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Kelly Brewer Center for Molecular Oncology, University of Connecticut School of Medicine, Farmington, Connecticut, USA

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Isabel Nip Center for Molecular Oncology, University of Connecticut School of Medicine, Farmington, Connecticut, USA

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Justin Bellizzi Center for Molecular Oncology, University of Connecticut School of Medicine, Farmington, Connecticut, USA

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Jessica Costa-Guda Center for Molecular Oncology, University of Connecticut School of Medicine, Farmington, Connecticut, USA
Center for Regenerative Medicine and Skeletal Development, Department of Reconstructive Sciences, University of Connecticut School of Dental Medicine, Farmington, Connecticut, USA

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Andrew Arnold Center for Molecular Oncology, University of Connecticut School of Medicine, Farmington, Connecticut, USA
Division of Endocrinology and Metabolism, University of Connecticut School of Medicine, Farmington, Connecticut, USA

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). Approximately 85% of all PHPT cases are caused by sporadic single-gland parathyroid adenomas (PTAs), benign tumors which typically release inappropriately high levels of parathyroid hormone (PTH) and cause hypercalcemia, in turn often leading to osteoporosis

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Bekir Cakir Department of Endocrinology and Metabolism, Faculty of Medicine, Ankara Yildirim Beyazit University, Ankara, Turkey

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F Neslihan Cuhaci Seyrek Department of Endocrinology and Metabolism, Faculty of Medicine, Ankara Yildirim Beyazit University, Ankara, Turkey

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Oya Topaloglu Department of Endocrinology and Metabolism, Faculty of Medicine, Ankara Yildirim Beyazit University, Ankara, Turkey

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Didem Ozdemir Department of Endocrinology and Metabolism, Faculty of Medicine, Ankara Yildirim Beyazit University, Ankara, Turkey

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Ahmet Dirikoc Department of Endocrinology and Metabolism, Faculty of Medicine, Ankara Yildirim Beyazit University, Ankara, Turkey

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Cevdet Aydin Department of Endocrinology and Metabolism, Faculty of Medicine, Ankara Yildirim Beyazit University, Ankara, Turkey

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Sefika Burcak Polat Department of Endocrinology and Metabolism, Faculty of Medicine, Ankara Yildirim Beyazit University, Ankara, Turkey

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Berna Evranos Ogmen Department of Endocrinology and Metabolism, Faculty of Medicine, Ankara Yildirim Beyazit University, Ankara, Turkey

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Ali Abbas Tam Department of Endocrinology and Metabolism, Faculty of Medicine, Ankara Yildirim Beyazit University, Ankara, Turkey

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Husniye Baser Department of Endocrinology and Metabolism, Faculty of Medicine, Ankara Yildirim Beyazit University, Ankara, Turkey

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Aylin Kilic Yazgan Department of Pathology, Ankara Ataturk Education and Research Hospital, Ankara, Turkey

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Mehmet Kilic Department of General Surgery, Faculty of Medicine, Ankara Yildirim Beyazit University, Ankara, Turkey

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Afra Alkan Department of Biostatistics, Faculty of Medicine, Ankara Yildirim Beyazit University, Ankara, Turkey

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Reyhan Ersoy Department of Endocrinology and Metabolism, Faculty of Medicine, Ankara Yildirim Beyazit University, Ankara, Turkey

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serum calcium (Ca) levels ( 3 ). Accordingly, 85–90% of PHPT cases are caused by parathyroid adenomas (PAs), a type of benign tumour ( 4 ), with other causes including double adenoma (4%), multiple gland hyperplasia (6%) and parathyroid carcinoma (<1

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Felix Haglund Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden
Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden

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Gustaf Rosin Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden
Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden
Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden

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Inga-Lena Nilsson Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden

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C Christofer Juhlin Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden
Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden

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Ylva Pernow Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden

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Sophie Norenstedt Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden

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Andrii Dinets Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden
Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden
Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden

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Catharina Larsson Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden
Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden

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Johan Hartman Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden
Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden

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Anders Höög Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden
Department of Oncology–Pathology, Cancer Centre Karolinska, Department of Biosciences and Nutrition, Department of Molecular Medicine and Surgery, Department of Surgery #4, Karolinska Institutet, Stockholm, Sweden

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studies, e.g. inactivating mutations of MEN1 in parathyroid adenomas or cell division cycle 73 ( CDC73 ) in parathyroid carcinomas (7, 8, 9) . Recent whole-exome sequencing studies of parathyroid adenomas have overall revealed few non

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Qian Wang Department of Thyroid and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China

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Jiacheng Wang Department of Thyroid and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China

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Yunhui Xin Department of Thyroid and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China

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Ziyang He Department of Thyroid and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China

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Xiang Zhou Department of Pathology, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China

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Xing Liu Department of Thyroid and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China

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Teng Zhao Department of Thyroid and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China

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Lihan He Department of Thyroid and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China

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Hong Shen Department of Thyroid and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China

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Mulan Jin Department of Pathology, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China

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Bojun Wei Department of Thyroid and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China

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in patients with pathologically confirmed parathyroid carcinoma (PC) and parathyroid adenoma (PA). Characteristics Number ( n  = 54, %) PC ( n  = 14, %) PA ( n  = 40, %) P Gender  Female 35 (65) 7 (50

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Magdaléna Fořtová Department of Medical Chemistry and Clinical Biochemistry, Charles University, Second Faculty of Medicine and University Hospital Motol, Prague, Czech Republic

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Lenka Hanousková Department of Medical Chemistry and Clinical Biochemistry, Charles University, Second Faculty of Medicine and University Hospital Motol, Prague, Czech Republic

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Martin Valkus Department of Medical Chemistry and Clinical Biochemistry, Charles University, Second Faculty of Medicine and University Hospital Motol, Prague, Czech Republic

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Jana Čepová Department of Medical Chemistry and Clinical Biochemistry, Charles University, Second Faculty of Medicine and University Hospital Motol, Prague, Czech Republic

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Richard Průša Department of Medical Chemistry and Clinical Biochemistry, Charles University, Second Faculty of Medicine and University Hospital Motol, Prague, Czech Republic

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Karel Kotaška Department of Medical Chemistry and Clinical Biochemistry, Charles University, Second Faculty of Medicine and University Hospital Motol, Prague, Czech Republic

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Introduction About 80–90% of primary hyperparathyroidism (pHPT) cases are caused by parathyroid adenoma. Long-term increased parathyroid hormone (PTH) secretion leads to a generalized disorder of calcium, phosphate and bone metabolism. The

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Boju Pan Department of Pathology, Molecular Pathology Research Center, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China

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Anqi Wang Clinical Biobank, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China

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Junyi Pang Department of Pathology, Molecular Pathology Research Center, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China

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Yuhan Zhang Department of Pathology, Molecular Pathology Research Center, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China

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Ming Cui Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China

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Jian Sun Department of Pathology, Molecular Pathology Research Center, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China

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Zhiyong Liang Department of Pathology, Molecular Pathology Research Center, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China

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carcinomas ( 14 ), pheochromocytomas ( 15 ) and gastroenteropancreatic neuroendocrine neoplasms ( 16 ). But PD-L1 expression was significantly different among these tumor types. No studies have investigated PD-L1 expression in parathyroid adenoma and

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Sara Storvall Department of Endocrinology, Abdominal Center, University of Helsinki and Helsinki University Hospital, Helsinki, Finland

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Helena Leijon Department of Pathology and Huslab, University of Helsinki and Helsinki University Hospital, Helsinki, Finland

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Eeva Ryhänen Department of Endocrinology, Abdominal Center, University of Helsinki and Helsinki University Hospital, Helsinki, Finland

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Johanna Louhimo Department of Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland

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Caj Haglund Department of Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland

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Camilla Schalin-Jäntti Department of Endocrinology, Abdominal Center, University of Helsinki and Helsinki University Hospital, Helsinki, Finland

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Johanna Arola Department of Pathology and Huslab, University of Helsinki and Helsinki University Hospital, Helsinki, Finland

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Introduction Primary hyperparathyroidism (PHPT) is a common endocrine disease usually caused by a parathyroid adenoma (in 85% of cases) or by glandular hyperplasia (15% of cases). Parathyroid carcinoma is only rarely the underlying cause (PC

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Elizaveta Mamedova Department of Neuroendocrinology and Bone Diseases, Endocrinology Research Center, Moscow, Russian Federation

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Natalya Mokrysheva Department of Parathyroid Diseases, Endocrinology Research Center, Moscow, Russian Federation

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Evgeny Vasilyev Department and Laboratory of Inherited Endocrine Disorders, Endocrinology Research Center, Moscow, Russian Federation

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Vasily Petrov Department and Laboratory of Inherited Endocrine Disorders, Endocrinology Research Center, Moscow, Russian Federation

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Ekaterina Pigarova Department of Neuroendocrinology and Bone Diseases, Endocrinology Research Center, Moscow, Russian Federation

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Sergey Kuznetsov Department of Surgery, Endocrinology Research Center, Moscow, Russian Federation

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Nikolay Kuznetsov Department of Surgery, Endocrinology Research Center, Moscow, Russian Federation

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Liudmila Rozhinskaya Department of Neuroendocrinology and Bone Diseases, Endocrinology Research Center, Moscow, Russian Federation

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Galina Melnichenko I.M. Sechenov First Moscow State Medical University, Moscow, Russian Federation
Institute of Clinical Endocrinology, Endocrinology Research Center, Moscow, Russian Federation

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Ivan Dedov Endocrinology Research Center, Moscow, Russian Federation

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Anatoly Tiulpakov Department and Laboratory of Inherited Endocrine Disorders, Endocrinology Research Center, Moscow, Russian Federation

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deletion of the whole CDC73 gene in a female with parathyroid carcinoma from FIHP family and (B) a deletion of 1–10 exons of CDC73 gene in a male with atypical parathyroid adenoma. Clinical data The genetic analysis allowed us to divide

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Elena Pardi Endocrine Unit 2, Endocrinology Unit, Institute of Pathology, Department of Surgical, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, Pisa, Italy

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Stefano Mariotti Endocrine Unit 2, Endocrinology Unit, Institute of Pathology, Department of Surgical, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, Pisa, Italy

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Natalia S Pellegata Endocrine Unit 2, Endocrinology Unit, Institute of Pathology, Department of Surgical, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, Pisa, Italy

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Katiuscia Benfini Endocrine Unit 2, Endocrinology Unit, Institute of Pathology, Department of Surgical, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, Pisa, Italy

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Simona Borsari Endocrine Unit 2, Endocrinology Unit, Institute of Pathology, Department of Surgical, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, Pisa, Italy

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Federica Saponaro Endocrine Unit 2, Endocrinology Unit, Institute of Pathology, Department of Surgical, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, Pisa, Italy

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Liborio Torregrossa Endocrine Unit 2, Endocrinology Unit, Institute of Pathology, Department of Surgical, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, Pisa, Italy

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Antonello Cappai Endocrine Unit 2, Endocrinology Unit, Institute of Pathology, Department of Surgical, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, Pisa, Italy

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Chiara Satta Endocrine Unit 2, Endocrinology Unit, Institute of Pathology, Department of Surgical, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, Pisa, Italy

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Marco Mastinu Endocrine Unit 2, Endocrinology Unit, Institute of Pathology, Department of Surgical, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, Pisa, Italy

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Claudio Marcocci Endocrine Unit 2, Endocrinology Unit, Institute of Pathology, Department of Surgical, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, Pisa, Italy

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Filomena Cetani Endocrine Unit 2, Endocrinology Unit, Institute of Pathology, Department of Surgical, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, Pisa, Italy

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Introduction Multiple endocrine neoplasia type 1 (MEN1, OMIM #131100) is a rare autosomal dominant endocrine disorder characterized by the occurrence of parathyroid adenoma/hyperplasia, duodeno–pancreatic neuroendocrine tumors (NETs), and anterior

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Keiko Ohkuwa Department of Surgery, Ito Hospital, Tokyo, Japan

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Kiminori Sugino Department of Surgery, Ito Hospital, Tokyo, Japan

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Ryohei Katoh Department of Pathology, Ito Hospital, Tokyo, Japan

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Mitsuji Nagahama Department of Surgery, Ito Hospital, Tokyo, Japan

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Wataru Kitagawa Department of Surgery, Ito Hospital, Tokyo, Japan

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Kenichi Matsuzu Department of Surgery, Ito Hospital, Tokyo, Japan

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Akifumi Suzuki Department of Surgery, Ito Hospital, Tokyo, Japan

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Chisato Tomoda Department of Surgery, Ito Hospital, Tokyo, Japan

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Kiyomi Hames Department of Surgery, Ito Hospital, Tokyo, Japan

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Junko Akaishi Department of Surgery, Ito Hospital, Tokyo, Japan

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Chie Masaki Department of Surgery, Ito Hospital, Tokyo, Japan

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Kana Yoshioka Department of Surgery, Ito Hospital, Tokyo, Japan

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Koichi Ito Department of Surgery, Ito Hospital, Tokyo, Japan

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clinicians is the lack of specific clinical, biochemical, and imaging features that distinguish PC from parathyroid adenoma (PA). Thus, in clinical practice, PC is often diagnosed through histopathological examinations after surgery and diagnosis after

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