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Warmke LM, Collier CD, Niziolek PJ, Davis JL, Zou YS, Michal M, Bell RC, Policarpio-Nicolas MLC, Cheng YW, Duckworth L, Dermawan JK, Fritchie KJ, Dehner CA. Novel CRTC1::MRTFB(MKL2) Gene Fusion detected in Myxoid Mesenchymal Neoplasms with Myogenic Differentiation involving Bone and Soft Tissue. Mod Pathol 2024:100518. [PMID: 38763420 DOI: 10.1016/j.modpat.2024.100518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 03/15/2024] [Revised: 04/23/2024] [Accepted: 05/11/2024] [Indexed: 05/21/2024]
Abstract
Appropriate classification of fusion-driven bone and soft tissue neoplasms continues to evolve, often relying on the careful integration of morphologic findings with immunohistochemical, molecular, and clinical data. Herein, we present three cases of a morphologically distinct myxoid mesenchymal neoplasm with myogenic differentiation and novel CRTC1::MRTFB (formerly MKL2) gene fusion. Three tumors occurred in 2 female and 1 male patient with a median age of 72 (range: 28-78). Tumors involved the left iliac bone, the right thigh, and the left perianal region with a median size of 4.0 cm (4.0-7.6 cm). While one tumor presented as an incidental finding, the other two tumors were noted given their persistent growth. At the time of last follow-up, one patient was alive with unresected disease at 6 months, one patient was alive without evidence of disease at 12 months after surgery and one patient died of disease 24 months after diagnosis. On histologic sections, the tumors showed multinodular growth and were composed of variably cellular spindle to round-shaped cells with distinct brightly eosinophilic cytoplasm embedded within a myxoid stroma. One tumor showed overt smooth muscle differentiation. Cytologic atypia and mitotic activity ranged from minimal (2 cases) to high (1 case). By immunohistochemistry, the neoplastic cells expressed focal smooth muscle actin, h-caldesmon, and desmin in all tested cases. Skeletal muscle markers were negative. Next-generation sequencing detected nearly identical CRTC1::MRTFB gene fusions in all cases. We suggest that myxoid mesenchymal tumors with myogenic differentiation harboring a CRTC1::MRTFB fusion may represent a previously unrecognized, distinctive entity that involves soft tissue and bone. Continued identification of these novel myxoid neoplasms with myogenic differentiation will be important in determining appropriate classification, understanding biologic potential, and creating treatment paradigms.
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Affiliation(s)
- Laura M Warmke
- Department of Pathology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Christopher D Collier
- Department of Orthopedic Surgery, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Paul J Niziolek
- Department of Radiology and Imaging Sciences, Musculoskeletal Imaging, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Jessica L Davis
- Department of Pathology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Ying S Zou
- Department of Pathology, The Johns Hopkins Hospital, Baltimore, MD, USA
| | | | - Robert C Bell
- Department of Pathology, Michigan University, Ann Arbor, MI, USA
| | | | - Yu-Wei Cheng
- Department of Pathology and Laboratory Medicine, Cleveland Clinic, Cleveland, OH, USA
| | - Lauren Duckworth
- Department of Pathology and Laboratory Medicine, Cleveland Clinic, Cleveland, OH, USA
| | - Josephine K Dermawan
- Department of Pathology and Laboratory Medicine, Cleveland Clinic, Cleveland, OH, USA
| | - Karen J Fritchie
- Department of Pathology and Laboratory Medicine, Cleveland Clinic, Cleveland, OH, USA
| | - Carina A Dehner
- Department of Pathology, Indiana University School of Medicine, Indianapolis, IN, USA.
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Warmke LM, Collier CD, Davis JL. NR1D1::MAML1 epithelioid and spindle cell sarcoma mimicking pseudomyogenic hemangioendothelioma in core biopsy: A case report and review of the literature. Genes Chromosomes Cancer 2023; 62:655-662. [PMID: 37326138 DOI: 10.1002/gcc.23186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 06/06/2023] [Accepted: 06/07/2023] [Indexed: 06/17/2023] Open
Abstract
Epithelioid and spindle cell sarcomas with NR1D1::MAML1/2 gene fusions are rare and emerging entities. Only six cases of NR1D1-rearranged mesenchymal tumors have previously been reported in the literature; they are often characterized by an epithelioid morphology, at least focal pseudogland formation, prominent cytoplasmic vacuoles, and focal to diffuse immunohistochemical expression of keratin. We herein report the first case of an NR1D1::MAML1 epithelioid and spindle cell sarcoma with dual immunohistochemical expression of ERG and FOSB, mimicking a pseudomyogenic hemangioendothelioma (PHE) on core biopsy. The sarcoma arose in the left forearm of a 64-year-old man. Initial biopsy showed a mesenchymal neoplasm composed of epithelioid and spindle cells dispersed in myxoid stroma with scattered stromal neutrophils. The morphologic features, combined with the dual immunohistochemical expression of ERG and FOSB, initially mimicked PHE, representing an important potential diagnostic pitfall. The patient subsequently underwent a radical resection, which showed a much more diffuse epithelioid appearance with nested architecture and pseudogland formation. Next-generation sequencing was performed on the resection specimen, which revealed an NR1D1::MAML1 gene fusion, confirming the final diagnosis. Given the fully malignant potential of this tumor, knowledge and recognition of this rare entity are essential to ensure proper management, prevent misdiagnosis, and further characterize the clinical course of this emerging entity. Comprehensive molecular testing can help to identify these rare tumors and exclude the possibility of epithelioid mimics, including PHE.
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Affiliation(s)
- Laura M Warmke
- Department of Pathology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Christopher D Collier
- Department of Orthopedic Surgery, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Jessica L Davis
- Department of Pathology, Indiana University School of Medicine, Indianapolis, Indiana, USA
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Blackburn CW, Richardson SM, DeVita RR, Dong O, Faraji N, Wurtz LD, Collier CD, Getty PJ. What Is the Prevalence of Clinically Important Findings Among Incidentally Found Osseous Lesions? Clin Orthop Relat Res 2023; 481:1993-2002. [PMID: 36975798 PMCID: PMC10499109 DOI: 10.1097/corr.0000000000002630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 01/31/2023] [Accepted: 02/28/2023] [Indexed: 03/29/2023]
Abstract
BACKGROUND Patients with incidentally found musculoskeletal lesions are regularly referred to orthopaedic oncology. Most orthopaedic oncologists understand that many incidental findings are nonaggressive and can be managed nonoperatively. However, the prevalence of clinically important lesions (defined as those indicated for biopsy or treatment, and those found to be malignant) remains unknown. Missing clinically important lesions can result in harm to patients, but needless surveillance may exacerbate patient anxiety about their diagnosis and accrue low-value costs to the payor. QUESTIONS/PURPOSES (1) What percentage of patients with incidentally discovered osseous lesions referred to orthopaedic oncology had lesions that were clinically important, defined as those receiving biopsy or treatment or those found to be malignant? (2) Using standardized Medicare reimbursements as a surrogate for payor expense, what is the value of reimbursements accruing to the hospital system for the imaging of incidentally found osseous lesions performed during the initial workup period and during the surveillance period, if indicated? METHODS This was a retrospective study of patients referred to orthopaedic oncology for incidentally found osseous lesions at two large academic hospital systems. Medical records were queried for the word "incidental," and matches were confirmed by manual review. Patients evaluated at Indiana University Health between January 1, 2014, and December 31, 2020, and those evaluated at University Hospitals between January 1, 2017, and December 31, 2020, were included. All patients were evaluated and treated by the two senior authors of this study and no others were included. Our search identified 625 patients. Sixteen percent (97 of 625) of patients were excluded because their lesions were not incidentally found, and 12% (78 of 625) were excluded because the incidental findings were not bone lesions. Another 4% (24 of 625) were excluded because they had received workup or treatment by an outside orthopaedic oncologist, and 2% (10 of 625) were excluded for missing information. A total of 416 patients were available for preliminary analysis. Among these patients, 33% (136 of 416) were indicated for surveillance. The primary indication for surveillance included lesions with a benign appearance on imaging and low clinical suspicion of malignancy or fracture. A total of 33% (45 of 136) of these patients had less than 12 months of follow-up and were excluded from further analysis. No minimum follow-up criteria were applied to patients not indicated for surveillance because this would artificially inflate our estimated rate of clinically important findings. A total of 371 patients were included in the final study group. Notes from all clinical encounters with orthopaedic and nonorthopaedic providers were screened for our endpoints (biopsy, treatment, or malignancy). Indications for biopsy included lesions with aggressive features, lesions with nonspecific imaging characteristics and a clinical picture concerning for malignancy, and lesion changes seen on imaging during the surveillance period. Indications for treatment included lesions with increased risk of fracture or deformity, certain malignancies, and pathologic fracture. Diagnoses were determined using biopsy results if available or the documented opinion of the consulting orthopaedic oncologist. Imaging reimbursements were obtained from the Medicare Physician Fee Schedule for 2022. Because imaging charges vary across institutions and reimbursements vary across payors, this method was chosen to enhance the comparability of our findings across multiple health systems and studies. RESULTS Seven percent (26 of 371) of incidental findings were determined to be clinically important, as previously defined. Five percent (20 of 371) of lesions underwent tissue biopsy, and 2% (eight of 371) received surgical intervention. Fewer than 2% (six of 371) of lesions were malignant. Serial imaging changed the treatment of 1% (two of 136) of the patients, corresponding to a rate of one in 47 person-years. Median reimbursements to work up the incidental findings analyzed was USD 219 (interquartile range USD 0 to 404), with a range of USD 0 to 890. Among patients indicated for surveillance, the median annual reimbursement was USD 78 (IQR USD 0 to 389), with a range of USD 0 to 2706. CONCLUSION The prevalence of clinically important findings among patients referred to orthopaedic oncology for incidentally found osseous lesions is modest. The likelihood of surveillance resulting in a change of management was low, but the median reimbursements associated with following these lesions was also low. We conclude that after appropriate risk stratification by orthopaedic oncology, incidental lesions are rarely clinically important, and judicious follow-up with serial imaging can be performed without incurring high costs. LEVEL OF EVIDENCE Level III, therapeutic study.
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Affiliation(s)
- Collin W. Blackburn
- Department of Orthopaedic Surgery, University Hospitals Cleveland Medical Center, Cleveland, OH, USA
| | - Spencer M. Richardson
- Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Robert R. DeVita
- Department of Radiology, Wake Forest Baptist Medical Center, Winston-Salem, NC, USA
| | - Oliver Dong
- Case Western Reserve University School of Medicine, Cleveland, OH, USA
| | - Navid Faraji
- Department of Radiology, University Hospitals Cleveland Medical Center, Cleveland, OH, USA
| | - L. Daniel Wurtz
- Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Christopher D. Collier
- Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Patrick J. Getty
- Department of Orthopaedic Surgery, University Hospitals Cleveland Medical Center, Cleveland, OH, USA
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Richardson SM, Wurtz LD, Collier CD. Ninety Percent or Greater Tumor Necrosis Is Associated With Survival and Social Determinants of Health in Patients With Osteosarcoma in the National Cancer Database. Clin Orthop Relat Res 2023; 481:512-522. [PMID: 36099400 PMCID: PMC9928876 DOI: 10.1097/corr.0000000000002380] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Accepted: 08/04/2022] [Indexed: 01/31/2023]
Abstract
BACKGROUND The histologic response of osteosarcoma to chemotherapy is commonly cited as a prognostic factor and typically graded as the percent necrosis of the tumor at the time of surgical resection. Few studies, to our knowledge, have examined the relationship of tumor necrosis relative to other factors. Existing studies are limited by prolonged enrollment periods or analysis of patient subsets without the strongest predictor of mortality: metastasis at diagnosis. Additionally, the definitive threshold value for a good histologic response is commonly set at more than 90% tumor necrosis with little evidence; some authors advocate other values. QUESTION/PURPOSES (1) Are there alternative cutoff values for a good response to chemotherapy in a large, national cohort of contemporarily treated patients with osteosarcoma? (2) How does the association of histologic response to survival in osteosarcoma compare with other clinicopathologic factors? (3) What patient and clinical factors are associated with the histologic response? METHODS We identified 2006 patients with osteosarcoma diagnosed between 2010 and 2015 in the National Cancer Database (NCDB), a registry that includes 70% of all new cancers diagnosed in the United States with 90% follow-up. Patients were excluded for missing documentation of percent tumor necrosis (21% [425 of 2006]) or if definitive resection was not performed (< 1% [1 of 2006]). A total of 1580 patients were included in the analysis, with a mean follow-up duration of 37 ± 22 months. A Kaplan-Meier survival analysis, stratified by the percent tumor necrosis after chemotherapy, was performed for the 5-year period. Other covariates examined were sex, race, socioeconomic score composite, insurance type, Charlson/Deyo score, distance from the hospital, and location (metropolitan, urban, or rural). Clinical and sociodemographic data including patient-identified race from the patient's medical record is input into the NCDB by certified registrars. The NCDB only allows coding of one primary race for each patient; thus, most of our patients were grouped as White or Black race and the remaining were grouped as Other for our analysis. A multiple Cox regression analysis was performed to evaluate the effect of percent necrosis compared with other demographic, clinicopathologic, and treatment effects on survival. Finally, a multiple logistic regression analysis was performed to assess demographic and clinicopathologic characteristics associated with percent necrosis. RESULTS Five-year overall survival for patients with histologic gradings of 90% to 94% necrosis (70% [95% confidence interval (CI) 60.6% to 79.7%) and 95% to 100% necrosis (74% [95% CI 68% to 80.3%) was not different between groups (p = 0.47). A comparison of histologic responses below 90% necrosis found no difference in survival between patients with decreasing histologic response (p > 0.05). Necrosis of less than 90% was associated with worse survival (HR 2.00 [95% CI 1.58 to 2.52]; p < 0.001 compared with more than 90% necrosis), and factors most associated with poor survival were metastasis (HR 2.85 [95% CI 2.27 to 3.59]; p < 0.001) and skip metastasis at the time of diagnosis (HR 2.52 [95% CI 1.64 to 3.88]; p < 0.001). On multivariate analysis, adjusting for demographic, clinicopathologic, and treatment factors, social determinants of health were negatively associated with percent necrosis of 90% or more, including uninsured status (OR 0.46 [95% CI 0.23 to 0.92]; p = 0.02 compared with private insurance) and lower socioeconomic status composite (OR for the lowest first and second quartiles were 0.63 [95% CI 0.44 to 0.90]; p = 0.01 and 0.70 [95% CI 0.50 to 0.96]; p = 0.03, respectively). Race other than White or Black (OR 0.61 [95% CI 0.40 to 0.94]; p = 0.02 compared with White race) was also negatively associated with percent necrosis of more than 90% after controlling for available covariates. CONCLUSION This study suggests that a cutoff of 90% necrosis provides the best prognostic value for patients with osteosarcoma undergoing chemotherapy. Other threshold values did not show different survival benefits. Sociodemographic factors were associated with histologic response less than 90%. These associations must be carefully understood not as cause and effect but likely demonstrating the effects of health disparities and access to care. Although we controlled for multiple variables in our analysis, broad variables such as race may have been associated with histologic response due to unaccounted confounders. Medical providers should be aware of these associations to ensure equitable access and delivery of care because access to care may be responsible for these associations. Future studies should examine potential drivers of this observation, such as a delay in presentation or deviation from standard of care practices. LEVEL OF EVIDENCE Level III, therapeutic study.
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Affiliation(s)
- Spencer M. Richardson
- Department of Orthopaedic Surgery, Indiana University Health, Indiana University School of Medicine, Indianapolis, IN, USA
| | - L. Daniel Wurtz
- Department of Orthopaedic Surgery, Indiana University Health, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Christopher D. Collier
- Department of Orthopaedic Surgery, Indiana University Health, Indiana University School of Medicine, Indianapolis, IN, USA
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Poirier JL, Wurtz LD, Collier CD. Increased Number of Medical Comorbidities Associated With Increased Risk of Presenting With Pathological Femur Fracture in Metastatic Bone Disease. Iowa Orthop J 2023; 43:87-93. [PMID: 37383878 PMCID: PMC10296482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 06/30/2023]
Abstract
Background Many cancers metastasize to bone and may lead to pathologic fracture or impending pathologic fracture. Prophylactically stabilizing bones before fracture has been shown to be more cost-effective with improved outcomes. Many studies have examined risk factors for pathological fracture, with radiographic and functional pain data serving as predominant indicators for surgery. Conditions associated with poor bone health and increased risk of fracture in the non-oncologic population, including diabetes mellitus, chronic obstructive pulmonary disease (COPD), cardiovascular disease, renal disease, smoking, corticosteroid use, and osteoporosis, have not been studied in the context of metastatic disease. Characterization of these factors could help providers identify candidates for prophylactic stabilization thereby reducing the number of completed pathological fractures. Methods 298 patients over the age of 40 with metastatic bone disease of the femur treated between 2010-2021 were retrospectively identified. Patients without complete medical documentation or with non-metastatic diagnoses were excluded. 186 patients met inclusion and exclusion criteria, including 74 patients who presented with pathological femur fracture and 112 patients who presented for prophylactic stabilization. Patient demographics and comorbidities including diabetes mellitus, COPD, cardiovascular disease, renal disease, osteoporosis, active tobacco or corticosteroid use, and use of anti-resorptive therapy were collected. Descriptive statistics were compiled, with univariable analysis by Mann-Whitney or chisquared testing. Multiple logistic regression was then performed to identify the most significant patient variables for presenting with completed fracture. Results On univariable analysis, patients with COPD were more likely to present with pathologic fracture (19/32 [59%] compared to 55/154 [36%], p = 0.02). A trend emerged for patients with an increasing number of comorbidities (28/55 [51%] for 2+ comorbidities compared to 18/61 [29%] with zero comorbidities, p = 0.06). On multivariable analysis, patients with two or more comorbidities (OR: 2.49; p=0.02) were more likely to present with a femur fracture. Conclusion This analysis suggests that those with an increasing number of comorbidities may be at increased risk for pathologic fracture. This study raises the possibility that patient factors and/ or comorbidities alter bone strength and/or pain experiences and may guide orthopaedic oncologists weighing prophylactic stabilization of femur lesions. Level of Evidence: III.
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Affiliation(s)
- Jon-Luc Poirier
- Department of Orthopaedic Surgery, Indiana University Health, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - L. Daniel Wurtz
- Department of Orthopaedic Surgery, Indiana University Health, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Christopher D. Collier
- Department of Orthopaedic Surgery, Indiana University Health, Indiana University School of Medicine, Indianapolis, Indiana, USA
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Pandya PH, Jannu AJ, Bijangi-Vishehsaraei K, Dobrota E, Bailey BJ, Barghi F, Shannon HE, Riyahi N, Damayanti NP, Young C, Malko R, Justice R, Albright E, Sandusky GE, Wurtz LD, Collier CD, Marshall MS, Gallagher RI, Wulfkuhle JD, Petricoin EF, Coy K, Trowbridge M, Sinn AL, Renbarger JL, Ferguson MJ, Huang K, Zhang J, Saadatzadeh MR, Pollok KE. Integrative Multi-OMICs Identifies Therapeutic Response Biomarkers and Confirms Fidelity of Clinically Annotated, Serially Passaged Patient-Derived Xenografts Established from Primary and Metastatic Pediatric and AYA Solid Tumors. Cancers (Basel) 2022; 15:259. [PMID: 36612255 PMCID: PMC9818438 DOI: 10.3390/cancers15010259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 12/22/2022] [Accepted: 12/23/2022] [Indexed: 01/04/2023] Open
Abstract
Establishment of clinically annotated, molecularly characterized, patient-derived xenografts (PDXs) from treatment-naïve and pretreated patients provides a platform to test precision genomics-guided therapies. An integrated multi-OMICS pipeline was developed to identify cancer-associated pathways and evaluate stability of molecular signatures in a panel of pediatric and AYA PDXs following serial passaging in mice. Original solid tumor samples and their corresponding PDXs were evaluated by whole-genome sequencing, RNA-seq, immunoblotting, pathway enrichment analyses, and the drug−gene interaction database to identify as well as cross-validate actionable targets in patients with sarcomas or Wilms tumors. While some divergence between original tumor and the respective PDX was evident, majority of alterations were not functionally impactful, and oncogenic pathway activation was maintained following serial passaging. CDK4/6 and BETs were prioritized as biomarkers of therapeutic response in osteosarcoma PDXs with pertinent molecular signatures. Inhibition of CDK4/6 or BETs decreased osteosarcoma PDX growth (two-way ANOVA, p < 0.05) confirming mechanistic involvement in growth. Linking patient treatment history with molecular and efficacy data in PDX will provide a strong rationale for targeted therapy and improve our understanding of which therapy is most beneficial in patients at diagnosis and in those already exposed to therapy.
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Affiliation(s)
- Pankita H. Pandya
- Department of Pediatrics, Hematology/Oncology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Asha Jacob Jannu
- Department of Biostatistics & Health Data Science Indiana, University School of Medicine, Indianapolis, IN 46202, USA
| | - Khadijeh Bijangi-Vishehsaraei
- Department of Pediatrics, Hematology/Oncology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Erika Dobrota
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Barbara J. Bailey
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Farinaz Barghi
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Harlan E. Shannon
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Niknam Riyahi
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
- Department of Pharmacology and Toxicology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Nur P. Damayanti
- Department of Neurological Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Courtney Young
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Rada Malko
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Ryli Justice
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Eric Albright
- Department of Pathology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - George E. Sandusky
- Department of Pathology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - L. Daniel Wurtz
- Department of Orthopedics Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Christopher D. Collier
- Department of Orthopedics Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Mark S. Marshall
- Department of Pediatrics, Hematology/Oncology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Rosa I. Gallagher
- Center for Applied Proteomics and Molecular Medicine, Institute for Biomedical Innovation, George Mason University, Manassas, VA 20110, USA
| | - Julia D. Wulfkuhle
- Center for Applied Proteomics and Molecular Medicine, Institute for Biomedical Innovation, George Mason University, Manassas, VA 20110, USA
| | - Emanuel F. Petricoin
- Center for Applied Proteomics and Molecular Medicine, Institute for Biomedical Innovation, George Mason University, Manassas, VA 20110, USA
| | - Kathy Coy
- Preclinical Modeling and Therapeutics Core, Indiana University Melvin and Bren Simon Comprehensive Cancer Center, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Melissa Trowbridge
- Preclinical Modeling and Therapeutics Core, Indiana University Melvin and Bren Simon Comprehensive Cancer Center, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Anthony L. Sinn
- Preclinical Modeling and Therapeutics Core, Indiana University Melvin and Bren Simon Comprehensive Cancer Center, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Jamie L. Renbarger
- Department of Pediatrics, Hematology/Oncology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Michael J. Ferguson
- Department of Pediatrics, Hematology/Oncology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Kun Huang
- Department of Biostatistics & Health Data Science Indiana, University School of Medicine, Indianapolis, IN 46202, USA
| | - Jie Zhang
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - M. Reza Saadatzadeh
- Department of Pediatrics, Hematology/Oncology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Karen E. Pollok
- Department of Pediatrics, Hematology/Oncology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
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7
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Alentado VJ, Knox AM, Staut CA, McGuire AC, Chitwood JR, Mostardo SL, Shaikh MZ, Blosser RJ, Dadwal UC, Chu TMG, Collier CD, Li J, Liu Z, Kacena MA, Natoli RM. Validation of the modified radiographic union score for tibia fractures (mRUST) in murine femoral fractures. Front Endocrinol (Lausanne) 2022; 13:911058. [PMID: 35992150 PMCID: PMC9381990 DOI: 10.3389/fendo.2022.911058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 07/06/2022] [Indexed: 11/13/2022] Open
Abstract
Bony union is a primary predictor of outcome after surgical fixation of long bone fractures. Murine models offer many advantages in assessing bony healing due to their low costs and small size. However, current fracture recovery investigations in mice frequently rely on animal sacrifice and costly analyses. The modified Radiographic Union Score for Tibia fractures (mRUST) scoring system is a validated metric for evaluating bony healing in humans utilizing plain radiographs, which are relatively inexpensive and do not require animal sacrifice. However, its use has not been well established in murine models. The aim of this study was to characterize the longitudinal course of mRUST and compare mRUST to other conventional murine fracture analyses. 158 mice underwent surgically created midshaft femur fractures. Mice were evaluated after fracture creation and at 7, 10, 14, 17, 21, 24, 28, 35, and 42 days post-injury. mRUST scoring of plain radiographs was performed by three orthopaedic surgeons in a randomized, blinded fashion. Interrater correlations were calculated. Micro-computed tomography (μCT) was analyzed for tissue mineral density (TMD), total callus volume (TV), bone volume (BV), trabecular thickness, trabecular number, and trabecular separation. Histomorphometry measures of total callus area, cartilage area, fibrous tissue area, and bone area were performed in a blinded fashion. Ultimate torque, stiffness, toughness, and twist to failure were calculated from torque-twist curves. A sigmoidal log-logistic curve fit was generated for mRUST scores over time which shows mRUST scores of 4 to 6 at 7 days post-injury that improve to plateaus of 14 to 16 by 24 days post-injury. mRUST interrater correlations at each timepoint ranged from 0.51 to 0.86, indicating substantial agreement. mRUST scores correlated well with biomechanical, histomorphometry, and μCT parameters, such as ultimate torque (r=0.46, p<0.0001), manual stiffness (r=0.51, p<0.0001), bone percentage based on histomorphometry (r=0.86, p<0.0001), cartilage percentage (r=-0.87, p<0.0001), tissue mineral density (r=0.83, p<0.0001), BV/TV based on μCT (r=0.65, p<0.0001), and trabecular thickness (r=0.78, p<0.0001), among others. These data demonstrate that mRUST is reliable, trends temporally, and correlates to standard measures of murine fracture healing. Compared to other measures, mRUST is more cost-effective and non-terminal. The mRUST log-logistic curve could be used to characterize differences in fracture healing trajectory between experimental groups, enabling high-throughput analysis.
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Affiliation(s)
- Vincent J. Alentado
- Department of Neurological Surgery, School of Medicine, Indiana University, Indianapolis, IN, United States
| | - Adam M. Knox
- Department of Orthopaedic Surgery, School of Medicine, Indiana University, Indianapolis, IN, United States
| | - Caio A. Staut
- Department of Orthopaedic Surgery, School of Medicine, Indiana University, Indianapolis, IN, United States
| | - Anthony C. McGuire
- Department of Orthopaedic Surgery, School of Medicine, Indiana University, Indianapolis, IN, United States
| | - Joseph R. Chitwood
- Department of Orthopaedic Surgery, School of Medicine, Indiana University, Indianapolis, IN, United States
| | - Sarah L. Mostardo
- Department of Orthopaedic Surgery, School of Medicine, Indiana University, Indianapolis, IN, United States
| | - Mustufa Z. Shaikh
- Department of Orthopaedic Surgery, School of Medicine, Indiana University, Indianapolis, IN, United States
| | - Rachel J. Blosser
- Department of Orthopaedic Surgery, School of Medicine, Indiana University, Indianapolis, IN, United States
| | - Usashi C. Dadwal
- Department of Orthopaedic Surgery, School of Medicine, Indiana University, Indianapolis, IN, United States
| | - Tien-Min Gabriel Chu
- Department of Biomedical Sciences and Comprehensive Care, School of Dentistry, Indiana University, Indianapolis, IN, United States
| | - Christopher D. Collier
- Department of Orthopaedic Surgery, School of Medicine, Indiana University, Indianapolis, IN, United States
| | - Jiliang Li
- Department of Biology, Indiana University, Purdue University, Indianapolis, IN, United States
| | - Ziyue Liu
- Department of Biostatistics and Health Data Science, School of Public Health, Indiana University, Indianapolis, IN, United States
| | - Melissa A. Kacena
- Department of Orthopaedic Surgery, School of Medicine, Indiana University, Indianapolis, IN, United States
- Richard L. Roudebush VA Medical Center, Department of Veterans Affairs, Indianapolis, IN, United States
| | - Roman M. Natoli
- Department of Orthopaedic Surgery, School of Medicine, Indiana University, Indianapolis, IN, United States
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Knox AM, McGuire AC, Natoli RM, Kacena MA, Collier CD. Methodology, selection, and integration of fracture healing assessments in mice. J Orthop Res 2021; 39:2295-2309. [PMID: 34436797 PMCID: PMC8542592 DOI: 10.1002/jor.25172] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 08/02/2021] [Accepted: 08/13/2021] [Indexed: 02/04/2023]
Abstract
Long bone fractures are one of the most common and costly medical conditions encountered after trauma. Characterization of the biology of fracture healing and development of potential medical interventions generally involves animal models of fracture healing using varying genetic or treatment groups, then analyzing relative repair success via the synthesis of diverse assessment methodologies. Murine models are some of the most widely used given their low cost, wide variety of genetic variants, and rapid breeding and maturation. This review addresses key concerns regarding fracture repair investigations in mice and may serve as a guide in conducting and interpreting such studies. Specifically, this review details the procedures, highlights relevant parameters, and discusses special considerations for the selection and integration of the major modalities used for quantifying fracture repair in such studies, including X-ray, microcomputed tomography, histomorphometric, biomechanical, gene expression and biomarker analyses.
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Affiliation(s)
- Adam M. Knox
- Department of Orthopaedic Surgery, Indiana University School of Medicine, IN, USA
| | - Anthony C. McGuire
- Department of Orthopaedic Surgery, Indiana University School of Medicine, IN, USA
| | - Roman M. Natoli
- Department of Orthopaedic Surgery, Indiana University School of Medicine, IN, USA
| | - Melissa A. Kacena
- Department of Orthopaedic Surgery, Indiana University School of Medicine, IN, USA
- Richard L. Roudebush VA Medical Center, IN, USA
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9
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Collier CD, Nelson GB, Conry KT, Kosmas C, Getty PJ, Liu RW. The Natural History of Benign Bone Tumors of the Extremities in Asymptomatic Children: A Longitudinal Radiographic Study. J Bone Joint Surg Am 2021; 103:575-580. [PMID: 33646982 DOI: 10.2106/jbjs.20.00999] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND Benign bone tumors are common incidental findings in the pediatric population during radiographic evaluation. Counseling these patients requires reassurance and raises questions about the natural history of these tumors over time. The purpose of this study was to estimate the prevalence and observe the behavior of benign childhood bone tumors in an asymptomatic population. METHODS A historical, longitudinal radiographic collection of healthy children was reviewed, which included comprehensive left-sided radiographs of the extremities at yearly intervals. In this study, 262 subjects with 25,555 radiographs were screened for benign bone tumors at a median age of 8 years (range, 0 to 18 years). All potential tumors were reviewed by a multidisciplinary panel, which confirmed the radiographic diagnosis of each lesion, the age at which the lesion first appeared, and the age at which it had resolved. Prevalence rates were calculated using the number of distinct subjects available for each radiographic location and age. RESULTS Thirty-five tumors were identified in 33 subjects, including 19 nonossifying fibromas, 8 enostoses, 6 osteochondromas, and 2 enchondromas. The prevalence rate for all tumors combined increased with age and was 18.9% overall. The overall prevalence rates for specific tumor types were 7.5% for nonossifying fibromas, 5.2% for enostoses, 4.5% for osteochondromas, and 1.8% for enchondromas. Nonossifying fibromas demonstrated a bimodal distribution of prevalence, with a peak at 5 years (10.8%) and another after skeletal maturity (13.3%). The median age at the first appearance for all tumors combined was 9 years (range, 2 to 15 years), but varied by tumor type. Nonossifying fibromas often resolved (7 [37%] of 19), with further resolution possible beyond the last available radiograph. Enostoses, osteochondromas, and enchondromas persisted until the last available radiographs in all subjects. CONCLUSIONS The prevalence of benign childhood bone tumors of the extremities was 18.9% in a historical asymptomatic population. Longitudinal radiographs allowed observation of the timing of the first appearance and the potential for resolution for each tumor type. These findings provide unique evidence to answer many commonly encountered questions when counseling patients and their families on benign bone tumors. LEVEL OF EVIDENCE Prognostic Level IV. See Instructions for Authors for a complete description of levels of evidence.
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Affiliation(s)
- Christopher D Collier
- Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, Indiana
| | - Grant B Nelson
- Department of Orthopaedics, University Hospitals Rainbow Babies & Children's Hospital, Case Western Reserve University, Cleveland, Ohio
| | - Keegan T Conry
- Department of Orthopaedics, University Hospitals Rainbow Babies & Children's Hospital, Case Western Reserve University, Cleveland, Ohio
| | - Christos Kosmas
- Department of Radiology, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, Ohio
| | - Patrick J Getty
- Department of Orthopaedics, University Hospitals Rainbow Babies & Children's Hospital, Case Western Reserve University, Cleveland, Ohio
| | - Raymond W Liu
- Department of Orthopaedics, University Hospitals Rainbow Babies & Children's Hospital, Case Western Reserve University, Cleveland, Ohio
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10
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Collier CD, Quereshy HA, Getty PJ. Comparison of Publication Rates for Musculoskeletal Oncology Abstracts Presented at National Meetings. Sarcoma 2021; 2021:8326318. [PMID: 33746564 PMCID: PMC7960053 DOI: 10.1155/2021/8326318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 01/10/2021] [Accepted: 02/20/2021] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Scientific meetings provide a forum to disseminate new research and advance patient care. The American Academy of Orthopaedic Surgeons (AAOS), Connective Tissue Oncology Society (CTOS), and Musculoskeletal Tumor Society (MSTS) annual meetings are examples of such gatherings in the field of musculoskeletal oncology. After a review of select MSTS abstracts from 1991 to 1999 revealed a 41% publication rate in scientific journals, previous authors cautioned meeting attendees that the majority of abstracts may not survive rigorous peer review and may not be scientifically valid. Since two decades have passed, this study reexamined publication rates and characteristics in a contemporary and expanded cohort of oncology abstracts presented at the AAOS, CTOS, and MSTS annual meetings. METHODS 1408 podium and poster abstracts from the AAOS (oncology-focused from 2013 to 2015), CTOS (2012 to 2014), and MSTS (2012 to 2014) annual meetings were reviewed to allow for a four-year publication window. Searches were performed with PubMed and Google Scholar databases to identify full-text publications using abstract keywords. Characteristics of each abstract and resulting publication were collected. Statistical analysis was performed using the chi-square and Kruskal-Wallis tests for time-independent comparisons, and the log-rank test after reverse Kaplan-Meier analysis for time-dependent comparisons. RESULTS Abstract publication rates overall were higher for podium presentations (67%, 280 of 415) compared to poster presentations (53%, 530 of 993; p < 0.001). When both abstract types were combined, differences between meetings did not meet statistical significance (AAOS: 65%, 106 of 162; CTOS: 57%, 521 of 909; MSTS: 54%, 183 of 337, p=0.06). Abstracts from AAOS meetings were more often published prior to the first day of the meeting (AAOS: 24%, 25 of 106; CTOS: 10%, 52 of 521; MSTS: 14%, 25 of 183; p < 0.01). After excluding previously published abstracts, AAOS abstracts had the shortest time to publication (median: 10.8 months, interquartile range (IQR): 4.4 to 18.8 months), compared to those from CTOS (16.0 months, 8.4 to 25.9 months, p < 0.01) and MSTS (15 months, 7.9 to 25.0 months, p < 0.01) meetings. CTOS abstracts were published in higher impact journals (median: 3.7, IQR: 2.9 to 5.9), compared to those from AAOS (2.9, 1.9 to 3.2, p < 0.01) and MSTS (3.1, 2.3 to 3.1, p < 0.01) meetings. Finally, 7.7% (62 of 810) of published abstracts were presented at more than one meeting. CONCLUSIONS Publication rates in this study were higher than previous reports in musculoskeletal oncology and comparable or better than recent reports for other orthopedic meetings. Comparisons across the AAOS, CTOS, and MSTS annual meetings highlight notable differences but suggest similarity overall in the quality of evidence presented with little overlap between meetings. Taken together, this study points to progress in the review processes used by the program committees, reaffirms the importance of critical appraisal when considering abstract findings, and supports the continued organization of multiple scientific meetings in musculoskeletal oncology.
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Affiliation(s)
- Christopher D. Collier
- Department of Orthopaedic Surgery, Indiana University School of Medicine, 1130 W Michigan Street, Fesler Hall 115, Indianapolis, IN 46202, USA
| | - Humzah A. Quereshy
- Department of Orthopaedics, University Hospitals Cleveland Medical Center, Case Western Reserve University, 11100 Euclid Avenue, Cleveland, OH 44106, USA
| | - Patrick J. Getty
- Department of Orthopaedics, University Hospitals Cleveland Medical Center, Case Western Reserve University, 11100 Euclid Avenue, Cleveland, OH 44106, USA
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11
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Collier CD, Kim CY, Liu RW, Getty PJ. The Interval Between Preoperative Radiation and Surgery Is Not Associated with Overall Survival for Soft-tissue Sarcomas: An Analysis of the National Cancer Database. Clin Orthop Relat Res 2021; 479:506-517. [PMID: 32401002 PMCID: PMC7899587 DOI: 10.1097/corr.0000000000001287] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Accepted: 04/14/2020] [Indexed: 01/31/2023]
Abstract
BACKGROUND Most cancer centers prefer preoperative radiation therapy (preRT) over postoperative therapy to treat soft-tissue sarcoma (STS) to limit long-term fibrosis, joint stiffness, and edema. Surgery is often delayed after preRT to allow for tissue recovery and to reduce wound complications. However, the association between the time interval between preRT and surgery and survival is unknown. QUESTIONS/PURPOSES (1) What factors are associated with the preRT-surgery interval in patients with STS? (2) Is the preRT-surgery interval associated with overall survival? METHODS The National Cancer Database, a nationwide registry that includes 70% of all new cancers in the United States with 90% follow-up, was reviewed to identify 6378 patients who underwent preRT and surgical resection for a localized extremity or pelvic STS from 2004 to 2014. Patients were excluded if they had lymphatic or metastatic disease at diagnosis (23%; n = 1438), underwent neoadjuvant chemotherapy (24%; 1531), were missing vital status (8%; 487), had chemosensitive histologies (9%; 603), underwent radiation other than external beam (1%; 92), were missing preRT-surgery interval (1%; 45), or had a preRT-surgery interval greater than 120 days (< 1%; 6). A total of 2176 patients were included for analysis, with a mean preRT-surgery interval of 35 ± 16 days. A multiple linear regression model was generated to assess demographic, clinicopathologic, and treatment characteristics associated with the preRT-surgery interval. A Kaplan-Meier survival analysis was then conducted, stratified by the preRT-surgery interval, to assess survival over 10 years. Finally, a multivariate Cox regression analysis model was constructed to further evaluate the association between the preRT-surgery interval and overall survival, adjusted for demographic, clinicopathologic, and treatment characteristics. RESULTS A longer preRT-surgery interval was associated with higher age (β = 0.002 per year [95% CI 0.0 to 0.004]; p = 0.026), tumor location in the pelvis (compared with the lower extremity; β = 0.15 [95% CI 0.082 to 0.22]; p < 0.001), and malignant peripheral nerve sheath tumor subtype (compared with undifferentiated pleomorphic sarcoma; β = 0.17 [95% CI 0.044 to 0.29]; p = 0.008). A shorter preRT-surgery interval was associated with higher facility volume (β = -0.002 per case [95% CI -0.003 to -0.002]; p = 0.026) and higher tumor stage (compared with Stage I; β = -0.066 [95% CI -0.13 to -0.006]; p = 0.03 for Stage II; β = -0.12 [95% CI -0.17 to -0.065]; p < 0.001 for Stage III). The 5-year overall survival rates were similar across all preRT-surgery interval groups: less than 3 weeks (66% [95% CI 60 to 72]), 3 to 4 weeks (65% [95% CI 60 to 71]), 4 to 5 weeks (65% [95% CI 60 to 71]), 5 to 6 weeks (66% [95% CI 60 to 72]), 6 to 7 weeks (63% [95% CI 54 to 72]), 7 to 9 weeks (66% [95% CI 58 to 74]), and more than 9 weeks (59% [95% CI 48 to 69]). Over 10 years, no difference in overall survival was observed when stratified by the preRT-surgery interval (p = 0.74). After controlling for potentially confounding variables, including age, sex, Charlson/Deyo comorbidity score, histology, tumor size, stage and surgery type, the preRT-surgery interval was not associated with survival (hazard ratio = 1 per day [95% CI 1 to 1]; p = 0.88). CONCLUSION With the numbers available, this study demonstrates that a delay in surgery up to 120 days after radiation is not associated with poorer survival. Therefore, clinicians may be able to delay surgery to minimize the risks of wound complications and modifiable comorbidities without affecting overall survival.Level of Evidence Level III, therapeutic study.
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Affiliation(s)
- Christopher D Collier
- C. D. Collier, C.-Y. Kim, R. W. Liu, P. J. Getty, Department of Orthopaedics, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, OH, USA
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12
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Collier CD, Hausman BS, Zulqadar SH, Din ES, Anderson JM, Akkus O, Greenfield EM. Characterization of a reproducible model of fracture healing in mice using an open femoral osteotomy. Bone Rep 2020; 12:100250. [PMID: 32090156 PMCID: PMC7025178 DOI: 10.1016/j.bonr.2020.100250] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 01/26/2020] [Accepted: 02/03/2020] [Indexed: 01/03/2023] Open
Abstract
Purpose The classic fracture model, described by Bonnarens and Einhorn in 1984, enlists a blunt guillotine to generate a closed fracture in a pre-stabilized rodent femur. However, in less experienced hands, this technique yields considerable variability in fracture pattern and requires highly-specialized equipment. This study describes a reproducible and low-cost model of mouse fracture healing using an open femoral osteotomy. Methods Femur fractures were produced in skeletally mature male and female mice using an open femoral osteotomy after intramedullary stabilization. Mice were recovered for up to 28 days prior to analysis with microradiographs, histomorphometry, a novel μCT methodology, and biomechanical torsion testing at weekly intervals. Results Eight mice were excluded due to complications (8/193, 4.1%), including unacceptable fracture pattern (2/193, 1.0%). Microradiographs showed progression of the fracture site to mineralized callus by 14 days and remodelling 28 days after surgery. Histomorphometry from 14 to 28 days revealed decreased cartilage area and maintained bone area. μCT analysis demonstrated a reduction in mineral surface from 14 to 28 days, stable mineral volume, decreased strut number, and increased strut thickness. Torsion testing at 21 days showed that fractured femurs had 61% of the ultimate torque, 63% of the stiffness, and similar twist to failure when compared to unfractured contralateral femurs. Conclusions The fracture model described herein, an open femoral osteotomy, demonstrated healing comparable to that reported using closed techniques. This simple model could be used in future research with improved reliability and reduced costs compared to the current options. This study characterized a simple and reproducible model of fracture healing in mice using an open femoral osteotomy. Analysis by x-ray, histomorphometry, µCT, and biomechanical testing demonstrated healing comparable to current models. This simple model could be used to increase investigation into fracture healing, delayed union, and non-union.
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Affiliation(s)
- C D Collier
- Department of Orthopaedics, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, OH 44106, USA
| | - B S Hausman
- Department of Orthopaedics, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, OH 44106, USA
| | - S H Zulqadar
- Department of Orthopaedics, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, OH 44106, USA
| | - E S Din
- Department of Orthopaedics, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, OH 44106, USA
| | - J M Anderson
- Department of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA
| | - O Akkus
- Department of Orthopaedics, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, OH 44106, USA.,Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106, USA
| | - E M Greenfield
- Department of Orthopaedics, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, OH 44106, USA.,Department of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA
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13
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Abstract
UPDATE This article was updated on December 17, 2019, because a new reference was added post-publication. This new reference (Niemeier TE, Leddy LR, Chapin RW, Smith TM. Metachronous Aneurysmal Bone Cysts in a Fourteen-Year-Old Girl: A Case Report and Review of the Literature. JBJS Case Connect. 2013 Jun 12;3[2 Suppl 8]:1-7) has been inserted as reference 26, and the original references 26 and 29 through 35 have been renumbered accordingly. Additionally, Table I and several passages in the text have been updated to reflect the addition of the new reference. Specifically, in Table I, the study by Niemeier et al. has been inserted as the fifth row between the "Amer et al." and "Current case" rows. On page 3, the text that had read "To our knowledge, there are only 4 published cases of metachronous, polyostotic ABCs in 4 male patients-. The longest documented interval between clinical presentation of the first and second lesions is 15 years, whereas the shortest interval is 15 months." now reads "To our knowledge, there are only 5 published cases of metachronous, polyostotic ABCs in 4 male patients and 1 female patient-. The longest documented interval between clinical presentation of the first and second lesions is 15 years, whereas the shortest interval is 3 months." On page 7, the passage that had read "However, to our knowledge, there are only 4 published cases of metachronous, polyostotic ABCs, and all patients were males-. The current case demonstrates that females may also develop polyostotic disease. None of the 4 previously reported cases of metachronous, polyostotic ABCs demonstrated a previous history of malignancy-." now reads "However, to our knowledge, there are only 5 published cases of metachronous, polyostotic ABCs with only 1 case describing lesions in a female patient-. This is the second case demonstrating that females may also develop polyostotic disease. None of the 5 previously reported cases of metachronous, polyostotic ABCs demonstrated a previous history of malignancy-." Also on page 7, the sentence that had read "Metachronous ABCs are rare and have been reported to present anywhere from 15 months to 15 years after diagnosis of the initial lesion,." now reads "Metachronous ABCs are rare and have been reported to present anywhere from 3 months to 15 years after diagnosis of the initial lesion-."An erratum has been published: JBJS Case Connect. 2019 Dec 26;9(4):e0263ER. CASE We present a case involving an adolescent female who developed metachronous, polyostotic aneurysmal bone cysts (ABCs) of the left hemipelvis and left proximal tibia within a 16-month interval. At age 12 years, the left periacetabular ABC was initially treated with selective arterial embolization and percutaneous sclerotherapy, followed by intralesional curettage and bone grafting. At age 14 years, the left proximal tibia ABC was treated with intralesional curettage, bone grafting, and prophylactic internal fixation. She showed no evidence of recurrence of either lesion after 32 and 12 months, respectively. CONCLUSIONS Metachronous, polyostotic ABCs may occur in females. Metachronous lesions may present years after the initial ABC; therefore, additional imaging to rule out polyostotic disease is not indicated in the routine management of a solitary ABC. Patients with multiple ABCs should be managed by following the standard approach for treatment of each lesion.
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Affiliation(s)
- William M Naylor
- Department of Orthopaedic Surgery, University Hospitals Regional Hospitals, Richmond Heights, Ohio.,Department of Orthopaedic Surgery, Case Western Reserve University/University Hospitals Cleveland Medical Center, Cleveland, Ohio
| | - Christopher D Collier
- Department of Orthopaedic Surgery, Case Western Reserve University/University Hospitals Cleveland Medical Center, Cleveland, Ohio
| | - Raymond W Redline
- Department of Pathology, Case Western Reserve University/University Hospitals Cleveland Medical Center, Cleveland, Ohio
| | - Patrick J Getty
- Department of Orthopaedic Surgery, Case Western Reserve University/University Hospitals Cleveland Medical Center, Cleveland, Ohio
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14
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Gaumer GR, Weinberg DS, Collier CD, Getty PJ, Liu RW. An Osteological Study on the Prevalence of Osteochondromas. Iowa Orthop J 2017; 37:147-150. [PMID: 28852349 PMCID: PMC5508295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
BACKGROUND Osteochondromas are frequently reported to be the most common benign tumor of bone. However, there is not definitive data on their prevalence rate as they are often clinically silent, with previous studies estimating 1-3%. METHODS We examined a large osteologic collection of 2954 skeletons to identify likely osteochondromas. One author examined all bones excluding the skull in each skeleton for atypical cortical projections. These candidates were then evaluated by an orthopedic resident and then a fellowship trained pediatric orthopedic surgeon for final inclusion using strict criteria. RESULTS 13 cases of osteochondroma were identified from 2954 skeletons to yield a prevalence of 0.44% (95% confidence interval 0.20% - 0.68%) in the study population. All were located on long bones: three in the humerus, six in the femur and four in the tibia. CONCLUSIONS We found a prevalence of 0.44% for osteochondromas, which is approximately half the lowest value reported in previous literature.
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Affiliation(s)
- Gregory R Gaumer
- Division of Pediatric Orthopaedic Surgery Case Western Reserve University Rainbow Babies and Children's Hospital11100 Euclid Avenue, RBC 6081 Cleveland, OH 44106
| | - Doug S Weinberg
- Division of Pediatric Orthopaedic Surgery Case Western Reserve University Rainbow Babies and Children's Hospital11100 Euclid Avenue, RBC 6081 Cleveland, OH 44106
| | - Christopher D Collier
- Division of Pediatric Orthopaedic Surgery Case Western Reserve University Rainbow Babies and Children's Hospital11100 Euclid Avenue, RBC 6081 Cleveland, OH 44106
| | - Patrick J Getty
- Division of Pediatric Orthopaedic Surgery Case Western Reserve University Rainbow Babies and Children's Hospital11100 Euclid Avenue, RBC 6081 Cleveland, OH 44106
| | - Raymond W Liu
- Division of Pediatric Orthopaedic Surgery Case Western Reserve University Rainbow Babies and Children's Hospital11100 Euclid Avenue, RBC 6081 Cleveland, OH 44106
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15
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Qian SS, Chaffin JD, DuFour MR, Sherman JJ, Golnick PC, Collier CD, Nummer SA, Margida MG. Quantifying and Reducing Uncertainty in Estimated Microcystin Concentrations from the ELISA Method. Environ Sci Technol 2015; 49:14221-9. [PMID: 26516650 DOI: 10.1021/acs.est.5b03029] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We discuss the uncertainty associated with a commonly used method for measuring the concentration of microcystin, a group of toxins associated with cyanobacterial blooms. Such uncertainty is rarely reported and accounted for in important drinking water management decisions. Using monitoring data from Ohio Environmental Protection Agency and from City of Toledo, we document the sources of measurement uncertainty and recommend a Bayesian hierarchical modeling approach for reducing the measurement uncertainty. Our analysis suggests that (1) much of the uncertainty is a result of the highly uncertain "standard curve" developed during each test and (2) the uncertainty can be reduced by pooling raw test data from multiple tests. Based on these results, we suggest that estimation uncertainty can be effectively reduced through the effort of either (1) regional regulatory agencies by sharing and combining raw test data from regularly scheduled microcystin monitoring program or (2) the manufacturer of the testing kit by conducting additional tests as part of an effort to improve the testing kit.
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Affiliation(s)
- Song S Qian
- Department of Environmental Sciences, The University of Toledo , Toledo, Ohio 43606, United States
| | - Justin D Chaffin
- Franz Theodore Stone Laboratory, The Ohio State University , Put-in-Bay, Ohio 43456, United States
| | - Mark R DuFour
- Department of Environmental Sciences, The University of Toledo , Toledo, Ohio 43606, United States
| | - Jessica J Sherman
- Department of Environmental Sciences, The University of Toledo , Toledo, Ohio 43606, United States
| | - Phoenix C Golnick
- Department of Environmental Sciences, The University of Toledo , Toledo, Ohio 43606, United States
| | - Christopher D Collier
- Department of Environmental Sciences, The University of Toledo , Toledo, Ohio 43606, United States
| | - Stephanie A Nummer
- Department of Environmental Sciences, The University of Toledo , Toledo, Ohio 43606, United States
| | - Michaela G Margida
- Department of Environmental Sciences, The University of Toledo , Toledo, Ohio 43606, United States
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16
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Ma S, Eckert J, Forster PM, Yoon JW, Hwang YK, Chang JS, Collier CD, Parise JB, Zhou HC. Further Investigation of the Effect of Framework Catenation on Hydrogen Uptake in Metal−Organic Frameworks. J Am Chem Soc 2008; 130:15896-902. [DOI: 10.1021/ja803492q] [Citation(s) in RCA: 135] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shengqian Ma
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, Materials Research Laboratory, University of California, Santa Barbara, California 93106, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Catalysis Center for Molecular Engineering, Korea Research Institute of Chemical Technology (KRICT), Jang-dong 100, Yuseong-Gu, Daejon 305-600, Korea, and Mineral Physics Institute, Stony Brook University, Stony Brook, New York 11794
| | - Juergen Eckert
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, Materials Research Laboratory, University of California, Santa Barbara, California 93106, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Catalysis Center for Molecular Engineering, Korea Research Institute of Chemical Technology (KRICT), Jang-dong 100, Yuseong-Gu, Daejon 305-600, Korea, and Mineral Physics Institute, Stony Brook University, Stony Brook, New York 11794
| | - Paul M. Forster
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, Materials Research Laboratory, University of California, Santa Barbara, California 93106, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Catalysis Center for Molecular Engineering, Korea Research Institute of Chemical Technology (KRICT), Jang-dong 100, Yuseong-Gu, Daejon 305-600, Korea, and Mineral Physics Institute, Stony Brook University, Stony Brook, New York 11794
| | - Ji Woong Yoon
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, Materials Research Laboratory, University of California, Santa Barbara, California 93106, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Catalysis Center for Molecular Engineering, Korea Research Institute of Chemical Technology (KRICT), Jang-dong 100, Yuseong-Gu, Daejon 305-600, Korea, and Mineral Physics Institute, Stony Brook University, Stony Brook, New York 11794
| | - Young Kyu Hwang
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, Materials Research Laboratory, University of California, Santa Barbara, California 93106, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Catalysis Center for Molecular Engineering, Korea Research Institute of Chemical Technology (KRICT), Jang-dong 100, Yuseong-Gu, Daejon 305-600, Korea, and Mineral Physics Institute, Stony Brook University, Stony Brook, New York 11794
| | - Jong-San Chang
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, Materials Research Laboratory, University of California, Santa Barbara, California 93106, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Catalysis Center for Molecular Engineering, Korea Research Institute of Chemical Technology (KRICT), Jang-dong 100, Yuseong-Gu, Daejon 305-600, Korea, and Mineral Physics Institute, Stony Brook University, Stony Brook, New York 11794
| | - Christopher D. Collier
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, Materials Research Laboratory, University of California, Santa Barbara, California 93106, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Catalysis Center for Molecular Engineering, Korea Research Institute of Chemical Technology (KRICT), Jang-dong 100, Yuseong-Gu, Daejon 305-600, Korea, and Mineral Physics Institute, Stony Brook University, Stony Brook, New York 11794
| | - John B. Parise
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, Materials Research Laboratory, University of California, Santa Barbara, California 93106, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Catalysis Center for Molecular Engineering, Korea Research Institute of Chemical Technology (KRICT), Jang-dong 100, Yuseong-Gu, Daejon 305-600, Korea, and Mineral Physics Institute, Stony Brook University, Stony Brook, New York 11794
| | - Hong-Cai Zhou
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, Materials Research Laboratory, University of California, Santa Barbara, California 93106, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Catalysis Center for Molecular Engineering, Korea Research Institute of Chemical Technology (KRICT), Jang-dong 100, Yuseong-Gu, Daejon 305-600, Korea, and Mineral Physics Institute, Stony Brook University, Stony Brook, New York 11794
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Ma S, Sun D, Simmons JM, Collier CD, Yuan D, Zhou HC. Metal-Organic Framework from an Anthracene Derivative Containing Nanoscopic Cages Exhibiting High Methane Uptake. J Am Chem Soc 2007; 130:1012-6. [PMID: 18163628 DOI: 10.1021/ja0771639] [Citation(s) in RCA: 522] [Impact Index Per Article: 30.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shengqian Ma
- Department of Chemistry and Biochemistry, Miami University, Oxford, Ohio, 45056, NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, and Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Daofeng Sun
- Department of Chemistry and Biochemistry, Miami University, Oxford, Ohio, 45056, NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, and Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Jason M. Simmons
- Department of Chemistry and Biochemistry, Miami University, Oxford, Ohio, 45056, NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, and Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Christopher D. Collier
- Department of Chemistry and Biochemistry, Miami University, Oxford, Ohio, 45056, NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, and Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Daqiang Yuan
- Department of Chemistry and Biochemistry, Miami University, Oxford, Ohio, 45056, NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, and Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Hong-Cai Zhou
- Department of Chemistry and Biochemistry, Miami University, Oxford, Ohio, 45056, NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, and Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104
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Ma S, Wang XS, Collier CD, Manis ES, Zhou HC. Ultramicroporous Metal−Organic Framework Based on 9,10-Anthracenedicarboxylate for Selective Gas Adsorption. Inorg Chem 2007; 46:8499-501. [PMID: 17854186 DOI: 10.1021/ic701507r] [Citation(s) in RCA: 128] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An ultramicroporous metal-organic framework based on 9,10-anthracenedicarboxylate (PCN-13) has been synthesized and structurally characterized. The desolvated PCN-13 demonstrates selective adsorption of oxygen and hydrogen over nitrogen and carbon monoxide.
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Affiliation(s)
- Shengqian Ma
- Department of Chemistry & Biochemistry, Miami University, Oxford, Ohio 45056, USA
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Ma S, Wang XS, Manis ES, Collier CD, Zhou HC. Metal−Organic Framework Based on a Trinickel Secondary Building Unit Exhibiting Gas-Sorption Hysteresis. Inorg Chem 2007; 46:3432-4. [PMID: 17407286 DOI: 10.1021/ic070338v] [Citation(s) in RCA: 108] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An interpenetrating microporous metal-organic framework based on a mu3-oxotrinickel basic carboxylate secondary building unit has been synthesized and structurally characterized. It exhibits pronounced gas-sorption hysteresis and selective adsorption of carbon dioxide over methane.
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Affiliation(s)
- Shengqian Ma
- Department of Chemistry & Biochemistry, Miami University, Oxford, Ohio 45056, USA
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Abstract
Recent studies have indicated that two elements in addition to the glucocorticoid response element (GRE) are involved in the induction of the endogenous TAT gene in FuS-5 rat hepatoma cells. The first is the 21 bp glucocorticoid modulatory element (GME) at -3648 bp, which causes reporter constructs to display both a left shift in the dose-response curve for glucocorticoids and increased percentages of agonist activity for antiglucocorticoids. The second is a negative element at -3340 to -3050 that blocks the action of the GME. This last observation raised the question of how GME activity can be expressed in Fu5-5 cells in the intact TAT gene that contains both the GME and the negative element. The present study identifies a third element, a "neutralizing" sequence, that restores the activity of the GME even when otherwise inactivated by the negative element. This neutralizing sequence was located within the region surrounding the GREs of the TAT gene but is separate from the GREs. The activity of the individual GME and negative elements was found to depend upon spacing. However, in combination with the natural GRE, the native TAT gene spacing of the GME and negative elements was able to reproduce the activity of the intact gene. Thus, a total of three additional elements (an activator, a negative element, and a neutralizer) appear to cooperate with the GREs in glucocorticoid induction of the TAT gene in Fu5-5 cells. While such a grouping of elements may be novel among steroid regulated genes, it is a not uncommon occurrence for the transcriptional control of other genes.
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Affiliation(s)
- D A Jackson
- Steroid Hormones Section, NIDDK/LMCB, National Institutes of Health, Bethesda, MD 20892, USA.
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Collier CD, Oshima H, Simons SS. A negative tyrosine aminotransferase gene element that blocks glucocorticoid modulatory element-regulated modulation of glucocorticoid-induced gene expression. Mol Endocrinol 1996; 10:463-76. [PMID: 8732678 DOI: 10.1210/mend.10.5.8732678] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Tyrosine aminotransferase (TAT) is the prototypic steroid-inducible gene. Recently, we have found that the modulation of TAT induction properties is reproduced by a novel cis-acting TAT gene element, the glucocorticoid modulatory element (GME). This GME lies about 1 kb upstream of the glucocorticoid response elements (GREs) of the TAT gene and binds a heterooligomer of two recently defined proteins. We now report the existence of an additional TAT gene element between the GME and the GREs that blocks the action of the GME and thus prevents the left shift in the glucocorticoid dose-response curve caused by the GME. This negative element has the properties of a silencer because its activity is relatively position- and orientation-independent. The interaction appears to be stoichiometric in that the effects of a single negative element can be overcome by a second GME. This negative element also has an intrinsic inhibitory activity in the absence of the GME. The majority of the negative element activity could be elicited by a 56-bp sequence between -3105 and -3050 bp of the TAT gene. Multiple, clustered mutations of this sequence reduced, but did not eliminate, the negative activity. Further efforts to restrict the negative element were unsuccessful, suggesting that multiple sequences are required for full activity. High affinity, sequence-specific binding of a trans-acting factor(s) was observed in gel shift assays. This binding was half-maximally competed by a 4.4-fold excess of nonradioactive probe and was very stable once formed (delta H [symbol: see text] dissoc. = 32 kcal/mol), suggesting that low concentrations of a high affinity binding protein(s) exist in nuclear extracts. Further support for this conclusion came from the observation that cotransfection of a plasmid containing multiple copies of the 56-bp negative element was able to relieve the negation of GME activity in a GME-56-bp-GRE reporter construct. These data directly support the role of a trans-acting factor(s) in binding to the 56-bp negative element and blocking GME activity. Collectively, these data suggest that glucocorticoid induction of TAT gene expression is subject to multiple levels of control by several new cis-acting elements and thus is much more complex than previously appreciated.
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Affiliation(s)
- C D Collier
- Steroid Hormones Section, National Institute of Diabetes and Digestive and Kidney Diseases@Laboratory of Molecular and Cellular Biology, National Institute of Health, Bethesda, Maryland 20892, USA
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Collier CD, Johnson JR. The Escherichia coli K-12 metJ193 allele contains a point mutation which alters the hydrophobic pocket responsible for in vitro binding of S-adenosylmethionine: effects on cell growth and induction of met regulon expression. J Bacteriol 1990; 172:3918-24. [PMID: 2141834 PMCID: PMC213374 DOI: 10.1128/jb.172.7.3918-3924.1990] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [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: 12/30/2022] Open
Abstract
The metJ193 allele encodes one of two identified temperature-sensitive Escherichia coli K-12 met repressors. The nucleotide sequence of the metJ193 allele was determined. The point mutation was a T to A transversion at base 170 of the metJ193 open reading frame and resulted in the substitution of leucine by glutamine at the 56th amino acid residue of the MetJ193 protein. The mutational lesion altered the hydrophobic pocket responsible for in vitro binding of the corepressor S-adenosylmethionine by wild-type MetJ. MetJ193 protein formed at the permissive temperature (28 degrees C) allowed slow derepression of met regulon expression when cultures were shifted to the nonpermissive temperature (34 degrees C). When 28 degrees C cultures of strains bearing two metJ193 alleles were transferred from methionine-containing medium to minimal medium, derepression of met regulon expression did not occur quickly enough to avoid a lag in growth due to the methionine deprivation. The inability of the MetJ193 protein to easily accomplish transition between apo- and active-repressor conformations was also demonstrated by using a maxicell system to study expression of a plasmid-borne copy of the E. coli metF transcription unit. These results confirm the importance of the leucine 56 residue for the structure and function in vivo of the wild-type MetJ protein.
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Affiliation(s)
- C D Collier
- Department of Microbiology, Miami University, Oxford, Ohio 45056
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Bala GA, Collier CD, Emmett MR, Johnson JR. Characterization of two mutant metJ proteins with reduced, temperature-dependent capacity to regulate Escherichia coli K-12 met regulon elements. J Bacteriol 1989; 171:4095-9. [PMID: 2525552 PMCID: PMC210172 DOI: 10.1128/jb.171.7.4095-4099.1989] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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: 01/01/2023] Open
Abstract
At 28 degrees C, but not at 34 or 42 degrees C, strains with the metJ193 allele repressed chromosomal met genes but not a plasmid-borne met promoter. Increasing the metJ193 gene dosage to two copies resulted in overrepression of chromosomal and plasmid-borne met promoters at 28 degrees C. Suppressing the metJ185 amber mutation with supF (tRNATyr) produced the MetJ185F protein. Strains producing MetJ185F repressed chromosomal met promoters but not a plasmid-borne met promoter at 42 degrees C. These are the first known defective MetJ proteins with documented temperature-dependent function.
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Affiliation(s)
- G A Bala
- Department of Microbiology, Miami University, Oxford, Ohio 45056
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