Original Article Long non-coding RNA LINC00673 promotes hepatocellular carcinoma progression and metastasis through negatively regulating mir-205
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1 Am J Cancer Res 2017;7(12): /ISSN: /ajcr Original Article Long non-coding RNA LINC00673 promotes hepatocellular carcinoma progression and metastasis through negatively regulating mir-205 Li-Guo Zhang, Xin-Ke Zhou, Ru-Jian Zhou, Hui-Zeng Lv, Wei-Peng Li Department of General Surgery, Fifth Affiliated Hospital of Guangzhou Medical University, No. 621, Harbor Road, Huangpu District, Guangzhou , China Received May 29, 2017; Accepted June 13, 2017; Epub December 1, 2017; Published December 15, 2017 Abstract: Increasing evidence demonstrates abnormal expression of long non-coding RNA (lncrna) is closely correlated with various malignancies including hepatocellular carcinoma (HCC). The present study aims to investigate the role of lncrna long intergenic noncoding RNA (LINC00673) in tumorigenesis of HCC. Quantitative realtime polymerase chain reaction (qrt-pcr) revealed LINC00673 was upregulated in HCC cancerous tissue and cell lines compared to adjacent normal tissue and normal liver cell lines. LINC00673 overexpression is associated with poor prognosis and low survival rate. LINC00673 silencing inhibited the proliferation, invasion and epithelialmesenchymal transition (EMT) of HCC cells in vitro. Bioinformatics analysis revealed that mir-205 targeted 3 -UTR of LINC Rescue experiments confirmed that mir-205 could reverse the effect of LINC00673 on HCC cells. In vivo xenograft tumor assay LINC00673 silencing reduced the tumor volume and weight. Taken together, findings indicate overexpression of LINC00673 promotes HCC cells progression by regulating mir-205, providing a prognostic biomarker and therapeutic target for HCC and is associated with poor survival of HCC patients. Keywords: Hepatocellular carcinoma, lncrna, LINC00673, mir-205, EMT, metastasis Introduction Hepatocellular carcinoma (HCC) is the fifth most common cancer and the third leading cause of cancer death in the world [1, 2]. The 5-year survival rate for HCC patients is approximately 30% and is characterized by high rates of metastasis resulting in a poor prognosis for patients [3, 4]. The underlying mechanisms of HCC metastasis is not well understood and given the high rates of diagnosis for HCC worldwide and requires further study. Non-coding RNA (ncrna) are important regulators involved in most cellular functions and modulation [5]. Typically, ncrna contains long ncrna (lncrna, more than 200 nucleotides), small ncrna (fewer than 200 nucleotides) and microrna (mirna, nucleotides). Among these ncrna, lncrna participate in a variety of biological and pathological processes, including tumorigenesis [6]. For example, lncrna CCAT2 expression significantly suppresses glioma cell growth, migration and invasion, and induces early apoptosis of glioma cells [7]. LncRNA also modulates epigenetic transcription regulation and modulates epigenetic posttranscription regulation [8]. The transcription and post-transcription regulation of tumors by lncrnas is increasing and requires further study. MicroRNAs (mirnas) are nucleotides in length [9] and participate in tumorigenesis, development, invasion and metastasis [10] and are important regulators in carcinogenesis and HCC [11]. While the exact function of mir-205 is still unclear, it plays a role in de-regulation of a number of cancers [12] and in particular, the genesis and development of HCC. The present study aims to investigate the role of abnormal LINC00152 expression in HCC progression and metastasis, and further explore the regulation of LINC00152 through negatively regulating mir-205.
2 Materials and methods Tissue collection and ethical statement This study was approved by Fifth Affiliated Hospital of Guangzhou Medical University. Besides, relevant ethical reviews had been approved Ethics Committee and Institutional Review Board of Guangzhou Medical University. Written consent was obtained from all enrolled patients and healthy controls. Fifty-three patients with HCC not receiving radiation therapy or chemotherapy at Fifth Affiliated Hospital of Guangzhou Medical University were recruited for the study between May 2014 and Oct All tissue samples, (including tissues and their paired adjacent normal tissues more than 5 cm away from the tumor border) were collected during surgery, and assessed by histopathological confirmation. After surgery, specimens were immediately frozen at -80 C for further use. HCC cells and culture Human HCC cell lines (HCCLM3, MHCC97L, HepG2, Hep3B and Huh7) and normal liver cell lines (THLE-3, L-02) were provided by the Chinese Academy of Sciences Cell Bank (Shanghai, China). All cells were cultured in Dulbecco s Modified Eagle s Medium (DMEM, Gibco, USA) containing 10% fetal bovine serum (FBS, Hyclone, USA) and 1% penicillin/streptomycin. The culture condition was kept at 5% CO 2 at 37 C. Real-time qpcr Total RNA was isolated from cells using TRIzol reagent (Invitrogen) according to the manufacturer s instructions. The isolated RNA (10 μg) was used to synthesize cdna using RevertAid firs Strand cdna Synthesis Kit (Fermentas, Germany). PCR was performed using quantitative SYBR Green PCR kit (TaKaRa, Dalian, China) according to the manufacturer s protocol. GAPDH was used as internal control. All primers were designed and synthesized by GenePharma (Shanghai, China) and shown as follows: LINC00673, forward, 5 -AATATTAAAC- GGTCCAGTCCTACAA-3 ; reverse; 5 -TAGGACTG- CCCATTACAGAGGA-3. mir-205, forward, 5 - GCTAT CTCCTAATGTAAG-3 ; reverse, 5 -GACGT- CTGAGGGGCGTT-3 ; GAPDH, forward, 5 -CGA- CTTATACATGGCCTTA-3, reverse, 5 -TTCCGAT- CACTGTTGGAAT-3. Relative levels of gene expression were expressed relative to GAPDH and calculated using the 2 -ΔΔCt method. RNA interference transfection All sirnas and negative controls were designed and purchased from Genepharm company (Shanghai, China). The sirna sequences were as follows: si-linc , 5 -CGGGAUGAA- CAUUAGACAGCA-3 ; si-linc , 5 -CCAU- UCAUCUUCAUUCUCCUA-3 ; si-mir-205, 5 -CU- CAUUCAUUCAAUCUUCUA-3. Interfering RNA plasmids (20 nm) were transfected into cells in 6-well plates using Lipofectamine TM 2000 reagent (Invitrogen, Carlsbad, CA, USA) according to the manufacturer s instructions. Cell proliferation assay The proliferation of HCC cells was measured using MTT assay. HCC cells (MHCC97L and HepG2) at logarithmical growing phase were seeded into 96-well culture plates at density of cells per well with DMEM medium (Hyclone). MTT (0.5 mg/ml) was added into each well on and incubated at 37 C. DMEM was then changed to 100 μl DMSO for incubation at room temperature. The absorbance was detected at 490 nm. Colony formation assay For the colony formation assay, HCC cells were seeded into 6-well plates at a density of cells per well. Cells were then cultured at 37 C with 5% CO 2 and cultured for 2 weeks. Finally, colonies were fixed with 4% paraformaldehyde and stained with 0.1% crystal violet (Beyotime, Shanghai, China) for 30 min. The number of colonies was counted on light microscopy and the experiment was performed in triplicate. Transwell invasion assay Invasion assay of HCC cells was performed with Transwell invasion assay according to the manufacturer s instructions (BD Biosciences, San Jose, CA, USA). Briefly, MHCC97L and Hepg2 cells at density of per well were respectively seeded into the upper chamber filled with medium containing 1% FBS. The lower chamber was filled with culture medium with 10% FBS medium. After 24 hours incubation, cells 2537 Am J Cancer Res 2017;7(12):
3 Figure 1. LINC00673 was up-regulated in HCC tissue and correlated with poor prognosis. A: LINC00673 expression levels were up-regulated in HCC tissue compared to adjacent normal tissue. B: Expression levels of LINC00673 in 53 pairs of HCC tissues and their adjacent non-tumorous tissues were measured by real-time PCR and counted in a training cohort. Value was normalized relative to GAPDH and calculated using log 2 method. C: LINC00673 expression was significantly higher in patients with advanced clinical stage (III-IV phase) than that with early clinical stage (I-II phase). D: Kaplan-Meier overall survival curves for 53 HCC patients with high and lower expression level of LINC Data are presented as the mean ± SD. **P<0.01 compared to control group. adhered on the upper surface of membrane were removed, while the cells migrated into the lower chamber were stained with 0.1% crystal violet. All experiments were performed in triplicate. Western blot analysis Total proteins were lysed by RIPA buffer (Sigma- Aldrich), containing protease inhibitors cocktail (Roche, USA). After centrifugation (12,000 g for 5 minutes), protein concentrations were detected with Bio-Rad Protein Assay Kit (Bio-Rad Laboratories, CA, USA). SDS-PAGE was conducted to separate equal amounts of cellular proteins, which were blotted onto PVDF membrane (Millipore, Billerica, MA, USA) and incubated overnight at 4 C with primary antibodies. Primary antibodies were purchased from Abcam Company shown as follows: anti-ecadherin (1:1000), anti-vimentin (1:1000), and anti-n-cadherin (1:1000). The membrane was incubated with second antibody (horseradish peroxidase-conjugated goat anti-rabbit) at 4 C was used as an internal ref- erence. All experiments were performed in triplicate and repeated three times. In vivo xenograft tumor growth A total of 10 male BALB/C nude mice (5 week, 5 mice in control group and 5 mice in si- LINC00673 group) were used for the xenograft tumor growth assay. MHCC97L cells ( ) were injected subcutaneously into the right flank of mice. After injection, the tumor volume was tested every five days according the formula: Volume = 0.5 length wide wide. After 25 days, mice were sacrificed and the tumor was weighed. The animal experiment was approved by the Committee on the Use of Live Animals in Teaching and Research of Fifth Affiliated Hospital of Guangzhou Medical University. Statistical analysis overnight. Finally, the blots were detected using an EZ- ECL chemiluminescence Detection kit for HRP (Biological Industries, Beit-Haemek, Israel). Luciferase reporter assay The 3 -UTR of LINC00673 containing mir-205 binding sites was amplified and cloned into the pgl3-basic luciferase vector (Promega, USA). HEK-293T cells were then seeded in 96-well plates for 24 h culture before transfection with the LINC wild-type or mutant reporter vector, mir-205 mimics or negative control and Renilla plasmid using Lipofectamine 2000 (Invitrogen, Carlsbad, Calif, USA). Luciferase activity was detected after transfection 24 h using Dual-Luciferase Reporter System (Promega, Madison, WI, USA). Renilla luciferase Statistical analysis was performed using SPSS (vision, 19.0; SPSS, Inc., Chicago, IL, USA) and 2538 Am J Cancer Res 2017;7(12):
4 Figure 2. LINC00673 silencing suppressed the proliferation and invasion of HCC cells in vitro. A: Expression of LINC00673 in human HCC cell lines (HCCLM3, MHCC97L, HepG2, Hep3B and Huh7) and normal liver cell lines (THLE-3, L-02) detected by RT-PCR. B: LINC00673 expression in HCC cells transfected with sirna or si-nc. C: Colony formation assay showed the clone number in MHCC97L and HepG2 cells. D, E: MTT assay showed the proliferation ability. F, G: Transwell assay showed the invasion of HCC cells. Data are presented as the mean ± SD. *P<0.05, **P<0.01 compared to control group. GraphPad (vision 6.0, USA). Values are represented as mean ± standard deviation (SD). Student s t-test or one-way ANOVA were used for comparisons between groups. Kaplan- Meier s method and the log-rank test were performed for survival rate. P<0.05 was identified as significant difference. Results LINC00673 was up-regulated in HCC tissue and correlated with poor prognosis In the early phase of experiments, 53 HCC tissue and adjacent normal tissues samples were collected and RT-PCR was performed to measure the expression level of LINC Results showed that LINC00673 expression levels were significantly up-regulated in HCC tissue compared to adjacent normal tissues (Figure 1A). The HCC tissues samples were divided into two groups according to the LINC00673 median expression; they were a high LINC00673 expression group and a low LINC00673 expression group (Figure 1B). Moreover, LINC00673 expression was significantly higher in patients with advanced clinical stage disease (III-IV phase) than those with early clinical stage disease (I-II phase) (Figure 1C). Kaplan-Meier curves of overall survivals and log-rank test showed that HCC patients 2539 Am J Cancer Res 2017;7(12):
5 Figure 3. Expression of EMT related markers proteins in HCC cells. A: Representative bands of E-cadherin, vimentin and N-cadherin in MHCC97L cells transfected with si-nc and si-rnas. B: Quantitate value of western blots in MHCC97L cells. C: Representative bands of E-cadherin, vimentin and N-cadherin in HepG2 cells. D: Quantitate value of western blots in HepG2 cells. Data are presented as the mean ± SD. *P<0.05, **P<0.01 compared to control group. Figure 4. LINC00673 was targeted by mir-205 at 3 -UTR. A: The predicted binding sites within mir-205 and 3 -UTR of LINC B: Luciferase reporter assay showed the decreasing fluorescence within mir-205 mimics and LINC00673 wild type. C: Expression of mir-205 in HCC tissue and adjacent normal tissue. D: Expression of mir-205 in HCC cells (MHCC97L, HepG2) transfected with si-linc Data are presented as the mean ± SD. *P<0.05, **P<0.01 compared to control group. with high LINC00673 levels had lower overall survival rates than those with low LINC00673 level (p=0.0128) (Figure 1D). Taken together, LINC00673 was up-regulated in HCC tissue and correlated with poor prognosis, suggesting the oncogenic role of LINC00673 in HCC genesis. LINC00673 silencing suppressed the proliferation and invasion of HCC cells in vitro Subsequent analysis, found LINC00673 expression level was significantly up-regulated in five HCC cell lines compared to two normal cell lines (Figure 2A). To determine the biological function of LINC00673, LINC00673 silencing via sirna transfection in HCC cells in MHCC97L and HepG2 cell lines in vitro was established (Figure 2B). Colony formation assay found LINC00673 silencing markedly decreased the clone number in MHCC97L and HepG2 cell lines compared to the negative control group (Figure 2C). MTT assay indicated LINC00673 silencing inhibited the proliferation of MHCC97L and HepG2 cells (Figure 2D, 2E). Transwell assay revealed LINC silencing inhibited the invasive ability of HCC cells (Figure 2F, 2G). Overall, results demonstrated the inhibitive function of LINC silencing on HCC cells in vitro, suggesting the underlying role of LINC00673 in HCC tumorigenesis. LINC00673 silencing regulated epithelial-mesenchymal transition (EMT) related markers expression E-cadherin, N-cadherin and vimentin are EMT maker proteins that reflect the metastasis of tumor tissue. To verify the role of LINC00673 silencing 2540 Am J Cancer Res 2017;7(12):
6 Figure 5. MiR-205 reversed the function of LINC00673 in MHCC97L cells. A: Expression of mir-205 in HCC cells detected by RT-PCR. B: Expression of mir-205 in in MHCC97L cells transfected with si-linc00673 and/or mir-205 inhibitor. C: Colony formation assay. D: MTT assay. E: Transwell assay showed the invasion of MHCC97L cells. Data are presented as the mean ± SD. *P<0.05, **P<0.01 compared to control group. on HCC metastasis, the expression of E-cadherin, N-cadherin and vimentin was measured using Western blot analysis. Results found LINC00673 silencing significantly increased E-cadherin expression in MHCC97L and HepG2 cells, while N-cadherin and vimentin expression was decreased (Figure 3A-D). Results showed that LINC00673 silencing decreased the metastasis of HCC cells. LINC00673 was targeted by mir-205 at 3 - UTR The potential targeting mirnas binding with LINC00673 were screened using bioinformatics analysis and mir-205 was found to closely target 3 -UTR of LINC The 3 -UTR binding sites were shown as follows (Figure 4A). Luciferase reporter assay confirmed the binding with the decreasing fluorescence within mir-205 mimics and LINC00673 wild type (Figure 4B). Expression of mir-205 in HCC tissue was decreased compared to adjacent normal tissue (Figure 4C). Moreover, after HCC cells (MHCC97L and HepG2) were transfected with si-linc00673, mir-205 expression levels were significantly up-regulated (Figure 4D). Overall, results suggest mir-205 targeted LI- NC00673 at 3 -UTR and was negatively correlated with LINC00673 expression. MiR-205 reversed the function of LINC00673 in MHCC97L cells It had been found that mir-205 targeted LINC UTR and was negatively correlated with LINC00673 expression. Expression of mir-205 was significantly down-regulated in HCC cells (Figure 5A). In these cell lines, MHCC97L cells were used to perform rescue experiments to verify the role of mir-205 compared to LINC Results found mir-205 inhibitor decreased the expression of mir-205 induced by si-linc00673 (Figure 5B). Colony formation assay and MTT assay revealed mir- 205 inhibitor suppressed the proliferation of MHCC97L induced by si-linc00673 (Figure 5C, 5D). Similarly, transwell assay showed mir-205 inhibitor suppressed the invasion of MHCC97L cells induced by si-linc00673 (Fi Am J Cancer Res 2017;7(12):
7 gure 5E). Generally, results showed mir-205 could reverse the function of LINC00673 on HCC cells, suggesting the antergic interaction within mir-205 and LINC LINC00673 silencing could inhibit tumor growth in vivo To investigate the role of LINC00673 on HCC tumor growth, we performed a xenograft model experiment in vivo. Results found LINC00673 silencing (si-linc00673) markedly decreased the tumor volumes and weights compared to the control group (si-nc) (Figure 6A, 6B). Results revealed LINC00673 silencing suppressed tumor growth in vivo, suggesting the tumor promoting role of LINC00673 on HCC. Discussion Hepatocellular carcinoma (HCC) is a serious malignant tumor characterized by metastasis and postsurgical recurrence, and thereby poor prognosis and low survival rates [13, 14]. Long non-coding RNAs (lncrnas) have been found to participate in the tumorigenesis of HCC [15]. The present study found that LINC00673 was up-regulated in HCC tissue and cells, and modulated the HCC carcinogenesis via harboring mir-205. Figure 6. LINC00673 silencing could inhibit tumor growth in vivo. A: Tumor volumes and size of subcutaneous implantation mice models of MHCC97L cells transfected with si-linc B: Tumors resected from mice models. Upper row is control group. Lower row is si-linc00673 group. C: Tumor weight of control group and si-linc00673 group. Data are presented as the mean ± SD. *P<0.05, **P<0.01 compared to control group. ing the progression and recurrence of tumor tissue [16]. The present study found greater expression of LINC predicted a poorer prognosis for HCC patients. Lossof-function experiments reveal that LINC00673 silencing inhibited HCC cell (MH- CC97L and HepG2) proliferation and invasion in vitro. Furthermore, LINC00673 silencing increased E-cadherin expression, and decreased vimentin and N-cadherin expression, suggesting the EMT inhibiting role of LINC00673 knockdown on HCC cells. The results suggest pathological overexpression of LINC increases the progression The proliferation, invasion and metastasis of tumour cells are the key characteristics affect- and metastasis of HCC tissue, and LINC00673 knockdown suppresses tumorous development. LncRNA has been identified as an important regulator in the epigenetic mechanism involved in histone modification, DNA methylation, transcriptional regulation and post-transcriptional regulation [17, 18]. Given the extensive distribution and multidimensional function of lncrnas additional research is required on this topic [19]. LncRNA acts as regulator in the tumorigenesis and progression of HCC [20]. For example, lncrna MALAT1 is up-regulated in HCC tissue and cells, and the overexpression of MALAT1 promotes cell invasion and migration and is correlated with the expression of hepatitis B virus X protein [21]. LncRNAs also modulate DNA methylation and affect gene expression and phenotypes. For example, lncrna PCAT-14 is overexpressed in HCC tissue and is found to regulate expression of ATAD2 and activation of the Hedgehog pathway by inducing methylation of the mir-372 promoter [22]. The regulation mechanism of lncrna functions to adsorb target mirnas to indirectly modulate the functional gene expression, this is also known as competing endogenous RNA (cerna) or mirna sponge [23]. Using a bioinformatics prediction program, the present study described the potential downstream mir-205 targeting with LINC UTR. Rescue experiments suggested the effective binding within 2542 Am J Cancer Res 2017;7(12):
8 mir-205 and LINC00673, validating the regulating approach of LINC00673 harboring mir Given these results, it is suggested that LINC00673 plays a regulatory role in HCC tumorigenesis. It has been reported that mir- 205 is significantly down-regulated in HCC tissue, which modulates HCC genesis via targeting PLCβ1 gene [24]. The mechanism of cerna is involved in tumorous genesis, development, progression and metastasis [25]. In glioma cancer tissue, lncrna PVT1 negatively regulates mir-424 expression to act as an oncogenic lncrna in tumorigenesis [26]. In HCC, lncrna HULC depletion inhibited the growth and metastasis of HCC cell lines in vitro and in vivo, suggesting HULC regulates ZEB1-induced EMT via HULC/ mir-200a-3p/zeb1 signaling pathway [27]. The present study demonstrates the role of lncrna LINC00673 in HCC progression and metastasis via harboring mir-205, providing an novel insight for pathogenesis and highlighting a therapeutic target for HCC. Acknowledgements This work was supported by Basic Medical Research Center of Guangzhou Medical University. Authors want to thank Dr. Wu Ph.D for her manuscript correcting. Disclosure of conflict of interest None. Address correspondence to: Li-Guo Zhang, Department of General Surgery, Fifth Affiliated Hospital of Guangzhou Medical University, No. 621, Harbor Road, Huangpu District, Guangzhou , China. zhangliguo2008@126.com References [1] Gounder PP, Bulkow LR, Meltzer MI, Bruce MG, Hennessy TW, Snowball M, Spradling PR, Adhikari BB and McMahon BJ. Cost-effectiveness analysis of hepatocellular carcinoma screening by combinations of ultrasound and alphafetoprotein among Alaska native people, Int J Circumpolar Health 2016; 75: [2] Hong SK, Lee KW, Kim HS, Yoon KC, Yi NJ and Suh KS. Living donor liver transplantation for hepatocellular carcinoma in Seoul national university. Hepatobiliary Surg Nutr 2016; 5: [3] Si T, Chen Y, Ma D, Gong X, Guan R, Shen B and Peng C. Transarterial chemoembolization prior to liver transplantation for patients with hepatocellular carcinoma: a meta-analysis. J Gastroenterol Hepatol 2017; 32: [4] Zhao YN, Zhang YQ, Ye JZ, Liu X, Yang HZ, Cong FY, Xiang BD, Wu FX, Ma L, Li LQ and Ye HH. Hepatic resection versus transarterial chemoembolization for patients with Barcelona clinic liver cancer intermediate stage child-pugh a hepatocellular carcinoma. Exp Ther Med 2016; 12: [5] He X, Sun F, Guo F, Wang K, Gao Y, Feng Y, Song B, Li W and Li Y. Knockdown of long noncoding RNA FTX inhibits proliferation, migration, and invasion in renal cell carcinoma cells. Oncol Res 2017; 25: [6] Li JH, Zhang SQ, Qiu XG, Zhang SJ, Zheng SH and Zhang DH. Long non-coding RNA NEAT1 promotes malignant progression of thyroid carcinoma by regulating mirna-214. Int J Oncol 2017; 50: [7] Zeng J, Du T, Song Y, Gao Y, Li F, Wu R, Chen Y, Li W, Zhou H, Yang Y and Pei Z. Knockdown of long noncoding RNA CCAT2 inhibits cellular proliferation, invasion, and EMT in glioma cells. Oncol Res 2016; 56: [8] Durzynska J, Lesniewicz K and Poreba E. Human papillomaviruses in epigenetic regulations. Mutat Res 2017; 772: [9] Huang L, Li F, Deng P and Hu C. MicroRNA-223 promotes tumor progression in lung cancer A549 cells via activation of the NF-kappaB signaling pathway. Oncol Res 2016; 24: [10] Pan C, Wang D, Zhang Y and Yu W. MicroR- NA-1284 inhibits cell viability and induces apoptosis of ovarian cancer cell line OVCAR3. Oncol Res 2016; 24: [11] Yin D, Wang Y, Sai W, Zhang L, Miao Y, Cao L, Zhai X, Feng X and Yang L. HBx-induced mir- 21 suppresses cell apoptosis in hepatocellular carcinoma by targeting interleukin-12. Oncol Rep 2016; 36: [12] Cui M, Xiao Z, Sun B, Wang Y, Zheng M, Ye L and Zhang X. Involvement of cholesterol in hepatitis B virus X protein-induced abnormal lipid metabolism of hepatoma cells via up-regulating mir-205-targeted ACSL4. Biochem Biophys Res Commun 2014; 445: [13] Huang C, Zhuang W, Feng H, Guo H, Tang Y, Chen H and Huang Y. Analysis of therapeutic effectiveness and prognostic factor on argonhelium cryoablation combined with transcatheter arterial chemoembolization for the treatment of advanced hepatocellular carcinoma. J Cancer Res Ther 2016; 12: C148-c152. [14] Wakayama K, Kamiyama T, Yokoo H, Orimo T, Shimada S, Einama T, Kamachi H and Taketomi A. Huge hepatocellular carcinoma greater 2543 Am J Cancer Res 2017;7(12):
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