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BACKGROUND: Our previous studies show that microRNA-92a (miR-92a) is overexpressed in colorectal cancer (CRC) and is thought to be correlated with the development of the cancer. However, its biological role in CRC remains poorly understood. AIMS: The aim of the study was to determine the role of miR-92a and to elucidate its regulatory mechanism in CRC. METHODS: The expression levels of miR-92a and phosphatase and tensin homologue (PTEN) were detected by qRT-PCR and western blot. MTT, migration and invasion assays were used to examine the proliferation, migration and invasion of pre-miR-92a transfected SW480 cells, and a mouse model was used to investigate tumorigenesis. In addition, the regulation of PTEN by miR-92a was evaluated by qRT-PCR, western blot and luciferase reporter assays. RESULTS: The expression of miR-92a was significantly up-regulated in the tissues of CRC patients with lymph node metastasis. The ectopic expression of miR-92a enhanced CRC cell proliferation, migration and invasion. Similar results were found in xenograft assay performed in nude mice. Up-regulation of miR-92a induced EMT in CRC cells. There was an inverse correlation between the levels of miR-92a and PTEN in CRC tissues. The overexpression of miR-92a in CRC cells decreased PTEN expression at the translational level, and decreased PTEN-driven luciferase-reporter activity. CONCLUSIONS: Our results demonstrated that miR-92a induced EMT and regulated cell growth, migration and invasion in the SW480 cells, at least partially, via suppression of PTEN expression. MiR-92a may serve as a novel therapeutic target in colorectal cancer.
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Carcinoma/metabolismo , Neoplasias Colorretais/metabolismo , MicroRNAs/metabolismo , Oncogenes , PTEN Fosfo-Hidrolase/antagonistas & inibidores , PTEN Fosfo-Hidrolase/metabolismo , Carcinoma/etiologia , Movimento Celular/genética , Proliferação de Células , Transformação Celular Neoplásica , Neoplasias Colorretais/etiologia , Transição Epitelial-Mesenquimal , Células HCT116 , Células HT29 , Humanos , Invasividade Neoplásica , Pesquisa Translacional BiomédicaRESUMO
OBJECTIVES: MicroRNAs regulate gene expression at the post-transcriptional level and play important roles in cancer development, progression, and metastasis. The aim of this study was to investigate the expression of miR-92a in colorectal cancer and the normal adjacent mucosa and its potential relevance to clinicopathological characteristics and patient survival. METHODS: Surgical specimens of cancer tissue and adjacent normal mucosa were obtained from 82 patients with colorectal carcinomas. The relative expression levels of miR-92a mRNA in the cancer and the normal adjacent mucosa were measured by quantitative real-time reverse transcriptase polymerase chain reaction. We analyzed their correlation with tumor metastasis, clinicopathologic parameters, and clinical outcome. RESULTS: The relative expression levels of miR-92a were significantly higher in colorectal cancer tissues than in the normal adjacent mucosa (p < 0.001), and a high expression of miR-92a correlated with advanced clinical stage (p = 0.025), lymph node metastases (p = 0.015), and distant metastases (p = 0.046). Kaplan-Meier analysis indicated that patients with high miR-92a expression had a poor overall survival (p = 0.001). Moreover, multivariate analysis showed that increased expression of miR-92a was an independent predictor of overall survival. CONCLUSION: This study revealed that miR-92a overexpression was correlated with specific colorectal cancer biopathologic features, such as TNM stage, lymph node and distant metastases, and poor survival of the patients, indicating that miR-92a may serve as a molecular prognostic marker for colorectal cancer and disease progression.
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Biomarcadores Tumorais/metabolismo , Neoplasias Colorretais/metabolismo , Mucosa Intestinal/metabolismo , MicroRNAs/metabolismo , Adulto , Idoso , Neoplasias Colorretais/genética , Neoplasias Colorretais/mortalidade , Neoplasias Colorretais/patologia , Feminino , Regulação Neoplásica da Expressão Gênica , Humanos , Mucosa Intestinal/patologia , Metástase Linfática , Masculino , Pessoa de Meia-Idade , Metástase Neoplásica , Prognóstico , Reação em Cadeia da Polimerase em Tempo Real , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Análise de Sobrevida , Regulação para CimaRESUMO
Zinc finger proteins (ZNFs) serve key roles in tumor formation and progression; however, the functions and underlying mechanisms of dysregulated ZNF384 in colorectal cancer (CRC) are yet to be fully elucidated. Therefore, the present study initially aimed to investigate the expression levels of ZNF384 in CRC samples. Moreover, lentiviral ZNF384 overexpression and ZNF384 knockdown models were established in CRC cells. Transwell, wound healing and in vivo tail vein metastasis assays were carried out to evaluate the effects of ZNF384 on CRC cell metastasis. Furthermore, reverse transcriptionquantitative PCR, western blotting, serial deletion, sitedirected mutagenesis, dualluciferase reporter and chromatin immunoprecipitation assays were conducted to investigate the potential underlying mechanisms. The results of the present study demonstrated that ZNF384 expression was markedly increased in CRC samples and this was associated with a poor prognosis. Notably, ZNF384 overexpression increased the levels of CRC cell invasion and migration, whereas ZNF384 knockdown inhibited CRC development. Moreover, the results of the present study demonstrated that ZNF384 mediated the expression of MMP2. MMP2 knockdown inhibited ZNF384mediated CRC cell invasion and migration, whereas MMP2 overexpression ameliorated ZNF384 knockdowninduced inhibition of CRC progression. In addition, the results of the present study demonstrated that hypoxiainducible factor 1α (HIF1α) had the ability to bind to the ZNF384 promoter, thereby initiating ZNF384 expression. In humanderived CRC samples, the expression levels of ZNF384 were positively correlated with both MMP2 and HIF1α expression. Collectively, these findings highlighted that ZNF384 may act as a prognostic marker and regulator of CRC metastasis.
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Neoplasias Colorretais/genética , Neoplasias Colorretais/patologia , Metaloproteinase 2 da Matriz/metabolismo , Transativadores/genética , Dedos de Zinco/genética , Linhagem Celular Tumoral , Proliferação de Células/genética , Regulação Neoplásica da Expressão Gênica , Humanos , Invasividade Neoplásica , Regulação para CimaRESUMO
Colorectal cancer (CRC) is one of the most frequent gastrointestinal cancers. MicroRNAs (miRNAs) have been proved to be unusually expressed in CRC progression and thus alter multiple pathological processes in CRC cells. However, the specific roles and mechanisms of miR-22 in CRC have not been clearly reported. MicroRNA-22 (miR-22) and MYC-associated factor X (MAX) expressions were determined by RT-qPCR in CRC tissues and cells. The targeted regulatory effects of miR-22 and MAX were confirmed by luciferase reporter and coimmunoprecipitation assays. Also, gain- and loss-of-function and rescue experiments were used to elucidate the function and mechanism of miR-22 and MAX in CRC cells and the mouse xenograft model. We discovered that miR-22 was hypermethylated and downregulated, while MAX was upregulated in CRC. miR-22 markedly inhibited migration, invasion, glycolysis, and cancer stem cell transcription factors in CRC cells. In addition, it was found that miR-22 can directly target MAX. Additional functional experiments confirmed that MAX overexpression can rescue the effects of miR-22 on the behavior of CRC cells. This study suggested that miR-22, as a cancer suppressor, participates in CRC progression by targeting MAX, which might provide basic information for therapeutic targets for CRC.
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Fatores de Transcrição de Zíper de Leucina e Hélice-Alça-Hélix Básicos , Neoplasias Colorretais , Transição Epitelial-Mesenquimal , MicroRNAs , Animais , Fatores de Transcrição de Zíper de Leucina e Hélice-Alça-Hélix Básicos/genética , Linhagem Celular Tumoral , Movimento Celular , Proliferação de Células , Neoplasias Colorretais/patologia , Regulação Neoplásica da Expressão Gênica , Humanos , Camundongos , MicroRNAs/genéticaRESUMO
ABBREVIATIONS: CRC, cancer cell; CSCs, cancer stem cells; SOCS3, suppressor of cytokine signaling 3.
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Neoplasias Colorretais , MicroRNAs , Proteína 3 Supressora da Sinalização de Citocinas , Linhagem Celular Tumoral , Proliferação de Células , Neoplasias Colorretais/genética , Regulação Neoplásica da Expressão Gênica , Humanos , MicroRNAs/genética , Proteína 3 Supressora da Sinalização de Citocinas/genética , Proteína 3 Supressora da Sinalização de Citocinas/metabolismoRESUMO
Nmethyl Daspartate receptors (NMDARs) are closely associated with the development, growth and metastasis of cancer. Glutamate receptor, ionotropic, Nmethyl Daspartateassociated protein 1 (GRINA) is a member of the of the NMDAR family, and its aberrant expression is associated with gastric cancer. However, the role of GRINA in colorectal cancer (CRC) is not completely understood. In the present study, expression profiles of GRINA in several CRC databases were obtained and further verified using clinical CRC samples. The effects of GRINA overexpression on CRC progression both in vivo and in vitro were assessed. Briefly, cell proliferation was detected using MTT assay, and cell migration and invasion ability were evaluated by wound healing and Transwell assay. In addition, the molecular mechanism underlying the upregulated expression of GRINA in CRC was investigated. The regulatory association between GRINA and miR2963p was detected by luciferase assay, reverse transcriptionquantitative PCR and western blotting. The results demonstrated that GRINA expression levels were significantly increased in tumor samples compared with those in healthy samples, and upregulated expression of GRINA was associated with a less favorable prognostic outcome in patients with CRC. GRINA overexpression significantly increased CRC cell proliferation, invasion and migration. Additionally, it was determined that GRINA was posttranscriptionally regulated by microRNA (miR)2963p. Together, the results of the present study suggested the potential importance of the miR2963p/GRINA axis and highlighted potential novel targets for the management of CRC.
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Neoplasias Colorretais/metabolismo , Ácido D-Aspártico/metabolismo , MicroRNAs/metabolismo , Receptores de Glutamato/metabolismo , Receptores Ionotrópicos de Glutamato/metabolismo , Receptores de N-Metil-D-Aspartato/metabolismo , Animais , Apoptose/genética , Linhagem Celular Tumoral , Movimento Celular/genética , Proliferação de Células/genética , Neoplasias Colorretais/patologia , Ácido D-Aspártico/genética , Feminino , Regulação Neoplásica da Expressão Gênica , Células HEK293 , Humanos , Masculino , Camundongos , Camundongos Endogâmicos BALB C , Camundongos Nus , MicroRNAs/genética , Pessoa de Meia-Idade , Prognóstico , Receptores Ionotrópicos de Glutamato/genética , Receptores de N-Metil-D-Aspartato/genética , Neoplasias Gástricas/genética , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
Colorectal cancer (CRC) is one of the most common types of malignancy worldwide and has a poor prognosis. Non-SMC condensing I complex subunit G (NCAPG) has been reported to be upregulated in numerous types of malignant tumor. However, to the best of our knowledge, its clinicopathological and biological significance in CRC remain to be elucidated. The results of the present study revealed that NCAPG expression levels were upregulated in human CRC tissues and cell lines. The upregulated expression of NCAPG was positively associated with patient clinicopathological characteristics, such as differentiation and tumor size, and independently associated with poor survival. Consistent with the clinical observations, NCAPG was discovered to promote the proliferation and inhibit the apoptosis of CRC cells. Moreover, NCAPG-knockdown inhibited CRC cell proliferation by regulating the PI3K/AKT signaling pathway. Furthermore, NCAPG was identified as a potential target of microRNA (miR)-23b-3p, which was subsequently demonstrated to negatively regulate NCAPG expression. In conclusion, the findings of the current study indicated that the miR-23b-3p/NCAPG/PI3K/AKT signaling axis may play an important role in CRC carcinogenesis, and the status of the molecule may represent a promising prognostic marker for the disease.
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PURPOSE: Colorectal cancer (CRC) is one of the most common malignancies in the world. The prognosis of advanced CRC is still poor. The purpose of this study was to identify a gene expression profile associated with CRC that may contribute to the early diagnosis of CRC and improve patient prognosis. PATIENTS AND METHODS: Five pairs of CRC tissues and paracancerous tissues were used to identify causative genes using microarray assays. The prognostic value of Cytochrome C Oxidase Assembly Factor 1 Homolog (COA1) in CRC was assessed in 90 CRC patients. Loss-of-function assays, cell proliferation assays using Celigo and MTT, colony formation assays, a subcutaneous xenograft mouse model, and apoptosis assays were used to define the effects of downregulation of COA1 in CRC cells in vitro and in vivo. The underlying molecular mechanisms of COA1 in CRC were also investigated. RESULTS: The causative gene COA1 was identified through microarray analysis. COA1 expression in CRC was notably associated with pathologic differentiation, tumor size, and tumor depth. COA1 expression may act as an independent prognostic factor for overall survival of CRC. Knockdown of COA1 inhibited the proliferation of CRC cells in vitro and the tumorigenicity of CRC cells in vivo. Decreased COA1 expression induced apoptosis of CRC cells. Based on the microarray assay results comparing HCT116 cells transfected with lentivirus encoding anti-COA1 shRNA or negative control shRNA, ingenuity pathway analysis (IPA) revealed that the PI3K/AKT signaling pathway was significantly enriched. Moreover, CCND1, mTOR, AKT1, and MDM2 were identified as the downstream genes of COA1. CONCLUSION: These findings demonstrate that COA1 promotes CRC cell proliferation and inhibits apoptosis by regulating the PI3K/AKT signaling pathway. Our results implicate COA1 as a potential oncogene involved in tumor growth and progression of CRC.
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MicroRNAs have recently emerged as regulators of many biological processes including cell proliferation, development and differentiation. This study identified that miR-22 was statistically decreased in colorectal cancer clinical specimens and highly metastatic cell lines. Moreover, low miR-22 expression was associated with tumor metastasis, advanced clinical stage and relapse. Consistent with clinical observations, miR-22 significantly suppressed the ability of colorectal cancer cells to growth and metastasize in vitro and in vivo. Sp1 was validated as a target of miR-22, and ectopic expression of Sp1 compromised the inhibitory effects of miR-22. In addition, Sp1 repressed miR-22 transcription by binding to the miR-22 promoter, hence forming a negative feedback loop. Further study has shown that miR-22 suppresses the activity of PTEN/AKT pathway by Sp1. Our present results implicate the newly indentified miR-22/Sp1/PTEN/AKT axis might represent a potential therapeutic target for colorectal cancer.
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Neoplasias Colorretais/genética , Neoplasias Colorretais/metabolismo , Regulação Neoplásica da Expressão Gênica , MicroRNAs/genética , Fator de Transcrição Sp1/metabolismo , Animais , Linhagem Celular Tumoral , Movimento Celular , Proliferação de Células , Neoplasias Colorretais/mortalidade , Neoplasias Colorretais/patologia , Modelos Animais de Doenças , Progressão da Doença , Feminino , Humanos , Camundongos , Modelos Biológicos , Metástase Neoplásica , PTEN Fosfo-Hidrolase/metabolismo , Prognóstico , Regiões Promotoras Genéticas , Ligação Proteica , Proteínas Proto-Oncogênicas c-akt/metabolismo , Interferência de RNA , Recidiva , Transdução de Sinais , Fator de Transcrição Sp1/genéticaRESUMO
We previously reported the oncogenic function of miR-92a in colorectal cancer. This study identified that miR-92a was upregulated in chemoresistant colorectal cancer cells and tissues. Ectopic expression of miR-92a conferred resistance to 5-fluorouracil-induced apoptosis in vitro, while antagomiR-92a significantly enhanced chemosensitivity in vivo. Moreover, Overexpression of miR-92a promoted the tumor sphere formation and the expression of stem cell markers. MiR-92a overexpression also displayed higher tumourigenesis in vivo. Furthermore, we demonstrated that miR-92a upregulates the Wnt/ß-catenin signaling activity via directly targeting KLF4, GSK3ß and DKK3, which are multiple level negative regulators of the Wnt/ß-catenin signaling cascade. In addition, our results indicate IL-6/STAT3 pathway increases miR-92a expression by directly targeting its promoter, resulting in Wnt/ß-catenin signaling activation and consequent promotion of stem-like phenotypes of colorectal cancer cells. Our present results suggest the essential role of IL-6/STAT3/miR-92a/Wnt/ß-catenin pathway in regulating the stem cell-like traits of colorectal cancer cells and provide a potential target for colorectal cancer therapy.
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BACKGROUND: The minilaparotomy approach is technically feasible for the resection of rectal cancer in selected patients with rapid postoperative recovery and small incision. The study aimed to compare the clinical and oncological outcomes of minilaparotomy and laparoscopic approaches in patients with rectal cancer. METHODS: The 122 included patients with rectal cancer were assigned to either minilaparotomy group (n=65) or laparoscopic group (n=57) which ran from January 2005 to January 2008. Clinical characteristics, perioperative outcomes, postoperative and long-term complications, pathological results and survival rates were compared between the groups. RESULTS: The demographic data of the two groups were similar. The time to normal diet (P=0.024) and the hospital stay (P=0.043) were less in the laparoscopic group than that in the minilaparotomy group. Compared with the minilaparotomy group, the mean operation time was significantly longer [low anterior resection (LAR), P=0.030; abdominoperineal resection (APR), P=0.048] and the direct costs higher for laparoscopic group (P<0.001). The morbidity and mortality were comparable between the two groups. Local recurrence was similar (5.3% laparoscopic, 1.5% minilaparotomy, P=0.520). The 5-year overall and disease-free survival rates were also similar (overall survival is 87.1% in laparoscopic group, and 82.5%in minilaparotomy group, P=0.425; disease-free survival is 74.2% in the laparoscopic group, and 71.4% in mini- laparotomy group, P=0.633). CONCLUSIONS: The minilaparotomy approach was similarly safe and oncologically equivalent to laparoscopic approach for patients with rectal cancer. At the expense of a longer operative time and higher cost, laparoscopic surgery was associated with faster postoperative recovery.
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It has been demonstrated that there are abundant stable microRNAs (miRNAs) in plasma/serum, which can be detected and are potentially disease-specific. The aim of this study was to investigate whether plasma miR-200c and miR-18a can be used as biomarkers for the detection of colorectal carcinoma (CRC). This study was divided into three parts: i) confirmation of higher miR-200c and miR-18a levels in primary CRC tissues compared to normal colorectal tissues; ii) evaluation of plasma miR-200c and miR-18a expression by comparing 78 patients with 86 healthy volunteers and iii) comparison of miR-200c and miR-18a levels in paired pre-and post-operative plasma in cancer patients who underwent curative CRC resection. Results showed that the expression of miR-200c and miR-18a was significantly higher in CRC compared to normal tissues. The plasma levels of miR-200c and miR-18a were significantly higher in CRC patients compared to controls. miR-200c yielded an area under the receiver-operating characteristics (ROC) curve (AUC) of 0.749 and miR-18a yielded an AUC of 0.804 when distinguishing CRC patients from the controls. Combined ROC analyses using the two miRNAs revealed an elevated AUC of 0.839 with 84.6% sensitivity and 75.6% specificity in discriminating CRC. Plasma levels of miR-200c and miR-18a were significantly lower in post-operative compared to pre-operative samples. The results of this study suggest that plasma miR-200c and miR-18a are significantly elevated in the plasma of CRC patients and that they may serve as non-invasive molecular markers for CRC screening.
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OBJECTIVE: To compare the clinical and oncological outcomes between laparoscopic and open intersphincteric resection in patients with low rectal cancer. METHODS: From January 2007 to January 2010, patients with low rectal cancer treated by laparoscopic or open intersphincteric resection were included in a retrospective comparative study. Patients were classified into laparoscopy group (n=27) and open group (n=41). The operative procedures, postoperative complications, anal function and clinicopathological data were compared. RESULTS: Compared to the open group, the laparoscopic group had longer operative time [(242.2±42.5) min vs. (199.1±44.3) min, P=0.000], less blood loss [(150.5±102.2) ml vs. (258.4±149.2) ml, P=0.002], faster recovery of bowel function [(2.9±1.1) d vs. (3.6±1.5) d, P=0.032] and resumption of regular diet [(6.6±1.2) d vs. [(7.5±1.7) d, P=0.012], and shorter postoperative hospital stay [(7.7±1.4) d vs. (9.1±2.4) d, P=0.006]. The postoperative complication rate between the laparoscopic and open groups was not significantly different [18.5% (5/27) vs. 19.5% (8/41), P=0.464]. Oncological parameters were comparable between the two groups including lymph node harvested [(14.1±4.1) vs. (16.4±6.8), P=0.113], distal resection margin [(1.4±0.7) cm vs. (1.6±0.8) cm, P=0.311], and circumferential margin [7.4% (2/27) vs. 2.4% (1/41), P=0.709]. Local recurrence rates in laparoscopic and open groups were 7.4% (2/27) and 2.4% (1/41), and distant metastasis rates were 0 and 4.9% (2/41) respectively, and the differences were not significant (both P>0.05). CONCLUSIONS: Laparoscopic intersphincteric resection possesses same efficacy of open intersphincteric resection with less blood loss, shorter recovery time and hospital stay, and similar oncological outcomes, and no increased postoperative morbidity and mortality.
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Laparoscopia , Laparotomia , Neoplasias Retais/cirurgia , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Prognóstico , Estudos RetrospectivosRESUMO
Zinc finger E-box binding homeobox 1 (ZEB1) has been shown to promote invasion and metastasis in several types of human cancer and to have a prognostic role in certain cancers. However, the clinical significance of ZEB1 in colorectal cancer (CRC) has not been sufficiently investigated. This study aimed to address this issue. In this study, we compared the expression of ZEB1 between CRC tissues and normal adjacent mucosa using quantitative real-time RT-PCR. The association of ZEB1 expression with clinicopathological characteristics was analyzed by appropriate statistical analyses. Kaplan-Meier analysis and Cox proportional hazards regression models were used to investigate the association of ZEB1 expression with survival of patients. The results showed that the relative expression levels of ZEB1 were significantly higher in CRC tissues compared to the normal adjacent mucosa and higher expression of ZEB1 correlated with liver metastasis. Kaplan-Meier analysis indicated that patients with high ZEB1 had a poor overall survival. Moreover, the multivariate analysis showed that high expression of ZEB1 was an independent predictor of overall survival. Our data indicate the potential of ZEB1 as a novel prognostic biomarker for CRC.
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Human microRNA-155 (miR-155) has been demonstrated to regulate a variety of cellular functions, including epithelial-to-mesenchymal transition (EMT) by targeting multiple messenger RNAs (mRNAs). However, its role in colorectal cancer (CRC) remains unelucidated. Therefore, the aim of the present study was to investigate the effects of miR-155 on CRC cells. The expression level of miR-155 was quantified by quantitative real-time reverse transcriptase-PCR (qRT-PCR) in primary CRC tissues and normal adjacent mucosa. MTT, migration and invasion assays were used to examine the proliferation, migration and invasion of SW480 cells transfected with miR155. The expression of miR-155 was significantly upregulated in the CRC tissues and the high expression of miR-155 correlated with an advanced clinical stage, lymph node and distant metastases. The ectopic expression of miR-155 enhanced the migration and invasive ability of the SW480 cells and altered their morphological appearance; however, cell proliferation was not affected. E-cadherin expression levels decreased, while ZEB1 expression levels increased in the SW480 cells overexpressing miR-155. Furthermore, the overexpression of miR-155 upregulated claudin-1 expression. Thus, our data suggest that miR-155 plays an important role in promoting CRC cell migration and invasion, at least in part through the regulation of claudin-1 expression and controlling metastasis in CRC.
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Movimento Celular/genética , Claudina-1/genética , Neoplasias Colorretais/genética , Neoplasias Colorretais/patologia , Regulação Neoplásica da Expressão Gênica , MicroRNAs/genética , Idoso , Caderinas/genética , Caderinas/metabolismo , Linhagem Celular Tumoral , Proliferação de Células , Claudina-1/metabolismo , Neoplasias Colorretais/metabolismo , Feminino , Proteínas de Homeodomínio/genética , Proteínas de Homeodomínio/metabolismo , Humanos , Masculino , Pessoa de Meia-Idade , Invasividade Neoplásica , Fatores de Transcrição/genética , Fatores de Transcrição/metabolismo , Homeobox 1 de Ligação a E-box em Dedo de ZincoRESUMO
MicroRNAs (miRNAs) are non-coding RNAs that have been shown to be aberrantly expressed in several tumor types. Of these miRNAs, miR-22 as tumor suppressor has been shown to play a crucial role in human carcinogenesis. However, its association with the clinicopathological features of colorectal cancer has yet to be addressed. In this study, we compared the expression of miR-22 between colorectal cancer tissues and the normal adjacent mucosa using a quantitative real-time RT-PCR. The association of miR-22 expression with clinicopathological characters was analyzed by appropriate statistical analysis. Kaplan-Meier analysis and Cox proportional hazards regression models were used to investigate the associations of miR-22 expression with survival of patients. Results showed that the relative expression levels of miR-22 were significantly lower in colorectal cancer tissues than those in the normal adjacent mucosa, and low expression of miR-22 correlated with liver metastasis. Kaplan-Meier analysis indicated that patients with reduced miR-22 had a poor overall survival. Moreover, the multivariate analysis showed that reduced expression of miR-22 was an independent predictor of overall survival. Our data indicate the potential of miR-22 as a novel prognostic biomarker for CRC.