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Li Q, Qiu B, Xie W, Hui Z, Wang B, Liang Y, Guo J, Zhou Y, Zhu M, Shen W, Duan R, Chen L, Zhang L, Long H, Liu H. P2.14-004 Comparable Local Controls after Twice-Daily and Once-Daily Chest Radiotherapy in Extensive Stage Small Cell Lung Cancer. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.1376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Ma L, Ye W, Li Q, Wang B, Luo G, Chen Z, Guo S, Qiu B, Liu H. P1.14-010 SGA Could Be a Predictive Factor for Radiation Pneumonitis in Lung Cancer Patients Treated by Concurrent Chemoradiotherapy. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.1028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Qiu B, Liu H. P1.14-012 Hypofractionated Simultaneous Integrated Boost IMRT Concurrent with Chemotherapy Improved Loco-Regional Control in Locally Advanced NSCLC. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.1030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Qiu B, Ma L, Zhang J, Li Q, Wang B, Zhang X, Qiang M, Chen Z, Guo S, Liu H. Survival and Prognostic Factors of Radical Radiotherapy for Locally Recurrent Non-Small Cell Lung Cancer after Surgery. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.1740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Qiu B, Liang Y, Li Q, Liu G, Wang F, Chen Z, LIU M, Zhao M, Liu H. Local Therapy for Oligoprogressive Disease in Advanced Staged Non–small Cell Lung Cancer Patients Harboring Epidermal Growth Factor Receptor Mutation. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.1739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Qiu B, Ma L, Ye W, Li Q, Wang B, Luo G, Chen Z, Guo S, Liu H. Subjective Global Assessment (SGA) Scores Could be a Predictive Factor for Radiation Pneumonitis in Locally Advanced Lung Cancer Patients Treated By Intensity-Modulated Radiation Therapy and Concurrent Chemotherapy. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.1738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Mu H, Qiu B, Xie Q, Han W, Zhao T, Zhao S. 324 CapG is Highly Expressed in Prostate Cancer and Affects Cell Apoptosis, Proliferation and Migration. J Sex Med 2017. [DOI: 10.1016/j.jsxm.2016.11.215] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Li Q, Zhu Y, Zhang W, Yang H, Qiu B, Liang Y, HU Y, Liu M, Liu H. Concurrent Chemoradiation Therapy for Esophageal Cancer and Synchronous Second Primary Malignancy in the Upper Digestive Tract. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Qiu B, Wang D, Yang H, Xie W, Liang Y, Cai P, Liu M, Fu J, Xie C, Liu H. Combined Modalities of Magnetic Resonance Imaging, Endoscopy, and Computed Tomography in Evaluation of Tumor Response to Definitive Chemoradiation Therapy in Esophageal Squamous Cell Carcinoma. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.1018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Liu S, Anfossi S, Zheng Y, Cai M, Fu J, Qiu B, Yang H, Liu Q, Fu J, Liu M, Burks J, Lin S, Reuben J, Liu H. Clinical and Biological Prognostic Factors for Locoregional Recurrence in Patients With Thoracic Esophageal Squamous Cell Carcinoma Treated With Radical 2-field Lymph Node Dissection: Results From Long-term Follow-up. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.1030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Liu S, Qiu B, Yang H, Luo G, Liang Y, Zheng Y, Chen Z, Luo K, Xi M, Liu Q, HU Y, Li Q, Fu J, Liu M, Liu H. Staging Matched-Pair Comparison of Surgery After Neoadjuvant Chemoradiation Therapy, Surgery Alone, and Definitive Chemoradiation Therapy for Thoracic Esophageal Squamous Cell Carcinoma: Treatment Decision Making in the Real World. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.1065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Wang Y, Qiu B, Liu J, Zhu WG, Zhu S. Cocaine- and amphetamine-regulated transcript facilitates the neurite outgrowth in cortical neurons after oxygen and glucose deprivation through PTN-dependent pathway. Neuroscience 2014; 277:103-10. [DOI: 10.1016/j.neuroscience.2014.06.064] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Revised: 06/12/2014] [Accepted: 06/28/2014] [Indexed: 01/11/2023]
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Qiu B, Zou HY, Yang YH, Lai CF. Interleukin-1B-31 gene polymorphism in Hakka gastric cancer patients in Guangdong, China. GENETICS AND MOLECULAR RESEARCH 2014; 13:5873-9. [DOI: 10.4238/2014.august.7.2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Zhang B, Xu X, Qi Z, Peng L, Qiu B, Huo X. The FUS1 gene inhibits EC109 cell growth mediated by a lentivirus vector. Br J Biomed Sci 2013; 70:22-6. [PMID: 23617094 DOI: 10.1080/09674845.2013.11669925] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
The effects of the FUS1 gene on the oesophageal carcinoma cell line EC109 are investigated. The messenger RNA (mRNA) expression level of the FUS1 gene was detected by a reverse transcription polymerase chain reaction (RT-PCR) technique in the cell lines SHEE, SHEEC and EC109. The full length of the FUS1 gene was amplified using a PCR technique from the total RNA of umbilical mesenchymal stem cells. The FUS1 gene was cloned into a pSL6-IRES-EGFP vector and identified by PCR, digestion and sequencing. The recombinant pSL6-FUS1-IRES-EGFP plasmid was transfected into 293FT cells and the resulting lentivirus was collected. The growth of EC109 cells after transfection with lentivirus containing the FUS1 gene was determined by MTT assay and plate colony formation. Expression of the FUS1 gene in EC109 cells was weaker than that in SHEE, SHEEC cells and human umbilical vein endothelial cells (HUVEE; used as a control). Transfection efficiency was more than 80% after 48 h. Cell growth assessed by MTT assay was inhibited by about 40% compared with the control group; a finding that was in accordance with the plate colony formation results. The results suggest that the FUS1 gene might be a candidate tumour suppressor gene for the treatment of oesophageal carcinoma; however, these results require confirmation in in vivo studies.
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Zhu B, Li Y, Li M, Yang X, Qiu B, Gao Q, Liu J, Liu M. Dynamic proteome analysis of spinal cord injury after ischemia-reperfusion in rabbits by two-dimensional difference gel electrophoresis. Spinal Cord 2013; 51:610-5. [PMID: 23752265 DOI: 10.1038/sc.2013.24] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2012] [Revised: 02/28/2013] [Accepted: 03/07/2013] [Indexed: 01/22/2023]
Abstract
STUDY DESIGN Spinal cord injury (SCI) is a devastating and common neurologic disorder that has profound influences on modern society from physical, psychosocial and socio-economic perspectives. OBJECTIVES To analyze the dynamic changes in protein expression during SCI after ischemia-reperfusion. METHODS We used two-dimensional difference gel electrophoresis combined with matrix-assisted laser desorption/ionization time-of-flight/time-of-flight MS to give a global analysis of protein dynamic change during SCI after ischemia-reperfusion. Dynamic changes in protein expression were investigated from 6 to 48 h in SCI after ischemia-reperfusion using a proteomics tool. RESULTS Twenty-one proteins were identified in total, including neuronal proteins, glycometabolism enzymes, stress-related proteins and cytoskeleton-related proteins. These were divided into upregulated and downregulated groups. Results identified 24 h as a key time point when all proteins were changed dramatically. In addition, changes in Fascin expression were discovered in SCI for the first time. CONCLUSION In conclusion, we observed dynamic proteome change correlated with SCI by ischemia-reperfusion, and provided a clue to this pathological mechanism by protein identification and analysis.
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Zhu Y, Qiu B, Liu H, Li Q, Xiao W, Hu Y, Liu M. Primary small cell carcinoma of the esophagus: review of 64 cases from a single institution. Dis Esophagus 2013; 27:152-8. [PMID: 23639106 DOI: 10.1111/dote.12069] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Primary small cell carcinoma of esophagus (SCCE) is a rare disease with poor prognosis. The aims of this study are to review the clinical characteristics, treatment modalities, and outcomes of SCCE and to investigate the prognostic factors and optimal treatment options. Sixty-four patients diagnosed as SCCE in Sun Yat-sen University Cancer Center from 1990 to 2011 were retrospectively reviewed. There were 46 patients with limited disease (LD) and 18 with extensive disease. The median survival time (MST) and overall survival rate were calculated and compared by the Kaplan-Meier method and log-rank test, respectively. The prognostic factors were calculated by Cox hazards regression model. With a median follow up of 11.6 months, the MST of all the 64 patients was 12.6 months, 16.5 months for LD and 9.0 months for extensive disease. The 1-, 3-, and 5-year overall survivals were 52.5%, 20.9%, and 7.5%, respectively. In univariate analysis, patients with ECOG performance score <2 (P = 0.009), lesion length ≤5 cm (P = 0.009), T stage ≤2 (P = 0.004), LD (P = 0.000), and multimodality treatment (P = 0.016) had significant associations with MST. Multivariate analysis showed that ECOG performance score (P = 0.001), T stage (P = 0.023), limited-extensive stage (P = 0.007), and treatment modality (P = 0.008) were independent prognostic factors. Locoregional treatment combined with chemotherapy had a trend to increase MST from 15.3 to 20.0 months in LD patients (P = 0.126), while combined chemotherapy had a significant impact on MST in extensive disease patients (P = 0.000). SCCE is a highly malignant disease with poor prognosis. Patients might obtain survival benefit from the combination of locoregional treatment and systemic therapy. Prospective studies are needed to validate these factors.
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Qiu B, Lin YB, Cai QQ, Hu YM, Wang DF, Lin ZD, Liang Y. Primary lymphoepithelioma-like carcinoma of ocular adnexa: clinicopathologic features and treatment. ACTA ACUST UNITED AC 2013; 20:e113-22. [PMID: 23559878 DOI: 10.3747/co.20.1289] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND AND METHODS Lymphoepithelioma-like carcinoma (lelc) is a rare malignancy in ocular adnexa. Here, we report 4 patients with lelc and review 11 patients reported in the literature. Clinical profiles, association with Epstein-Barr virus (ebv), treatment, and outcomes are analyzed. RESULTS Lacrimal glands and the lacrimal drainage system, eyelid, and conjunctiva are potential primary sites for lelc. The tumours are characterized histologically by nests of undifferentiated malignant cells surrounded by lymphoid infiltrates. Infection with ebv was confirmed in lelc of ocular adnexa, and that association seemed to be restricted to Asian populations. Results from our centre uniformly showed expression of ebv-encoded small rnas in primary tumour, locally recurrent tumour, and metastatic lymph nodes. This disease had a tendency to relapse regionally. Postoperative radiotherapy seems to improve disease-free survival. Tumours appear to be sensitive to radiotherapy and chemotherapy based on cisplatin and 5-fluorouracil. At our centre, 3 patients were still living at 22, 33, and 76 months after surgery. One patient died of distant metastasis after a survival of 38 months. CONCLUSIONS Lymphoepithelioma-like carcinoma is a heterogenous entity among ocular adnexal malignancies. Multimodality treatment provides a better chance at survival. Further investigation is required to achieve a better understanding of the biologic behavior of this entity and of its optimal treatment.
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Meng Y, Wang J, Sun J, Zhang F, Wang H, Zhang T, Qiu B, Yang X. Abstract No. 140: MRI of intracoronary local agent delivery using motexafin gadolinium: towards molecular MRI-guided gene therapy. J Vasc Interv Radiol 2012. [DOI: 10.1016/j.jvir.2011.12.183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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Wang W, Qiu B, Li Q, Chen H, Xu W. CT onset of influenza A (H1N1) complicated with severe pneumonia in two typical cases. Panminerva Med 2010; 52:355-9. [PMID: 21183896 DOI: pmid/21183896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The novel influenza A (H1N1) virus developed in the United States and Mexico in April 2009 and has spread worldwide rapidly. Pulmonary complications are major reason of death associated with influenza A (H1N1) infection. Thus, it is necessary to investigate characteristics on the turnover of A (H1N1) infection complicated with pneumonia. Although the chest radiographic findings of the influenza A (H1N1) pneumonia were described in a clinical report, the CT findings involving turnover of influenza A (H1N1) complicated with severe pneumonia have not yet been reported. We report two typical cases of novel influenza A (H1N1) pneumonia with chest CT findings and investigate features and turnover of influenza A(H1N1) pneumonia. From the CT appearance of two cases, we found that influenza A(H1N1) complicated with pneumonia might progress rapidly, but it would recover in two or three weeks once it was controlled effectively. The CT images in our report might help the clinician to clearly understand the patterns of onset, progression and outcomes in influenza A(H1N1) complicated with pneumonia.
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MESH Headings
- Adrenal Cortex Hormones/therapeutic use
- Antiviral Agents/therapeutic use
- Disease Progression
- Drug Therapy, Combination
- Fatal Outcome
- Female
- Humans
- Influenza A Virus, H1N1 Subtype/pathogenicity
- Influenza, Human/diagnostic imaging
- Influenza, Human/therapy
- Influenza, Human/virology
- Middle Aged
- Pneumonia, Viral/diagnostic imaging
- Pneumonia, Viral/therapy
- Pneumonia, Viral/virology
- Respiration, Artificial
- Severity of Illness Index
- Time Factors
- Tomography, X-Ray Computed
- Treatment Outcome
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Qiu B, Karmarkar P, Atalar E, Yang X. Abstract No. 50: Development of a 0.014-Inch Magnetic Resonance Imaging-Guidewire for MR-Guided Coronary Interventions. J Vasc Interv Radiol 2009. [DOI: 10.1016/j.jvir.2008.12.055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Li BZ, Lei W, Zhang CY, Zhou F, Li N, Shi SS, Feng XL, Chen ZL, Hang J, Qiu B, Wan JT, Shao K, Xing XZ, Tan XG, Wang Z, Xiong MH, He J. Increased expression of paxillin is found in human oesophageal squamous cell carcinoma: a tissue microarray study. J Int Med Res 2008; 36:273-8. [PMID: 18380937 DOI: 10.1177/147323000803600209] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Oesophageal cancer is one of the most common cancers worldwide. Currently, the tumour, node, metastasis (TNM) staging system is the primary method for determining its extent and prognosis, however, data suggest this system does not predict prognosis accurately. Research has, therefore, concentrated on searching for specific biomarkers. Paxillin has been shown to play an important role in controlling cell spread and migration. Its over-expression is considered to correlate with the prognosis of some types of cancers, however, the relationship between paxillin expression and clinical outcome in oesophageal cancer has not been investigated. This study determined the expression of paxillin by immunohistochemistry on the tissue microarray of 100 oesophageal squamous cell cancer patients followed up for a mean of 55 months. Paxillin was over-expressed in tumours in 27/100 cases, compared with 6/100 cases for adjacent non-tumoural cells. No correlation occurred between expression of paxillin and overall patient survival, hence paxillin is not an effective prognostic marker in these patients.
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Kar S, Kumar A, Gao F, Qiu B, Zhan X, Yang X. Percutaneous optical imaging system to track reporter gene expression from vasculatures in vivo. JOURNAL OF BIOMEDICAL OPTICS 2006; 11:34008. [PMID: 16822058 PMCID: PMC1501088 DOI: 10.1117/1.2209559] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
This study develops a percutaneous optical imaging system for tracking fluorescent reporter gene expression in vasculatures. We build a percutaneous optical imaging system that primarily comprised a 1.5-mm, semi-rigid, two-port optical probe. The performance of the optical probe is first tested in vitro with cell phantoms, and then the feasibility of the percutaneous optical imaging system is validated in vivo in eight femoral artery segments of two pigs. The green fluorescent protein (GFP) gene is locally delivered into four arterial segments, while saline is delivered to the four contralateral arterial segments as controls. The targeted arteries are localized using color Doppler, and thereafter the optical probe is positioned to the target arterial segments under ultrasound guidance. Optical imaging captures are obtained using different exposure times from 10 to 60 s. Subsequently, the GFP- and saline-targeted arteries are harvested for fluorescent microscopy confirmation. The percutaneous optical probe is successfully positioned at a distance approximately 2 mm from the targets in all eight arteries. The in-vivo imaging shows higher average signal intensity in GFP-treated arteries than in saline-treated arteries. This study demonstrates the potential using the percutaneous optical imaging system to monitor, in vivo, reporter gene expression from vasculatures.
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Zhang B, Huo X, Xu X, Qi Z, Yang H, Peng L, Qiu B, Zheng L. Extraction of DNA from paraffin sections with proteinase K and DNAzol. Br J Biomed Sci 2006; 63:88-9. [PMID: 16872003 DOI: 10.1080/09674845.2006.11978089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Dharap SS, Wang Y, Chandna P, Khandare JJ, Qiu B, Gunaseelan S, Sinko PJ, Stein S, Farmanfarmaian A, Minko T. Tumor-specific targeting of an anticancer drug delivery system by LHRH peptide. Proc Natl Acad Sci U S A 2005; 102:12962-7. [PMID: 16123131 PMCID: PMC1200279 DOI: 10.1073/pnas.0504274102] [Citation(s) in RCA: 240] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2005] [Indexed: 11/18/2022] Open
Abstract
The central problem in cancer chemotherapy is the severe toxic side effects of anticancer drugs on healthy tissues. Invariably the side effects impose dose reduction, treatment delay, or discontinuance of therapy. To limit the adverse side effects of cancer chemotherapy on healthy organs, we proposed a drug delivery system (DDS) with specific targeting ligands for cancer cells. The proposed DDS minimizes the uptake of the drug by normal cells and enhances the influx and retention of the drug in cancer cells. This delivery system includes three main components: (i) an apoptosis-inducing agent (anticancer drug), (ii) a targeting moiety-penetration enhancer, and (iii) a carrier. We describe one of the variants of such a system, which utilizes camptothecin as an apoptosis-inducing agent and poly(ethylene glycol) as a carrier. Luteinizing hormone-releasing hormone (LHRH) was used as a targeting moiety (ligand) to LHRH receptors that are overexpressed in the plasma membrane of several types of cancer cells and are not expressed detectably in normal visceral organs. The results showed that the use of LHRH peptide as a targeting moiety in the anticancer DDS substantially enhanced the efficacy of chemotherapy, led to amplified apoptosis induction in the tumor, and minimized the side effects of the anticancer drug on healthy organs. The LHRH receptor targeting DDS did not show in vivo pituitary toxicity and did not significantly influence the time course or the plasma concentration of luteinizing hormone and its physiological effects on the reproductive functions of mice.
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Dharap SS, Qiu B, Williams GC, Sinko P, Stein S, Minko T. Molecular targeting of drug delivery systems to ovarian cancer by BH3 and LHRH peptides. J Control Release 2003; 91:61-73. [PMID: 12932638 DOI: 10.1016/s0168-3659(03)00209-8] [Citation(s) in RCA: 140] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Novel targeted proapoptotic anticancer drug delivery systems were developed and evaluated. Poly(ethyleneglycol) (PEG) conjugates were used as carriers. Camptothecin (CPT) was used as an anticancer agent-apoptosis inductor. Two types of molecular targets were investigated: (1) an extracellular membrane receptor specific to ovarian cancer and (2) intracellular controlling mechanisms of apoptosis. Synthetic peptides similar to luteinizing hormone-releasing hormone (LHRH) and BCL-2 homology 3 (BH3) peptide were used as a targeting moiety and a suppressor of cellular antiapoptotic defense, respectively. Three different conjugates (CPT-PEG, CPT-PEG-BH3 and CPT-PEG-LHRH) were synthesized and examined in A2780 human ovarian cancer cells. Cytotoxicity, expression of genes encoding BCL-2, BCL-XL, SMAC, APAF-1 proteins and caspases 3 and 9, the activity of caspases 3 and 9 and apoptosis induction were studied. Taken together the results indicate much higher cytotoxicity and apoptosis-inducing activity of PEG-CPT conjugates when compared to free CPT. Moreover, the effects of targeted CPT-PEG-BH3 and CPT-PEG-LHRH conjugates were more pronounced than the non-targeted PEG-CPT conjugate. The results confirmed the feasibility of this new two-tier molecular targeting strategy for enhancing the efficacy of cancer chemotherapy.
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