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Milano M, Peterson C, Zhang H, Singh D, Chen Y. Second Primary (SP) Lung Cancer (LC) After Head and Neck Squamous Cell Carcinoma (HNSCC): Population-based Study Of Risk Factors. Int J Radiat Oncol Biol Phys 2011. [DOI: 10.1016/j.ijrobp.2011.06.790] [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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Vikingsson S, Carlsson B, Coulthard S, Josefsson M, Aimer S, Peterson C. 9239 POSTER Rapid Method to Measure Thioguanine Incorporation Into DNA. Eur J Cancer 2011. [DOI: 10.1016/s0959-8049(11)72504-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Peterson C, Alkar A, Smith S, Kerr S, Hall J, Moore D, Kasimanickam R. Effects of one versus two doses of prostaglandin F2alpha on AI pregnancy rates in a 5-day, progesterone-based, CO-Synch protocol in crossbred beef heifers. Theriogenology 2011; 75:1536-42. [DOI: 10.1016/j.theriogenology.2010.12.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2010] [Revised: 12/20/2010] [Accepted: 12/21/2010] [Indexed: 10/18/2022]
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Bradbury AR, Patrick-Miller L, Fetzer D, Egleston B, Cummings SA, Forman A, Bealin L, Peterson C, Corbman M, O'Connell J, Daly MB. Genetic counselor opinions of, and experiences with telephone communication of BRCA1/2 test results. Clin Genet 2010; 79:125-31. [PMID: 21039431 DOI: 10.1111/j.1399-0004.2010.01540.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
BRCA1/2 test disclosure has, historically, been conducted in-person by genetics professionals. Given increasing demand for, and access to, genetic testing, interest in telephone and Internet genetic services, including disclosure of test results, has increased. Semi-structured interviews with genetic counselors were conducted to determine interest in, and experiences with telephone disclosure of BRCA1/2 test results. Descriptive data are summarized with response proportions. One hundred and ninety-four genetic counselors completed self-administered surveys via the web. Although 98% had provided BRCA1/2 results by telephone, 77% had never provided pre-test counseling by telephone. Genetic counselors reported perceived advantages and disadvantages to telephone disclosure. Thirty-two percent of participants described experiences that made them question this practice. Genetic counselors more frequently reported discomfort with telephone disclosure of a positive result or variant of uncertain significance (p < 0.01) than other results. Overall, 73% of participants reported interest in telephone disclosure. Many genetic counselors have provided telephone disclosure, however, most, infrequently. Genetic counselors identify potential advantages and disadvantages to telephone disclosure, and recognize the potential for testing and patient factors to impact patient outcomes. Further research evaluating the impact of testing and patient factors on cognitive, affective, social and behavioral outcomes of alternative models of communicating genetic information is warranted.
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Vikingsson S, Carlsson B, Almer S, Peterson C. How should thiopurine treatment be monitored?--methodological aspects. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2010; 29:278-83. [PMID: 20544507 DOI: 10.1080/15257771003741133] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Monitoring of thiopurine metabolites is important due to a complex metabolism with large interindividual variation, but the suitability of currently used methods has been questioned. The drawbacks include poor reproducibility, the inability to differentiate between the different analytes, as well as the use of a nontarget matrix. Further research should be directed toward measuring thiopurine metabolites in mononuclear cells, measuring the different nucleotides specifically, as well as measuring the incorporation of thioguanine into DNA. The studies should not be limited to thioguanosine nucleotides but include methylthioinosine nucleotides as well.
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Ai AL, Ladd KL, Peterson C, Cook CA, Shearer M, Koenig HG. Long-term Adjustment After Surviving Open Heart Surgery: The Effect of Using Prayer for Coping Replicated in a Prospective Design. THE GERONTOLOGIST 2010; 50:798-809. [PMID: 20634280 DOI: 10.1093/geront/gnq046] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
PURPOSE despite the growing evidence for effects of religious factors on cardiac health in general populations, findings are not always consistent in sicker and older populations. We previously demonstrated that short-term negative outcomes (depression and anxiety) among older adults following open heart surgery are partially alleviated when patients employ prayer as part of their coping strategy. The present study examines multifaceted effects of religious factors on long-term postoperative adjustment, extending our previous findings concerning prayer and coping with cardiac disease. DESIGN AND METHODS analyses capitalized on a preoperative survey and medical variables from the Society of Thoracic Surgeons' National Database of patients undergoing open heart surgery. The current participants completed a mailed survey 30 months after surgery. Two hierarchical regressions were performed to evaluate the extent to which religious factors predicted depression and anxiety, after controlling for key demographics, medical indices, and mental health. RESULTS predicting lower levels of depression at the follow-up were preoperative use of prayer for coping, optimism, and hope. Predicting lower levels of anxiety at the follow-up were subjective religiousness, marital status, and hope. Predicting poorer adjustment were reverence in religious contexts, preoperative mental health symptoms, and medical comorbidity. Including optimism and hope in the model did not eliminate effects of religious factors. Several other religious factors had no long-term influences. MPLICATIONS: the influence of religious factors on the long-term postoperative adjustment is independent and complex, with mediating factors yet to be determined. Future research should investigate mechanisms underlying religion-health relations.
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Fantino E, Squires N, Delbrück N, Peterson C. Choice behavior and the accessibility of the reinforcer. J Exp Anal Behav 2010; 18:35-43. [PMID: 16811616 PMCID: PMC1333982 DOI: 10.1901/jeab.1972.18-35] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
In Experiment 1, matching of relative response rates to relative rates of reinforcement was obtained in concurrent variable-interval schedules when the absolute values of the two concurrent variable-interval schedules varied from 6 sec and 12 sec to 600 sec and 1200 sec. Increases in the duration of the changeover delay, however, produced decreases in the relative response rates and, consequently, some deviation from matching. In Experiment 2, matching of relative response rates to the relative duration of the reinforcer failed to occur when the equal variable-interval schedules arranging access to the two different reinforcer durations (1.5 and 6 sec) were varied in size from concurrent variable-interval 10-sec schedules to concurrent variable-interval 600-sec schedules.
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O'Shea FD, Boyle E, Salonen DC, Ammendolia C, Peterson C, Hsu W, Inman RD. Inflammatory and degenerative sacroiliac joint disease in a primary back pain cohort. Arthritis Care Res (Hoboken) 2010; 62:447-54. [DOI: 10.1002/acr.20168] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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González FI, Geist EL, Jaffe B, Kânoğlu U, Mofjeld H, Synolakis CE, Titov VV, Arcas D, Bellomo D, Carlton D, Horning T, Johnson J, Newman J, Parsons T, Peters R, Peterson C, Priest G, Venturato A, Weber J, Wong F, Yalciner A. Probabilistic tsunami hazard assessment at Seaside, Oregon, for near- and far-field seismic sources. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jc005132] [Citation(s) in RCA: 189] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Landau S, Provenza F, Gardner D, Pfister J, Knoppel E, Peterson C, Kababya D, Needham G, Villalba J. Neem-tree (Azadirachta indica Juss.) extract as a feed additive against the American dog tick (Dermacentor variabilis) in sheep (Ovis aries). Vet Parasitol 2009; 165:311-7. [DOI: 10.1016/j.vetpar.2009.07.047] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2009] [Revised: 06/30/2009] [Accepted: 07/09/2009] [Indexed: 11/26/2022]
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Paul C, Tidefelt U, Gahrton G, Björkholm M, Järnmark M, Killander A, Kimby E, Liliemark J, Lindeberg A, Lindquist R, Lockner D, Lönnqvist B, Mellstedt H, Merk K, Palmblad J, Peterson C, Simonsson B, Stalfelt AM, Sundström C, Wadman B, Wedelin C, Udén AM, Öberg G, öst Å. A Randomized Comparison of Doxorubicin and Doxorubicin-DNA in the Treatment of Acute NonLymphoblastic Leukemia. Leuk Lymphoma 2009; 3:355-64. [DOI: 10.3109/10428199109070279] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Lindquist R, Vitols S, Gahrton G, Ost A, Peterson C. Low density lipoprotein receptor activity in human leukemic cells--relation to chromosome aberrations. ACTA MEDICA SCANDINAVICA 2009; 217:553-8. [PMID: 2992236 DOI: 10.1111/j.0954-6820.1985.tb03262.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Chromosome analysis and low density lipoprotein (LDL) receptor activity of leukemic cells from 38 patients with acute non-lymphocytic leukemia were correlated. Clonal chromosome aberrations were found in 22 patients, and an extra chromosome 8 was found in 7 of them. LDL receptor activity was significantly higher in patients with an extra chromosome 8 than in patients with other abnormalities or a normal karyotype. Chromosome 8 may harbor genes of importance for the expression of the LDL receptor.
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Altavilla A, Giaquinto C, Giocanti D, Manfredi C, Aboulker JP, Bartoloni F, Cattani E, Lo Giudice M, Mellado Peña M, Nagler R, Peterson C, Vajnerova O, Bonifazi F, Ceci A. Activity of Ethics Committees in Europe on issues related to clinical trials in paediatrics: Results of a survey. ACTA ACUST UNITED AC 2009. [DOI: 10.3233/ppl-2009-0208] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Häkkimen J, Lagerholm M, Peterson C, Söderberg B. Local routing algorithms based on Potts neural networks. IEEE TRANSACTIONS ON NEURAL NETWORKS 2008; 11:970-7. [PMID: 18249823 DOI: 10.1109/72.857776] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
A feedback neural approach to static communication routing in asymmetric networks is presented, where a mean field formulation of the Bellman-Ford method for the single unicast problem is used as a common platform for developing algorithms for multiple unicast, multicast and multiple multicast problems. The appealing locality and update philosophy of the Bellman-Ford algorithm is inherited. For all problem types the objective is to minimize a total connection cost, defined as the sum of the individual costs of the involved arcs, subject to capacity constraints. The methods are evaluated for synthetic problem instances by comparing to exact solutions for cases where these are accessible, and else with approximate results from simple heuristics. In general, the quality of the results are better than those of the heuristics. Furthermore, the computational demands are modest, even when the distributed nature of the the approach is unexploited numerically.
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Dillman RO, Selvan SR, Schiltz PM, DePriest C, Peterson C, DeLeon C, McClay EF, Barth NM, Sheehy PF, Allen K. Patient-specific vaccines derived from proliferating autologous tumor cell lines and dendritic cells: Results of a phase II trial in metastatic melanoma. J Clin Oncol 2007. [DOI: 10.1200/jco.2007.25.18_suppl.8555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
8555 Background: Patient-specific vaccines utilizing proliferating tumor cells, or tumor stem cells, may be the ideal products for active specific immunotherapy. Methods: Eligible patients had recurrent or metastatic melanoma from which a cell line was established, expanded to 200 million cells, incubated with interferon-gamma, irradiated and cryopreserved. Autologous dendritic cells (DC) were derived from peripheral blood mononuclear cells cultured in IL-4 and GM-CSF. DC were incubated with the irradiated tumor cells, then cryopreserved in 20- million-cell aliquots, which were thawed, washed and suspended in 500 micrograms of GM-CSF for injection. Treatment consisted of s.c. injections weekly × 3, then monthly × 5 in a 2-stage phase II trial with two stratifications. Patients were characterized as having objectively measurable disease (OMD) or non-measurable disease (NMD). Plans were to enroll 30 to 80 patients: 15 to 40 with OMD, 15 to 40 with MD. Objectives were to determine safety, frequency of conversion of delayed type hypersensitivity (DTH) reactions to irradiated autologous tumor cells, objective response rate (ORR) using RECIST criteria, progression-free survival (PFS), overall survival (OS), and comparison to a historical control group. Results: Between January 2001 and April 2006, 55 patients were enrolled; 53 were eligible and evaluable. The 30 men and 23 women had a median age of 50 years; 15 had OMD and 38 NMD. Patients received an average of 7.4 vaccinations out of a possible 8. Treatment was well- tolerated. 25% had a positive tumor DTH test: 1 at baseline, 7 after 3 injections, 5 after 8 injections. ORR was 0/15. Follow up for the 39 surviving patients ranges from 7 to 67 months with a median of 30 months. Median PFS is 7.1 months with 24 patients remaining progression-free. Only 14 patients have died; median OS has not been reached. 5-year projected survival is 70%; 20 patients are alive 2.5 to 5.5 years from start of vaccine. OS is better than observed for 48 comparable patients that we treated previously in a trial with irradiated tumor cells without DC (p=0.016). Conclusion: This patient-specific vaccine approach is feasible, safe, associated with encouraging survival, and warrants further investigation. No significant financial relationships to disclose.
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Kahl BS, Peterson C, Blank J, McFarland T, Huie M, Eickhoff J, Werndli J, Callander N, Myers T. A feasibility study of VcR-CVAD with maintenance rituximab for untreated mantle cell lymphoma. J Clin Oncol 2007. [DOI: 10.1200/jco.2007.25.18_suppl.8062] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
8062 Introduction: Novel treatment strategies are needed for Mantle Cell Lymphoma (MCL). We have published the results of a study using a modified R-hyperCVAD induction followed by maintenance rituximab (Kahl et al, Ann Oncol 2006). This induction strategy yielded a complete response (CR) rate of 64%. Given the promising activity of bortezomib (VELCADER) in relapsed MCL, we hypothesized that the incorporation of VELCADE (Vc) into the induction regimen would improve the CR rate. Methods: Eligible patients have histologically confirmed MCL, PS 0–2, and adequate end organ function. VcR-CVAD regimen: Velcade 1.3 mg/m2 days 1 and 4, rituximab 375 mg/m2 IV day 1, cyclophosphamide 300 mg/m2 IV over 3 hrs q 12 hrs X 6 doses days 1–3, doxorubicin 50 mg/m2 CI over days 1–2, vincristine 2 mg IV day 3, dexamethasone 40 mg po days 1–4. The first 7 patients received a Vc dose of 1.5mg/m2 on days 1 and 4 but this was modified to 1.3 mg/m2 due to excessive peripheral neuropathy (PN). Cycles are repeated every 21 days for 6 cycles and all patients receive G-CSF cytokine support. Patients achieving at least a PR receive maintenance rituximab therapy. Results: Currently 15 patients are enrolled with 13 having completed the VcR-CVAD induction and two in active treatment. Patient characteristics: 11M, 4F, median age 64 (49–73), and 13/15 stage IV. Of the 13 assessable patients, one experienced PD during induction therapy and expired. The remaining 12 patients have all achieved a complete response (CR rate 92%) and are currently receiving maintenance rituximab. The major toxicities of this treatment regimen are painful PN and expected hematological toxicity. Five/seven patients at 1.5 mg/m2 and 3/6 patients at 1.3 mg/m2 experienced grade 3–4 PN. All PN eventually resolved to grade 1- 2 and resolved faster in the patients receiving 1.3 mg/m2. Conclusion: The VcR-CVAD induction has produced high overall and complete response rates (92%) in a very representative MCL patient population. A Vc dose of 1.3 mg/m2 is better tolerated than a dose of 1.5 mg/m2. However, PN remains an issue and the final cohort in this feasibility study will receive a vincristine dose of 1 mg. The encouraging response rates noted in this pilot study provide the basis for ECOG protocol 1405, which will test this regimen in a cooperative group setting. No significant financial relationships to disclose.
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Zarcone J, Napolitano D, Peterson C, Breidbord J, Ferraioli S, Caruso-Anderson M, Holsen L, Butler MG, Thompson T. The relationship between compulsive behaviour and academic achievement across the three genetic subtypes of Prader-Willi syndrome. JOURNAL OF INTELLECTUAL DISABILITY RESEARCH : JIDR 2007; 51:478-87. [PMID: 17493030 PMCID: PMC6706850 DOI: 10.1111/j.1365-2788.2006.00916.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
BACKGROUND Prader-Willi syndrome (PWS) is a genetic syndrome associated with several physical, cognitive and behavioural characteristics. For many individuals with this syndrome, compulsive behaviour is often noted in both food and non-food situations. The focus of this paper is on the non-food-related compulsions in individuals with PWS and comparing differences across the three genetic subtypes of the syndrome. METHODS Compulsive behaviours in 73 people with PWS were assessed using the Yale-Brown Obsessive Compulsive Scale and the Compulsive Behavior Checklist. Compulsive behaviour and its relation to IQ and academic achievement also were evaluated. Phenotypic differences were characterized for the three most common genetic subtypes of the disorder: 16 individuals with the long Type I (TI) 15q deletion, 26 individuals with the short Type II (TII) 15q deletion and 31 individuals with maternal disomy 15. RESULTS There appeared to be important differences between the two deletion subtypes. Specifically, individuals with the TI deletion had more compulsions regarding personal cleanliness (i.e. excessive bathing/grooming), and their compulsions were more difficult to interrupt and interfered with social activities more than the other subtypes. Individuals with the TII deletion were more likely to have compulsions related to specific academic areas (i.e. rereading, erasing answers and counting objects or numbers). CONCLUSIONS These findings may help clinicians and researchers identify possible intervention strategies and supports based on the behavioural phenotype associated with genetic subtype in individuals with PWS.
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Beattie DT, Cheruvu M, Mai N, O'Keefe M, Johnson-Rabidoux S, Peterson C, Kaufman E, Vickery R. The in vitro pharmacology of the peripherally restricted opioid receptor antagonists, alvimopan, ADL 08-0011 and methylnaltrexone. Naunyn Schmiedebergs Arch Pharmacol 2007; 375:205-20. [PMID: 17340127 DOI: 10.1007/s00210-007-0146-x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2006] [Accepted: 02/17/2007] [Indexed: 12/26/2022]
Abstract
This study characterized the pharmacology of the peripherally restricted opioid receptor antagonists, alvimopan, its metabolite, ADL 08-0011, and methylnaltrexone. The activities of the compounds were investigated with respect to human or guinea pig opioid receptor binding and function in recombinant cell lines and mechanical responsiveness of the guinea pig ileum. Alvimopan and ADL 08-0011 had higher binding affinity than methylnaltrexone at human mu opioid receptors (pK (i) values of 9.6, 9.6, and 8.0, respectively). The compounds had different selectivities for the mu receptor over human delta and guinea pig kappa opioid receptors. ADL 08-0011 had the highest mu receptor selectivity. With respect to their mu opioid receptor functional activity ([(35)S]GTPgammaS incorporation), methylnaltrexone had a positive intrinsic activity, consistent with partial agonism, unlike alvimopan and ADL 08-0011, which had negative intrinsic activities. Alvimopan, ADL 08-0011, and methylnaltrexone antagonized inhibitory responses mediated by the mu opioid agonist, endomorphin-1 (pA (2) values of 9.6, 9.4, and 7.6, respectively) and by U69593, a kappa opioid agonist (pA (2) values of 8.4, 7.2, and 6.7, respectively). In morphine-naive guinea pig ileum, methylnaltrexone reduced, while alvimopan and ADL 08-0011 increased, the amplitude of electrically evoked contractions and spontaneous mechanical activity. In tissue from morphine-dependent animals, alvimopan and ADL 08-0011 increased spontaneous activity to a greater degree than methylnaltrexone. The data suggested that alvimopan-induced contractions resulted predominantly from an interaction with kappa opioid receptors. It is concluded that alvimopan, ADL 08-0011, and methylnaltrexone differ in their in vitro pharmacological properties, particularly with respect to opioid receptor subtype selectivity and intrinsic activity. The clinical significance of the data from this study remains to be determined.
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MESH Headings
- Analgesics, Opioid/metabolism
- Analgesics, Opioid/pharmacology
- Animals
- Benzeneacetamides/pharmacology
- CHO Cells
- Cricetinae
- Cricetulus
- Dose-Response Relationship, Drug
- Enkephalin, Ala(2)-MePhe(4)-Gly(5)-/metabolism
- Enkephalin, Ala(2)-MePhe(4)-Gly(5)-/pharmacology
- Guanosine 5'-O-(3-Thiotriphosphate)/metabolism
- Guinea Pigs
- Humans
- Ileum/drug effects
- Ileum/metabolism
- Ileum/physiology
- In Vitro Techniques
- Male
- Morphine/pharmacology
- Muscle Contraction/drug effects
- Naltrexone/analogs & derivatives
- Naltrexone/metabolism
- Naltrexone/pharmacology
- Narcotic Antagonists/metabolism
- Narcotic Antagonists/pharmacology
- Oligopeptides/metabolism
- Oligopeptides/pharmacology
- Piperidines/metabolism
- Piperidines/pharmacology
- Pyrrolidines/pharmacology
- Quaternary Ammonium Compounds/metabolism
- Quaternary Ammonium Compounds/pharmacology
- Receptors, Opioid/agonists
- Receptors, Opioid/genetics
- Receptors, Opioid, delta/agonists
- Receptors, Opioid, delta/antagonists & inhibitors
- Receptors, Opioid, delta/genetics
- Receptors, Opioid, kappa/agonists
- Receptors, Opioid, kappa/antagonists & inhibitors
- Receptors, Opioid, kappa/genetics
- Receptors, Opioid, mu/agonists
- Receptors, Opioid, mu/antagonists & inhibitors
- Receptors, Opioid, mu/genetics
- Recombinant Proteins
- Transfection
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Lindqvist M, Hindorf U, Almer S, Söderkvist P, Ström M, Hjortswang H, Peterson C. No induction of thiopurine methyltransferase during thiopurine treatment in inflammatory bowel disease. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2007; 25:1033-7. [PMID: 17065060 DOI: 10.1080/15257770600890814] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
The aim of this study was to follow, during standardized initiation of thiopurine treatment, thiopurine methyltransferase (TPMT) gene expression and enzyme activity and thiopurine metabolite concentrations, and to study the role of TPMT and ITPA 94C > A polymorphisms for the development of adverse drug reactions. Sixty patients with ulcerative colitis or Crohn's disease were included in this open and prospective multi-center study. Thiopurine naïve patients were prescribed azathioprine (AZA), patients previously intolerant to AZA received 6-mercaptopurine (6-MP). The patients followed a predetermined dose escalation schedule, reaching target dose at Week 3; 2.5 and 1.25 mg/kg body weight for AZA and 6-MP, respectively. The patients were followed every week during Weeks 1-8 from baseline and then every 4 weeks until 20 weeks. TPMT activity and thiopurine metabolites were determined in erythrocytes, TPMT and ITPA genotypes, and TPMT gene expression were determined in whole blood. One homozygous TPMT-deficient patient was excluded. Five non compliant patients were withdrawn during the first weeks. Twenty-seven patients completed the study per protocol; 27 patients were withdrawn because of adverse events. Sixty-seven percent of the withdrawn patients tolerated thiopurines at a lower dose at Week 20. There was no difference in baseline TPMT enzyme activity between individuals completing the study and those withdrawn for adverse events (p = 0.45). A significant decrease in TPMT gene expression (TPMT/huCYC ratio, p = 0.02) was found, however TPMT enzyme activity did not change. TPMT heterozygous individuals had a lower probability of remaining in the study on the predetermined dose (p = 0.039). The ITPA 94C > A polymorphism was not predictive of adverse events (p = 0.35).
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Schar C, Jensen J, Blouse G, Minor K, Andreasen P, Peterson C. ID: 292 Defining the Second Site for Interaction of PAI-1 and Vitronectin. J Thromb Haemost 2006. [DOI: 10.1111/j.1538-7836.2006.00292.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Hindorf U, Lindqvist M, Peterson C, Söderkvist P, Ström M, Hjortswang H, Pousette A, Almer S. Pharmacogenetics during standardised initiation of thiopurine treatment in inflammatory bowel disease. Gut 2006; 55:1423-31. [PMID: 16543290 PMCID: PMC1856436 DOI: 10.1136/gut.2005.074930] [Citation(s) in RCA: 136] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Revised: 03/01/2006] [Accepted: 03/07/2006] [Indexed: 12/12/2022]
Abstract
BACKGROUND Firm recommendations about the way thiopurine drugs are introduced and the use of thiopurine methyltransferase (TPMT) and metabolite measurements during treatment in inflammatory bowel disease (IBD) are lacking. AIM To evaluate pharmacokinetics and tolerance after initiation of thiopurine treatment with a fixed dosing schedule in patients with IBD. PATIENTS 60 consecutive patients with Crohn's disease (n = 33) or ulcerative colitis (n = 27) were included in a 20 week open, prospective study. METHODS Thiopurine treatment was introduced using a predefined dose escalation schedule, reaching a daily target dose at week 3 of 2.5 mg azathioprine or 1.25 mg 6-mercaptopurine per kg body weight. TPMT and ITPA genotypes, TPMT activity, TPMT gene expression, and thiopurine metabolites were determined. Clinical outcome and occurrence of adverse events were monitored. RESULTS 27 patients completed the study per protocol, while 33 were withdrawn (early protocol violation (n = 5), TPMT deficiency (n = 1), thiopurine related adverse events (n = 27)); 67% of patients with adverse events tolerated long term treatment on a lower dose (median 1.32 mg azathioprine/kg body weight). TPMT activity did not change during the 20 week course of the study but a significant decrease in TPMT gene expression was found (TPMT/huCYC ratio; p = 0.02). Patients with meTIMP concentrations >11,450 pmol/8 x 10(8) red blood cells during steady state at week 5 had an increased risk of developing myelotoxicity (odds ratio = 45.0; p = 0.015). CONCLUSIONS After initiation of thiopurine treatment using a fixed dosing schedule, no general induction of TPMT enzyme activity occurred, though TPMT gene expression decreased. The development of different types of toxicity was unpredictable, but we found that measurement of meTIMP early in the steady state phase helped to identify patients at risk of developing myelotoxicity.
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Albertioni F, Pettersson B, Ohlman S, Peterson C. Analysis of Azathioprine and 6-Mercaptopurine in Plasma in Renal Transplant Recipients After Administration with Oral Azathioprine. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10826079508013741] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Hammoud A, Kerber R, Huang I, Peterson C, Gibson M, Hatasaka H. O-99. Fertil Steril 2006. [DOI: 10.1016/j.fertnstert.2006.07.116] [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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Shchuchinsky J, Peterson C. Stopping power and energy-loss stragglings of slow protons moving in carbon, aluminum and gold; effective-charge fractions and straggling of heavy ions. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/00337578408206070] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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