Amanda Termuhlen

Keck School of Medicine USC, Los Ángeles, California, United States

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Publications (69)181.06 Total impact

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    ABSTRACT: Background: Non-Hodgkin lymphoma (NHL) is a relatively common malignancy in pediatric patients; however, a small subgroup have unusual lymphoma subtypes for the pediatric population. Procedure: The Children's Oncology Group Rare and Cutaneous NHL registry's (protocol ANHL 04B1) main objectives were to determine the pathologic, biologic, and clinical features of rare and cutaneous pediatric NHL and establish a bank of centrally reviewed tissue specimens. We report the clinical data, treatment data, and outcome for rare pediatric NHL. Results: In 101 lymphomas, there is a 97.8% concordance between the reviewing study pathologists and an 87.6% concordance between the central and institutional pathology review. Samples in the specimen bank include primary tumor tissue that is snap frozen, in paraffin blocks, or H&E-stained and unstained paraffin slides as well as blood, serum, and bone marrow. This descriptive analysis shows that children with pediatric follicular lymphoma, mucosa-associated lymphoid tissue, nodal marginal zone lymphoma, primary cutaneous, primary central nervous system lymphoma, and subcutaneous panniculitis-like T-cell lymphomas have 100% survival at a median of 2 years from enrollment. There are early deaths, mostly from progressive disease, in subjects with peripheral T-cell (not otherwise specified), NKT, and hepatosplenic T-cell lymphomas. Conclusions: This registry provides high-quality biologic specimens with clinical data to investigators working on the biology of these unusual pediatric diseases.
    No preview · Article · Jan 2016 · Pediatric Blood & Cancer
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    ABSTRACT: Leukemia is one of the leading journals in hematology and oncology. It is published monthly and covers all aspects of the research and treatment of leukemia and allied diseases. Studies of normal hemopoiesis are covered because of their comparative relevance.
    No preview · Article · Sep 2015 · Leukemia
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    ABSTRACT: Visions for the future are a normal developmental process for adolescents and young adults (AYAs) with and without cancer, and these visions often include expectations of sexual and romantic relationships. AYA cancer survivors indicate reproductive health is an issue of great importance and more attention is needed in the health care setting throughout the cancer experience, beginning at diagnosis. Various practice guidelines are predominately focused on fertility; are intended to influence survivorship care plans; and do not encompass the broad scope of reproductive health that includes romantic partnering, friendships, body image, sexuality, sexual identity, fertility, contraception, and more. Although interventions to reduce reproductive health-related sequelae from treatment are best approached as an evolving process, practitioners are not certain of the priorities of these various reproductive health content areas. Strategies incongruent with the reproductive health priorities of AYAs will likely thwart adequate follow-up care and foster feelings of isolation from the treatment team. Research is needed to identify these priorities and ensure discussions of diverse content areas. This review explored various domains of reproductive health and emphasized how understanding the priorities of the AYA cancer cohort will guide future models of care. Cancer 2015. © 2015 American Cancer Society. © 2015 American Cancer Society.
    Full-text · Article · Jun 2015 · Cancer
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    ABSTRACT: Variability in prescribed doses of 6-mercaptopurine (6MP) and lack of adherence to a 6MP treatment regimen could result in intra-individual variability in systemic exposure to 6MP (measured as erythrocyte thioguanine nucleotide [TGN] levels) in children with acute lymphoblastic leukemia (ALL). The effect on relapse risk of this variability is unknown. To determine the effect of high intra-individual variability of 6MP systemic exposure on relapse risk in children with ALL. We used a prospective longitudinal design (Children's Oncology Group study [COG-AALL03N1]) to monitor 6MP and disease relapse in 742 children with ALL in ambulatory care settings of 94 participating institutions from May 30, 2005, to September 9, 2011. All participants met the following eligibility criteria: (1) diagnosis of ALL at 21 years or younger; (2) first continuous remission in progress at the time of study entry; (3) receiving self-, parent-, or caregiver-administered oral 6MP during maintenance therapy; and (4) completion of at least 6 months of maintenance therapy at the time of study enrollment. The median patient age at diagnosis was 5 years; 68% were boys; and 43% had National Cancer Institute-based high-risk disease. Daily 6MP regimen adherence was measured over 68 716 person-days using an electronic system that recorded the date and time of each 6MP bottle opening; adherence rate was defined as the ratio of days that a 6MP bottle was opened to days thata 6MP bottle was prescribed. Average monthly 6MP dose intensity was measured over 120 439 person-days by dividing the number of 6MP doses actually prescribed by the number of planned protocol doses (75 mg/m2/d). Monthly erythrocyte TGN levels (pmol/8 × 108 erythrocytes) were measured over 6 consecutive months per patient (n = 3944 measurements). Using intra-individual coefficients of variation (CV%), patients were classified as having stable (CV% <85th percentile) vs varying (CV% ≥85th percentile) indices. Median follow-up time was 6.7 years from the time of diagnosis. Adjusting for clinical prognosticators, we found that patients with 6MP nonadherence (mean adherence rate <95%) were at a 2.7-fold increased risk of relapse (95% CI, 1.3-5.6; P = .01) compared with patients with a mean adherence rate of 95% or greater. Among adherers, high intra-individual variability in TGN levels contributed to increased relapse risk (hazard ratio, 4.4; 95% CI, 1.2-15.7; P = .02). Furthermore, adherers with varying TGN levels had varying 6MP dose intensity (odds ratio [OR], 4.5; 95% CI, 1.5-13.4; P = .01) and 6MP drug interruptions (OR, 10.2; 95% CI, 2.2-48.3; P = .003). These findings emphasize the need to maximize 6MP regimen adherence and maintain steady thiopurine exposure to minimize relapse in children with ALL.
    No preview · Article · Jun 2015
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    ABSTRACT: We report the anti-leukemic potency of a unique biotargeted nanoscale liposomal nanoparticle (LNP) formulation of the spleen tyrosine kinase (SYK) P-site inhibitor C61. C61-loaded LNP were decorated with a murine CD19-specific monoclonal antibody directed against radiation-resistant CD19-receptor positive aggressive B-precursor acute lymphoblastic leukemia (ALL) cells. The biotargeted C61-LNP were more potent than untargeted C61-LNP and consistently caused apoptosis in B-precursor ALL cells. The CD19-directed C61-LNP also destroyed B-precursor ALL xenograft cells and their leukemia-initiating in vivo clonogenic fraction. This unique nanostructural therapeutic modality targeting the SYK-dependent anti-apoptotic blast cell survival machinery shows promise for overcoming the clinical radiochemotherapy resistance of B-precursor ALL cells.
    No preview · Article · Jun 2014 · Integrative Biology
  • D Murphy · P Kashal · G.P. Quinn · K.K. Sawczyn · A.M. Termuhlen
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    ABSTRACT: Education materials detailing fertility preservation options geared towards pediatric oncology patients are inadequately available, particularly materials that are culturally tailored. An English language pediatric fertility preservation brochure was developed in 2011, and given the significance of family building among Hispanics, it is important to transcreate materials for these audiences using learner verification to explore the unique preferences of the population. Qualitative face-to-face interviews and focus groups. Spanish-speaking patients (n = 10), parents (n = 10), and healthcare providers (n = 5). Suggestions for revisions were tested with focus groups of the same population (N = 16). Design, readability, likelihood to read, and overall opinion. Feedback was organized into 2 distinct themes: design and reader action. Overall the majority of parents and patients wanted personal accounts of other patients who had undergone fertility preservation, as well as photos of actual patients. The medical terminology in the brochure was acceptable and understood by most. The majority of participants who preferred the design with vivid colors and patterns explained this was because that brochure also contained more relevant information; however, both brochures had identical information. Many participants explained they would be receptive to receiving the brochure and the reproductive health information should be reinforced throughout cancer care. A learner verification approach to create pediatric educational materials can judiciously identify unique preferences for information. These results will be utilized to educate Spanish-speaking pediatric oncology patients and their parents to improve decision-making processes regarding future parenthood.
    No preview · Article · Apr 2014 · Journal of pediatric and adolescent gynecology

  • No preview · Article · Dec 2013 · American Journal of Hematology
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    ABSTRACT: We examined the constitutive function of the Ikaros (IK) transcription factor in blast cells from pediatric B-precursor acute lymphoblastic leukemia (BPL) patients using multiple assay platforms and bioinformatics tools. We found no evidence of diminished IK expression or function for primary cells from high-risk BPL patients including a Philadelphia chromosome (Ph)(+) subset. Relapse clones as well as very aggressive in vivo clonogenic leukemic B-cell precursors isolated from spleens of xenografted NOD/SCID mice that developed overt leukemia after inoculation with primary leukemic cells of patients with BPL invariably and abundantly expressed intact IK protein. These results demonstrate that a lost or diminished IK function is not a characteristic feature of leukemic cells in Ph(+) or Ph(-) high-risk BPL.
    Full-text · Article · Nov 2013 · PLoS ONE
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    ABSTRACT: Reproductive health among cancer survivors is an important quality of life issue. Certain cancer therapies have known fertility risks. There is an existing cohort of adolescents and young adults (AYA) cancer survivors that, seen less frequently in clinical care settings than active patients, are likely not having discussions of fertility and other reproductive health issues. A survivor or healthcare provider can easily assume that the window of opportunity for fertility preservation has passed, however emerging research has shown this may not be the case. Recent data demonstrates a close relationship between fertility and other late effects to conclude that ongoing assessment during survivorship is warranted. Some fertility preservation procedures have also been shown to mitigate common late effects. This review explores the link between late effects from treatment and common comorbidities from infertility, which may exacerbate these late effects. This review also highlights the relevance of fertility discussions in the AYA survivorship population.
    Full-text · Article · Oct 2013 · Frontiers in Oncology
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    ABSTRACT: The extended major histocompatibility complex (xMHC) is the most gene-dense region of the genome and harbors a disproportionately large number of genes involved in immune function. The postulated role of infection in the causation of childhood B-cell precursor acute lymphoblastic leukemia (BCP-ALL) suggests that the xMHC may make an important contribution to the risk of this disease. We conducted association mapping across an approximately 4 megabase region of the xMHC using a validated panel of single nucleotide polymorphisms (SNPs) in childhood BCP-ALL cases (n=567) enrolled in the Northern California Childhood Leukemia Study (NCCLS) compared with population controls (n=892). Logistic regression analyses of 1,145 SNPs, adjusted for age, sex, and Hispanic ethnicity indicated potential associations between several SNPs and childhood BCP-ALL. After accounting for multiple comparisons, one of these included a statistically significant increased risk associated with rs9296068 (OR=1.40, 95% CI=1.19-1.66, corrected p=0.036), located in proximity to HLA-DOA. Sliding window haplotype analysis identified an additional locus located in the extended class I region in proximity to TRIM27 tagged by a haplotype comprising rs1237485, rs3118361, and rs2032502 (corrected global p=0.046). Our findings suggest that susceptibility to childhood BCP-ALL is influenced by genetic variation within the xMHC and indicate at least two important regions for future evaluation.
    Full-text · Article · Aug 2013 · PLoS ONE
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    ABSTRACT: Administrative data sets are increasingly being used to describe clinical care in sickle cell disease (SCD). We recently used such an administrative database to look at the frequency of acute chest syndrome (ACS) and the use of transfusion to treat this syndrome in California patients from 2005 to 2010. Our results revealed a surprisingly low rate of transfusion for this life-threatening situation. To validate these results, we compared California OSPHD (Office of Statewide Health Planning and Development) administrative data with medical record review of patients diagnosed with ACS identified by two pediatric and one adult hospital databases during 2009-2010. ACS or a related pulmonary process accounted for one-fifth of the inpatient hospital discharges associated with the diagnosis of SCD between 2005 and 2010. Only 47% of those discharges were associated with a transfusion. However, chart reviews found that hospital databases over-reported visits for ACS. OSHPD underreported transfusions compared to hospital data. The net effect was a markedly higher true rate of transfusion (40.7% vs. 70.2%). These results point out the difficulties in using this administrative data base to describe clinical care for ACS given the variation in clinician recognition of this entity. OSPHD is widely used to inform health care policy in California and contributes to national databases. Our study suggests that using this administrative database to assess clinical care for SCD may lead to inaccurate assumptions about quality of care for SCD patients in California. Future studies on health services in SCD may require a different methodology. Pediatr Blood Cancer © 2013 Wiley Periodicals, Inc.
    No preview · Article · Aug 2013 · Pediatric Blood & Cancer
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    ABSTRACT: The Children's Oncology Group's A5971 trial examined central nervous system (CNS) prophylaxis and early intensification in paediatric patients diagnosed with CNS-negative Stage III and IV lymphoblastic lymphoma. Using a 2 × 2 factorial design, the study randomized patients to Children's Cancer Group (CCG) modified Berlin-Frankfurt-Muenster (BFM) acute lymphoblastic leukaemia (ALL) regimen with intensified intrathecal (IT) methotrexate (MTX) (Arm A1) or an adapted non-Hodgkin lymphoma/BFM-95 therapy with high dose MTX in interim maintenance but no IT-MTX in maintenance (Arm B1). Each cohort was randomized ± intensification (cyclophosphamide/anthracycline) (Arms A2/B2). For the 254 randomized patients, there was no difference in 5-year event-free survival (EFS) for the four arms: Arm A1, 80% [95% confidence interval (CI) 67-89%] and Arm A2, 81% (95% CI 69-89%); Arm B1, 80% (95% CI 68-88%) and Arm B2, 84% (95% CI 72-91%). The cumulative incidence of CNS relapse was 1·2%. Age <10 years and institutional imaging response at 2 weeks was associated with improved outcomes (P < 0·001 and P = 0·014 for overall survival). CNS positive patients (n = 12) did poorly [5-year EFS of 63% (95% CI 29-85%)]. For CNS-negative patients, there was no difference in outcome based on CNS prophylaxis (IT-MTX versus HD-MTX) or with intensification.
    No preview · Article · Jul 2013 · British Journal of Haematology
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    ABSTRACT: We report preclinical proof of principle for effective treatment of B-precursor acute lymphoblastic leukemia (ALL) by targeting the spleen tyrosine kinase (SYK)-dependent antiapoptotic blast cell survival machinery with a unique nanoscale pharmaceutical composition. This nanoscale liposomal formulation (NLF) contains the pentapeptide mimic 1,4-Bis (9-O dihydroquinidinyl) phthalazine/hydroquinidine 1,4-phathalazinediyl diether (C61) as the first and only selective inhibitor of the substrate binding P-site of SYK. The C61 NLF exhibited a very favorable pharmacokinetic and safety profile in mice, induced apoptosis in primary B-precursor ALL blast cells taken directly from patients as well as in vivo clonogenic ALL xenograft cells, destroyed the in vivo clonogenic fraction of ALL blast cells, and, at nontoxic dose levels, exhibited potent in vivo antileukemic activity against patient-derived ALL cells in xenograft models of aggressive B-precursor ALL. Our findings establish SYK as an attractive molecular target for therapy of B-precursor ALL. Further development of the C61 NLF may provide the foundation for therapeutic innovation against therapy-refractory B-precursor ALL.
    Full-text · Article · Apr 2013 · Blood
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    Full-text · Dataset · Apr 2013
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    ABSTRACT: Localized lymphoblastic lymphoma (LL) is rare in pediatric patients. We report the 5-year event-free survival (EFS) and overall survival (OS) for children and adolescents with localized LL treated on a uniform regimen based on Children's Cancer Group (CCG) leukemia therapy (COG A5971). From June 2000 to October 2005, the study enrolled 60 patients >12 months old with Murphy stages I or II LL. Central review confirmed 56 eligible patients. Treatment consisted of 24 months of CCG BFM without day 28 intrathecal methotrexate in maintenance therapy or prophylactic cranial radiation. Most patients had pre-B immunophenotype (75%). At a median follow-up of 5.9 years (range 1.4-9.3 years), the 5-year EFS was 90% [95% confidence interval (CI), 78-96%] and the 5-year OS was 96% (95% CI, 84-99%). Stage (I vs. II), immunophenotype, elevated LDH > institutional normal, or primary site did not impact outcome. Five relapses occurred-none in the CNS and none in patients with pre-T lymphoblastic disease. Patients tolerated treatment well with no toxic deaths. Outcomes of pediatric patients with localized LL treated with 2 years of intensive acute lymphoblastic leukemia (ALL)-type therapy was excellent and is similar to the outcome for standard risk ALL treated less intensively. CNS prophylaxis was adequate with limited intrathecal methotrexate and no radiation. Future studies should identify biologic prognostic factors or biomarkers for pediatric patients with LL, explore less intensive treatment for patients with localized disease, and explore novel immunophenotype directed therapies. Pediatr Blood Cancer 2012; 59: 1229-1233. © 2012 Wiley Periodicals, Inc.
    No preview · Article · Dec 2012 · Pediatric Blood & Cancer
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    ABSTRACT: MS and endocrine dysfunction(s) are common well-recognized complications after HSCT. We retrospectively analyzed our data on 160 patients with a median age at transplant of five yr (0.3-23), who had been followed for a median of seven yr (range 3-18) at Nationwide Children's Hospital after transplant. Dyslipidemia and MS were seen in 13% and 7.5% patients, respectively, and 58% of these patients were <20 yr of age. Twelve patients met the criteria for diagnosis of MS, but four of these did not meet the International Diabetic Federation or WHO criteria. Variation in the diagnostic criteria for MS leading to underdiagnosis is discussed. Female gonadal failure (27%) and hypothyroidism (21%) were the most common endocrine dysfunctions, followed by short stature and GH deficiency (17%) each. TBI and younger age at HSCT were associated with the highest burden of long-term effects, and female sex was more significantly associated with MS-related dysfunction (p < 0.05). Uniform diagnostic criteria for MS and close follow-up after transplant are important for the early diagnosis and management of these late effects, thereby improving the overall quality of life of these patients.
    No preview · Article · Dec 2012 · Pediatric Transplantation
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    ABSTRACT: Background: Sickle Cell Disease (SCD) affects 100,000 individuals in the United States. Advances in care have resulted in a growing population of adults with SCD. Without a parallel increase in the capacity to care for this group of patients, inequities have emerged in access to quality care and health outcomes. Most adult patients are hospitalized outside of SCD centers. Increased mortality in young adults following transition from pediatrics is often due to Acute Chest Syndrome (ACS), a life-threatening pulmonary process usually requiring blood transfusion. Recognition and appropriate treatment of ACS could represent a key indicator of care and promote wellness for adult SCD patients. Our recent query of the California Office of Statewide Health Planning and Development (OSPHD) database found that one-fifth of the hospital inpatient visits associated with the diagnosis of SCD between 2005 and 2008 were for ACS or a related pulmonary process. Despite NIH standard of care guidelines suggesting that transfusion should be used to treat ACS, we found that only 46% of those visits were associated with a transfusion, implying many patients are not receiving appropriate care. Administrative data allows researchers to access large populations but has not been validated for SCD. In light of recognized concerns regarding the relationship of coded diagnoses in administrative data to final clinical diagnoses, we compared OSHPD visit-level discharge data to three hospital databases. Methods: Hospital billing data from 2009-10 identified patients as having ACS. Equal numbers of cases were reported to OSHPD during the same time period. Primary and all secondary diagnoses were reviewed in administrative data. Chart reviews were conducted of identified cases. Results: Chart review identified a higher number of ACS visits in hospital data in light of cases in which ACS was investigated but not proven. More transfusions were identified in hospital data than OSHPD. The net effect was a lower transfusion rate in OSHPD (52.3% Hospital 1; 12.9% Hospital 2; 22.7% Hospital 3) than actual transfusion rate (77% Hospital 1; 50% Hospital 2; 50% Hospital 3). Conclusions: Administrative data is widely used to inform health policy, with OSPHD in particular widely used in California. However, these results suggest that using administrative data to assess clinical care for SCD may lead to inaccurate assumptions about quality of care, thus leading to continuous disparities in health care services.
    No preview · Conference Paper · Oct 2012
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    ABSTRACT: Reproductive health consistently ranks as one of the most important issues cited by adolescent and young adult (AYA) cancer survivors. Most literature on AYA cancer populations neglects broader reproductive health issues such as unintended pregnancies, contraception use and sexually transmitted infections, which, for cancer patients and survivors with compromised immune systems, can facilitate a multitude of future health problems. Lack of attention coupled with traditional risk-taking behaviors of AYAs poses a significant health risk to patients and survivors, particularly if fertility status is unknown or inaccurately assessed. AYA oncology patients and survivors are vulnerable to reproductive health complications that should be addressed prior to, during and after treatment; however, there are currently no tracking systems or evidence-based guidelines to discuss this subject with patients and survivors. Further research is needed to identify physician practices, AYA preferences and strategies for communication that can pave the way to establishing guidelines to discuss in oncology settings.
    Full-text · Article · Oct 2012 · Contraception
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    ABSTRACT: Anti-seizure prophylaxis is routinely utilized during busulfan administration for HSCT. We evaluated the feasibility and efficacy of levetiracetam in children undergoing HSCT. A total of 28 children and young adults received levetiracetam during HSCT and the outcomes and costs were compared to a historical, but similar cohort of 25 patients who had received fosphenytoin. Levetiracetam was well tolerated and was efficacious in preventing seizures. Cost of drug, administration, and monitoring were also similar among the two groups. Due to non-induction of the hepatic cytochrome P450 enzymes, levetiracetam may lead to better dose assurance of busulfan in targeted dose regimens for HSCT.
    No preview · Article · Oct 2012 · Pediatric Blood & Cancer
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    M Skeens · V Pai · A Garee · A M Termuhlen · R P S Bajwa · T G Gross · S Soni
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    ABSTRACT: Tacrolimus is routinely administered for GVHD prophylaxis as a 24-h continuous infusion that requires a dedicated i.v. line and thus becomes logistically difficult to administer, especially in young pediatric patients. We investigated the safety and efficacy of twice daily bolus infusions of i.v. tacrolimus in 33 children undergoing hematopoietic stem cell transplantation (HSCT) at our institution. Tacrolimus was started at an initial dose of 0.015 mg/kg i.v. bolus administered as a 2-h infusion and then given at every 12 h to maintain a trough drug level between 5-15 ng/mL. Patients also received short-course MTX (66%) or mycophenolate mofetil (34%) in combination with tacrolimus. No acute infusional toxicities were observed with bolus infusions of i.v. tacrolimus. Nephrotoxicity occurred in 14/33 (42%) patients and 48% developed hypertension (HT). Almost all (94%) patients required magnesium supplements to maintain magnesium (Mg) levels 1.5 mg/dL. In all, 3 (9%) patients developed severe sinusoidal obstruction syndrome (SOS). One patient developed posterior reversible leuko-encephalopathy syndrome (PRES) and one additional patient had tremors. The prevelance of these side-effects was similar to those reported for continuous i.v. administration. In all, 28% of the evaluable patients developed acute GVHDgrade II, though the incidence of severe (grade III-IV) GVHD was only 7%. These results suggest that intermittent bolus i.v. tacrolimus administration is a safe and effective method of GVHD prophylaxis in children.Bone Marrow Transplantation advance online publication, 9 April 2012; doi:10.1038/bmt.2012.59.
    Full-text · Article · Apr 2012 · Bone marrow transplantation

Publication Stats

589 Citations
181.06 Total Impact Points

Institutions

  • 2016
    • Keck School of Medicine USC
      Los Ángeles, California, United States
  • 2015
    • University of California, San Francisco
      San Francisco, California, United States
  • 2001-2015
    • University of Southern California
      • • Keck School of Medicine
      • • Department of Pediatrics
      Los Ángeles, California, United States
  • 2013
    • University of California, Los Angeles
      • Department of Pediatrics
      Los Ángeles, California, United States
  • 2011-2012
    • California State University, Long Beach
      Long Beach, California, United States
  • 2009-2012
    • Nationwide Children's Hospital
      • Center for Childhood Cancer and Blood Diseases
      Columbus, Ohio, United States
  • 2003-2012
    • The Ohio State University
      • Department of Pediatrics
      Columbus, Ohio, United States
  • 2008
    • Columbus Community Hospital, Inc.
      Columbus, Nebraska, United States
    • Childrens Hospital of Pittsburgh
      Pittsburgh, Pennsylvania, United States
  • 2007
    • Wolfson Childrens Hospital
      Jacksonville, Florida, United States