Metaplastic breast carcinoma (MBC) is a rare heterogeneous group of primary breast malignancies, with low hormone receptor expression and poor outcomes. To date, no prognostic markers for this tumor have been validated. The current study was undertaken to evaluate the clinicopathologic characteristics, the response to various therapeutic regimens and the prognosis of MBCs in a large cohort of patients from Tianjin Medical University Cancer Hospital in China. Ninety cases of MBCs diagnosed in our hospital between January 2000 and September 2014 were retrieved from the archives. In general, MBCs presented with larger size, a lower rate of lymph node metastasis, and demonstrated more frequent local recurrence/distant metastasis than 1,090 stage-matched cases of invasive carcinoma of no specific type (IDC-NST), independent of the status of estrogen receptor, progesterone receptor and human epidermal growth factor receptor 2 expressions. The five-year disease-free survival (DFS) of MBC was significantly worse than IDC-NST. Using univariate analysis, lymph node metastasis, advanced clinical stage at diagnosis, high tumor proliferation rate assessed by Ki-67 labeling, and epidermal growth factor receptor (EGFR) overexpression/gene amplification were associated significantly with reduced DFS, while decreased OS was associated significantly with lymph node metastasis and EGFR overexpression/gene amplification. With multivariate analysis, lymph node status was an independent predictor for DFS, and lymph node status and EGFR overexpression/gene amplification were independent predictors for OS. Histologic subtyping and molecular subgrouping of MBCs were not significant factors in prognosis. We also found that MBCs were insensitive to neoadjuvant chemotherapy, routine chemotherapy, and radiation therapy. This study indicates that MBC is an aggressive type of breast cancer with poor prognosis, and that identification and optimization of an effective comprehensive therapeutic regimen is needed. 相似文献
以樱桃番茄(Solanum lycopersicum var. cerasiforme)为试材,利用rDNA-ITS扩增测序技术鉴定自然发病番茄果实中分离的8种形态特征相异的菌株,并分析肉桂精油对采后病菌的抑菌效果和抑菌成分。结果表明,采后病原菌可归为5大类:枝孢属、青霉属、链格孢属、灰葡萄属和聚端孢属;肉桂精油表现出良好的抑菌效果,抑菌效果由强到弱为粉红单端孢菌、链格孢菌、扩展青霉菌、芽枝状枝孢菌、灰葡萄孢菌;抑菌圈试验中,粉红单端孢菌最为敏感,而芽枝状枝孢菌敏感度较弱;肉桂精油的75%成分具有抑菌作用。 相似文献
Obesity has become a major health problem that has rapidly prevailed over the past several decades worldwide. Curcumin, a natural polyphenolic compound present in turmeric, has been shown to have a protective effect on against obesity and metabolic diseases. However, its underlying mechanism remains largely unknown. Here, we show that the administration of curcumin significantly prevents HFD‐induced obesity and decreases the fat mass of the subcutaneous inguinal WAT (iWAT) and visceral epididymal WAT (eWAT) in mice. Mechanistically, curcumin inhibits adipogenesis by reducing the expression of AlkB homolog 5 (ALKHB5), an m6A demethylase, which leads to higher m6A‐modified TNF receptor‐associated factor 4 (TRAF4) mRNA. TRAF4 mRNA with higher m6A level is recognized and bound by YTHDF1, leading to enhanced translation of TRAF4. TRAF4, acting as an E3 RING ubiquitin ligase, promotes degradation of adipocyte differentiation regulator PPARγ by a ubiquitin–proteasome pathway thereby inhibiting adipogenesis. Thus, m6A‐dependent TRAF4 expression upregulation by ALKBH5 and YTHDF1 contributes to curcumin‐induced obesity prevention. Our findings provide mechanistic insights into how m6A is involved in the anti‐obesity effect of curcumin. 相似文献
Next-generation sequencing (NGS) has profoundly changed the approach to genetic/genomic research. Particularly, the clinical utility of NGS in detecting mutations associated with disease risk has contributed to the development of effective therapeutic strategies. Recently, comprehensive analysis of somatic genetic mutations by NGS has also been used as a new approach for controlling the quality of cell substrates for manufacturing biopharmaceuticals. However, the quality evaluation of cell substrates by NGS largely depends on the limit of detection (LOD) for rare somatic mutations. The purpose of this study was to develop a simple method for evaluating the ability of whole-exome sequencing (WES) by NGS to detect mutations with low allele frequency. To estimate the LOD of WES for low-frequency somatic mutations, we repeatedly and independently performed WES of a reference genomic DNA using the same NGS platform and assay design. LOD was defined as the allele frequency with a relative standard deviation (RSD) value of 30% and was estimated by a moving average curve of the relation between RSD and allele frequency.
Results
Allele frequencies of 20 mutations in the reference material that had been pre-validated by droplet digital PCR (ddPCR) were obtained from 5, 15, 30, or 40 G base pair (Gbp) sequencing data per run. There was a significant association between the allele frequencies measured by WES and those pre-validated by ddPCR, whose p-value decreased as the sequencing data size increased. By this method, the LOD of allele frequency in WES with the sequencing data of 15 Gbp or more was estimated to be between 5 and 10%.
Conclusions
For properly interpreting the WES data of somatic genetic mutations, it is necessary to have a cutoff threshold of low allele frequencies. The in-house LOD estimated by the simple method shown in this study provides a rationale for setting the cutoff.
GINS2在多种侵袭性肿瘤中上调,然而,其在非小细胞肺癌(NSCLC)中的作用及功能仍有待阐明.本研究主要对GINS2在非小细胞肺癌中的作用及功能进行分析,通过肿瘤基因组图谱(TCGA)数据库分析发现,GINS2在NSCLC中显著上调.为了研究GINS2在NSCLC细胞中的作用及其功能,首先,采用小干扰RNA技术设计了该基因的siRNA,以此来沉默GINS2的mRNA,细胞水平转染后,该基因在非小细胞肺癌细胞系NCI-H292和A549中的表达降低;随后,采用实时细胞分析仪(real time cell analyzer,RTCA)和Tran-swell小室实验对细胞的增殖、迁移和侵袭进行测定,最后采用流式细胞仪分析细胞的周期以及细胞凋亡.实验结果显示:在NCI-H292和A549两个细胞系中,用siRNA沉默GINS2的表达后,NCI-H292和A549细胞的生长能力、迁移能力和侵袭能力均会受到明显的抑制;此外,细胞的周期凋亡实验显示,在NCI-H292细胞系中,阻碍了细胞G1期向S期的转变;在A549细胞系中,阻碍了细胞S期向G2期的转变,同时在两个细胞系中均表现出促进细胞凋亡等功能.综上所述,敲低GINS2可抑制NCI-H292和A549细胞的增殖、迁移和侵袭,并且能阻滞细胞周期促进细胞凋亡等.因此,研究该基因在NSCLC中的功能对于后续研究分子机制具有很大的意义,可能是未来的特异性治疗靶点. 相似文献