Colorado PROFILES, The Colorado Clinical and Translational Sciences Institute (CCTSI)
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Joshua P Klopper

TitleAssoc Professor Adjoint
InstitutionUniversity of Colorado Denver - Anschutz Medical Campus
DepartmentSOM-MED
Phone303/724-3921

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    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Faculty can login to make corrections and additions.
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    1. Kaykov A, Geurink C, Klopper J. Comment on Chowdhury et al. Impact of Molecular Testing on Surgical Decision-Making in Indeterminate Thyroid Nodules: A Systematic Review and Meta-Analysis of Recent Advancements. Cancers 2025, 17, 1156. Cancers (Basel). 2026 Jul 16; 18(14). PMID: 42512358.
      View in: PubMed
    2. Barrett TF, Jama M, Alshalalfa M, Tharakan T, Hao Y, Klopper JP, Cavazos TB, Jackson RS, Pipkorn P, Rich JT, Zolkind PA, Adkins DR, Oppelt P, Apicelli AJ, Rammohan N, Brown TC, Puram SV, Jasim S, Harbison RA. Development of Novel mRNA Classifiers to Stratify Preoperative Thyroid Tumor Risk. Otolaryngol Head Neck Surg. 2026 Sep; 175(3):578-586. PMID: 42429096.
      View in: PubMed
    3. Ravin E, Alshalalfa M, Jiang R, Hao Y, Klopper JP, Cottrill E. The Molecular Heterogeneity of NRAS Variants in Thyroid Nodules. Otolaryngol Head Neck Surg. 2026 Aug; 175(2):343-349. PMID: 42307992.
      View in: PubMed
    4. Castellanos LE, Bryan J, Ricarte-Filho JC, Franco AT, Alshalalfa M, Klopper JP, Kloos RT, Waguespack SG. Afirma genomic sequencing classifier performance in young patients with cytologically indeterminate thyroid nodules. J Clin Endocrinol Metab. 2026 Jun 17; 111(7):1920-1926. PMID: 41678360.
      View in: PubMed
    5. Azad S, Graham TE, Levy S, Velanzuela-Sheker E, Bimston D, Ferenczi A, Chen Y, Alshalalfa M, Hao Y, Klopper JP, Kloos RT, Kotwal A. Analysis of PLEKHS1 promoter mutation in preoperative thyroid nodule samples. Cancer Cytopathol. 2026 05; 134(5):e70103. PMID: 42080574.
      View in: PubMed
    6. Cacala SR, Naidu S, Faro C, Klopper J, Buccimazza I. The spectrum of thyroid disease requiring surgery: a single centre experience in South Africa. S Afr J Surg. 2026 Mar; 64(1):18-22. PMID: 42157759.
      View in: PubMed
    7. Harari A, Huiras J, Chen Y, Alshalalfa M, Hao Y, Klopper JP, Kloos RT, Vazquez BJ. Preoperative Detection of Dual TERT Promoter Mutations in Thyroid Cancer: A Case Series. Diagn Cytopathol. 2026 Apr; 54(4):E108-E112. PMID: 41524254.
      View in: PubMed
    8. Jasim S, Golding A, Bimston D, Alshalalfa M, Chen Y, Jiang R, Hao Y, Huang J, Klopper JP, Kloos RT, Brown TC. Cytologic and Molecular Assessment of Isthmus Thyroid Nodules and Carcinomas. Thyroid. 2025 03; 35(3):255-264. PMID: 39527399.
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    9. Iyer PC, Dadu R, Barque A, Zanelli C, Zheng X, Jiang H, Walsh PS, Hao Y, Huang J, Klopper JP, Kloos RT, Cabanillas M. Analytical Validation of a Telomerase Reverse Transcriptase (TERT) Promoter Mutation Assay. J Clin Endocrinol Metab. 2024 08 13; 109(9):2269-2273. PMID: 38441247.
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    10. Pinto JO, Livhits MJ, Yeh MW, Kaykov A, Klopper JP, Kloos RT, Alshalalfa M, Hao Y, Huang J, Endo M. Histopathology of telomerase reverse transcriptase promoter (TERT) mutated indeterminate thyroid nodules. J Clin Transl Endocrinol. 2024 Mar; 35:100329. PMID: 38116167.
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    11. Sipos JA, Aloi J, Gianoukakis A, Lee SL, Klopper JP, Kung JT, Lupo MA, Morgenstern D, Prat-Knoll C, Schuetzenmeister A, Goldner WS. Thyroglobulin Cutoff Values for Detecting Excellent Response to Therapy in Patients With Differentiated Thyroid Cancer. J Endocr Soc. 2023 Aug 01; 7(9):bvad102. PMID: 37564885.
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    12. Nasr CE, Andrioli M, Endo M, Harrell RM, Livhits MJ, Osakwe I, Polavarapu P, Siperstein A, Wei S, Zheng X, Jiang R, Hao Y, Huang JIN, Klopper JP, Kloos RT, Kennedy G, Angell TE. Real-World Performance of the Afirma Genomic Sequencing Classifier (GSC)-A Meta-analysis. J Clin Endocrinol Metab. 2023 05 17; 108(6):1526-1532. PMID: 36470585.
      View in: PubMed
    13. Patel J, Klopper J, Cottrill EE. Molecular diagnostics in the evaluation of thyroid nodules: Current use and prospective opportunities. Front Endocrinol (Lausanne). 2023; 14:1101410. PMID: 36909304.
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    14. Randolph GW, Sosa JA, Hao Y, Angell TE, Shonka DC, LiVolsi VA, Ladenson PW, Blevins TC, Duh QY, Ghossein R, Harrell M, Patel KN, Shanik MH, Traweek ST, Walsh PS, Yeh MW, Abdelhamid Ahmed AH, Ho AS, Wong RJ, Klopper JP, Huang J, Kennedy GC, Kloos RT, Sadow PM. Preoperative Identification of Medullary Thyroid Carcinoma (MTC): Clinical Validation of the Afirma MTC RNA-Sequencing Classifier. Thyroid. 2022 09; 32(9):1069-1076. PMID: 35793115.
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    15. Sobnach S, Ede C, Van Der Linde G, Klopper J, Thomson S, Bhyat A, Kahn D. A retrospective evaluation of the Modified Alvarado Score for the diagnosis of acute appendicitis in HIV-infected patients. Eur J Trauma Emerg Surg. 2018 Apr; 44(2):259-263. PMID: 28573428.
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    16. Likhterov I, Tuttle RM, Haser GC, Su HK, Bergman D, Alon EE, Bernet V, Brett E, Cobin R, Dewey EH, Doherty G, Dos Reis LL, Klopper J, Lee SL, Lupo MA, Machac J, Mechanick JI, Milas M, Orloff L, Randolph G, Ross DS, Rowe ME, Smallridge R, Terris D, Tufano RP, Urken ML. Improving the adoption of thyroid cancer clinical practice guidelines. Laryngoscope. 2016 11; 126(11):2640-2645. PMID: 27074952.
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    17. Haser GC, Tuttle RM, Su HK, Alon EE, Bergman D, Bernet V, Brett E, Cobin R, Dewey EH, Doherty G, Dos Reis LL, Harris J, Klopper J, Lee SL, Levine RA, Lepore SJ, Likhterov I, Lupo MA, Machac J, Mechanick JI, Mehra S, Milas M, Orloff LA, Randolph G, Revenson TA, Roberts KJ, Ross DS, Rowe ME, Smallridge RC, Terris D, Tufano RP, Urken ML. ACTIVE SURVEILLANCE FOR PAPILLARY THYROID MICROCARCINOMA: NEW CHALLENGES AND OPPORTUNITIES FOR THE HEALTH CARE SYSTEM. Endocr Pract. 2016 May; 22(5):602-11. PMID: 26799628.
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    18. Albuja-Cruz MB, Pozdeyev N, Robbins S, Chandramouli R, Raeburn CD, Klopper J, Haugen BR, McIntyre R. A "safe and effective" protocol for management of post-thyroidectomy hypocalcemia. Am J Surg. 2015 Dec; 210(6):1162-8; discussion 1168-9. PMID: 26601651.
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    19. Patel NU, McKinney K, Kreidler SM, Bieker TM, Russ P, Roberts K, Glueck DH, Albuja-Cruz M, Klopper J, Haugen BR. Ultrasound-based clinical prediction rule model for detecting papillary thyroid cancer in cervical lymph nodes: A pilot study. J Clin Ultrasound. 2016 Mar-Apr; 44(3):143-51. PMID: 26402153.
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    20. Klopper J, Kane M, Jimeno A, Sams S, French J, Pike L, Tompkins K, Haugen B. A Phase II Trial of Bexarotene for Advanced Differentiated Thyroid Cancer. Thyroid. 2015 May; 25(5):563-4. PMID: 25778496.
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    21. Mehra S, Tuttle RM, Milas M, Orloff L, Bergman D, Bernet V, Brett E, Cobin R, Doherty G, Judson BL, Klopper J, Lee S, Lupo M, Machac J, Mechanick JI, Randolph G, Ross DS, Smallridge R, Terris D, Tufano R, Alon E, Clain J, DosReis L, Scherl S, Urken ML. Database and registry research in thyroid cancer: striving for a new and improved national thyroid cancer database. Thyroid. 2015 Feb; 25(2):157-68. PMID: 25517683.
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    22. Dos Reis LL, Tuttle RM, Alon E, Bergman DA, Bernet V, Brett EM, Cobin R, Doherty G, Harris JR, Klopper J, Lee SL, Lupo M, Milas M, Machac J, Mechanick JI, Orloff L, Randolph G, Ross DS, Smallridge RC, Terris DJ, Tufano RP, Mehra S, Scherl S, Clain JB, Urken ML. What is the gold standard for comprehensive interinstitutional communication of perioperative information for thyroid cancer patients? A comparison of existing electronic health records with the current American Thyroid Association recommendations. Thyroid. 2014 Oct; 24(10):1466-72. PMID: 25036190.
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    23. Urken ML, Milas M, Randolph GW, Tufano R, Bergman D, Bernet V, Brett EM, Brierley JD, Cobin R, Doherty G, Klopper J, Lee S, Machac J, Mechanick JI, Orloff LA, Ross D, Smallridge RC, Terris DJ, Clain JB, Tuttle M. Management of recurrent and persistent metastatic lymph nodes in well-differentiated thyroid cancer: a multifactorial decision-making guide for the Thyroid Cancer Care Collaborative. Head Neck. 2015 Apr; 37(4):605-14. PMID: 24436291.
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    24. Mehra S, Tuttle RM, Bergman D, Bernet V, Brett E, Cobin R, Doherty G, Klopper J, Lee S, Machac J, Milas M, Mechanick JI, Orloff L, Randolph G, Ross DS, Smallridge R, Terris D, Tufano R, Alon E, Clain J, Dos Reis L, Scherl S, Urken ML. Improving the quality of thyroid cancer care: how does the Thyroid Cancer Care Collaborative cross the Institute of Medicine's Quality Chasm? Thyroid. 2014 Apr; 24(4):615-24. PMID: 24512449.
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    25. Alexander EK, Schorr M, Klopper J, Kim C, Sipos J, Nabhan F, Parker C, Steward DL, Mandel SJ, Haugen BR. Multicenter clinical experience with the Afirma gene expression classifier. J Clin Endocrinol Metab. 2014 Jan; 99(1):119-25. PMID: 24152684.
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    26. Smallridge RC, Copland JA, Brose MS, Wadsworth JT, Houvras Y, Menefee ME, Bible KC, Shah MH, Gramza AW, Klopper JP, Marlow LA, Heckman MG, Von Roemeling R. Efatutazone, an oral PPAR-? agonist, in combination with paclitaxel in anaplastic thyroid cancer: results of a multicenter phase 1 trial. J Clin Endocrinol Metab. 2013 Jun; 98(6):2392-400. PMID: 23589525.
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    27. Duick DS, Klopper JP, Diggans JC, Friedman L, Kennedy GC, Lanman RB, McIver B. The impact of benign gene expression classifier test results on the endocrinologist-patient decision to operate on patients with thyroid nodules with indeterminate fine-needle aspiration cytopathology. Thyroid. 2012 Oct; 22(10):996-1001. PMID: 22873825.
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    28. French JD, Kotnis GR, Said S, Raeburn CD, McIntyre RC, Klopper JP, Haugen BR. Programmed death-1+ T cells and regulatory T cells are enriched in tumor-involved lymph nodes and associated with aggressive features in papillary thyroid cancer. J Clin Endocrinol Metab. 2012 Jun; 97(6):E934-43. PMID: 22466343.
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    29. Howard D, La Rosa FG, Huang S, Salvatore D, Mulcahey M, Sang-Lee J, Wachs M, Klopper JP. Consumptive hypothyroidism resulting from hepatic vascular tumors in an athyreotic adult. J Clin Endocrinol Metab. 2011 Jul; 96(7):1966-70. PMID: 21508133.
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    30. Sharma V, Fretwell D, Crees Z, Kerege A, Klopper JP. Thyroid cancer resistance to vitamin D receptor activation is associated with 24-hydroxylase levels but not the ff FokI polymorphism. Thyroid. 2010 Oct; 20(10):1103-11. PMID: 20860424.
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    31. French JD, Weber ZJ, Fretwell DL, Said S, Klopper JP, Haugen BR. Tumor-associated lymphocytes and increased FoxP3+ regulatory T cell frequency correlate with more aggressive papillary thyroid cancer. J Clin Endocrinol Metab. 2010 May; 95(5):2325-33. PMID: 20207826.
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    32. Klopper JP, Sharma V, Bissonnette R, Haugen BR. Combination PPARgamma and RXR Agonist Treatment in Melanoma Cells: Functional Importance of S100A2. PPAR Res. 2010; 2010:729876. PMID: 19859558.
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    33. Nikiforov YE, Steward DL, Robinson-Smith TM, Haugen BR, Klopper JP, Zhu Z, Fagin JA, Falciglia M, Weber K, Nikiforova MN. Molecular testing for mutations in improving the fine-needle aspiration diagnosis of thyroid nodules. J Clin Endocrinol Metab. 2009 Jun; 94(6):2092-8. PMID: 19318445.
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    34. Klopper JP, Sharma V, Berenz A, Hays WR, Loi M, Pugazhenthi U, Said S, Haugen BR. Retinoid and thiazolidinedione therapies in melanoma: an analysis of differential response based on nuclear hormone receptor expression. Mol Cancer. 2009 Mar 06; 8:16. PMID: 19267912.
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    35. Schweppe RE, Klopper JP, Korch C, Pugazhenthi U, Benezra M, Knauf JA, Fagin JA, Marlow LA, Copland JA, Smallridge RC, Haugen BR. Deoxyribonucleic acid profiling analysis of 40 human thyroid cancer cell lines reveals cross-contamination resulting in cell line redundancy and misidentification. J Clin Endocrinol Metab. 2008 Nov; 93(11):4331-41. PMID: 18713817.
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    36. Klopper J, Haugen B. Can calcitonin and carcinoembryonic antigen doubling times predict progression of thyroid carcinoma? Nat Clin Pract Endocrinol Metab. 2008 Aug; 4(8):428-9. PMID: 18542112.
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    37. Klopper JP, Berenz A, Hays WR, Sharma V, Pugazhenthi U, Janssen J, Singh M, Bissonnette RP, Haugen BR. In vivo and microarray analysis of rexinoid-responsive anaplastic thyroid carcinoma. Clin Cancer Res. 2008 Jan 15; 14(2):589-96. PMID: 18223235.
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    38. Klopper JP, McDermott MT. Palpable pediatric thyroid abnormalities - diagnostic pitfalls necessitate a high index of clinical suspicion: a case report. J Med Case Rep. 2007 Jun 22; 1:29. PMID: 17587454.
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    39. Copland JA, Marlow LA, Kurakata S, Fujiwara K, Wong AK, Kreinest PA, Williams SF, Haugen BR, Klopper JP, Smallridge RC. Novel high-affinity PPARgamma agonist alone and in combination with paclitaxel inhibits human anaplastic thyroid carcinoma tumor growth via p21WAF1/CIP1. Oncogene. 2006 Apr 13; 25(16):2304-17. PMID: 16331265.
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    40. Klopper JP, Hays WR, Sharma V, Baumbusch MA, Hershman JM, Haugen BR. Retinoid X receptor-gamma and peroxisome proliferator-activated receptor-gamma expression predicts thyroid carcinoma cell response to retinoid and thiazolidinedione treatment. Mol Cancer Ther. 2004 Aug; 3(8):1011-20. PMID: 15299084.
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    41. Haugen BR, Larson LL, Pugazhenthi U, Hays WR, Klopper JP, Kramer CA, Sharma V. Retinoic acid and retinoid X receptors are differentially expressed in thyroid cancer and thyroid carcinoma cell lines and predict response to treatment with retinoids. J Clin Endocrinol Metab. 2004 Jan; 89(1):272-80. PMID: 14715861.
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    42. Rubow S, Klopper J. Excretion of radioiodine in human milk following a therapeutic dose of I-131. Eur J Nucl Med. 1988; 14(12):632-3. PMID: 3243311.
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