Prognostic value of tripartite motif containing 29 expression in patients with gastric cancer following surgical resection

  • Authors:
    • Chenghu Wang
    • Yi Zhou
    • Beibei Chen
    • Weiwei Yuan
    • Jinxi Huang
  • View Affiliations

  • Published online on: February 15, 2018     https://doi.org/10.3892/ol.2018.8059
  • Pages: 5792-5798
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Abstract

Tripartite motif containing 29 (TRIM29) dysregulation serves an important function in the progression of numerous types of cancer, but its function in the prognosis of patients with gastric cancer remains unknown. The present study assessed the prognostic value of TRIM29 in patients with gastric cancer following surgical resection. A total of 243 fresh gastric adenocarcinoma and adjacent normal tissues were continuously retrieved from patients who underwent curative surgery for gastric cancer at the Cancer Hospital of Henan Province (Zhengzhou, China) between January 2005 and December 2011. The reverse transcription‑quantitative polymerase chain reaction was performed to assess TRIM29 expression. The association between TRIM29 expression and clinicopathological features and prognosis was subsequently evaluated. The results of the present study revealed that the expression of TRIM29 was increased in the gastric cancer tissues compared with the normal adjacent tissues, and that upregulated expression of TRIM29 was associated with tumor cell differentiation, tumor stage, lymph node metastasis, and tumor‑node‑metastasis (TNM) stage. In the training and validation data, high TRIM29 expression was associated with poor overall survival in patients with gastric cancer. Furthermore, multivariate analysis identified that TRIM29 expression was an independent prognostic factor for overall survival, in addition to TNM stage and Lauren classification. Combining TRIM29 expression with the TNM staging system generated a novel predictive model that exhibited improved prognostic accuracy for overall survival in patients with gastric cancer. The present study revealed that TRIM29 was an independent adverse prognostic factor in patients with gastric cancer. Incorporating TRIM29 expression level into the TNM staging system may improve risk stratification and render prognosis more accurate in patients with gastric cancer.

Introduction

Despite advances in surgery, chemoradiotherapy, and molecular-targeted therapy, the prognosis for patients with advanced gastric cancer tends to be poor (13). The tumor-node-metastasis (TNM) staging system of the American Joint Committee on Cancer is a useful model for predicting the prognosis of patients with gastric cancer (4,5). However, patients with gastric cancer with the same TNM stage may receive different prognoses, partly due to heterogeneity at the molecular level of the disease; an example of this is the different prognosis of patients with gastric cancer with the same TNM stage in East Asia and Europe (6,7). The identification of specific and sensitive markers to supplement the TNM stage is required to treat patients with gastric cancer more precisely.

Tripartite motif containing 29 (TRIM29), located at chromosome 11q23, was initially identified in a study researching the gene responsible for the genetic disorder ataxia telangiectasia (8). TRIM29 belongs to the TRIM protein family, which is characterized by a Really Interesting New Gene (RING) finger domain, a B-box-type zinc finger domain type (B)1, a B2, and a coiled coil region (CC) (9). Unlike the majority of TRIM proteins, TRIM29 possesses B1-B2-CC domains but lacks the RING finger domain, suggesting that TRIM29 exhibits no E3 ubiquitin ligase activity (9). TRIM29 has been demonstrated to control important cellular processes, including intracellular signaling in innate immunity and viral infection, transcriptional regulation, development, autophagy and carcinogenesis (10). Previous pathological studies have revealed that TRIM29 may be useful in the diagnosis of multiple types of cancer, including breast (11), prostate (12), pancreatic (13), lung (14) and bladder cancer (15), and esophageal squamous cell carcinoma (16). The expression and biological functions of TRIM29 differ between different types of cancer (10). A previous study demonstrated that TRIM29 expression was a marker for lymph node metastasis in gastric cancer (17). However, the function of TRIM29 in the prognosis of patients with gastric cancer remains to be fully understood and requires further study.

The present study assessed the potential function of TRIM29 expression in the prognosis of patients with resectable gastric cancer. TRIM29 expression was evaluated using the reverse transcription-quantitative polymerase chain reaction (RT-qPCR) in gastric cancer tissues. The association between TRIM29 expression and clinical outcomes in patients with gastric cancer was assessed. The results of the present study may assist in evaluating the clinical significance of TRIM29 expression in gastric cancer and provide means for a more precise prognostic system for evaluating outcomes in patients with gastric cancer.

Materials and methods

Clinical specimens

A total of 243 fresh gastric adenocarcinoma and adjacent normal tissues were continuously retrieved from patients who underwent curative surgery (R0 resection and D2 lymphadenectomy) for gastric cancer at the Cancer Hospital of Henan Province (Zhengzhou, China) between January 2005 and December 2011. All surgeries were performed according to the guidelines of the International Gastric Cancer Association and the Japanese Gastric Cancer Association (5). The patients enrolled in the present study provided written informed consent for publication and were divided into two independent sets (all clinicopathological data for the patients is provided in Table I). Tissues from the training set (n=113) were collected between January 2005 and December 2008. Tissues from the validation set (n=130) were collected between January 2009 and December 2011. The fresh cancer tissues were immediately frozen (−180°C) and stored in liquid nitrogen following resection, until further analysis. Pathological examinations were performed and the histological evaluation was reassessed independently by two gastroenterology pathologists of the Cancer Hospital of Henan Province according to the Japanese General Rules for Gastric Cancer Study in Surgery and Pathology (5), and the TNM staging system was applied according to the 2010 International Union Against Cancer TNM classification system (4). Patients were excluded if they had previously been exposed to any radiotherapy, chemotherapy, targeted therapy, or intervention therapy for gastric cancer. The present study was reviewed and approved by the Clinical Research Ethics Committee of the Cancer Hospital of Henan Province.

Table I.

Association between TRIM29 expression and clinical characteristics in patients with gastric cancer.

Table I.

Association between TRIM29 expression and clinical characteristics in patients with gastric cancer.

Training setValidation set


TRIM29 expressionTRIM29 expression


FactorLow (n)High (n)P-valueLow (n)High (n)P-value
All patients4766 6169
Age/yearsa 0.272 0.245
  ≤602035 2333
  >602731 3836
Sex 0.104 0.292
  Female3641 3849
  Male1125 2320
Localization 0.174 0.593
  Proximal37 1012
  Middle2321 1815
  Distal2138 3342
Differentiation 0.001 0.001
  Well81 157
  Moderately2525 2617
  Poorly1440 2045
Lauren classification 0.459 0.202
  Intestinal3139 2536
  Diffuse1627 3633
Tumor stage <0.001 0.016
  1+22513 167
  3+42253 4562
Lymph node metastasis 0.016 <0.001
  Negative1913 3414
  Positive2853 2755
TNM stage 0.005 0.001
  I188 146
  II917 2213
  III2041 3550
Tumor size/cma 0.157 0.316
  <4.02327 3129
  ≥4.02439 3040

a Split at median. TRIM29, tripartite motif containing 29; TNM, tumor-node-metastasis; n, number of patients.

RT-qPCR

TRIM29 expression was evaluated using RT-qPCR, which was performed as previously described (11). Briefly, total RNA containing microRNA (miRNA) was extracted from cultured cells or tissues using the miRNeasy Mini kit (Qiagen, Inc., Valencia, CA, USA), according to manufacturer's protocol. cDNA was synthesized using the miScript Reverse Transcription kit (Qiagen, Inc.) following the manufacturer's protocol. Reverse transcription was performed using 50 ng total RNA with a primer specific for TRIM29, together with the SYBR Green microRNA reverse transcription kit (Applied BioSystems; Thermo Fisher Scientific, Inc., Waltham, MA, USA), according to manufacturer's protocol. miRNAs were quantified using the SYBR Green miRNA RT-qPCR assay (Applied BioSystems; Thermo Fisher Scientific, Inc.) according to the manufacturer's protocol. The qPCR reaction was carried out on a 7500 Fast Real-time System (Applied Biosystems; Thermo Fisher Scientific, Inc.). All RT-qPCRs were performed in triplicate. The data were analyzed using an automated baseline. The threshold cycle (Cq) was defined as the fractional cycle number at which the fluorescence exceeded the given threshold. The data obtained from the RT-qPCR were analyzed using the ΔΔCq method (2ΔΔCq) (11). The primer sequences used for RT-qPCR were as follows: TRIM29 forward, 5′-ACATCATACCAGCCCTCGTC-3′ and reverse, 5′-AGCCTTTCAGGGAGAAGGAG-3′; RNA, U6 small nuclear 1 (U6) forward, 5′-GCTTCGGCAGCACATATACTAAAAT-3′ and reverse, 5′-CGCTTCACGAATTTGCGTGTCAT-3′. U6 was used as the internal control.

Statistical analysis

Statistical analysis was performed using SPSS Statistics 21.0 software (IBM Corp., Armonk, NY, USA). Pearson's χ2 tests or Fisher's exact tests were applied for categorical variables. Survival curves were constructed using the Kaplan-Meier method and the significance of the difference between survival curves was assessed using the log-rank test. Numbers at risk were calculated for the beginning of each time period. The Cox proportional hazards regression model was used for multivariate analysis. Receiver operating characteristic (ROC) analysis was used to compare the sensitivity and specificity for the prediction of overall survival by the parameters. All P-values were two-sided. P<0.05 was considered to indicate a statistically significant difference.

Results

Association between TRIM29 expression and pathological characteristics

To evaluate whether TRIM29 expression is associated with the development and progression of gastric cancer, the present study assessed TRIM29 expression in 243 patients with gastric cancer using RT-qPCR analysis. Using the results of RT-qPCR, patients were divided into high or low expression groups according to the ratio of the mean expression level of TRIM29 in their normal tissue to that in their cancer tissue (cut-off was 0.5). In the training and validation sets, 58.41 (66/113) and 53.08% (69/130) of the tumors were determined to exhibit high TRIM29 expression, respectively. The characteristics and clinicopathological features of the patients were provided (Table I). TRIM29 expression was significantly associated with tumor cell differentiation (training set, P=0.001; validation set, P=0.001), tumor stage (training set, P<0.001; validation set, P=0.016), lymph node metastasis (training set, P=0.016; validation set, P<0.001), and TNM stage (training set, P=0.005; validation set, P=0.001). Furthermore, the percentage of patients with high TRIM29 expression increased with cancer progression from TNM stage I to III in the training and validation sets (Fig. 1).

Survival analysis to evaluate the prognostic value of TRIM29 in patients with resectable gastric cancer

In the training and validation sets, high TRIM29 expression was associated with poorer overall survival than those with low TRIM29 expression (training set, P<0.001; validation set, P<0.001; Fig. 2), which suggested that TRIM29 expression influenced the clinical outcome for patients with resectable gastric cancer. Furthermore, univariate analysis demonstrated that high TRIM29 expression is a significant negative prognostic predictor for patients with gastric cancer in the training [hazard ratio (HR), 5.14; 95% confidence interval (CI), 2.49–10.63; P<0.001] and validation sets (HR, 5.22; 95% CI, 2.44–11.14; P<0.001). Furthermore, tumor cell differentiation (training set, P=0.001; validation set, P=0.010), Lauren classification (training set, P=0.002; validation set, P=0.046), tumor stage (training set, P<0.001; validation set, P=0.007), lymph node metastasis (training set, P=0.001; validation set, P<0.001), and TNM stage (training set, P<0.001; validation set, P<0.001) significantly affected the survival of patients with gastric cancer (Table II). In addition, using multivariate Cox regression analysis, Lauren classification, TNM stage, and TRIM29 expression were identified as independent and significant prognostic parameters in the training (Lauren classification: HR, 2.81; 95% CI, 1.56–5.09; P=0.001; TNM stage: HR, 4.93; 95% CI, 2.32–10.49; P<0.001; TRIM29 expression: HR, 5.68; 95% CI, 2.58–12.51; P<0.001) and validation sets (Lauren classification: HR, 1.73; 95% CI, 1.46–3.19; P=0.047; TNM stage: HR, 8.28; 95% CI, 3.16–21.70; P<0.001; TRIM29 expression: HR, 3.32; 95% CI, 1.50–7.41; P=0.003; Table III).

Table II.

Univariate Cox regression analysis for overall survival in patients with gastric cancer.

Table II.

Univariate Cox regression analysis for overall survival in patients with gastric cancer.

Overall survival

Training setValidation set


FactorHR (95% CI)P-valueHR (95% CI)P-value
Age/yearsa 0.201 0.381
  ≤601.00 1.00
  >601.45 (0.82–2.54) 1.29 (0.73–2.30)
Sex 0.357 0.876
  Female1.00 1.00
  Male1.24 (0.57–1.69) 0.95 (0.53–1.73)
Localization 0.632 0.515
  Proximal + middle1.00 1.00
  Distal1.15 (0.66–2.00) 0.90 (0.65–1.24)
Differentiation 0.001 0.010
  Well + moderately1.00 1.00
  Poorly1.67 (1.24–2.25) 1.47 (1.10–1.96)
Lauren classification 0.002 0.046
  Intestinal1.00 1.00
  Diffuse2.41 (1.38–4.21) 1.69 (1.21–3.02)
Tumor stage <0.001 0.007
  1+21.00 1.00
  3+4  7.66 (3.02–19.43) 15.25 (2.10–110.62)
Lymph node metastasis 0.001 <0.001
  Negative1.00 1.00
  Positive4.04 (1.72–9.51) 11.42 (4.06–32.13)
TNM stage <0.001 <0.001
  I+II1.00 1.00
  III3.82 (2.02–7.23) 12.30 (4.80–31.55)
Tumor size, cma 0.205 0.174
  <4.01.00 1.00
  ≥4.01.43 (0.82–2.50) 1.56 (0.72–3.50)
TRIM29 expression <0.001 <0.001
  Low1.00 1.00
  High  5.14 (2.49–10.63)   5.22 (2.44–11.14)

a Split at median. HR, hazard ratio; CI, confidence interval; TNM, tumor-node-metastasis; TRIM29, tripartite motif containing 29.

Table III.

Multivariate Cox regression analysis for overall survival in patients with gastric cancer.

Table III.

Multivariate Cox regression analysis for overall survival in patients with gastric cancer.

A, Training set

Overall survival

PatientsMultivariate analysis


FactorNo.%HR (95% CI)P-value
All training set patients113100
Differentiation 0.446
  Well + moderately  5952.21.00
  Poorly  5447.8  1.17 (0. 61 to 2.26)
Lauren classification 0.001
  Intestinal  7061.91.00
  Diffuse  4338.12.81 (1.56 to 5.09)
TNM stage <0.001
  I+II  5246.01.00
  III  6154.0  4.93 (2.32 to 10.49)
TRIM29 expression <0.001
  Low  4741.61.00
  High  6658.4  5.68 (2.58 to 12.51)

B, Validation set

Overall survival

PatientsMultivariate analysis


FactorNo.%HR (95% CI)P-value

All validation set patients130100
Differentiation 0.264
  Well + moderately  6550.01.00
  Poorly  6550.01.18 (0.88 to 1.60)
Lauren classification 0.047
  Intestinal  6146.91.00
  Diffuse  6953.11.73 (1.46 to 3.19)
TNM stage <0.001
  I+II  4534.61.00
  III  8565.4  8.28 (3.16 to 21.70)
TRIM29 expression 0.003
  Low  6146.91.00
  High  6953.13.32 (1.50 to 7.41)

[i] CI, confidence interval; HR, hazard ratio; TNM, tumor-node-metastasis; TRIM29, tripartite motif containing 29.

To develop a more sensitive predictive method for patients with gastric cancer, a novel prognostic model combining TNM stage and TRIM29 expression was constructed. ROC analysis was performed to compare its prognostic value against TNM stage or TRIM29 expression alone. The prognostic model that included TNM stage and TRIM29 expression [training set, area under the curve (AUC)=0.797; validation set, AUC=0.849] was associated with increased prognostic value compared with those that included TNM stage (training set, AUC=0.708; P=0.0100; validation set, AUC=0.763; P=0.0001) or TRIM29 expression (training set, AUC=0.712; P=0.0045; validation set, AUC=0.746; P=0.0025) alone for the training and validation sets (Fig. 3).

Discussion

Although the incidence of gastric cancer has decreased during previous decades in numerous industrialized countries, the incidence in China remains one of the highest globally, and the disease has already reached an advanced stage in the majority of patients by the time of diagnosis (13,5). The TNM staging system remains an important factor for predicting the prognosis of patients with gastric cancer (4). However, patients with gastric cancer with the same TNM stage may receive different prognoses, partly due to the heterogeneity of the disease at the molecular level (6,7). Identifying specific and sensitive markers to supplement the TNM stage is required to treat patients with gastric cancer more precisely. The present study demonstrated that TRIM29 expression in gastric cancer tissues represents a promising, independent predictor for the survival of patients with gastric cancer. High TRIM29 expression was associated with a decreased overall survival time following surgical resection. Furthermore, incorporating the TRIM29 expression level into the TNM staging system increased the prognostic value of the latter. The results of the present study suggested that TRIM29 expression may possess discriminatory power as a supplementary risk factor in patients with gastric cancer, and facilitate an increase in classification accuracy under the TNM staging system. However, the function of TRIM29 in the prognosis of patients with gastric cancer remains to be fully understood and requires further study.

A previous study identified that TRIM29 was associated with increased aggressiveness in multiple types of cancer (10). TRIM29 antagonizes multiple processes in a number of different cancer cells by regulating certain genes and influencing their functions in numerous cellular signaling pathways (1116). Another study reported that TRIM29 expression increased as normal pancreatic ductal epithelia progressed to infiltrating cancer, which suggested that upregulating TRIM29 promoted the development of invasive pancreatic cancer (18). However, the underexpression of TRIM29 in breast and prostate cancer has also been reported using serial analysis of gene expression and DNA microarray analysis (19,20). TRIM29 may induce a malignant phenotype to revert to a non-malignant phenotype in osteosarcoma and breast cancer cell lines (21). Zhou et al (22) indicated that upregulating TRIM29 expression promoted proliferation and metastasis in nasopharyngeal carcinoma via the phosphatase and tensin homolog/protein kinase B/mechanistic target of rapamycin signaling pathway. Kosaka et al (17) reported that TRIM29 expression was positively associated with a poorer histological grade, increased tumor size and invasion, and lymph node metastasis in gastric cancer. In addition, Qiu et al (23) demonstrated that TRIM29 functioned as an oncogene in gastric cancer and was regulated by microRNA-185. However, the association between TRIM29 expression and the prognosis of patients with gastric cancer has not yet been established. The results of the present study revealed that TRIM29 expression was significantly associated with tumor cell differentiation, tumor stage, lymph node metastasis, and TNM stage. Furthermore, an increased percentage of patients with high TRIM29 expression was associated with cancer progression from TNM stage I to III in the training and validation sets. However, elucidating the mechanism underlying the dysregulation of TRIM29 expression in gastric cancer tissues requires further study.

In the present study, all samples were collected from patients at the Cancer Hospital of Henan Province and all surgeries were performed according to the guidelines of the International Gastric Cancer Association and the Japanese Gastric Cancer Association. Immediately following resection of the gastric cancer specimens from the patients, the fresh cancer tissues were frozen and stored in liquid nitrogen until analysis. Prior to RT-qPCR analysis, the specimens were evaluated independently by two gastroenterology pathologists blind to clinicopathological patient data. In addition, the experiment was repeated three times with each gastric cancer tissue. However, the present study is limited in certain respects. To begin, the present study is retrospective, and selection bias may not be entirely eliminated. Secondly, data on disease-free survival were not included in the present study and should be collected in subsequent studies. Finally, few patients were enrolled in the present study, confirming the results of which requires large, randomized controlled trials.

To conclude, the results of the present study revealed that TRIM29 expression was associated with unfavorable prognosis and may be adopted as a novel prognostic indicator in patients with resectable gastric cancer. Furthermore, incorporating TRIM29 expression level into the TNM staging system increased the prognostic value of the latter for patients with resectable gastric cancer.

Acknowledgements

Not applicable.

Funding

The present study was supported by the Basic and Advanced Technology Research Project of Science and Technology Department of Henan Province (grant no. 142300410276).

Availability of data and materials

All data generated or analyzed during this study are included in this published article.

Authors' contributions

CW and YZ acquired, analyzed and interpreted the data, performed statistical analysis and drafted the manuscript. BC and WY offered technical and material support. JH designed the study, analyzed and interpreted the data, drafted the manuscript, obtained funding and supervised the study.

Ethics approval and consent to participate

The present study was reviewed and approved by the Clinical Research Ethics Committee of the Cancer Hospital of Henan Province. All patients provided written informed consent to participate.

Consent for publication

All patients provided written informed consent.

Competing interests

The authors declare that they have no competing interests.

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Wang C, Zhou Y, Chen B, Yuan W and Huang J: Prognostic value of tripartite motif containing 29 expression in patients with gastric cancer following surgical resection. Oncol Lett 15: 5792-5798, 2018
APA
Wang, C., Zhou, Y., Chen, B., Yuan, W., & Huang, J. (2018). Prognostic value of tripartite motif containing 29 expression in patients with gastric cancer following surgical resection. Oncology Letters, 15, 5792-5798. https://doi.org/10.3892/ol.2018.8059
MLA
Wang, C., Zhou, Y., Chen, B., Yuan, W., Huang, J."Prognostic value of tripartite motif containing 29 expression in patients with gastric cancer following surgical resection". Oncology Letters 15.4 (2018): 5792-5798.
Chicago
Wang, C., Zhou, Y., Chen, B., Yuan, W., Huang, J."Prognostic value of tripartite motif containing 29 expression in patients with gastric cancer following surgical resection". Oncology Letters 15, no. 4 (2018): 5792-5798. https://doi.org/10.3892/ol.2018.8059