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Mao Y.,Comprehensive Breast Health Center | Keller E.T.,University of Michigan | Garfield D.H.,Comprehensive Breast Health Center | Garfield D.H.,Aurora University | And 2 more authors.
Cancer and Metastasis Reviews | Year: 2013

Cancer is a systemic disease encompassing multiple components of both tumor cells themselves and host stromal cells. It is now clear that stromal cells in the tumor microenvironment play an important role in cancer development. Molecular events through which reactive stromal cells affect cancer cells can be defined so that biomarkers and therapeutic targets can be identified. Cancer-associated fibroblasts (CAFs) make up the bulk of cancer stroma and affect the tumor microenvironment such that they promote cancer initiation, angiogenesis, invasion, and metastasis. In breast cancer, CAFs not only promote tumor progression but also induce therapeutic resistance. Accordingly, targeting CAFs provides a novel way to control tumors with therapeutic resistance. This review summarizes the current understandings of tumor stroma in breast cancer with a particular emphasis on the role of CAFs and the therapeutic implications of CAFs. In addition, the effects of other stromal components such as endothelial cells, macrophages, and adipocytes in breast cancer are also discussed. Finally, we describe the biologic markers to categorize patients into a specific and confirmed subtype for personalized treatment. © 2012 Springer Science+Business Media New York. Source

Harbeck N.,Ludwig Maximilians University of Munich | Huang C.-S.,National Taiwan University Hospital | Hurvitz S.,University of California at Los Angeles | Hurvitz S.,Translational Research in Oncology | And 18 more authors.
The Lancet Oncology | Year: 2016

Background: Trastuzumab resistance is a key therapeutic challenge in metastatic breast cancer. We postulated that broader inhibition of ErbB receptors with afatinib would improve clinical outcomes compared with HER2 inhibition alone in patients who had progressed on previous trastuzumab treatment. LUX-Breast 1 compared afatinib plus vinorelbine with trastuzumab plus vinorelbine for such patients with HER2-positive metastatic breast cancer. Methods: We did this open-label trial at 350 hospitals in 41 countries worldwide. We enrolled female patients with HER2-overexpressing metastatic breast cancer who had progressed on or following adjuvant trastuzumab or first-line treatment of metastatic disease with trastuzumab. Participants were randomly assigned (2:1) to receive oral afatinib (40 mg/day) plus intravenous vinorelbine (25 mg/m2 per week) or intravenous trastuzumab (2 mg/kg per week after 4 mg/kg loading dose) plus vinorelbine. Randomisation was done centrally and stratified by previous trastuzumab treatment (adjuvant vs first-line treatment), hormone receptor status (oestrogen receptor and progesterone receptor positive vs others), and region. The primary endpoint was progression-free survival, assessed in the intention-to-treat population. This trial is closed to enrolment and is registered with ClinicalTrials.gov, NCT01125566. Findings: Between Aug 26, 2010, and April 26, 2013, we enrolled 508 patients: 339 assigned to the afatinib group and 169 assigned to the trastuzumab group. Recruitment was stopped on April 26, 2013, after a benefit-risk assessment by the independent data monitoring committee was unfavourable for the afatinib group. Patients on afatinib plus vinorelbine had to switch to trastuzumab plus vinorelbine, afatinib monotherapy, vinorelbine monotherapy, or receive treatment outside of the trial. Median follow-up was 9·3 months (IQR 3·7-16·0). Median progression-free survival was 5·5 months (95% CI 5·4-5·6) in the afatinib group and 5·6 months (5·3-7·3) in the trastuzumab group (hazard ratio 1·10 95% CI 0·86-1·41; p=0·43). The most common drug-related adverse events of grade 3 or higher were neutropenia (190 [56%] of 337 patients in the afatinib group vs 102 [60%] of 169 patients in the trastuzumab group), leucopenia (64 [19%] vs 34 [20%]), and diarrhoea (60 [18%] vs none). Interpretation: Trastuzumab-based therapy remains the treatment of choice for patients with HER2-positive metastatic breast cancer who had progressed on trastuzumab. Funding: Boehringer Ingelheim. © 2016 Elsevier Ltd. Source

Chen X.,Comprehensive Breast Health Center | Fei X.,Shanghai JiaoTong University | Fu C.,Siemens AG | Yan X.,Siemens AG | Shen K.,Comprehensive Breast Health Center
Radiology | Year: 2015

Purpose: To assess diagnostic accuracy with diffusion kurtosis imaging (DKI) in patients with breast lesions and to evaluate the potential association between DKI-derived parameters and breast cancer clinical-pathologic factors. Materials and Methods: Institutional review board approval and written informed consent were obtained. Data from 97 patients (mean age 6 standard deviation, 45.7 years 6 13.1; range, 19-70 years) with 98 lesions (57 malignant and 41 benign) who were treated between January 2014 and April 2014 were retrospectively analyzed. DKI (with b values of 0-2800 sec/mm2) and conventional diffusion-weighted imaging data were acquired. Kurtosis and diffusion coefficients from DKI and apparent diffusion coefficients from diffusion-weighted imaging were measured by two radiologists. Student t test, Wilcoxon signed-rank test, Jonckheere-Terpstra test, receiver operating characteristic curves, and Spearman correlation were used for statistical analysis. Results: Kurtosis coefficients were significantly higher in the malignant lesions than in the benign lesions (1.05 6 0.22 vs 0.65 6 0.11, respectively; P , .0001). Diffusivity and apparent diffusion coefficients in the malignant lesions were significantly lower than those in the benign lesions (1.13 6 0.27 vs 1.97 6 0.33 and 1.02 6 0.18 vs 1.48 6 0.33, respectively; P , .0001). Significantly higher specificity for differentiation of malignant from benign lesions was shown with the use of kurtosis and diffusivity coefficients than with the use of apparent diffusion coefficients (83% [34 of 41] and 83% [34 of 41] vs 76% [31 of 41], respectively; P , .0001) with equal sensitivity (95% [54 of 57]). In patients with invasive breast cancer, kurtosis was positively correlated with tumor histologic grade (r = 0.75) and expression of the Ki-67 protein (r = 0.55). Diffusivity was negatively correlated with tumor histologic grades (r = 20.44) and Ki-67 expression (r = 20.46). Conclusion: DKI showed higher specificity than did conventional diffusion-weighted imaging for assessment of benign and malignant breast lesions. Patients with grade 3 breast cancer or tumors with high expression of Ki-67 were associated with higher kurtosis and lower diffusivity coefficients; however, this association must be confirmed in prospective studies. © RSNA, 2015. Source

Zheng J.,Shanghai JiaoTong University | Zheng J.,Fudan University | Weng J.,Shanghai JiaoTong University | Sun X.,Shanghai JiaoTong University | And 10 more authors.
Clinical Cancer Research | Year: 2013

Purpose: Prostate cancer is the second leading cause of cancer deaths among men in Western counties, which has also occurred in Chinese male with markedly increasing incidence in recent years. Although the mechanism underlying its progression still remains unclear, epigenetic modifications are important ethological parameters. The purpose of this study is to determine the methylation status and function of hypermethylatioted in cancer 1 (HIC1) in prostate cancer progression. Experimental Design: The methylation status of HIC1 promoter was assayed in cell lines, tissues, and plasma of patients with prostate cancer by using methylation-specific PCR and bisulfate sequencing PCR. The ability of HIC1 to regulate proliferation, migration, and invasion was assessed by MTT, scratch-healing assay, and reconstituted extracellular matrices in porous culture chambers. Tumorigenesis, metastases, and bone destruction were analyzed in mice bearing prostate cancer cells restoring HIC1 by using Xenogen IVIS with radiographic system and small-animal positron emission tomography computed tomographic images. Microarrays were searched for genes that had correlated expression with HIC1 mRNA. Reporter gene assays were used to determine whether HIC1 affected the expression of CXCR7, and chromatin immunoprecipitation was used to determine whether HIC1 bound to CXCR7 promoters. All P values were determined using 2-sided tests. Results: The methylation status of 11CpGsites within HIC1 promoter was abundantly methylated in cell lines, tissues, and plasma of patients with prostate cancer compared with those of respective normal controls. Restoring HIC1 expression in prostate cancer cells markedly inhibited proliferation, migration, and invasion and induced the apoptosis in these cells. Moreover, mice bearing prostate cancer-restoring HIC1 cells had a marked effect on reducing tumor growth, multiple tissue metastases, and bone destruction. Notably, we also identified that the chemokine receptor CXCR7 is a direct downstream target gene of HIC1. Finally, we showed thatCXCR7 promoter in prostate cancer cells is negatively regulated by HIC1, which may be responsible for prostate cancer progression. Conclusions: Our data show for the first time that hypermethylation of HIC1 promoter results in loss of its repressive function, responsible for prostate cancer progression and invasion. These findings suggest that therapies targeting epigenetic events regulating HIC1 expression may provide a more effective strategy for prostate cancer treatment. © 2012 AACR. Source

Wu Y.,Donghua University | Guo R.,Donghua University | Wen S.,Donghua University | Shen M.,Donghua University | And 4 more authors.
Journal of Materials Chemistry B | Year: 2014

We report here an effective approach to modifying laponite (LAP) nanodisks with folic acid (FA) for targeted anticancer drug delivery applications. In this approach, LAP nanodisks were first modified with 3-aminopropyldimethylethoxysilane (APMES) to render them with abundant surface amines, followed by conjugation with FA via 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) chemistry. The formed FA-modified LAP nanodisks (LM-FA) were then used to encapsulate anticancer drug doxorubicin (DOX). The surface modification of LAP nanodisks and the subsequent drug encapsulation within the LAP nanodisks were characterized via different techniques. We show that the LM-FA is able to encapsulate DOX with an efficiency of 92.1 ± 2.2%, and the formed LM-FA/DOX complexes are able to release DOX in a pH-dependent manner with a higher DOX release rate under acidic pH conditions than under physiological pH conditions. The encapsulation of DOX within LM-FA does not compromise its therapeutic activity. Importantly, the formed LM-FA/DOX complexes are able to specifically target cancer cells overexpressing high-affinity FA receptors as confirmed via flow cytometric analysis and confocal microscopic observation, and exert specific therapeutic efficacy to the target cancer cells. The developed FA-modified LAP nanodisks may hold great promise to be used as an efficient nanoplatform for targeted delivery of different anticancer drugs. © the Partner Organisations 2014. Source

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