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Yan R, Jiang R, Hu L, Deng Y, Wen J, Jiang X. Establishment and assessment of rodent models of medication-related osteonecrosis of the jaw (MRONJ). Int J Oral Sci 2022; 14:41. [PMID: 35948539 PMCID: PMC9365764 DOI: 10.1038/s41368-022-00182-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Revised: 05/21/2022] [Accepted: 05/24/2022] [Indexed: 11/26/2022] Open
Abstract
Medication-related osteonecrosis of the jaw (MRONJ) is primarily associated with administering antiresorptive or antiangiogenic drugs. Despite significant research on MRONJ, its pathogenesis and effective treatments are still not fully understood. Animal models can be used to simulate the pathophysiological features of MRONJ, serving as standardized in vivo experimental platforms to explore the pathogenesis and therapies of MRONJ. Rodent models exhibit excellent effectiveness and high reproducibility in mimicking human MRONJ, but classical methods cannot achieve a complete replica of the pathogenesis of MRONJ. Modified rodent models have been reported with improvements for better mimicking of MRONJ onset in clinic. This review summarizes representative classical and modified rodent models of MRONJ created through various combinations of systemic drug induction and local stimulation and discusses their effectiveness and efficiency. Currently, there is a lack of a unified assessment system for MRONJ models, which hinders a standard definition of MRONJ-like lesions in rodents. Therefore, this review comprehensively summarizes assessment systems based on published peer-review articles, including new approaches in gross observation, histological assessments, radiographic assessments, and serological assessments. This review can serve as a reference for model establishment and evaluation in future preclinical studies on MRONJ.
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Affiliation(s)
- Ran Yan
- Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Jiao Tong University, Shanghai, China.,College of Stomatology, Shanghai Jiao Tong University, Shanghai, China.,National Center for Stomatology, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology, Shanghai Engineering Research Center of Advanced Dental Technology and Materials, Shanghai, China
| | - Ruixue Jiang
- Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Jiao Tong University, Shanghai, China.,College of Stomatology, Shanghai Jiao Tong University, Shanghai, China.,National Center for Stomatology, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology, Shanghai Engineering Research Center of Advanced Dental Technology and Materials, Shanghai, China
| | - Longwei Hu
- College of Stomatology, Shanghai Jiao Tong University, Shanghai, China.,National Center for Stomatology, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology, Shanghai Engineering Research Center of Advanced Dental Technology and Materials, Shanghai, China.,Department of Oral and Maxillofacial-Head and Neck Oncology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Yuwei Deng
- Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Jiao Tong University, Shanghai, China.,College of Stomatology, Shanghai Jiao Tong University, Shanghai, China.,National Center for Stomatology, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology, Shanghai Engineering Research Center of Advanced Dental Technology and Materials, Shanghai, China
| | - Jin Wen
- Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Jiao Tong University, Shanghai, China. .,College of Stomatology, Shanghai Jiao Tong University, Shanghai, China. .,National Center for Stomatology, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology, Shanghai Engineering Research Center of Advanced Dental Technology and Materials, Shanghai, China.
| | - Xinquan Jiang
- Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Jiao Tong University, Shanghai, China. .,College of Stomatology, Shanghai Jiao Tong University, Shanghai, China. .,National Center for Stomatology, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology, Shanghai Engineering Research Center of Advanced Dental Technology and Materials, Shanghai, China.
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Therapy-induced bone changes in oncology imaging with 18F-sodium fluoride (NaF) PET-CT. Ann Nucl Med 2022; 36:329-339. [PMID: 35218508 DOI: 10.1007/s12149-022-01730-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Accepted: 02/13/2022] [Indexed: 11/01/2022]
Abstract
18F-Sodium fluoride (18F-NaF) is a PET tracer that is mostly used in the evaluation of bone metastasis in oncology cases. Recently, 18F-NaF PET/CT is gaining wide popularity owing to its higher sensitivity over the other conventional bone tracer with higher and rapid single-pass extraction, negligible plasma protein binding, rapid blood, and renal clearance. In the era of constant evolution of cancer therapy regimens, considerable bone health impact is seen in the form of avascular necrosis, insufficiency fractures, among others. A significant number of these therapy-induced changes show high bone turnover and thereby 18F-NaF accumulation, mimicking metastatic lesions. This article summarizes and illustrates the pattern and morphological features of 18F-NaF PET/CT findings in these changes in the context of clinical and therapeutic history.
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Aguirre JI, Castillo EJ, Kimmel DB. Preclinical models of medication-related osteonecrosis of the jaw (MRONJ). Bone 2021; 153:116184. [PMID: 34520898 PMCID: PMC8743993 DOI: 10.1016/j.bone.2021.116184] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 08/15/2021] [Accepted: 09/07/2021] [Indexed: 01/20/2023]
Abstract
Medication-related osteonecrosis of the jaw (MRONJ) is a potentially severe adverse event affecting patients with cancer and patients with osteoporosis who have been treated with powerful antiresorptives (pARs) or angiogenesis inhibitors (AgIs). pARs, including nitrogen-containing bisphosphonates (N-BPs; e.g., zoledronic acid, alendronate) and anti-RANKL antibodies (e.g., denosumab), are used to manage bone metastases in patients with cancer or to prevent fragility fractures in patients with osteoporosis. Though significant advances have been made in understanding MRONJ, its pathophysiology is still not fully elucidated. Multiple species have been used in preclinical MRONJ research, including the rat, mouse, rice rat, rabbit, dog, sheep, and pig. Animal research has contributed immensely to advancing the MRONJ field, particularly, but not limited to, in developing models and investigating risk factors that were first observed in humans. MRONJ models have been developed using clinically relevant doses of systemic risk factors, like N-BPs, anti-RANKL antibodies, or AgIs. Specific local oral risk factors first noted in humans, including tooth extraction and inflammatory dental disease (e.g., periodontitis, periapical infection, etc.), were then added. Research in rodents, particularly the rat, and, to some extent, the mouse, across multiple laboratories, has contributed to establishing multiple relevant and complementary preclinical models. Models in larger species produced accurate clinical and histopathologic outcomes suggesting a potential role for confirming specific crucial findings from rodent research. We view the current state of animal models for MRONJ as good. The rodent models are now reliable enough to produce large numbers of MRONJ cases that could be applied in experiments testing treatment modalities. The course of MRONJ, including stage 0 MRONJ, is characterized well enough that basic studies of the molecular or enzyme-level findings in different MRONJ stages are possible. This review provides a current overview of the existing models of MRONJ, their more significant features and findings, and important instances of their application in preclinical research.
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Affiliation(s)
- J I Aguirre
- Department of Physiological Sciences, University of Florida (UF), Gainesville, FL, United States of America.
| | - E J Castillo
- Department of Physiological Sciences, University of Florida (UF), Gainesville, FL, United States of America.
| | - D B Kimmel
- Department of Physiological Sciences, University of Florida (UF), Gainesville, FL, United States of America
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Raynor WY, Borja AJ, Hancin EC, Werner TJ, Alavi A, Revheim ME. Novel Musculoskeletal and Orthopedic Applications of 18F-Sodium Fluoride PET. PET Clin 2021; 16:295-311. [PMID: 33589389 DOI: 10.1016/j.cpet.2020.12.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
PET imaging with 18F-sodium fluoride (NaF), combined with computed tomography or magnetic resonance, is a sensitive method of assessing bone turnover. Although NaF-PET is gaining popularity in detecting prostate cancer metastases to bone marrow, osseous changes represent secondary effects of cancer cell growth. PET tracers more appropriate for assessing prostate cancer metastases directly portray malignant activity and include 18F-fluciclovine and prostatic specific membrane antigen ligands. Recent studies investigating NaF-PET suggest utility in the assessment of benign musculoskeletal disorders. Emerging applications in assessing traumatic injuries, joint disease, back pain, orthopedic complications, and metabolic bone disease are discussed.
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Affiliation(s)
- William Y Raynor
- Department of Radiology, Hospital of the University of Pennsylvania, 3400 Spruce Street, Philadelphia, PA 19104, USA; Drexel University College of Medicine, 2900 West Queen Lane, Philadelphia, PA 19129, USA
| | - Austin J Borja
- Department of Radiology, Hospital of the University of Pennsylvania, 3400 Spruce Street, Philadelphia, PA 19104, USA; Perelman School of Medicine at the University of Pennsylvania, 3400 Civic Center Boulevard, Philadelphia, PA 19104, USA
| | - Emily C Hancin
- Department of Radiology, Hospital of the University of Pennsylvania, 3400 Spruce Street, Philadelphia, PA 19104, USA; Lewis Katz School of Medicine at Temple University, 3500 North Broad Street, Philadelphia, PA 19140, USA
| | - Thomas J Werner
- Department of Radiology, Hospital of the University of Pennsylvania, 3400 Spruce Street, Philadelphia, PA 19104, USA
| | - Abass Alavi
- Department of Radiology, Hospital of the University of Pennsylvania, 3400 Spruce Street, Philadelphia, PA 19104, USA
| | - Mona-Elisabeth Revheim
- Department of Radiology, Hospital of the University of Pennsylvania, 3400 Spruce Street, Philadelphia, PA 19104, USA; Division of Radiology and Nuclear Medicine, Oslo University Hospital, Sognsvannsveien 20, Oslo 0372, Norway; Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Problemveien 7, Oslo 0315, Norway.
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Munhoz L, de Brito MAD, Arita ES, Sapienza MT. 18F-NaF uptake in dentomaxillofacial bones as a result of oral alterations: a positron emission tomography/computerized tomography scanning study. Oral Radiol 2021; 37:669-676. [PMID: 33428105 DOI: 10.1007/s11282-020-00509-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2020] [Accepted: 12/22/2020] [Indexed: 11/25/2022]
Abstract
OBJECTIVES 18F-NaF is a bone scanning radiotracer that reflects changes in bone metabolism, and it is applied in oncology to scan bone tumors or metastasis. Dentomaxillofacial alterations can lead to 18F-NaF uptake and could lead to false-positive results in PET/CT examinations. Hence, the objective of this research was to verify if the uptake of 18F-NaF in the mandible or maxilla is correlated to the presence of odontogenic alterations, which could lead to false-positive results in positron emission tomography/computerized tomography (PET/CT) examinations. METHODS 42 patients who underwent 18F-NaF PET/CT examinations and panoramic radiographs to detect bone metastasis and to assess oral conditions before oncologic treatment were included. Edentulous patients and patients with neoplasms in the maxillofacial area, and those whose imaging examinations had technical failures were excluded from the study. RESULTS A total of 252 areas from panoramic radiographs and PET/CT examinations were assessed. It was observed that the presence of periodontal bone loss resulted in a higher number of cases with false negatives. Accuracy, sensitivity, and specificity of 18F-NaF uptake-regardless of the type of odontogenic origin alteration-were 76.2%, 53.3%, and 89.4%, respectively. CONCLUSION 18F-NaF uptake in the maxilla or mandible could be influenced by oral alterations in the alveolar bones. The alterations in the oral cavity that lead to 18F-NaF accumulation should be recognized by medical radiologists to prevent false-positive results in PET/CT examinations using the tracer 18F-NaF.
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Affiliation(s)
- Luciana Munhoz
- Department of Stomatology, School of Dentistry, São Paulo University, 2227 Lineu Prestes Avenue, São Paulo, SP, 05508-000, Brazil.
| | - Mayara Aguilar Dias de Brito
- Radiology Institute, Hospital das Clínicas, Medicine School, São Paulo University, 75, Dr. Ovídio Pires de Campos Street, São Paulo, SP, 05403-010, Brazil
| | - Emiko Saito Arita
- Department of Stomatology, School of Dentistry, São Paulo University, 2227 Lineu Prestes Avenue, São Paulo, SP, 05508-000, Brazil
| | - Marcelo Taiti Sapienza
- Radiology Institute, Hospital das Clínicas, Medicine School, São Paulo University, 75, Dr. Ovídio Pires de Campos Street, São Paulo, SP, 05403-010, Brazil
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Moreno-Rabié C, Gaêta-Araujo H, Oliveira-Santos C, Politis C, Jacobs R. Early imaging signs of the use of antiresorptive medication and MRONJ: a systematic review. Clin Oral Investig 2020; 24:2973-2989. [PMID: 32627123 DOI: 10.1007/s00784-020-03423-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 06/18/2020] [Indexed: 12/21/2022]
Abstract
OBJECTIVE The main aim is to identify, by means of different imaging modalities, the early bone changes in patients "at risk" and in stage 0 MRONJ. MATERIALS AND METHODS A search of the literature was performed on PubMed, Embase, Web of Science, and Cochrane Library databases, until June 9, 2020. No language or year restrictions were applied. Screening of the articles, data collection, and qualitative analysis was done. The Newcastle-Ottawa Scale (NOS) was used for observational studies, and the Systematic Review Centre for Laboratory Animal Experimentation's (SYRCLE) risk of bias tool for the animal studies. RESULTS A total of 1188 articles were found, from which 47 were considered eligible, whereas 42 were suitable for the qualitative analysis. They correspond to 39 human studies and 8 animal studies. Radiographic findings such as bone sclerosis, osteolytic areas, thickening of lamina dura, persisting alveolar socket, periapical radiolucency, thicker mandibular cortex, widening of the periodontal ligament space, periodontal bone loss, and enhancement of the mandibular canal were identified as early bone changes due to antiresorptive therapy. All those findings were also reported later in Stage 0 patients. CONCLUSION The main limitations of these results are the lack of prospective data and comparisons groups; therefore, careful interpretation should be made. It is a fact that radiographic findings are present in antiresorptive-treated patients, but the precise timepoint of occurrence, their relation to the posology, and potential risk to develop MRONJ are not clear. CLINICAL RELEVANCE The importance of a baseline radiographic diagnosis for antiresorptive-treated patients.
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Affiliation(s)
- Catalina Moreno-Rabié
- OMFS-IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, University of Leuven, Leuven, Belgium.
- Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium.
| | - Hugo Gaêta-Araujo
- OMFS-IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, University of Leuven, Leuven, Belgium
- Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Sao Paulo, Brazil
| | - Christiano Oliveira-Santos
- Department of Stomatology, Public Oral Health, Forensic Dentistry, Division of Oral Radiology, School of Dentistry of Ribeirao Preto, University of Sao Paulo, Sao Paulo, Brazil
| | - Constantinus Politis
- OMFS-IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, University of Leuven, Leuven, Belgium
- Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Reinhilde Jacobs
- OMFS-IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, University of Leuven, Leuven, Belgium
- Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
- Department of Dental Medicine, Karolinska Institutet, Stockholm, Sweden
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Kuroshima S, Sasaki M, Murata H, Sawase T. Medication‐related osteonecrosis of the jaw‐like lesions in rodents: A comprehensive systematic review and meta‐analysis. Gerodontology 2019; 36:313-324. [DOI: 10.1111/ger.12416] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 02/05/2019] [Accepted: 04/29/2019] [Indexed: 12/28/2022]
Affiliation(s)
- Shinichiro Kuroshima
- Department Applied Prosthodontics, Institute of Biomedical Sciences Nagasaki University Nagasaki Japan
| | - Muneteru Sasaki
- Department Applied Prosthodontics, Institute of Biomedical Sciences Nagasaki University Nagasaki Japan
| | - Hiroshi Murata
- Department of Prosthetic Dentistry, Institute of Biomedical Sciences Nagasaki University Nagasaki Japan
| | - Takashi Sawase
- Department Applied Prosthodontics, Institute of Biomedical Sciences Nagasaki University Nagasaki Japan
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Clinical Nononcologic Applications of PET/CT and PET/MRI in Musculoskeletal, Orthopedic, and Rheumatologic Imaging. AJR Am J Roentgenol 2019; 210:W245-W263. [PMID: 29787313 DOI: 10.2214/ajr.17.18523] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
OBJECTIVE With improvements in PET/CT and PET/MRI over the last decade, as well as increased understanding of the pathophysiology of musculoskeletal diseases, there is an emerging potential for PET as a primary or complementary modality in the management of rheumatologic and orthopedic conditions. CONCLUSION We discuss the role of PET/CT and PET/MRI in nononcologic musculoskeletal disorders, including inflammatory and infectious conditions and postoperative complications. There is great potential for an increased role for PET to serve as a primary or complementary modality in the management of orthopedic and rheumatologic disorders.
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Mergoni G, Vescovi P, Passerini P, Maestri R, Corradi D, Sala R, Govoni P. Effects of zoledronic acid and dexamethasone on early phases of socket healing after tooth extraction in rats: A preliminary macroscopic and microscopic quantitative study. Med Oral Patol Oral Cir Bucal 2019; 24:e339-e345. [PMID: 31011145 PMCID: PMC6530960 DOI: 10.4317/medoral.22883] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Accepted: 03/22/2019] [Indexed: 01/11/2023] Open
Abstract
Background The exact pathogenesis of medication-related osteonecrosis of the jaw (MRONJ) is still unknown. The aim of this paper was to investigate the effects of zoledronic acid and dexamethasone on the early phases of socket healing in rats subjected to tooth extractions. Material and Methods Thirty male Sprague-Dawley rats were divided into 2 groups: pharmacologically treated group (T, n=20) and non-pharmacologically treated group (C, n=10). T group rats received 0.1 mg/Kg of zoledronic acid (ZOL) and 1 mg/Kg of dexamethasone (DEX) three times a week for 10 consecutive weeks. C group rats were infused with vehicle. After 9 weeks from the first infusion, first maxillary molars were extracted in each of the rats. Quantitative macroscopic and microscopic analysis was performed to evaluate socket healing 8 days after extraction. Results Pharmacologically treated rats showed significant inhibition of bone remodeling. Connective tissue/alveolar bone ratio, osteoclast number and woven bone deposition were significantly reduced in group T compared to group C. Conversely, the proportion of necrotic bone was higher in group T compared to group C (0.8% and 0.3%, respectively. P=0.031). ZOL plus DEX do not cause gross effects on socket healing at a macroscopic level. Conclusions Our findings confirmed that exposure to ZOL plus DEX impairs alveolar wound repair. Inhibition of osteoclastic resorption of socket walls after tooth extraction and the inability to dispose of the necrotic bone may be considered the initial steps of MRONJ onset. Key words:Medication-related osteonecrosis of the jaw, zoledronic acid, dexamethasone, tooth extraction, rat.
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Affiliation(s)
- G Mergoni
- Centro Universitario di Odontoiatria Dipartimento di Medicina e Chirurgia, Università di Parma, Parma, Italy Via Gramsci 14, Parma, Italy, 43100,
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Reilly CC, Raynor WY, Hong AL, Kargilis DC, Lee JS, Alecxih AG, Gupta N, Lim MK, Al-Zaghal A, Werner TJ, Rhodes SS, Alavi A, Rajapakse CS. Diagnosis and Monitoring of Osteoporosis With 18F-Sodium Fluoride PET: An Unavoidable Path for the Foreseeable Future. Semin Nucl Med 2018; 48:535-540. [PMID: 30322479 DOI: 10.1053/j.semnuclmed.2018.07.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The prevalence of metabolic bone diseases particularly osteoporosis and its precursor, osteopenia, continue to grow as serious global health issues today. On a worldwide perspective, 200million people suffer from osteoporosis and in 2005, over 2million fracture incidents were estimated due to osteoporosis in the United States. Currently, osteoporosis and other metabolic bone diseases are evaluated primarily through dual energy X-ray absorptiometry, and rarely by bone biopsy with tetracycline labeling or Technetium-99m (99mTc) based bone scintigraphy. Deficiencies in these methods have prompted the use of more precise methods of assessment. This review highlights the use of 18F-sodium fluoride (NaF) with PET (NaF-PET), NaF-PET/CT, or NaF-PET/MRI in the evaluation of osteoporosis and osteopenia in the lumbar spine and hip. This imaging modality provides a molecular perspective with respect to the underlying metabolic alterations that lead to osseous disorders by measuring bone turnover through standardized uptake values. Its sensitivity and ability to examine the entire skeletal system make it a more superior imaging modality compared to standard structural imaging techniques. Further research is needed to determine its accuracy in reflecting the efficacy of therapeutic interventions in metabolic bone diseases.
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Affiliation(s)
| | | | | | | | - Jae S Lee
- University of Pennsylvania, Philadelphia, PA
| | | | | | - Marie K Lim
- University of Pennsylvania, Philadelphia, PA
| | | | | | | | - Abass Alavi
- University of Pennsylvania, Philadelphia, PA
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