development of new patient reported outcome measures for future outcomes research

    Flavonoids and Other Polyphenols Act as Epigenetic Modifiers in Breast Cancer.

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    Breast cancer is a common cancer that occurs due to different epigenetic alterations and genetic mutations. Various epidemiological studies have demonstrated an inverse correlation between breast cancer incidence and flavonoid intake. The anti-cancer action of flavonoids, a class of polyphenolic compounds that are present in plants, as secondary metabolites has been a major topic of research for many years. Our review analysis demonstrates that flavonoids exhibit anti-cancer activity against breast cancer occurring in different ethnic populations. Breast cancer subtype and menopausal status are the key factors in inducing the flavonoid\u27s anti-cancer action in breast cancer. The dose is another key factor, with research showing that approximately 10 mg/day of isoflavones is required to inhibit breast cancer occurrence. In addition, flavonoids also influence the epigenetic machinery in breast cancer, with research demonstrating that epigallocatechin, genistein, and resveratrol all inhibited DNA methyltransferase and altered chromatin modification in breast cancer. These flavonoids can induce the expression of different tumor suppressor genes that may contribute to decreasing breast cancer progression and metastasis. Additional studies are required to confirm the contribution of epigenetic modifications by flavonoids to breast cancer prevention
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