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Janku F, Johnson LK, Karp DD, Atkins JT, Singleton PA, Moss J. Treatment with methylnaltrexone is associated with increased survival in patients with advanced cancer. Ann Oncol 2018; 29:1076. [PMID: 29253076 DOI: 10.1093/annonc/mdx776] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Janku F, Johnson LK, Karp DD, Atkins JT, Singleton PA, Moss J. Treatment with methylnaltrexone is associated with increased survival in patients with advanced cancer. Ann Oncol 2016; 27:2032-2038. [PMID: 27573565 DOI: 10.1093/annonc/mdw317] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 07/28/2016] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Methylnaltrexone (MNTX), a peripherally acting μ-opioid receptor (MOR) antagonist, is FDA-approved for treatment of opioid-induced constipation (OIC). Preclinical data suggest that MOR activation can play a role in cancer progression and can be a target for anticancer therapy. PATIENTS AND METHODS Pooled data from advanced end-stage cancer patients with OIC, despite laxatives, treated in two randomized (phase III and IV), placebo-controlled trials with MNTX were analyzed for overall survival (OS) in an unplanned post hoc analysis. MNTX or placebo was given subcutaneously during the double-blinded phase, which was followed by the open-label phase, allowing MNTX treatment irrespective of initial randomization. RESULTS In two randomized, controlled trials, 229 cancer patients were randomized to MNTX (117, 51%) or placebo (112, 49%). Distribution of patients' characteristics and major tumor types did not significantly differ between arms. Treatment with MNTX compared with placebo [76 days, 95% confidence interval (CI) 43-109 versus 56 days, 95% CI 43-69; P = 0.033] and response (laxation) to treatment compared with no response (118 days, 95% CI 59-177 versus 55 days, 95% CI 40-70; P < 0.001) had a longer median OS, despite 56 (50%) of 112 patients ultimately crossing over from placebo to MNTX. Multivariable analysis demonstrated that response to therapy [hazard ratio (HR) 0.47, 95% CI 0.29-0.76; P = 0.002) and albumin ≥3.5 (HR 0.46, 95% CI 0.30-0.69; P < 0.001) were independent prognostic factors for increased OS. Of interest, there was no difference in OS between MNTX and placebo in 134 patients with advanced illness other than cancer treated in these randomized studies (P = 0.88). CONCLUSION This unplanned post hoc analysis of two randomized trials demonstrates that treatment with MNTX and, even more so, response to MNTX are associated with increased OS, which supports the preclinical hypothesis that MOR can play a role in cancer progression. Targeting MOR with MNTX warrants further investigation in cancer therapy. CLINICAL TRIALS NUMBER NCT00401362, NCT00672477.
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Affiliation(s)
- F Janku
- Department of Investigational Cancer Therapeutics (Phase I Clinical Trials Program), The University of Texas MD Anderson Cancer Center, Houston
| | | | - D D Karp
- Department of Investigational Cancer Therapeutics (Phase I Clinical Trials Program), The University of Texas MD Anderson Cancer Center, Houston
| | - J T Atkins
- Department of Investigational Cancer Therapeutics (Phase I Clinical Trials Program), The University of Texas MD Anderson Cancer Center, Houston
| | - P A Singleton
- Department of Medicine, Section of Pulmonary and Critical Care.,Department of Anesthesia and Critical Care, Pritzker School of Medicine, The University of Chicago, Chicago, USA
| | - J Moss
- Department of Anesthesia and Critical Care, Pritzker School of Medicine, The University of Chicago, Chicago, USA
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Singleton PA, Mirzapoiazova T, Hasina R, Salgia R, Moss J. Increased μ-opioid receptor expression in metastatic lung cancer. Br J Anaesth 2014; 113 Suppl 1:i103-8. [PMID: 24920011 DOI: 10.1093/bja/aeu165] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND We and others have previously demonstrated that the μ-opioid receptor (MOR) is overexpressed in several human malignancies. There is a seven-fold increase in MOR in cell lines of human lung cancer. In animal models, overexpression of MOR promotes tumour growth and metastasis. We, therefore, examined whether MOR expression is increased in metastatic lung cancer. METHODS In this study, we examined the association between MOR expression and metastasis in archived biopsy samples from patients with lung cancer. Paraffin-embedded patient material was stained using MOR antibody and scored qualitatively by two independent pathologists using a four-point scale. RESULTS In human lung cancer and normal adjacent lung samples obtained from 34 lung cancer patients, MOR expression was increased significantly in cancer samples from patients with lung cancer compared with adjacent control tissue (P=0.0242). When the samples from patients with metastatic lung cancer were separated from the cohort of the total number of patients with lung cancer, we observed an approximately two-fold increase in MOR expression (P=0.0013). CONCLUSIONS The association between the expression of MOR and the progression of the tumour is consistent with the hypothesis of a direct effect of MOR on cancer progression.
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Affiliation(s)
- P A Singleton
- Department of Medicine, Section of Pulmonary and Critical Care, Department of Anesthesia and Critical Care and
| | - T Mirzapoiazova
- Department of Medicine, Section of Pulmonary and Critical Care
| | - R Hasina
- Section of Hematology/Oncology, Pritzker School of Medicine, The University of Chicago, Chicago, IL 60637, USA
| | - R Salgia
- Section of Hematology/Oncology, Pritzker School of Medicine, The University of Chicago, Chicago, IL 60637, USA
| | - J Moss
- Department of Anesthesia and Critical Care and
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Mathew B, Lennon FE, Siegler J, Gerhold L, Mambetsariev N, Moreno-Vinasco L, Garcia JG, Salgia R, Moss J, Singleton PA. Effect of methylnaltrexone inhibition of the mu opioid receptor on Lewis lung carcinoma proliferation, invasion, and angiogenesis. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e13597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Abstract
e14636 Background: Angiogenesis is important in cancer growth and metastasis. Recent therapeutic interventions cancer, include drugs such as temsirolimus that target both tumor growth and angiogenesis including the mammalian target of rapamycin (mTOR) inhibitor. Previously, we have demonstrated that the peripheral opioid antagonist methylnaltrexone (MNTX) potentiates the effects of bevacizumab and 5FU on endothelial cell (EC) migration and proliferation. Since mTOR inhibitor therapy is also associated with significant side effects, we examined potential adjunctive agents that could reduce the therapeutic dose and improve the therapeutic window for this approach. Methods: We determined the effect(s) of MNTX, naloxone and/or temsirolimus on VEGF-induced human pulmonary microvascular EC proliferation and migration assays. We used siRNA and specific inhibitors to analyze Src, Akt and mTOR regulation. Results: MNTX inhibited EC VEGF-induced proliferation and migration with an IC50 of ∼100 nM. Adding 10 nM MNTX to EC shifted the IC50 of temsirolimus inhibition of VEGF-induced proliferation from ∼10 nM to ∼1 nM. Further, adding 10 nM MNTX shifted the IC50 of temsirolimus on inhibition of EC migration from ∼50 nM to ∼10 nM. These synergistic effects were not observed with naltrexone, a tertiary mu opioid receptor antagonist. On a mechanistic level, we observed that treatment of human EC with MNTX, but not naltrexone, increased protein tyrosine phosphatase (PTP) activity which was independent of mu opioid receptor expression. Treatment of human EC with the PTP inhibitor, 3,4-Dephostatin, inhibited both the synergy between MNTX and temsirolimus and increased VEGF-induced tyrosine phosphorylation of Src with enhanced PI3 kinase and mTOR complex 2-dependent phosphorylation of Akt and subsequent activation of mTOR complex 1 (temsirolimus target), while silencing Src, Akt or mTOR complex 2 components blocked VEGF-induced angiogenic events. Conclusions: Synergy of MNTX with mTOR inhibitors may have therapeutic implications which await clinical proof-of-concept. [Table: see text]
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Affiliation(s)
| | - J. Moss
- University of Chicago, Chicago, IL
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Dudek SM, Camp SM, Chiang ET, Singleton PA, Usatyuk PV, Zhao Y, Natarajan V, Garcia JGN. Pulmonary endothelial cell barrier enhancement by FTY720 does not require the S1P1 receptor. Cell Signal 2007; 19:1754-64. [PMID: 17475445 PMCID: PMC2682440 DOI: 10.1016/j.cellsig.2007.03.011] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2007] [Revised: 03/22/2007] [Accepted: 03/22/2007] [Indexed: 10/23/2022]
Abstract
Novel therapeutic strategies are needed to reverse the loss of endothelial cell (EC) barrier integrity that occurs during inflammatory disease states such as acute lung injury. We previously demonstrated potent EC barrier augmentation in vivo and in vitro by the platelet-derived phospholipid, sphingosine 1-phosphate (S1P) via ligation of the S1P1 receptor. The S1P analogue, FTY720, similarly exerts barrier-protective vascular effects via presumed S1P1 receptor ligation. We examined the role of the S1P1 receptor in sphingolipid-mediated human lung EC barrier enhancement. Both S1P and FTY-induced sustained, dose-dependent barrier enhancement, reflected by increases in transendothelial electrical resistance (TER), which was abolished by pertussis toxin indicating Gi-coupled receptor activation. FTY-mediated increases in TER exhibited significantly delayed onset and intensity relative to the S1P response. Reduction of S1P1R expression (via siRNA) attenuated S1P-induced TER elevations whereas the TER response to FTY was unaffected. Both S1P and FTY rapidly (within 5 min) induced S1P1R accumulation in membrane lipid rafts, but only S1P stimulated S1P1R phosphorylation on threonine residues. Inhibition of PI3 kinase activity attenuated S1P-mediated TER increases but failed to alter FTY-induced TER elevation. Finally, S1P, but not FTY, induced significant myosin light chain phosphorylation and dramatic actin cytoskeletal rearrangement whereas reduced expression of the cytoskeletal effectors, Rac1 and cortactin (via siRNA), attenuated S1P-, but not FTY-induced TER elevations. These results mechanistically characterize pulmonary vascular barrier regulation by FTY720, suggesting a novel barrier-enhancing pathway for modulating vascular permeability.
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Affiliation(s)
- S M Dudek
- Section of Pulmonary and Critical Care Medicine, Department of Medicine, University of Chicago, 5841 South Maryland Ave. Chicago, IL 60637, United States.
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Singleton PA, Salgia R, Moreno-Vinasco L, Moitra J, Sammani S, Mirzapoiazova T, Dudek SM, Garcia J. 89 LIPID RAFT REGULATION OF HEPATOCYTE GROWTH FACTOR/C-MET-MEDIATED VASCULAR INTEGRITY: ROLE OF CD44, TIAM1/RAC1, DYNAMIN 2, AND CORTACTIN. J Investig Med 2007. [DOI: 10.1136/jim-55-02-89] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Zhao J, Singleton PA, Dudek SM, Natarajan L, Garcia JG. 72 PROTEOME ANALYSIS OF SPHINGOSINE 1-PHOSPHATE-MEDIATED LIPID RAFTS IN HUMAN PULMONARY ENDOTHELIAL CELLS. J Investig Med 2007. [DOI: 10.1136/jim-55-02-72] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Singleton PA, Lingen MW, Fekete MJ, Garcia JGN, Moss J. Methylnaltrexone inhibits opiate and VEGF-induced angiogenesis: role of receptor transactivation. Microvasc Res 2006; 72:3-11. [PMID: 16820176 DOI: 10.1016/j.mvr.2006.04.004] [Citation(s) in RCA: 143] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2006] [Revised: 04/18/2006] [Accepted: 04/19/2006] [Indexed: 11/22/2022]
Abstract
Angiogenesis or the formation of new blood vessels is important in the growth and metastatic potential of various cancers. Therefore, agents that inhibit angiogenesis have important therapeutic implications in numerous malignancies. We examined the effects of methylnaltrexone (MNTX), a peripheral mu opioid receptor antagonist, on agonist-induced human EC proliferation and migration, two key components in angiogenesis. Using human dermal microvascular EC, we observed that morphine sulfate (MS), the active metabolite, morphine-6-glucuronide (M6G), DAMGO ([d-Ala(2), N-Me-Phe(4), Gly(5)-ol]enkaphalin) and VEGF induced migration which were inhibited by pretreatment with MNTX at therapeutically relevant concentration (0.1 microM). The biologically inactive metabolite morphine-3-glucuronide (M3G) did not affect EC migration. We next examined the mechanism(s) by which MNTX inhibits opioid and VEGF-induced angiogenesis using human pulmonary microvascular EC. MS and DAMGO induced Src activation which was required for VEGF receptor transactivation and opioid-induced EC proliferation and migration. MNTX inhibited MS, DAMGO and VEGF induced tyrosine phosphorylation (transactivation) of VEGF receptors 1 and 2. Furthermore, MS, DAMGO and VEGF induced RhoA activation which was inhibited by MNTX or VEGF receptor tyrosine kinase inhibition. Finally, MNTX or silencing RhoA expression (siRNA) blocked MS, DAMGO and VEGF-induced EC proliferation and migration. Taken together, these results indicate that MNTX inhibits opioid-induced EC proliferation and migration via inhibition of VEGF receptor phosphorylation/transactivation with subsequent inhibition of RhoA activation. These results suggest that MNTX inhibition of angiogenesis can be a useful therapeutic intervention for cancer treatment.
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Affiliation(s)
- P A Singleton
- Department of Medicine, University of Chicago, Chicago, IL 60637, USA
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Singleton PA, Dore S, Garcia JG. 77 NOVEL MECHANISM OF PROSTAGLANDIN E2-MEDIATED ENDOTHELIAL CELL BARRIER ENHANCEMENT: ROLE OF EPCR, S1P1 RECEPTOR, EPAC, RAP1, AF-6, AND PROFILIN. J Investig Med 2006. [DOI: 10.2310/6650.2005.x0015.76] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Camp SM, Dudek SM, Chiang ET, Singleton PA, Bittman R, Sanchez T, Hla T, Garcia JG. 55 NOVEL ANALOGS OF FTY720 PROMOTE PULMONARY VASCULAR BARRIER FUNCTION. J Investig Med 2006. [DOI: 10.2310/6650.2005.x0015.54] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Camp SM, Dudek SM, Chiang ET, Singleton PA, Natarajan V, Garcia JG. 22 FTY720 ENHANCEMENT OF PULMONARY ENDOTHELIAL BARRIER FUNCTION IS S1P1 RECEPTOR INDEPENDENT. J Investig Med 2005. [DOI: 10.2310/6650.2005.00206.21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Finigan JH, Dudek SM, Singleton PA, Chiang ET, Camp SM, Ye SQ, Garcia JG. 45 ACTIVATED PROTEIN C ATTENUATES THROMBIN-INDUCED BARRIER DYSFUNCTION IN HUMAN PULMONARY ARTERY ENDOTHELIAL CELLS VIA AN ENDOTHELIAL PROTEIN C RECEPTOR-DEPENDENT MECHANISM. J Investig Med 2005. [DOI: 10.2310/6650.2005.00206.44] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Singleton PA, Garcia JG. 39 REGULATION OF SPHINGOSINE 1-PHOSPHATE-INDUCED ENDOTHELIAL CYTOSKELETAL REARRANGEMENT AND BARRIER ENHANCEMENT BY S1P1 RECEPTOR, CAVEOLIN-ENRICHED MICRODOMAINS, PI3 KINASE AND TIAM1/RAC1. J Investig Med 2005. [DOI: 10.2310/6650.2005.00206.38] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Bourguignon LY, Zhu H, Zhou B, Diedrich F, Singleton PA, Hung MC. Hyaluronan promotes CD44v3-Vav2 interaction with Grb2-p185(HER2) and induces Rac1 and Ras signaling during ovarian tumor cell migration and growth. J Biol Chem 2001; 276:48679-92. [PMID: 11606575 DOI: 10.1074/jbc.m106759200] [Citation(s) in RCA: 147] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
In this study we initially examined the interaction between CD44v3 (a hyaluronan (HA) receptor) and Vav2 (a guanine nucleotide exchange factor) in human ovarian tumor cells (SK-OV-3.ipl cell line). Immunological data indicate that both CD44v3 and Vav2 are expressed in SK-OV-3.ipl cells and that these two proteins are physically linked as a complex in vivo. By using recombinant fragments of Vav2 and in vitro binding assays, we have detected a specific binding interaction between the SH3-SH2-SH3 domain of Vav2 and the cytoplasmic domain of CD44. In addition, we have observed that the binding of HA to CD44v3 activates Vav2-mediated Rac1 signaling leading to ovarian tumor cell migration. Further analyses indicate that the adaptor molecule, growth factor receptor-bound protein 2 (Grb2) that is bound to p185(HER2) (an oncogene product), is also associated with the CD44v3-Vav2 complex. HA binding to SK-OV-3.ipl cells promotes recruitment of both Grb2 and p185(HER2) to the CD44v3-Vav2 complex leading to Ras activation and ovarian tumor cell growth. In order to determine the role of Grb2 in CD44v3 signaling, we have transfected SK-OV-3.ipl cells with Grb2 mutant cDNAs (e.g. Delta N-Grb2 that has a deletion in the amino-terminal SH3 domain or Delta C-Grb2 that has a deletion in the carboxyl-terminal SH3 domain). Our results clearly indicate that the SH3 domain deletion mutants of Grb2 (i.e. the Delta N-Grb2 (and to a lesser extent the Delta C-Grb2) mutant) not only block their association with p185(HER2) but also significantly impair their binding to the CD44v3-Vav2 complex and inhibit HA/CD44v3-induced ovarian tumor cell behaviors. Taken together, these findings strongly suggest that the interaction of CD44v3-Vav2 with Grb2-p185(HER2) plays an important role in the co-activation of both Rac1 and Ras signaling that is required for HA-mediated human ovarian tumor progression.
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Affiliation(s)
- L Y Bourguignon
- Enocrine Unit, Department of Medicine, University of California and Veterans Affairs Medical Center, San Francisco, California 94121, USA.
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Abstract
The present study evaluated the expression of tenascin by astrocytes in the supraoptic nucleus and associated ventral glial limitans (SON-VGL) under conditions that induce reversible changes in neuronal organization (dehydration and rehydration). Immunostaining of astroglia cultured from rat neonatal SON-VGL confirmed that these cells are capable of both expressing and secreting tenascin. Observations of immunostained tissue sections from adult rats revealed tenascin immunoreactivity primarily in the VGL and dendritic zone, subjacent to SON neuronal somata. Comparison of immunostained tissues from hydrated and dehydrated animals showed an apparent decrease in the intensity of immunostaining with dehydration. Subsequent Western blots of similar tissues confirmed the presence of the 210-220-kDa tenascin protein in the SON-VGL. SON-VGL tissues from control, dehydrated, and rehydrated rats were then studied by using SDS-PAGE and quantitative gel densitometry. A consistent decrease in tenascin concentration was observed by 6 days of dehydration that, with rehydration, reversed back toward or beyond control levels. Together, these observations indicate that SON-VGL astrocytes variably express tenascin and that this protein may play a role in adult SON plasticity.
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Affiliation(s)
- P A Singleton
- Department of Anatomy, West Virginia University School of Medicine, Morgantown 26505, USA
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Bender SL, Hays DS, Klug R, Matsuzaka H, Singleton PA. The teaching of psychiatry in the correctional institution at the third year level: a new dimension in the medical school curriculum at New York Medical College. Psychiatr J Univ Ott 1985; 10:139-45. [PMID: 3903805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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