High Expression In Tumor Tissues Research Articles

A novel protein encoded by circFOXP1 enhances ferroptosis and inhibits tumor recurrence in intrahepatic cholangiocarcinoma

CircRNAs participates in the development and occurrence of multiple tumor types. However, the specific effects and underlying mechanisms of circRNA in intrahepatic cholangiocarcinoma (ICC) progression and recurrence remain poorly understood. CircRNA sequencing was performed to screen circRNAs related to ICC recurrence after surgery using 53 ICC frozen tumor specimens. We found that compared with patients who experienced postsurgical recurrence, circFOXP1 had high expression in tumor tissues from patients with no postoperative recurrence. Functional experiments revealed that circFOXP1 inhibited ICC progression in vitro and in vivo. We then found that circFOXP1 inhibited ICC progression via encoding a novel protein, circFOXP1-231aa. Mechanistically, circFOXP1-231aa directly interacted with OTUD4, which regulates NCOA4 protein stability via deubiquitination modification, and thereby enhances ferroptosis of ICC cells. Examination of clinical ICC samples found positive correlations between circFOXP1 expression levels and levels of OTUD4 and NCOA4. These three factors are predictors of prognosis in patients with ICC. Collectively, we identified circFOXP1 encoded circFOXP1-231aa, which interacted with OTUD4 to suppress ubiquitination of NCOA4 and, thereby, promoted ferroptosis and inhibited ICC recurrence.

THOC7-AS1/OCT1/FSTL1 axis promotes EMT and serves as a therapeutic target in cutaneous squamous cell carcinoma

BackgroundTHOC7-AS1 and FSTL1 expression are frequently upregulated in cutaneous squamous cell carcinoma (cSCC). However, their molecular biological mechanisms remain elusive and their potential as therapeutic targets needs urgent exploration.MethodsHuman tissue samples were used to evaluate clinical parameters. In vitro and in vivo experiments assessed biological functions. Quantitative PCR, western blot, immunohistochemistry, immunocytochemistry, immunoprecipitation, RNA fluorescence in situ hybridization, RNA pull-down, RNA immunoprecipitation, silver staining, chromatin immunoprecipitation, dual luciferase reporter assays etc. were utilized to explore the molecular biological mechanisms.ResultsWe found FSTL1 is an oncogene in cSCC, with high expression in tumor tissues and cells. Its elevated expression closely associates with tumor size and local tissue infiltration. In vitro and in vivo, high FSTL1 expression promotes cSCC proliferation, migration and invasion, facilitating malignant behaviors. Mechanistically, FSTL1 interacts with ZEB1 to promote epithelial-to-mesenchymal transition (EMT) in cSCC cells. Exploring upstream regulation, we found THOC7-AS1 can interact with OCT1, which binds the FSTL1 promoter region and promotes FSTL1 expression, facilitating cSCC progression. Finally, treating tumors with THOC7-AS1 antisense oligonucleotides inhibited cSCC proliferative and migratory abilities, delaying tumor progression.ConclusionsThe THOC7-AS1/OCT1/FSTL1 axis regulates EMT and promotes tumor progression in cSCC. This study provides clues and ideas for cSCC targeted therapy.

Abstract 3482: Single-cell transcriptome analysis reveals that PLK4 signature genes are highly associated with cancer proliferation and hotspot mutations in non-small cell lung cancer (NSCLC)

Abstract Background: Polo-like kinase 4 (PLK4) is a member of the polo-like kinase family known for its precise regulation during the cell cycle and its key role in centriole duplication, which is essential for proper cell division. Dysregulation of PLK4 is associated with abnormal centriole number, genomic instability and cancer development. In our previous study, we proposed PLK4 as a potential therapeutic target and biomarker for LUAD patients with TP53 mutations by bulk RNA-seq analysis and confirmed its association with drug resistance. In this study, we analyzed the expression of PLK4 and its association with cell cycle at the cellular level by scRNA-seq in NSCLC data. Methods: In a previous study, we analyzed NSCLC data from The Cancer Genome Atlas (TCGA) database using the UCSC Xena data portal. In this study, we analyzed E-MTAB-6653 dataset from the single cell expression atlas(https://www.ebi.ac.uk/gxa/sc/home). Results: In the previous study, we demonstrated that PLK4 expression is higher in primary tumors compared to normal tissues in NSCLC. Higher PLK4 expression in patients is associated with an unfavorable prognosis. Using genes highly correlated with PLK4, we confirmed a significant association between PLK4 and TP53 mutation by statistical analysis. Using the Drug Gene Interaction database, we observed an association between the drug resistance-related genes PBK and BIRC5 with PLK4, and these genes were also correlated with TP53 mutation. In this study, we investigated the association between PLK4 and the cell cycle using single cell RNA-seq. First, we performed data pre-processing to selectively isolate NSCLC cells. Using a set of 87 PLK4 signature genes obtained from previous research, we stratified the samples into PLK4 high and low groups based on the expression of these genes. We then analyzed cell cycle related genes in both groups and observed a higher expression of G2/M phase related genes in the PLK4 high group compared to the PLK4 low group. We also examined the expression of PLK4 signature genes based on pathological differences and found higher expression in tumor tissue compared to normal tissue. There was also an increasing expression gradient from the tumor margin to the tumor core. Finally, using Gene Ontology analysis of both groups, we confirmed the upregulation of genes associated with transcription and translation, as indicated by the GO terms obtained. Conclusion: In a previous study, the association between PLK4 expression, TP53 mutation and drug resistance was identified by bulk RNA-seq. In the current study, we used single cell RNA-seq to verify the correlation between PLK4 and cell cycle in NSCLC. In addition, we observed that the expression of PLK4 signature genes increased towards the tumor core based on pathological differences. Citation Format: Youngtaek Kim, Joon Yeon Hwang, YoungJoon Park, Dong Kwon Kim, Kwangmin Na, Seul Lee, Sujeong Baek, Seong-san Kang, Seung Min Yang, Mi Hyun Kim, Heekyung Han, Chai Young Lee, Yu Jin Han, Min Hee Hong, Jii Bum Lee, Sun Min Lim, Kyoung-Ho Pyo, Byoung Chul Cho. Single-cell transcriptome analysis reveals that PLK4 signature genes are highly associated with cancer proliferation and hotspot mutations in non-small cell lung cancer (NSCLC) [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 1 (Regular Abstracts); 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84(6_Suppl):Abstract nr 3482.

Cancer/testis antigens: promising immunotherapy targets for digestive tract cancers.

Digestive tract cancers, including esophageal, gastric, and colorectal cancers, are the major cause of death among cancer patients worldwide due to the heterogeneity of cancer cells, which limits the effectiveness of traditional treatment methods. Immunotherapy represents a promising treatment strategy for improving the prognosis of patients with digestive tract cancers. However, the clinical application of this approach is limited by the absence of optimal targets. Cancer/testis antigens are characterized by low or absent expression in normal tissues, but high expression in tumor tissues, making them an attractive target for antitumor immunotherapy. Recent preclinical trials have shown promising results for cancer/testis antigen-targeted immunotherapy in digestive cancer. However, practical problems and difficulties in clinical application remain. This review presents a comprehensive analysis of cancer/testis antigens in digestive tract cancers, covering their expression, function, and potential as an immunotherapy target. Additionally, the current state of cancer/testis antigens in digestive tract cancer immunotherapy is discussed, and we predict that these antigens hold great promise as an avenue for breakthroughs in the treatment of digestive tract cancers.

CDCA7 serves as a novel prognostic marker in human hepatocellular carcinoma

ABSTRACT c-Myc oncogene plays an important role in tumorigenesis, cell division cycle associated 7 (CDCA7), recently found that it is a direct target gene of c-Myc, is upregulated in many tumors, but its role in tumor progression is still poorly understood. CDCA7 expression and prognosis were analyzed in hepatocellular carcinoma using TIMER2.0 and Kaplan–Meier databases, while genomic changes were studied using cbioportal. LinkedOmics identified relevant genes and WebGestalt analyzed the associated pathways. Protein interaction networks were explored using the STRING database, and the core PPI network was analyzed with the MCODE plugin of Cytoscape. CDCA7 expression was detected in 30 paired HCC specimens by real-time PCR, and its effect on HCC cell proliferation was determined in vitro. CDCA7 expression was frequently up-regulated in human hepatocellular carcinoma (HCC), and its expression was positively correlated with prognosis. The TIMER2.0 database showed that CDCA7 was differentially expressed in hepatocellular carcinoma, with high expression in tumor tissues and low expression in normal tissues. The Kaplan-Meier database shows that high CDCA7 expression has a worse prognosis. The cBioportal database showed that the genomic change rate of CDCA7 in hepatocellular carcinoma was 2.15%, including mutations, amplifications, and deep deletions. Pathway analysis of related genes showed that CDCA7-related genes were mainly focused on cell division-related pathways. The experimental results also validate our study. CDCA7 could contribute to HCC progression and raise the possibility that CDCA7 is a potential new therapeutic target for HCC treatment.

Abstract 6320: CUSP06/AMT-707, a new CDH6-targeting antibody-drug conjugate, demonstrates potent antitumor activity in preclinical models

Abstract Cadherin-6 (CDH6), also known as K-cadherin, is a type II classic cadherin molecule that plays an important role in the embryonic development of the kidney, but has very limited expression in adult tissues. It is overexpressed in several human malignancies, primarily in ovarian, renal, but also (to a lesser degree) gastric, thyroid, cholangiocarcinoma and other tumor types. The characteristics of limited expression in normal tissues, high expression in tumor tissues, and rapid internalization upon antibody binding makes CDH6 a well-suited Antibody-drug Conjugate (ADC) target. We developed a novel CDH6-targeting ADC, CUSP06, consisting of a proprietary humanized antibody selective for CDH6, a protease cleavable linker, and an exatecan payload, with a drug-to-antibody ratio (DAR) of 8. CUSP06 selectively bound to cell surface CDH6 and was efficiently internalized into CDH6 positive ovarian and renal cancer cells. CUSP06 exhibited strong antiproliferative activity against several CDH6 positive cancer cell lines in vitro. Furthermore, compared to a DXd-based ADC, a exatecan-based ADC demonstrated improved bystander effect. Treatment with CUSP06 resulted in tumor regression in several CDH6 positive cell line derived xenograft (CDX) models, including PA-1, OVCAR3, and 786-O. In addition, CUSP06 demonstrated potent antitumor activity with tumor regression observed in two CDH6 low and high expressing patient derived xenograft (PDX) models. The preclinical activity of CUSP06 against CDH6-expressing tumors provide compelling support for the clinical development of CUSP06 in CDH6-expressing human cancers. CUSP06 is currently in IND-enabling studies. CUSP06 showed an expected toxicity profile consistent with it's exatecan payload in the ongoing pilot toxicology studies. We plan to initiate a Phase 1 first-in-human clinical trial in the 2nd half of 2023. Citation Format: Wei Lu, Jing Shi, Shu-Hui Liu, Nicole Covino, Xun Meng, Eric D. Slosberg. CUSP06/AMT-707, a new CDH6-targeting antibody-drug conjugate, demonstrates potent antitumor activity in preclinical models [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 1 (Regular and Invited Abstracts); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(7_Suppl):Abstract nr 6320.

Abstract 1897: RNA expression markers with differential expression by race/ancestry are associated with prostate tumor aggressiveness among African American men

Abstract There is growing evidence of molecular differences in prostate tumors by race or ancestry, which may contribute to the disproportionate burden of aggressive prostate cancer for African American men. Here we investigated whether RNA expression of 310 genes or non-coding RNAs that have shown differential expression (p<0.05) in prostate tumors by race/ancestry in past studies were associated with prostate tumor aggressiveness among African American men. We accessed formalin-fixed, paraffin-embedded prostate tumor tissue for 191 African American men with prostate cancer who underwent radical prostatectomy at the University of Maryland Medical Center from 1992-2021, as well as paired normal prostate tissue for a subset of the men (n=105). We generated RNA expression data using the ThermoFisher Human Clariom D array. Using Wilcoxon tests, we compared prostate tumor RNA expression by tumor aggressiveness (total Gleason score, GS, >=7 vs. <=6). The Benjamini-Hochberg False Discovery Rate approach was used to adjust for multiple comparisons. Of the 310 genes/non-coding RNAs, 110 were significantly associated with GS (p<0.05), and 65 remained significant after multiple comparison adjustment (q<0.05). Almost all (60/65) of the top findings tended to have lower expression in higher- vs. lower-grade tumors. There were several findings with q<0.01, which included B-cell CLL/lymphoma 2 (BCL2; median and IQR for GS<=6: 4.6, 4.3-4.8 and GS>=7: 4.3, 4.0-4.5; p=9.90E-05; q=0.01) and zinc finger homeobox 3 (ZFHX3; median and IQR for GS<=6: 4.0, 3.7-4.7 and GS>=7: 3.7, 3.5-4.0; p=1.30E-04; q=0.01). Notably, both genes were found to have lower expression in prostate tumor tissue in African American men compared to European American men in previous studies. Therefore, the direction of our findings with GS (lower expression for higher-grade tumors) is consistent with a potential role of these genes in prostate cancer disparities. The genes that had higher expression in higher- vs. lower-grade tumors in our study included several genes that have shown higher expression in tumor tissue from African American men than European American men in previous studies. These included splicing factor 1 (SF1; median and IQR for GS<=6: 3.5, 3.1-5.1 and GS>=7: 4.6, 3.3-7.4; p=5.60E-03; q=0.04), uroplakin 3B-like (UPK3BL; median and IQR for GS<=6: 6.1, 4.9-7.7 and GS>=7: 7.4, 5.5-9.3; p=7.20E-03; q= 0.04), and RNA binding motif protein 6 (RBM6; median and IQR for GS<=6: 9.6, 8.2-10.7 and GS>=7: 10.3, 8.9-12.1; p=0.01; q=0.05). While replication is needed, these findings add to growing evidence that RNA expression differences in prostate tumors by race or ancestry may contribute to prostate tumor aggressiveness and prostate cancer disparities. Citation Format: Jessica Yau, Ebuka Onyenobi, Yuji Zhang, Teklu B. Legesse, Gary Rose, Guangjing Zhu, Allen Burke, Ashley Cellini, Kimberly Clark, Nicholas Ambulos, Jing Yin, Søren M. Bentzen, Arif Hussain, Joanne Dorgan, Lorelei A. Mucci, Kathryn Hughes Barry. RNA expression markers with differential expression by race/ancestry are associated with prostate tumor aggressiveness among African American men [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 1 (Regular and Invited Abstracts); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(7_Suppl):Abstract nr 1897.

Assessing Putative Markers of Colorectal Cancer Stem Cells: From Colonoscopy to Gene Expression Profiling.

Cancer stem cells (CSCs) are proposed to be involved in colorectal cancer (CRC) initiation, growth, and metastasis. The aim of our pilot study was to assess possible correlations between the clinicopathological characteristics of CRC patients and CSCs gene expression patterns, in order to provide insight into new methods for patient stratification and targeted therapeutic strategies. Our study involved 60 CRC patients, and the following three specific CSC genes were targeted: PROM1/CD133, ALCAM/CD166 and HCAM /CD44. Data are presented as relative mRNA expression of target genes to GAPDH. The expression of total CD133 and CD166 was assessed in paired samples of CRC tumors and adjacent tissue, while CD44 was assessed in similar samples. The qRT-PCR analysis detected all three targeted genes to different extents, in both normal and tumor tissue. In nine cases (15.69%), total CD133 had a higher expression in tumor tissue, whilst in 28 cases (47.06%) the expression was higher in non-malignant peritumor tissue. The total CD166 expression was increased in tumor tissue compared with paired non-invaded peritumor samples in eight cases (13.73%), whilst in eight cases (13.73%) the expression was higher in non-malignant peritumor tissue. Total CD44 expression was higher in tumor tissue compared with paired non-invaded peritumor samples in 47 cases (78.95%). In the remaining cases the difference between paired samples was biologically insignificant. In conclusion, our study suggests that qRT-PCR is feasible in assessing the gene expression profiles of CSCs from CRC, and a promising pathway to be followed for determining how often a person needs screening by colonoscopy and at which age to start. This could improve CRC diagnosis and early patient stratification, and open the way for new oncologic treatment development.

High levels of unfolded protein response component CHAC1 associates with cancer progression signatures in malignant breast cancer tissues.

The aberrant mRNA expression of a UPR component Cation transport regulator homolog 1 (CHAC1) has been reported to be associated with poor survival in breast and ovarian cancer patients, however, the expression of CHAC1 at protein levels in malignant breast tissues is underreported. The following study aimed at analyzing CHAC1 protein expression in malignant breast cancer tissues. Evaluation of CHAC1 expression in invasive ductal carcinomas (IDCs) with known ER, PR, and HER2 status was carried out using immunohistochemistry (IHC) with CHAC1 specific antibody. The Human breast cancer tissue microarray (TMA, cat# BR1503f, US Biomax, Inc., Rockville, MD) was used to determine CHAC1 expression. The analysis of CHAC1 IHC was done to determine its expression in terms of molecular subtypes of breast cancer, lymph node status, and proliferation index using Qu-Path software. Survival analysis was studied with a Kaplan-Meier plotter. Immunohistochemical analysis of CHAC1 in breast cancer tissues showed significant up-regulation of CHAC1 as compared to the adjacent normal and benign tissues. Interestingly, CHAC1 immunostaining revealed high expression in tumor tissues with high proliferation and positive lymph node metastasis suggesting that CHAC1 might have an important role to play in breast cancer progression. Furthermore, high CHAC1 expression is associated with poor overall survival (OS) in large breast cancer patient cohorts. As a higher expression of CHAC1 was observed in tissue cores with high Ki67 index and positive lymph node metastasis it may be concluded that enhanced CHAC1 expression correlates with proliferation and metastasis. The further analysis of breast cancer patients' survival data through KM plot indicated that high CHAC1 expression is associated with a bad prognosis hinting that CHAC1 may have a possible prognostic significance in breast cancer.

Comprehensive analysis reveals COPB2 and RYK associated with tumor stages of larynx squamous cell carcinoma

BackgroundLaryngeal squamous cell carcinoma (LSCC) is one of the highly aggressive malignancy types of head and neck squamous cell carcinomas; genes involved in the development of LSCC still need exploration.MethodsWe downloaded expression profiles of 96 (85 in advanced stage and 11 in early stage) LSCC patients from TCGA-HNSC. Function enrichment and protein-protein interactions of genes in significant modules were conducted. Univariate and multivariate Cox regression analyses were performed to explore potential prognostic biomarkers for LSCC. The expression levels of genes at different stages were compared and visualized via boxplots. Immune infiltration was examined by the CIBERSORTx web-based tool and depicted with ggplot2. Gene set enrichment analysis (GSEA) was utilized to analyze functional enrichment terms and pathways. Immunohistochemical staining (IHC) was used to verify the expression of genes in the LSCC samples.ResultsWe identified 25 modules, including 3 modules significantly related to tumor stages of LSCC via weighted gene co-expression network analysis (WGCNA). UIMC1, NPM1, and DCTN4 in the module ‘cyan’, TARS in the module ‘darkorange’, and COPB2 and RYK in the module ‘lightyellow’ showed statistically significant relation to overall survival. The expression of COPB2, DCTN4, RYK, TARS, and UIMC1 indicated association with the change of fraction of immune cells in LSCC patients; two genes, COPB2 and RYK, indicated different expression in various tumor stages of LSCC. Finally, COPB2 and RYK showed high-expression in tumor tissues of advanced LSCC patients.ConclusionsOur study provided a potential perceptive in analyzing progression of LSCC cells and exploring prognostic genes.

Tissue Type Differences in ABCB1 Expression and Paclitaxel Tissue Pharmacokinetics in Patients With Esophageal Cancer.

Background: Data from previous work suggests that there is no correlation between systemic (plasma) paclitaxel exposure and efficacy in patients treated for esophageal cancer. In this trial, we investigated ATP-binding cassette efflux transporter expression and intratumoral pharmacokinetics of paclitaxel to identify changes which could be a first sign of chemoresistance. Methods: Patients with esophageal cancer treated with paclitaxel and carboplatin (± concomitant radiotherapy) were included. During the first and last cycle of weekly paclitaxel, blood samples and biopsies of esophageal mucosa and tumor tissue were taken. Changes in paclitaxel exposure and expression of ABCB1 (P-glycoprotein) over time were studied in both tumor tissue and normal appearing esophageal mucosa. Results: ABCB1 was significantly higher expressed in tumor tissue compared to esophageal tissue, during both the first and last cycle of paclitaxel (cycle 1: p < 0.01; cycle 5/6: p = 0.01). Interestingly, ABCB1 expression was significantly higher in adenocarcinoma than in squamous cell carcinoma (p < 0.01). During the first cycle, a trend towards a higher intratumoral paclitaxel concentration was observed compared to the esophageal mucosa concentration (RD:43%; 95%CI: −3% to 111% p = 0.07). Intratumoral and plasma paclitaxel concentrations were significantly correlated during the first cycle (AUC0–48 h: r = 0.72; p < 0.01). Conclusion: Higher ABCB1 expression in tumor tissue, and differences between histological tumor types might partly explain why tumors respond differently to systemic treatment. Resistance by altered intratumoral paclitaxel concentrations could not be demonstrated because the majority of the biopsies taken at the last cycle of paclitaxel did contain a low amount of tumor cells or no tumor.

Roles of hydroxyacyl-CoA dehydrogenase trifunctional multienzyme complex subunit alpha, a lipid metabolism enzyme, in Wilms tumor patients.

Wilms tumor is a common pediatric malignant tumor that accounts for approximately 95% of kidney tumors in children. The role of lipid metabolism in tumors has attracted increased attention in recent years. We examined the role of hydroxyacyl-CoA dehydrogenase trifunctional multienzyme complex subunit alpha (HADHA), a lipid metabolism enzyme, in the pathogenesis of Wilms tumor. In a previous study, we screened Wilms tumors and adjacent normal tissues for differentially expressed proteins by mass spectrometry and verified the results by western blot analysis. The Oncomine database and quantitative reverse transcription-polymerase chain reaction were used to verify the expression of HADHA at the genetic level. Immunohistochemistry and immunofluorescence were also used to validate the differential expression of the HADHA protein. The relationship between histopathological typing, clinical pathology, and HADHA expression was analyzed in 65 paraffin-embedded specimens from pediatric Wilms tumor patients. Kaplan-Meier survival curves were used to analyze the relationship between the expression of HADHA and patient prognosis. HADHA was expressed at low levels in Wilms tumor tissue compared with the corresponding normal tissue. The expression of HADHA was closely associated with histopathological typing (P = 0.030). The prognostic analysis of 65 children with Wilms tumor showed that high expression of HADHA was closely associated with poor prognosis (P = 0.046). HADHA expression is downregulated in Wilms tumor tissues, but high expression in tumor tissues is associated with clinical stage and the prognosis of children with this tumor.

SNX10 and PTGDS are associated with the progression and prognosis of cervical squamous cell carcinoma

BackgroundCervical cancer (CC) is the primary cause of death in women. This study sought to investigate the potential mechanism and prognostic genes of CC.MethodsWe downloaded four gene expression profiles from GEO. The RRA method was used to integrate and screen differentially expressed genes (DEGs) between CC and normal samples. Functional analysis was performed by clusterprofiler. We built PPI network by Search Tool for the Retrieval of Interacting Genes Database (STRING) and selected hub modules via Molecular COmplex Detection (MCODE). CMap database was used to find molecules with therapeutic potential for CC. The hub genes were validated in GEO datasets, Gene Expession Profiling Interactive Analysis (GEPIA), immunohistochemistry, Cox regression analysis, TCGA methylation analysis and ONCOMINE were carried out. ROC curve analysis and GSEA were also performed to describe the prognostic significance of hub genes.ResultsFunctional analysis revealed that 147 DEGs were significantly enriched in binding, cell proliferation, transcriptional activity and cell cycle regulation. PPI network screened 30 hub genes, with CDK1 having the strongest connectivity with CC. Cmap showed that apigenin, thioguanine and trichostatin A might be used to treat CC(P < 0.05). Eight genes (APOD, CXCL8, MMP1, MMP3, PLOD2, PTGDS, SNX10 and SPP1) were screened out through GEPIA. Of them, only PTGDS and SNX10 had not appeared in previous studies about CC. The validation in GEO showed that PTGDS showed low expression while SNX10 presented high expression in tumor tissues. Their expression profiles were consistent with the results in immunohistochemistry. ROC curve analysis indicated that the model had a good diagnostic efficiency (AUC = 0.738). GSEA analysis demonstrated that the two genes were correlated with the chemokine signaling pathway (P < 0.05). TCGA methylation analysis showed that patients with lowly-expressed and highly-methylated PTGDS had a worse prognosis than those with highly-expressed and lowly-methylated PTGDS (p = 0.037). Cox regression analysis showed that SNX10 and PTGDS were independent prognostic indicators for OS among CC patients (P = 0.007 and 0.003).ConclusionsPTGDS and SNX10 showed abnormal expression and methylation in CC. Both genes might have high prognostic value of CC patients.

Monitoring HOTTIP levels on extracellular vesicles for predicting recurrence in surgical non-small cell lung cancer patients

In resected non-small cell lung cancer (NSCLC), postsurgical recurrence is the major factor affecting long-term survival. The identification of biomarkers in extracellular vesicles (EV) obtained from serial blood samples after surgery could enhance early detection of relapse and improve NSCLC outcome. Since EV cargo contains long non-coding RNAs (lncRNAs), we aimed to analyze whether the oncogenic lncRNA HOTTIP, which higher expression in tumor tissue was related to worse outcome in NSCLC, could be detected in EV from NSCLC patients and serve as recurrence biomarker. After purification of EVs by ultracentrifugation in 52 serial samples from 18 NSCLC patients, RNA was isolated and HOTTIP was quantified by Real time PCR. We observed that patients that relapsed after surgery displayed increased postsurgical EV HOTTIP levels in comparison with presurgical levels. In the relapsed patients with several samples available between surgery and relapse, we observed an increment in the EV HOTTIP levels when approaching to relapse, which indicated its potential utility for monitoring disease recurrence. When we focused in EV HOTTIP levels in the first post-surgical sample, we observed that the detection of an increment of the expression levels in comparison to presurgical sample, predicted recurrence with high sensitivity (85.7%) and specificity (90.9%) and that patients had shorter time to relapse and shorter overall survival. In conclusion, our pilot study showed that EV HOTTIP is a potential biomarker for monitoring disease recurrence after surgery in NSCLC.

Altered Expression of MBNL Family of Alternative Splicing Factors in Colorectal Cancer.

Colorectal cancer is currently the third leading cause of cancer-related deaths and recently, alternative splicing has risen as its important regulator and potential treatment target. In the present study, we analyzed gene expression of the MBNL family of regulators of alternative splicing in various stages of colorectal cancer development, together with the MBNL-target splicing events in FOXP1 and EPB41L3 genes and tumor-related CD44 variants. Samples of tumor tissue and non-malignant mucosa from 108 patients were collected. After RNA isolation and reverse transcription, the relative gene expression of a selected gene panel was tested by quantitative real-time PCR, followed by statistical analysis. MBNL expression was decreased in tumor tissue compared to non-tumor mucosa. In addition, lower expression was observed for the variants of FOXP1 and EPB41L3, while higher expression in tumor tissue was detected both for total CD44 and its cancer-related variants 3 and 6. Transcript levels of the MBNL genes were not found to be related to any of the studied clinicopathological characteristics. Multiple significant associations were identified in the target gene panel, including higher transcript levels of FOXP1 and CD44v3 in patients with distant metastases and connections between recurrence-free survival and altered levels of FOXP1 and CD44v3. Our results identified for the first-time deregulation of MBNL genes in colorectal cancer. Down-regulation of their transcripts in tumor tissue compared to matched non-tumor mucosa can lead to transition of alternative splicing patterns towards a less differentiated phenotype, which highlights the importance of alternative splicing regulation for tumor growth and propagation.

Assessing CD 10 Expression Level and Its Prognostic Impact in Egyptian Patients with Urothelial Carcinoma.

Background and aim:CD10 is expressed in urothelial carcinoma cells and cancer associated fibroblasts (CAF). In the current study, CD10 immunohistochemical staining (IHC) and CD10 mRNA expression in urothelial carcinoma of bladder (UCB) were assessed, and its relationship with tumor progression and prognosis was investigated. Patients and Methods:In this study, 106 formalin fixed paraffin-embedded (FFPE) tissue of UCB, obtained through radical cystectomy specimen, and 10 matched normal tissue samples were included.CD10 expression was evaluated by immunohistochemistry and real time PCR techniques. Results:CD10 expression in tumor cells and associated stromal fibroblasts was significantly associated with high tumor grade and advanced stage. Significant correlation was found between CD10 tumor expression and lymphovascular invasion (LVI) (P<0.001) as well as perineural invasion (PNI). CD10 expression in stromal fibroblasts was significantly associated with squamous differentiation of tumor cells, lymph node metastasis (LNM), and tumor necrosis. Positive CD10 expression in both tumor cells and associated stromal fibroblasts was associated with shorter OS . CD10 mRNA was overexpressed in tumors in comparison with the matched normal tissues. CD10 mRNA was significantly higher in invasive tumor, advanced stage tumor, and high grade tumor. There was significant correlation between CD10 mRNA tumor expression and LVI, PNI, and tumor recurrence. Conclusion:Increased expression of CD10 in the tumor and CAF was strongly correlated with tumor progression, invasion, metastasis, shorter OS, and RFS in urothelial carcinoma patients. CD10 mRNA showed significantly higher expression in tumor tissue than in matched normal tissue. CD10 mRNA was associated with depth of invasion, TNM stage, tumor grade, vascular tumor invasion, and tumor recurrence.

Identification of kinesin family member 3B (KIF3B) as a molecular target for gastric cancer.

Gastric cancer (GC) is the fourth most common malignancy worldwide, with 80% mortality rate in over 70% countries. Recently, targeted therapy for GC has great clinical prospects, and it is still badly needed to find novel molecular targets to control the progression and development of GC. Kinesin family member 3B (KIF3B) is known as a microtubule motor kinesin and one of the most ubiquitously expressed KIFs. KIF3B participates in multiple cellular processes such as mitosis and spermatogenesis, and the possible role of KIF3B on tumor progression has been widely revealed. KIF3B affects the progression and metastasis of multiple types of tumors, such as pancreatic cancer, prostate cancer, and hepatocellular carcinoma; however, its potential impact on GC is still unknown. Herein, we explored the possible role of KIF3B on the progression of GC and noticed that KIF3B was high expression in tumor tissues from GC patients. KIF3B was also significantly correlated with clinical pathological characteristics such as tumor size (P = .014*) and recurrence (P = .044*). We further revealed that KIF3B depleted GC cells exhibited impaired proliferation capacity in vitro. Similarly, KIF3B depletion suppressed tumor growth of GC cells in mice. In conclusion, we identified KIF3B as a promising therapeutic target for the treatment of GC.

Mutant ACTB mRNA 3′-UTR promotes hepatocellular carcinoma development by regulating miR-1 and miR-29a

In recent years, studies demonstrate that ACTB has been found to be associated with various tumors. Although ACTB is dysregulated in numerous cancer types, limited data are available on the potential function and mechanism of ACTB in hepatocellular carcinoma (HCC). This study evaluated the expression and biological roles of mutant ACTB mRNA 3′-UTR in HCC. Transcriptome sequence and qRT-PCR analysis determined that mutant ACTB mRNA ′-UTR was high expression in tumor tissues. Luciferase reporter assay showed that the ACTB mRNA 3′-UTR mutations made it easier to interact with miR-1 and miR-29a. Moreover, mutant ACTB mRNA ′-UTR regulated miR-1 and miR-29a degradation via AGO2. Furthermore, mutant ACTB mRNA 3′-UTR promoted hepatocellular carcinoma cells migration and invasion in vitro and in vivo by up-regulating miR-1 target gene MET and miR-29a target gene MCL1. In a word, our study demonstrates that 3′-UTR of ACTB plays a key role in the development of hepatocellular carcinoma (HCC) and highlights the molecular mechanisms underlying such a complex process.

Clinical value of detecting IQGAP3, B7-H4 and cyclooxygenase-2 in the diagnosis and prognostic evaluation of colorectal cancer

BackgroundThe IQ-motif-containing GTPase-activating protein (IQGAP) family comprises three members, IQGAP1, IQGAP2 and IQGAP3. IQGAP3 is the latest addition to the family. This study mainly investigated the novel marker IQGAP3 at serum and tumor tissue levels compared with the markers B7-H4 and cyclooxygenase-2 (COX-2) in patients with colorectal cancer (CRC) and in healthy individuals, aiming to evaluate the diagnostic and prognostic value of IQGAP3 for CRC.Materials and methodsSerum samples were collected prior to any therapy in 118 CRC patients and as part of a routine examination in 85 healthy individuals. Serum IQGAP3, B7-H4 and COX-2 levels were measured using commercially available ELISA kits. Immunohistochemistry was performed to detect the IQGAP3, B7-H4 and COX-2 in tumor tissues and normal para-carcinoma tissues. The receiver operating characteristics (ROC) curve and the area under the curve (AUC) were used to evaluate and compare the diagnostic value of different serum tumor markers. Univariate and multivariate analyses were performed to identify the prognostic risk factors for CRC.ResultsIQGAP3, B7-H4 and COX-2 showed low or high expression in tumor tissues while no expression in normal para-carcinoma tissues. Serum levels of IQGAP3 in CRC group were significantly higher than those in healthy control group (P < 0.001). The IQGAP3 AUC was 0.799, while the B7-H4 AUC was 0.795 and the COX-2 AUC was 0.796. IQGAP3 seemed to be superior to B7-H4 and COX-2 in detecting CRC, with the highest sensitivity among the three markers. Multivariate analysis showed that T stage, N stage, differentiation degree, TNM stage and both serum and tissue IQGAP3, B7-H4 and COX-2 levels were significant prognostic factors for CRC.ConclusionsIQGAP3 has a better diagnostic efficacy than B7-H4 and COX-2 in detecting CRC and it has value in predicting the prognosis of patients with CRC.

Clinical Prognostic Significance of HOXC9 Expression in Patients with Colorectal Cancer

Colorectal cancer (CRC) involves the abnormal expression of a set of genetic and epigenetic genes, which may be useful for predicting prognosis. The transcription factor homeobox C9 (HOXC9) is a member of the homeobox family and participates in diverse cellular metabolic processes. In the current study, the prognostic value of HOXC9 in CRC was evaluated by analyzing public data from The Cancer Genome Atlas. The correlation between clinical features and HOXC9 expression levels was evaluated by logistic regression. Kaplan-Meier and Cox regression was performed to determine the association between HOXC9 expression and patient prognosis. Gene set enrichment analysis was conducted to explore the function of HOXC9 in CRC. HOXC9 showed higher expression in tumor tissue than in normal tissue. An increased level of HOXC9 in CRC was notably associated with an advanced tumor stage (OR = 1.58, for stage I/II vs. stage III/IV, p = 0.037), increased risk of distant metastasis (odds ratio = 1.84, for T1/T2 vs. T3/T4, p = 0.025), and tendency for venous invasion (OR = 2.25, p = 0.003). Kaplan-Meier analysis revealed that higher HOXC9 levels were predictive of poor overall (p = 0.0083) and progression-free survival (p = 0.0014). Multivariate COX regression model analysis proved that HOXC9 was independently associated with overall survival (hazard ratio = 2.88, 95% confidence interval: 1.14 - 7.29, p = 0.025). Gene set enrichment analysis showed that several biological function symbols were particularly enriched in the increased HOXC9 phenotype. HOXC9 may play a critical role in CRC progression and serve as a novel potential marker of poor prognosis in CRC.