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Original Article Serum NDRG2 Acts As a Novel Biomarker for the Diagnosis of Patients with Gastric Cancer

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Original Article Serum NDRG2 Acts As a Novel Biomarker for the Diagnosis of Patients with Gastric Cancer Int J Clin Exp Pathol 2017;10(8):9029-9034 www.ijcep.com /ISSN:1936-2625/IJCEP0021808 Original Article Serum NDRG2 acts as a novel biomarker for the diagnosis of patients with gastric cancer Gang Wang1*, Bo Yang2*, Liangliang Wu1, Ting Jin1, Qiyan Wu1, Lijun Zhang1, Lingxiong Wang1, Chunxi Liu1, Tianyi Liu1, Shunchang Jiao1 Division of Internal Medicine, 1Laboratory of Oncology, 2Department of Oncology, Chinese PLA General Hospital, Beijing, China. *Co-first authors. Received December 14, 2015; Accepted February 25, 2016; Epub August 1, 2017; Published August 15, 2017 Abstract: Background: Gastric cancer (GC) is one of the most common digestive malignancies worldwide. N-myc downstream-regulated gene 2 (NDRG2) is a differentiation-related gene which is considered to be a metastasis sup- pressor gene. The purpose of this study was to detect the serum expression of NDRG2 and its clinical significance in the early detection of patients with GC. Methods: Serum NDRG2 expression were examined in 107 patients with GC, 52 with benign gastric disease patients, and 64 healthy volunteers using reverse transcription quantitative real-time polymerase chain reaction (qRT-PCR) and western blot analysis at mRNA and protein level, respectively. The rela- tionship between NDRG2 expression and clinicopathologic characteristics was analyzed by chi-square test. The di- agnostic value of NDRG2 was estimated via establishing the receiver operating characteristic (ROC) curve. Results: the serum NDRG2 expression was lower in GC patients than that in patients with benign disease and healthy vol- unteers both at mRNA and protein level (P<0.05). And the low NDRG2 expression was significantly associated with tumor size, lymph node metastasis and TNM stage. ROC curve manifested that NDRG2 had a high diagnostic value with an AUC of 0.896 corresponding with a sensitivity of 85.9% and a specificity of 62.6%. Conclusion: The expres- sion of NDRG2 was reduced in GC patients. Moreover, serum NDRG2 could be a potential diagnostic marker for GC. Keywords: NDRG2, diagnosis, gastric cancer Introduction member of the NDRG family, a new family of differentiation-related genes which are asso- Gastric cancer (GC) is one of the most common ciated with cell proliferation, differentiation, malignant tumors with a high incidence rate apoptosis, stress responses, and cell migra- and it is the second most common cause of tion/metastasis [6-9]. In previous studies, cancer-related deaths in Asia [1]. Most patients NDRG2 is aberrant expressed and often act as who have been clinically diagnosed are already a tumor suppressor in various types of cancers at middle or advanced stage because there such as glioblastoma, colorectal cancer, gall- were no obvious symptoms in the early stage of bladder carcinoma, breast cancer, and prostat- GC which lead to a poor prognosis. The 5-year ic carcinoma [10-14]. In addition, previous stud- survival rate is disappointingly less than 10% ies have also demonstrated that NDRG2 is globally [2]. Moreover, the clinically diagnosed down-regulated in gastric cancer tissues [15, patients may miss the best treatment opportu- nity [3]. Conventional treatments with surgery, 16]. However, little is known about the associa- chemotherapies or radiation therapy play minor tion between NDRG2 expression and diagnosis roles in improving the patients’ survival rates in GC. [4, 5]. Therefore, it is urgent to find out a spe- cific and sensitive bio-marker for the early diag- In this study, we detected the serum expression nosis of GC. of NDRG2 in GC patients, gastric benign dis- ease controls and healthy controls, and ana- N-myc downstream-regulated gene 2 (NDRG2), lyzed its relationship with clinical factors of located on human chromosome 14q11.2, is a patients. What’s more, we estimated the diag- Diagnostic value of NDRG2 in gastric cancer nostic value of NDRG2 via building a ROC curve 5’-CTGGGCTAC ACTGAGCACC-3’, reverse-5’-A- in GC. AGTGGTCGTTGAGGGCAATG-3’. The relative mRNA expression of NDRG2 was calculated Materials and methods using the 2-ΔΔCt method. Each sample was in triplicate. Patients and samples Western blot analysis This study was approved by the Ethics Com- mittee of the Chinese PLA General Hospital. All Total protein was extracted from the serum of serum specimens and clinical materials were patients with GC, benign controls and healthy obtained and used after written informed con- controls, respectively. Then the protein was sents from the patients and the Chinese PLA separated by SDS-PAGE and the brands were General Hospital was obtained. A total of 107 transferred onto nitrocellulose membranes patients who were diagnosed with GC were (Amersham Pharmacia Biotech, China). Mem- enrolled in the study. None of them had received branes were blocked in 5% non-fat milk and any radiotherapy or chemotherapy before sam- incubated with primary antibody at 4°C for pling. Tumors were classified according to the overnight. After washing for 1 h, the membrane TNM cancer staging system set by the Union of was incubated with HRP-conjugated secondary International Cancer Control. Besides, 52 antibody (Sigma) for 1 h at room temperature. patients with benign gastric diseases such as The resulting blot was visualized by ECL-Plus gastritis, gastrohelcosis, and gastric polyps, Western detection reagents (Amersham Bio- and 64 healthy volunteers were taken as sciences). benign controls and healthy controls, respec- tively. None of the control patients had formerly Statistical analysis been diagnosed with any malignancy. All statistical analyses were carried out using The blood specimens were severally obtained Origin pro 9.0. Each experiment was repeated from 107 patients with GC and 116 controls at least three times, and the data were present- and lasted for 30-60 min. Then the specimens ed as means ± SD. The differences between were centrifuged at 2000 rpm for 15 min at two groups were analyzed using Students’ t room temperature. The supernatant was trans- test. The relationship between serum NDRG2 ferred to an EP tube and stored at -80°C for expression and clinicopathological factors were further use. The data of clinicopathological fea- assessed using x2 tests or Fisher’s exact tests. tures of the GC patients including age, sex, Receiver operating characteristic (ROC) curve tumor size, histological grade, lymph node was established to determine the diagnostic metastasis, invasion depth, and TNM stage performance of serum NDRG2 levels in distin- were recorded in a database. guishing patients with GC from healthy con- trols. All P values <0.05 were considered to be RNA extraction and qRT-PCR analysis statistically significant. Total RNA was isolated from all samples by Results using mirVana miRNA Isolation Kit (Ambion, Austin, TX, USA), respectively. cDNA was gener- Expression of NDRG2 was decreased in GC ated by reverse transcription using PrimeScript patients RT (Takara, Dalian, China) according to the manufacturer’s instructions. The generated QRT-PCR was used to evaluate the mRNA cDNA was pooled and amplified by PCR. Then expression of serum NDRG2 while western blot RT-PCR reaction was conducted at the Applied was taken to measure the protein expression of Biosystems 7900 Fast Real-Time PCR system this gene in 107 GC patients, 52 benign gastric (Applied Biosystems, Foster City, California, disease patients and 64 healthy volunteers. As USA). GAPDH was taken as the internal con- shown in Figure 1, the serum NDRG2 expres- trols. The primers sequences of NDRG2 and sion was significantly lower in patients with GC GAPDH were as follows: NDRG2: forward- than that in benign gastric disease controls and 5’-ATCTCTGGACCAGCTTGCAG-3’, reverse-5’-TA- healthy controls both at mRNA and protein level TCTCGCCAGGATGTAGGC-3’; GAPDH: forward- (P<0.05). 9030 Int J Clin Exp Pathol 2017;10(8):9029-9034 Diagnostic value of NDRG2 in gastric cancer Figure 1. Serum NDRG2 expression in GC patients, benign gastric dis- ease control and healthy controls. The expression of NDRG2 was lower in patients with GC compared to that in benign controls and healthy con- trols both at mRNA (A) and protein (B, C) level (P<0.05). Relationship between NDRG2 expression and Discussion clinicopathological characteristics of patients with GC GC is one of malignant tumors threatening human health. Despite the application of variet- To further investigate whether NDRG2 was cor- ies of techniques of imaging and endoscopic related with the development of GC, we further examinations have taken effect on the diagno- analyzed the association between it with the sis of this tumor which make the survival time clinicopathological data. And all the data of of GC patients protracted, it is rather complex clinicopathological characteristics of the GC and expensive of the examination process, patients were showed in Table 1. The result especially difficult to realize the early detection showed that the low NDRG2 expression was [17, 18]. Therefore, there is limitation in the closely associated with tumor size (P=0.003), early diagnosis, judgment of recurrence and lymph node metastasis (P=0.025) and TNM evaluation of efficacy for tumors [19]. stage (P=002). However, there was no associa- tion between NDRG2 expression and patients’ NDRG2, a newly discovered gene, contains an age, gender, histological grade and invasion acyl carrier protein-like domain and can be har- depth (P>0.05, Table 1). vested from human brain tissue by clone tech- nology [20]. An increasing number of studies Diagnostic value of NDRG2 in GC had revealed that the expression of NDRG2 was abnormal in variety of tumors. For instance, To explore the diagnostic value of NDRG2 in lorentzen et al., found NDRG2 was decreased GC, ROC curve was built. The outcome showed in patients with colorectal carcinoma and relat- that NDRG2 had a high diagnostic value with an ed to the progression of the cancer [21]. NDRG2 area under the curve (AUC) value of 0.896 was considered to be reduced and involved in combing with a sensitivity of 85.9% and a spec- the development of liver cancer [22].
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