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Selby PR, Shakib S, Peake SL, Warner MS, Yeung D, Hahn U, Roberts JA. A Systematic Review of the Clinical Pharmacokinetics, Pharmacodynamics and Toxicodynamics of Ganciclovir/Valganciclovir in Allogeneic Haematopoietic Stem Cell Transplant Patients. Clin Pharmacokinet 2021; 60:727-739. [PMID: 33515202 DOI: 10.1007/s40262-020-00982-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/24/2020] [Indexed: 12/29/2022]
Abstract
BACKGROUND Ganciclovir (GCV) and valganciclovir (VGCV) are the first-line agents used to prevent and treat cytomegalovirus (CMV) infection in allogeneic haematopoietic stem cell transplant (alloHCT) patients. OBJECTIVE The aim of this work was to describe available data for the clinical pharmacokinetics, pharmacodynamics and toxicodynamics of GCV and VGCV and the potential of a therapeutic drug monitoring strategy to improve outcomes in the alloHCT population. METHODS We systematically reviewed the pharmacokinetics (dose-exposure), pharmacodynamics (exposure-efficacy) and toxicodynamics (exposure-toxicity) of GCV and VGCV in alloHCT patients with CMV infection. Studies including alloHCT patients treated for CMV infection reporting the pharmacokinetics, pharmacodynamics and toxicodynamics of GCV or VGCV were searched for using the PUBMED and EMBASE databases from 1946 to 2019. Only studies involving participants > 12 years of age and available in the English language were included. RESULTS A total of 179 patients were included in the 14 studies that met the inclusion criteria, of which 6 examined GCV pharmacokinetics only, while 8 also examined GCV pharmacodynamics and toxicodynamics. Reported pharmacokinetic parameters showed considerable interpatient variability and were different from other populations, such as solid organ transplant and human immunodeficiency virus-infected patients. Only one study found a correlation between neutropenia and elevated peak and trough GCV concentrations, with no other significant pharmacodynamic and toxicodynamic relationships identified. While therapeutic drug monitoring of GCV is performed in some institutions, no association between GCV therapeutic drug monitoring and clinical outcomes was identified. CONCLUSION Further studies of the pharmacokinetics, pharmacodynamics and toxicodynamics of GCV/VGCV in alloHCT patients are required to identify a more robust therapeutic range and to subsequently quantify the potential value of therapeutic drug monitoring of GCV/VGCV in the alloHCT population.
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Affiliation(s)
- Philip Roland Selby
- School of Medicine, University of Adelaide, Adelaide, SA, Australia. .,Pharmacy Department, Royal Adelaide Hospital, Port Road, Adelaide, SA, 5000, Australia.
| | - Sepehr Shakib
- School of Medicine, University of Adelaide, Adelaide, SA, Australia.,Department of Clinical Pharmacology, Royal Adelaide Hospital, Adelaide, SA, Australia
| | - Sandra L Peake
- School of Medicine, University of Adelaide, Adelaide, SA, Australia.,Department of Intensive Care Medicine, The Queen Elizabeth Hospital, Adelaide, SA, Australia
| | - Morgyn S Warner
- School of Medicine, University of Adelaide, Adelaide, SA, Australia.,Infectious Diseases Unit, The Queen Elizabeth Hospital, Adelaide, SA, Australia.,SA Pathology, Adelaide, SA, Australia
| | - David Yeung
- School of Medicine, University of Adelaide, Adelaide, SA, Australia.,SA Pathology, Adelaide, SA, Australia.,Haematology Unit, Royal Adelaide Hospital, Adelaide, SA, Australia.,Cancer Theme, South Australian Health and Medical Research Institute, Adelaide, SA, Australia
| | - Uwe Hahn
- School of Medicine, University of Adelaide, Adelaide, SA, Australia.,SA Pathology, Adelaide, SA, Australia.,Haematology Unit, Royal Adelaide Hospital, Adelaide, SA, Australia
| | - Jason A Roberts
- Faculty of Medicine and Centre for Translational Anti-infective Pharmacodynamics, School of Pharmacy, University of Queensland Centre for Clinical Research (UQCCR), The University of Queensland, St Lucia, QLD, Australia.,Departments of Pharmacy and Intensive Care Medicine, Royal Brisbane and Women's Hospital, Brisbane, QLD, Australia.,Division of Anaesthesiology Critical Care Emergency and Pain Medicine, Nîmes University Hospital, University of Montpellier, Nîmes, France
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2
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Gong J, Meyerowitz EA, Isidro RA, Kaye KM. Primary cytomegalovirus infection with invasive disease in a patient with inflammatory bowel disease. BMJ Case Rep 2019; 12:12/9/e230056. [PMID: 31570344 PMCID: PMC6768388 DOI: 10.1136/bcr-2019-230056] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
A 37-year-old woman with a history of inflammatory bowel disease on mercaptopurine presented with a week of recurrent fever, headache, myalgias and mildly elevated serum transaminases and leucopenia. Her workup revealed primary cytomegalovirus (CMV) infection with atypical lymphocytosis, elevated viral load, positive IgM and negative IgG. Two weeks after her initial presentation, she developed odynophagia and diarrhoea prompting endoscopic evaluation with biopsies, which demonstrated CMV disease of the gastrointestinal tract. Her fever and systemic symptoms improved rapidly with initiation of intravenous ganciclovir. She was transitioned to and maintained on oral valganciclovir until two and half months after discharge when her symptoms and lab abnormalities had fully subsided.
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Affiliation(s)
- Jingyi Gong
- Internal Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA
| | | | - Raymond A Isidro
- Anatomic Pathology, Brigham and Women's Hospital, Boston, Massachusetts, USA
| | - Kenneth M Kaye
- Infectious Diseases, Brigham and Women's Hospital, Boston, Massachusetts, USA
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Caskurlu H, Karadag FY, Arslan F, Cag Y, Vahaboglu H. Comparison of universal prophylaxis and preemptive approach for cytomegalovirus associated outcome measures in renal transplant patients: A meta-analysis of available data. Transpl Infect Dis 2018; 21:e13016. [PMID: 30358045 DOI: 10.1111/tid.13016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Revised: 09/15/2018] [Accepted: 10/16/2018] [Indexed: 12/23/2022]
Abstract
Cytomegalovirus (CMV) is a ubiquitous latent human virus that often causes complications in renal transplantation recipients. Universal prophylaxis and preemptive therapy are alternative strategies to prevent CMV associated complications. This meta-analysis aimed to assess available data comparing the effectiveness of prophylaxis and preemptive therapy for preventing adverse outcomes. We searched the PubMed, Ovid, Web of Science, Cochrane Library, and Open Grey databases using a combination of keywords. Random effects models along with the Paule-Mandel estimator were used to synthesize pooled effect estimates. Eleven studies were eligible for the final analysis. Universal prophylaxis was better at preventing CMV disease than the preemptive approach (risk difference = -0.0459; confidence intervals = -0.0791, -0.0127; P-value = 0.0067; number needed to treat [NNT] = 22 [1/0.0459]; high, 79 [1/0.0127] patients; low, 13 [1/0.0791] patients). Subgroup analysis revealed a more consistent effect among studies published after 2010, with negligible between-study heterogeneity. The NNT for universal prophylaxis to prevent one excess CMV disease concerning preemptive therapy was 16 (1/0.0630) patients (high, 25 [1/0.0394]; low, 12 [1/0.0867] patients) in the subgroup of studies performed after 2010. We detected no significant difference between the two strategies regarding acute rejection and graft loss, with negligible variability due to heterogeneity between studies. Although universal prophylaxis performed better than the preemptive strategy for the prevention of CMV disease, the high NNT value may discourage the use of CMV prophylaxis. Since there were no differences between the strategies concerning acute rejection and graft loss, this study supports the use of the preemptive approach as an alternative to universal prophylaxis.
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Affiliation(s)
- Hulya Caskurlu
- Enfeksiyon Hastalıkları ve Klinik Mikrobiyoloji, Istanbul Medeniyet Universitesi, Istanbul, Turkey
| | - Fatma Y Karadag
- Enfeksiyon Hastalıkları ve Klinik Mikrobiyoloji, Istanbul Medeniyet Universitesi, Istanbul, Turkey
| | - Ferhat Arslan
- Enfeksiyon Hastalıkları ve Klinik Mikrobiyoloji, Istanbul Medeniyet Universitesi, Istanbul, Turkey
| | - Yasemin Cag
- Enfeksiyon Hastalıkları ve Klinik Mikrobiyoloji, Istanbul Medeniyet Universitesi, Istanbul, Turkey
| | - Haluk Vahaboglu
- Enfeksiyon Hastalıkları ve Klinik Mikrobiyoloji, Istanbul Medeniyet Universitesi, Istanbul, Turkey
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4
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Lilleri D, Gerna G. Strategies to control human cytomegalovirus infection in adult hematopoietic stem cell transplant recipients. Immunotherapy 2017; 8:1135-49. [PMID: 27485084 DOI: 10.2217/imt-2015-0028] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Human cytomegalovirus (HCMV) represents the major viral complication after hematopoietic stem cell transplantation. HCMV infection may be controlled by the reconstituting immune system and remain subclinical or can lead to severe systemic and/or organ disease (mainly pneumonia and gastroenteritis) when immune reconstitution is delayed or impaired. In order to prevent the occurrence of HCMV disease, a prompt diagnosis of HCMV infection is mandatory. The adoption of pre-emptive therapy strategies guided by virological monitoring dramatically reduced the occurrence of HCMV disease. However, late-onset end-organ disease may occur in some patients with apparent immune reconstitution. In the near future, introduction of immunological monitoring and immunotherapies could markedly improve management of HCMV infection.
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Affiliation(s)
- Daniele Lilleri
- Laboratori Sperimentali di Ricerca-Area Trapiantologica, Fondazione IRCCS Policlinico San Matteo, 27100 Pavia, Italy.,Università della Svizzera Italiana, Institute for Research in Biomedicine, 6500 Bellinzona, Switzerland
| | - Giuseppe Gerna
- Laboratori Sperimentali di Ricerca-Area Trapiantologica, Fondazione IRCCS Policlinico San Matteo, 27100 Pavia, Italy
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Nishihori T, Shaheen M, El-Asmar J, Aljurf M, Kharfan-Dabaja MA. Therapeutic strategies for cytomegalovirus in allogeneic hematopoietic cell transplantation. Immunotherapy 2015; 7:1059-71. [PMID: 26507225 DOI: 10.2217/imt.15.70] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Cytomegalovirus (CMV) remains a major cause of morbidity and mortality in allogeneic hematopoietic cell transplantation. Advances in surveillance of cytomegalovirus reactivation using sensitive techniques and a preemptive strategy to treat virus reactivation has reduced incidence of cytomegalovirus end organ disease. However, severe immunosuppression associated with extensive T-cell depletion resulting from graft-versus-host disease prevention for cases of mismatched or others such as haploidentical allogeneic hematopoietic cell transplantation (allo-HCT) and graft-versus-host disease therapy itself create clinical challenges in managing cytomegalovirus infection. Novel anticytomegalovirus therapies including newer pharmacologic interventions, vaccines, and adoptive cellular therapies to restore anticytomegalovirus immunity appear promising and are expected to continue to shape our treatment armamentarium. Eradication of CMV disease altogether, rather than simply suppressing viremia, should be the ultimate desirable goal.
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Affiliation(s)
- Taiga Nishihori
- Department of Blood & Marrow Transplantation, H Lee Moffitt Cancer Center, 12902 Magnolia Drive, FOB-3, Tampa, FL, USA.,Department of Oncologic Sciences, University of South Florida College of Medicine, Tampa, FL, USA
| | - Marwan Shaheen
- Section of Adult Hematology and Blood & Marrow Transplantation, King Faisal Specialist Hospital & Research Centre, Riyadh, Kingdom of Saudi Arabia
| | - Jessica El-Asmar
- Faculty of Medicine, American University of Beirut, Beirut, Lebanon
| | - Mahmoud Aljurf
- Section of Adult Hematology and Blood & Marrow Transplantation, King Faisal Specialist Hospital & Research Centre, Riyadh, Kingdom of Saudi Arabia
| | - Mohamed A Kharfan-Dabaja
- Department of Blood & Marrow Transplantation, H Lee Moffitt Cancer Center, 12902 Magnolia Drive, FOB-3, Tampa, FL, USA.,Department of Oncologic Sciences, University of South Florida College of Medicine, Tampa, FL, USA
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Yahng SA, Kim JH, Jeon YW, Yoon JH, Shin SH, Lee SE, Cho BS, Eom KS, Kim YJ, Lee S, Min CK, Cho SG, Kim DW, Lee JW, Min WS, Park CW, Kim HJ. A well-tolerated regimen of 800 cGy TBI-fludarabine-busulfan-ATG for reliable engraftment after unmanipulated haploidentical peripheral blood stem cell transplantation in adult patients with acute myeloid leukemia. Biol Blood Marrow Transplant 2014; 21:119-29. [PMID: 25300871 DOI: 10.1016/j.bbmt.2014.09.029] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Accepted: 09/30/2014] [Indexed: 01/07/2023]
Abstract
Eighty adult patients with acute myeloid leukemia (AML) received peripheral blood T cell-replete HLA haploidentical hematopoietic stem cell transplantation (haplo-HSCT). Disease status at transplantation was either first or second complete remission (CR, n = 69) or relapse/refractory (n = 11). Identical transplant-related procedures with conditioning regimen consisting of fractionated 800 cGy total body irradiation (TBI), fludarabine (30 mg/m(2)/day for 5 days), busulfan (3.2 mg/kg/day for 2 days), and antithymocyte globulin (1.25 mg/kg/day on days -4 to -1) and graft-versus-host disease (GVHD) prophylaxis with tacrolimus and methotrexate were used in all patients. Recovery of neutrophil (median, 11 days) and platelet (median, 10 days) counts was achieved in all patients with full donor chimerism (≥ 99%), and no delayed engraftment failure was observed. The cumulative incidence of grades III to IV acute GVHD and moderate to severe chronic GVHD was 11.2% and 26.3%, respectively. A donor CD8(+) and CD4(+) T cell dose above the median value was significantly associated with the incidences of grades II to IV acute GHVD and moderate to severe chronic GVHD, respectively. After a median follow-up of 28 months for survivors, the 2-year cumulative incidences of relapse (n = 20) and nonrelapse mortality (n = 10) were 26.6% and 12.2%, respectively. Although all but 1 patient in relapse/refractory status died, the 2-year overall and progression-free survival of patients in first CR was 82.5% and 75.1%, respectively. We suggest the strategy of fractionated 800 cGy TBI-based conditioning with unmanipulated peripheral blood stem cell grafts seems feasible with favorable outcomes for adult patients with AML undergoing haplo-HSCT in CR.
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Affiliation(s)
- Seung-Ah Yahng
- Department of Hematology, Incheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Jung-Ho Kim
- Catholic Blood and Marrow Transplantation Center, Department of Hematology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Young-Woo Jeon
- Catholic Blood and Marrow Transplantation Center, Department of Hematology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Jae-Ho Yoon
- Catholic Blood and Marrow Transplantation Center, Department of Hematology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Seung-Hwan Shin
- Catholic Blood and Marrow Transplantation Center, Department of Hematology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Sung-Eun Lee
- Catholic Blood and Marrow Transplantation Center, Department of Hematology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Byung-Sik Cho
- Catholic Blood and Marrow Transplantation Center, Department of Hematology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea; Cancer Research Institute, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Ki-Seong Eom
- Catholic Blood and Marrow Transplantation Center, Department of Hematology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea; Cancer Research Institute, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Yoo-Jin Kim
- Catholic Blood and Marrow Transplantation Center, Department of Hematology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Seok Lee
- Catholic Blood and Marrow Transplantation Center, Department of Hematology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Chang-Ki Min
- Catholic Blood and Marrow Transplantation Center, Department of Hematology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Seok-Goo Cho
- Catholic Blood and Marrow Transplantation Center, Department of Hematology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Dong-Wook Kim
- Catholic Blood and Marrow Transplantation Center, Department of Hematology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea; Cancer Research Institute, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Jong-Wook Lee
- Catholic Blood and Marrow Transplantation Center, Department of Hematology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Woo-Sung Min
- Catholic Blood and Marrow Transplantation Center, Department of Hematology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Chong-Won Park
- Catholic Blood and Marrow Transplantation Center, Department of Hematology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Hee-Je Kim
- Catholic Blood and Marrow Transplantation Center, Department of Hematology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea; Cancer Research Institute, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
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Kekre N, Tokessy M, Mallick R, McDiarmid S, Huebsch L, Bredeson C, Allan D, Tay J, Tinmouth A, Sheppard D. Is Cytomegalovirus Testing of Blood Products Still Needed for Hematopoietic Stem Cell Transplant Recipients in the Era of Universal Leukoreduction? Biol Blood Marrow Transplant 2013; 19:1719-24. [DOI: 10.1016/j.bbmt.2013.09.013] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2013] [Accepted: 09/17/2013] [Indexed: 10/26/2022]
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Improving safety of preemptive therapy with oral valganciclovir for cytomegalovirus infection after allogeneic hematopoietic stem cell transplantation. BONE MARROW RESEARCH 2012; 2012:874601. [PMID: 23243512 PMCID: PMC3518946 DOI: 10.1155/2012/874601] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Accepted: 10/24/2012] [Indexed: 11/25/2022]
Abstract
Valganciclovir (VGC), an oral prodrug of ganciclovir (GCV), has been shown to clear cytomegalovirus (CMV) viremia in preemptive treatment of patients after allogeneic hematopoietic stem cell transplantation (alloHSCT), apparently without significant toxicity. Since VGC obviates hospitalization, it is increasingly being adopted, although not approved, in alloHSCT. When we retrospectively evaluated preemptive treatment with VGC versus GCV, foscarnet or cidofovir, in all 312 consecutive CMV viremias of 169 patients allotransplanted at our institution between 1996 and 2006, we found VGC more efficacious (79%) than non-VGC therapies (69%). The advantage of outpatient VGC, however, was outbalanced by more profound neutropenias (including two cases of agranulocytosis, one with graft loss) requiring subsequent prolonged rehospitalization. Thus, in a second, prospective cohort from 2007 to 2011 (all 202 consecutive CMV viremias of 118 yet older and sicker patients), we implemented twice weekly neutrophil monitoring during outpatient VGC treatment and avoided VGC maintenance therapy. While conserving efficacy (VGC 71%, non-VGC 72%), we could now demonstrate a reduced mean duration of hospitalization with VGC (9 days (0–66)) compared to non-VGC (25 days (0–115)), without any agranulocytosis episodes. We conclude that safe outpatient VGC therapy is possible in alloHSCT recipients, but requires frequent monitoring to prevent severe myelotoxicity.
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Initial low-dose valganciclovir as a preemptive therapy is effective for cytomegalovirus infection in allogeneic hematopoietic stem cell transplant recipients. Int J Hematol 2012; 96:94-100. [DOI: 10.1007/s12185-012-1087-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2012] [Revised: 04/18/2012] [Accepted: 04/19/2012] [Indexed: 10/28/2022]
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A pharmacodynamic model of ganciclovir antiviral effect and toxicity for lymphoblastoid cells suggests a new dosing regimen to treat cytomegalovirus infection. Antimicrob Agents Chemother 2012; 56:3732-8. [PMID: 22526305 DOI: 10.1128/aac.06423-11] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
In bone marrow transplantation, the efficacy of ganciclovir in cytomegalovirus (CMV) disease treatment or prophylaxis remains partial. Because its hematological toxicity is dose limiting, optimization of the dosing schedule is required to increase its therapeutic index. The goal of our study was to describe the influence of the ganciclovir concentration and duration of exposure on cell survival and antiviral efficacy. The study was carried out in vitro on cultures of lymphoblastoid cells infected or not with the CMV AD169 reference strain and exposed to ganciclovir at different concentrations for 1, 2, 7, or 14 days. The data were analyzed by a mathematical model that allowed a quantitative characterization of ganciclovir pharmacodynamics and its variability. Simulations of the model were undertaken to determine the optimal concentration profile for maximizing the ganciclovir therapeutic index. Ganciclovir had very little toxic and antiviral effect, even at 20 mg liter(-1), when the duration of exposure was ≤ 7 days. A biologically significant effect was observed only with a 14-day exposure. Complete inhibition of viral replication was obtained at 20 mg liter(-1). The utility function, assuming equal weights for antiviral effect and toxicity, showed that maximal utility was reached around 10 mg liter(-1). The optimal ganciclovir concentration profile consisted of maintaining the concentration at 20 mg liter(-1) at the intervals 0 to 2 days and 7.58 to 9.58 days and a null concentration at other times. This optimal profile could be obtained by intravenous (i.v.) ganciclovir at 10 mg/kg of body weight twice daily (b.i.d.) at days 1, 2, 8.5, and 9.5 in stem cell transplant patients with normal renal function.
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