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Thyroid cancer (TC) is the eighth most frequently diagnosed cancer worldwide with a rising incidence in the past 20 years. Surgery is the primary strategy of therapy for patients with medullary TC (MTC) and differentiated TC (DTC). In DTC patients, radioactive iodine (RAI) is administered after thyroidectomy. Neck ultrasound, basal and thyroid-stimulating hormone-stimulated thyroglobulin are generally performed every three to six months for the first year, with subsequent intervals depending on initial risk assessment, for the detection of possible persistent/recurrent disease during the follow up. Distant metastases are present at the diagnosis in ∼5 % of DTC patients; up to 15 % of patients have recurrences during the follow up, with a survival reduction (70 %–50 %) at 10-year. During tumor progression, the iodide uptake capability of DTC cancer cells can be lost, making them refractory to RAI, with a negative impact on the prognosis. Significant advances have been done recently in our understanding of the molecular pathways implicated in the progression of TCs. Several drugs have been developed, which inhibit signaling kinases or oncogenic kinases (BRAFV600E, RET/PTC), such as those associated with Platelet-Derived Growth Factor Receptor and Vascular Endothelial Growth Factor Receptor. Tyrosine kinase receptors are involved in cancer cell proliferation, angiogenesis, and lymphangiogenesis. Several tyrosine kinase inhibitors (TKIs) are emerging as new treatments for DTC, MTC and anaplastic TC (ATC), and can induce a clinical response and stabilize the disease. Lenvatinib and sorafenib reached the approval for RAI-refractory DTC, whereas cabozantinib and vandetanib for MTC. These TKIs extend median progression-free survival, but do not increase the overall survival. Severe side effects and drug resistance can develop in TC patients treated with TKIs. Additional studies are needed to identify a potential effective targeted therapy for aggressive TCs, according to their molecular characterization.

Purpose of review Systemic treatment is the only therapeutic option for patients with progressive, metastatic medullary thyroid cancer (MTC). Since the discovery of the rearranged during transfection (RET) proto-oncogene (100% hereditary, 60-90% sporadic MTC), research has focused on finding effective systemic therapies to target this mutation. This review surveys recent findings. Recent findings Multikinase inhibitors are systemic agents targeting angiogenesis, inhibiting growth of tumor cells and cells in the tumor environment and healthy endothelium. In the phase III EXAM and ZETA trials, cabozantinib and vandetanib showed progression-free survival benefit, without evidence of prolonged overall survival. Selpercatinib and pralsetinib are kinase inhibitors with high specificity for RET; phase I and II studies showed overall response rates of 73% and 71% in first line, and 69% and 60% in second line treatment, respectively. Although resistance mechanisms to mutation-driven therapy will be a challenge in the future, phase III studies are ongoing and neo-adjuvant therapy with selpercatinib is being studied. Summary The development of selective RET-inhibitors has expanded the therapeutic arsenal to control tumor growth in progressive MTC, with fewer adverse effects than multikinase inhibitors. Future studies should confirm their effectiveness, study neo-adjuvant strategies, and tackle resistance to these inhibitors, ultimately to improve patient outcomes.

Background Medullary thyroid cancer is a neuroendocrine malignancy that can occur sporadically or as the result of genomic rearranged during transfection mutations. Medullary thyroid cancer has a higher rate of metastasis than well-differentiated thyroid cancer. Lateral neck dissection is often performed, and its prophylactic use is controversial. Methods Single-center, retrospective review (2000–2017) of patients undergoing primary surgical treatment for medullary thyroid cancer who had negative lateral neck imaging preoperatively. Demographics, genetic associations, clinical, and imaging findings were analyzed. Locoregional recurrence, overall recurrence, and overall survival were examined. Results A total of 110 patients were identified, of which 18 underwent prophylactic lateral neck dissection and 92 did not. Age, sex distribution, preoperative calcitonin levels, and follow-up were similar among groups. Overall recurrence was 20% for no prophylactic lateral neck dissection and 39% for prophylactic lateral neck dissection (P = .46). Most recurrences were locoregional recurrence, 7.6% for no prophylactic lateral neck dissection versus 22% for prophylactic lateral neck dissection (P = .08), half of it being to the lateral neck in both groups. A total of 7 patients from the no prophylactic lateral neck dissection group required treatment for recurrences versus 4 patients in prophylactic lateral neck dissection group (P = .57). Overall survival at 5 years was similar, 43% the no prophylactic lateral neck dissection group and 31% for prophylactic lateral neck dissection group (P = .52). Conclusion Lateral neck dissection has no effect in decreasing locoregional or overall recurrences in medullary thyroid cancer and has no effect in overall survival when performed prophylactically at index surgical intervention.

Purpose Marital status has emerged as an important influence on several cancer outcomes, but its role in medullary thyroid cancer (MTC) remains unclear. This study was to explore the effects of marital status on the prognosis of MTC patients and to determine whether its effects vary by age. Patients and methods We retrospectively extracted 1344 eligible patients diagnosed with MTC between 2004 and 2015 from the Surveillance, Epidemiology, and End Results (SEER) database. Based on the marital status, we divided those patients into married and unmarried groups. We compared the difference in overall survival (OS) and cancer‐specific survival (CSS) between married and unmarried via the Kaplan–Meier analysis. Univariate and multivariate Cox proportional models were performed to identify the prognostic factors of OS and CSS. Results There were 1344 MTC eligible patients in a total of which 883 (65.7%) were married and 461 (34.3%) were unmarried. The comparison observed between married and unmarried patients was as follows: male (45.2% vs. 28.0%), age (≥52 years) (55.9% vs. 44.6%), White (86.7% vs. 78.7%), and undergo surgery (97.7% vs. 93.3%). Multivariate analysis revealed unmarried status as a risk factor independently associated with worse OS (HR: 2.15, 95% CI: 1.59–2.92) rate and CSS (HR: 1.70, 95% CI: 1.17–2.47) rate. In a further analysis stratified by age, there was no significant difference in OS and CSS between married and unmarried patients younger than 52 years. For the remaining group with 52 years old and higher, unmarried patients showed significantly higher risk of OS and CSS than married patients at all stages of the pathology except M1 stage. Conclusion Married patients with MTC have a better prognosis than unmarried ones. Age can affect the association between marital status and the survival of MTC, and married elders may benefit more than youngers., Married patients with MTC have a better prognosis than unmarried ones. Age can affect the association between marital status and the survival of MTC, and married elders may benefit more than youngers.

Was ist neu? Diagnose und Prognose Calcitonin ist ein sensitiver und spezifischer Tumormarker zur Früherkennung und Verlaufskontrolle des MTC. Daneben kommt dem Ultraschall der Schilddrüse eine entscheidende Rolle zu. Rolle des RET-Proto-Onkogens Das medulläre Schilddrüsenkarzinom (MTC) nimmt seinen Ursprung aus den parafollikulären Calcitonin-produzierenden C-Zellen. Es macht nur ca. 3–8 % aller Schilddrüsenkarzinome aus. Aktivierende Mutationen im RET (rearranged during transfection)-Gen liegen bei etwa 25 % der Patienten in der Keimbahn vor, werden aber auch beim sporadischen MTC als somatische Mutationen in ca. 60 % der Fälle beobachtet. Bei metastasierter Erkrankung findet sich in 90 % eine RET-Mutation. RET-Mutationen gelten als Treibermutationen und schließen weitere Treibermutationen weitestgehend aus. Seltener sind somatische Mutationen der RAS-Gene. Chirurgische Therapie Die chirurgische Resektion ist bis heute der einzige kurative Therapieansatz. Entscheidend für eine frühzeitige Diagnosestellung ist die Bestimmung des Serum-Calcitonins bei Nachweis von Schilddrüsenknoten. Die chirurgische Therapie steht auch bei der Behandlung lokoregionärer Rezidive oder lokal angehbarer Metastasen im Zentrum. Systemtherapie Bei irresektabel fortgeschrittener und progredienter Erkrankung mit signifikanter Tumorlast kann eine systemische Therapie erforderlich werden. Neuerdings ist die Kenntnis einer RET-Mutation im Tumorgewebe therapeutisch relevant, da mit den selektiven RET-Inhibitoren Selpercatinib und zukünftig Pralsetinib neue, effektive und gut verträgliche Systemtherapien zur Verfügung stehen. Ihr Einsatz ist nach Vortherapie mit einem der Multityrosinkinase-Inhibitoren Vandetanib oder Cabozantinib zugelassen und wird derzeit in der Erstlinientherapie in klinischen Studien untersucht.

To study the clinical, biochemical characteristics, treatment results and follow-up of patients with ectopic ACTH syndrome EAS (ACTH adrenocorticotropic hormone ).A retrospective, observational, single-center study of 130 patients with EAS. Demographic information of patients, medical history, results of laboratory and instrumental investigations at the pre- and postoperative stages and follow-up of EAS were analyzed.The mean age at the diagnosis ranged from 12 to 74 years (Me 40 years [28; 54]). The duration of the disease from the onset of symptoms to the verification of the diagnosis varied from 2 to 168 months (Me 17.5 months [7; 46]). Eighty-one (62,3%) patients had bronchopulmonary NET, 9 thymic carcinoid, 7 pancreatic NET, 5 pheochromocytoma, 1 cecum NET, 1 appendix carcinoid tumor, 1 medullary thyroid cancer and 25 (19.2%) had an occult source of ACTH. The median follow-up period of patients was 27 months [9.75; 61.0] with a maximum follow-up of 372 months. Currently, primary tumor was removed in 82 (63.1%) patients, bilateral adrenalectomy was performed in 23 (18%) patients, in 16 of them there was an occult source of ACTH-producing NET and in 7 patients in order to control hypercortisolism after non-successful surgical treatment. Regional and distant metastases were revealed in 25 (19.2%) patients. At the time of the last observation 59 (72%) patients were exhibited a full recovery, 12 (14.6%) had relapse of the disease and 26 (20%) died from multiple organ failure (n=18), pulmonary embolism (n=4), surgical complications (n=2), disseminated intravascular coagulation syndrome (n=1) or COVID-19 (n=1).In our cohort of patients bronchopulmonary NET are the most frequent cause of EAS (62.3%). Surgical treatment leads to remission of hypercortisolism in 72% cases; the proportion of relapse (14.6%) and fatal outcome (20%) remains frequent in EAS.Цель. Изучить клинико-лабораторные характеристики и отдаленные результаты лечения когорты больных с АКТГ-эктопированным синдромом АКТГ-ЭС (АКТГ адренокортикотропный гормон). Материалы и методы. Проведено ретроспективное обсервационное одноцентровое одномоментное исследование 130 пациентов с АКТГ-ЭС. Проанализированы демографические сведения о пациентах, данные анамнеза, результаты гормональных и инструментальных исследований на до- и послеоперационном этапах, отдаленные результаты лечения. Результаты. Возраст на момент диагностики заболевания составил от 12 до 74 лет (Ме 40 лет [28; 54]). Длительность заболевания с момента появления симптомов до верификации диагноза от 2 до 168 мес (Ме 17,5 мес [7; 46]). В 81 (62,3%) случае первичный очаг локализовался в легком, в 9 в средостении, в 7 в поджелудочной железе, в 5 в надпочечнике, по 1 случаю в слепой кишке и червеобразном отростке, у 1 пациента причиной АКТГ-ЭС оказался медуллярный рак щитовидной железы, в 25 (19,2%) случаях установить локализацию нейроэндокринной опухоли (НЭО) не удалось. Медиана периода наблюдения составила 27 мес [9,75; 61,0], максимально 372 мес. Первичный очаг удален у 82 (63,1%) больных, двусторонняя адреналэктомия по жизненным показаниям выполнена 23 (17,7%) пациентам, из них 16 с НЭО неустановленной локализации, 7 с целью контроля тяжелого течения гиперкортицизма после нерадикального хирургического лечения. Метастазы выявлены у 25 (19,2%). На момент последнего наблюдения 59 (72%) пациентов в ремиссии заболевания, у 12 (14,6%) развился рецидив, 26 (20%) умерли от полиорганной недостаточности (n=18), тромбоэмболии легочной артерии (n=4), осложнений хирургического вмешательства (n=2), синдрома диссеминированного внутрисосудистого свертывания (n=1), COVID-19 (n=1). Заключение. Наиболее частым источником АКТГ-ЭС являются НЭО бронхолегочной локализации (62,3%). Радикальное хирургическое лечение в большинстве случаев позволяет добиться стойкой ремиссии заболевания (72%), однако частота летальности (20%) и рецидивов заболевания (14,6%) остается высокой.

Background: Medullary thyroid carcinoma (MTC) is a rare neuro-endocrine tumor that arises from the C-cells of the thyroid. About 20- 25 % of MTC cases may be associated with hereditary syndromes like MEN 2A, MEN 2B and Familial MTC. The survival rate is related mainly to the age of the patient, stage of the disease and completion of the surgical resection. Methods: Retrospective review of 11 patients who were diagnosed with medullary thyroid cancer in our general surgery department during the period from 2011 to 2021. All patients had preoperative assessment including history taking, clinical examination, tumor marker (calcitonin and CEA), thyroid function testing, ultrasonography and FNAC. All patients underwent genetic assessment to exclude any underlying genetic mutation. Results: The mean age of diagnosis was 57.73 ± 16.45 years of age. Three patients were males and eight were females. All patients had total thyroidectomy, central and lateral neck dissection except one patient who had prophylactic thyroidectomy due to familial inherited RET mutation. Two patients had recurrence; both of them had high-stage tumor (T3 and T4) with multiple cervical lymph nodes metastasis. The sensitivity of serum calcitonin for the detection of MTC was about 98%. Patients, who had localized disease and underwent complete surgical resection, had good overall survival rates compared with patients with advanced disease. Conclusion: MTC represent a heterogeneous group of thyroid cancers. The overall survival is better than that of undifferentiated thyroid cancers. Complete resection of the thyroid tumor and any local or regional metastases provides the only cure for patients with MTC. Further researches are still needed to improve our understanding and management of MTC.

The metastatic risk profile of microscopic lymphatic and venous invasion in medullary thyroid cancer is ill-defined. This evidence gap calls for evaluation of the suitability of microscopic lymphatic and venous invasion at thyroidectomy for prediction of lymph node and distant metastases in medullary thyroid cancer. In this study of 484 patients with medullary thyroid cancer who had≥5 lymph nodes removed at initial thyroidectomy, microscopic lymphatic and venous invasion were significantly associated with greater primary tumor size (27.6 vs. 14.5 mm, and 30.8 vs. 16.2 mm) and more frequent lymph node metastasis (97.0 vs. 25.9%, and 85.2 vs. 39.5%) and distant metastasis (25.0 vs. 5.1%, and 32.8 vs. 7.3%). Prediction of lymph node metastases by microscopic lymphatic invasion was better than prediction of distant metastases by microscopic venous invasion regarding sensitivity (97.0 vs. 32.8%) and positive predictive value (58.4 vs. 39.2%); comparable regarding negative predictive value (98.5 vs. 90.5%) and accuracy (80.4 vs. 85.1%); and worse regarding specificity (74.1 vs. 92.7%). On multivariable logistic regression, microscopic lymphatic invasion predicted lymph node metastasis better (odds ratio [OR] 65.6) than primary tumor size (OR 4.6 for tumors>40 mm and OR 2.7 for tumors 21–40 mm, relative to tumors≤20 mm), whereas primary tumor size was better in predicting distant metastasis (OR 8.3 for tumors>40 mm and OR 3.9 for tumors 21–40 mm, relative to tumors≤20 mm) than microscopic venous invasion (OR 3.2). These data show that lymphatic invasion predicts lymph node metastases better in medullary thyroid cancer than venous invasion heralds distant metastases.

Multiple endocrine neoplasia (MEN) describes the occurrence of tumours affecting two or more endocrine glands in one patient. Two main forms are recognized: MEN type 1 (MEN1) and type 2 (MEN2). MEN1 is characterized by the combined occurrence of parathyroid, pituitary and pancreatic neuroendocrine tumours, whereas MEN2 features medullary thyroid cancer in association with phaeochromocytoma and parathyroid tumours. Although both MEN1 and MEN2 are autosomal dominant disorders, they have contrasting molecular aetiologies: MEN1 results from inactivating germline mutations of the MEN1 tumour suppressor gene, whereas MEN2 results from activating mutations in the RET proto-oncogene. The clinical features arising in each condition relate to the location of tumour development and/or hormonal hypersecretion, while treatment approaches aim to minimize morbidity and mortality, and preserve quality of life. Genetic testing is a key component of management, not only to confirm the diagnosis in affected patients, but also to identify family members who are at risk of disease but may be asymptomatic. It is recommended that patients ‘at risk' of developing MEN1 and MEN2 (i.e. mutation carriers) undergo periodic clinical, biochemical and radiological surveillance to enable the early identification and/or treatment of tumours. Here, a brief overview of MEN1 and MEN2 is provided.

Objectives: During this ongoing pandemic of coronavirus disease 2019 (COVID-19), procalcitonin (PCT) assay has proven to be a useful tool in assisting clinicians to diagnose bacterial superinfection. However, in the absence of signs of infection or at resolution thereof, inappropriately and persistently high PCT may suggest and reveal the presence of other pathologies. We report a patient with acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pneumonia in whom persistence of initially elevated PCT during recovery prompted the diagnosis of medullary thyroid cancer (MTC). Case report: A 43- year-old man presented with a two-day history of fever, sneezing, sore throat and dry cough. Physical exam revealed decreased sounds and coarse crackles in both lung bases at auscultation. Medical history was positive for cognitive impairment since birth, arterial hypertension, systemic lupus erythematosus with nephritis. Initial studies included mild lymphocytopenia 650/µl (760 - 5000), D-Dimer 0.73 µg/ml (< 0.5), C reactive protein (CRP) of 62 mg/l (< 5) and PCT of 94 ng/ml (0.00 - 0.10). Positivity for SARS-Cov-2 RNA was detected and chest computerized tomography showed bilateral ground-glass opacities in the basilar lung zones and hyperdense and irregular foci in the thoracic vertebral bodies. Empirical antibiotic therapy was started and was maintained for seven days but, despite clinical improvement and the normalization of CRP, serum PCT was persistently high (84 ng/ml). Serum calcitonin (CTN) was 2120 pg/ml (normal up to 12 pg/ml). Neck ultrasound revealed inhomogeneously echogenic lymph nodes with small punctate calcifications and a non-homogeneous thyroid with multiple nodules. Cytological examination by fine needle aspiration and CTN measurement on washing liquid confirmed the suspicion of MTC. The patient underwent total thyroidectomy with bilateral cervical lymph node dissection. Histological analysis confirmed MTC of right thyroid lobe and metastasis at lymph nodes of the central right midneck area. Blood tests performed 48 hours after surgery showed a lowering of CTN (986 pg/mL) and PCT (16 ng/mL). A 6-months follow up showed persistent increased CTN and PCT levels (921 pg/ml and 16 ng/ml, respectively) while a (18)F-fluorodihydro-xyphenylalanine ((18)F-DOPA) PET did not reveal any suspicious fixations at thyroid lodge and cervical lymph node stations while multiple osteoblastic foci in the skeletal area were described. A close follow-up was planned with establishment of the results of RET gene analysis. Discussion: Although CTN is the gold standard biochemical parameter for the diagnosis and follow-up of MTC, PCT can be useful as a biochemical marker of MTC suspicion in patients with inflammatory conditions and persistently elevated PCT even after resolution. In the present CASE, high levels of PCT in a patient with Covid-19 pneumonia without signs of bacterial infection, allowed to diagnose MCT. Conclusion: In the absence of any other signs of infection, a complete clinical assessment, including neck palpation, CTN measurement and thyroid ultrasound should be performed in the presence of persistently elevated PCT.

The discovery of a pivotal role of tyrosine kinases in the pathogenesis of medullary thyroid carcinoma (MTC) opened up new options in the systemic treatment of advanced disease. During the last dec...

Abstract The role of radiotherapy in advanced medullary thyroid carcinoma (MTC) is confined to patients in whom surgical treatment or the administration of tyrosine kinase inhibitors are not possible or contraindicated. High fractionated radiation doses during radiosurgery or fractionated stereotactic radiotherapy are applied to reduce cancer-related symptoms and stabilize irradiated lesions. This study aimed to retrospectively evaluate the therapeutic effect of stereotactic radiotherapy in MTC patients. Material and methods The study group involved 11 MTC patients, treated due to 16 cancer lesions, mainly bone metastases (10 lesions), lymph node (2 lesions) metastases, or liver metastases (2 lesions), one primary thyroid tumor, and one MTC recurrence in the thyroid bed. The fractionated and total radiation doses ranged between 5 and 12 Gy and 8–44 Gy, respectively. Six lesions were treated with a single radiation fraction, three lesions with 2 fractions, another 6 lesions with 3 fractions, whereas the remaining one metastatic lesion with 9 fractions of stereotactic radiosurgery. Results The beneficial effect of stereotactic radiosurgery was obtained in all treated lesions. None of treated lesions progressed in the further disease course. Fourteen lesions were stable (87.5 %), including eight lesions showing progression before radiosurgery (good response). Disease control was obtained in all soft-tissue metastases. Regarding bone metastases, partial regression was achieved in 20 % lesions, whereas in 30 % lesions progressive before radiotherapy, the treatment led to disease stabilization. Conclusions Our data pointed to the effectiveness of high-dose fractionated radiotherapy in MTC. However, an observation of a larger group of patients is required to confirm it.

Aim. The research aims at analyzing the main changes in classification of medullary thyroid cancer and outlining the principles of staging according to modern studies. Material and Methods. Specific scientific articles for the period of 2009-2019 referring to the principles and rules of the TNM classification process, as well as recommendations of the TNM committees of the American Joint Committee on Cancer (AJCC) and the International Union Against Cancer (IUAC) were selected for the analysis. The basic principles of classification and staging for 8th edition of TNM, as well as changes that have taken place in comparison with 7th edition of TNM It were defined. Results and Discussion. Medullary thyroid cancer accounts for 1-2 percent in the structure of cancers of the thyroid gland, however it is associated with a high mortality rate compared to highly differentiated forms of thyroid cancer. The main radical method of treatment is an adequate volume of surgical intervention, which is determined on the basis of proper staging, the use of visualization methods and the practical experience of doctors. The 7th edition of the TNM was introduced to the scientific society in 2009. It has been 10 years since a new version of the 8th edition based on the new data in evidence-based medicine appeared. It included numerous changes and additions, namely for medullary thyroid cancer. The following research suggests a detailed review and analysis of the basic principles of the staging and classification of medullary thyroid cancer for AJCC TNM-8 in order to improve the diagnosis and treatment of patients with the mentioned above disease. Conclusions. The use of modern principles of classification and staging of medullary thyroid cancer in clinical practice promotes choosing the adequate treatment method and estimating the patient's prognosis. In addition, further improvement of the staging system by TNM-committee and cancer registers depends on the presence of detailed information on additional "parameters for collection and further evaluation" in medical documentation.

The article reviews domestic and foreign literature on the use of radiation therapy in the treatment of medullary thyroid cancer. The possibilities of various radiation methods in the treatment of patients with distant metastases are shown. In addition to classical types of remote irradiation, data are presented on the possibilities of radionuclide therapy (peptide-receptor therapy with somatostatin analogs and radionuclide therapy with osteotropic drugs for bone metastases). Methods of combined therapy with the use of osteomodifying agents, targeted drugs and other methods are described, which make it possible to increase the effectiveness of treatment of patients with medullary thyroid cancer with bone metastases.

Medullary thyroid carcinomas make up 9,4% of all cancers of the thyroid gland [1]. We can divide them into sporadic and familial form. Sporadic forms are most common. The rest of medullary thyroid carcinomas are familial forms which in most cases are associated with MEN2a and MEN2b syndromes. If neoplasm is associated with MEN2a or MEN2b syndromes, other tumors can occur: pheochromocytoma or adenomas of parathyroids glands. Medullary thyroid carcinoma typically occurs as a solid tumor in the thyroid region of the neck. It can produce also: pain in thyroid region, dysphagia, hoarseness, cervical lymphadenopathy. These symptoms are caused by infiltration of adjacent tissues by neoplasm and by metastases to cervical lymph nodes. It is very rare that there is no tumor in the thyroid region, when a patient complains about signs associated with infiltration of the tumor, but in some cases lymphadenopathy can be the first sign of medullary thyroid carcinoma [2]. Rarer than that there is no tumor in thyroid gland visualized in CT scans when there are signs of cervical lymphadenopathy. In this case report we present the patient with metastases of the medullary thyroid carcinoma to the neck and no other findings in physical examination and additional testing.

PET imaging with F-18 DOPA (FDOPA) and Ga-68 DOTATATE (TATE) shows the most promising results to detect medullary thyroid cancer (MTC) recurrence. We performed this comparative study to detect the site of recurrent or metastatic disease in MTC patients with elevated serum calcitonin (Ctn) and/or carcinoembryonic antigen (CEA) levels. We studied 46 MTC patients (25 women, 21 men) with elevated Ctn and/or CEA levels during follow-up who had both FDOPA and TATE PET/CT scans for re-staging purposes. FDOPA PET imaging yielded an overall sensitivity of 86.8%, specificity of 100%, PPV of 100%, NPV of 61.5%, and accuracy of 89.1%, while TATE PET scan had the same values as 84.2%, 87.5%, 96.9%, 53.8%, and 84.6%, respectively, and there was no statistically significant difference between the two modalities with the exception of the specificity value that was higher for FDOPA imaging. In a subgroup of patients with overt Ctn or CEA elevation, sensitivity of FDOPA increased significantly, whereas TATE sensitivity did not change. FDOPA PET imaging was significantly superior in detecting liver and regional lymph node (LN) metastases, while TATE PET scan was significantly better in the skeletal metastases. Early FDOPA demonstrated 11 invisible lesions on late FDOPA. Both FDOPA and TATE PET/CT imaging are useful to localize recurrences in MTC patients. While TATE imaging is superior to reveal skeletal disease, FDOPA seems better in liver and regional LN metastases; therefore, the two modalities appear complementary in monitoring MTC patients with elevated serum Ctn and/or CEA levels.

Background Medullary thyroid cancer (MTC) represents 13.4 % of all thyroid cancers-related deaths. The treatments for MTC are very limited especially for patients with distal metastasis. Therefore, it is critical to understand the mechanisms of MTC to pursue novel therapeutic avenues. Here, we studied the function of circPVT1/miR-455-5p in MTC. Methods Human MTC tissues and cell lines were used. qRT-PCR and Western blotting were employed to measure expression levels of miR-455-5p, circPVT1, CXCL12, and epithelial mesenchymal transformation (EMT)-related proteins. Colony formation assay, flow cytometry, transwell assay, and scratch wound healing assay were used to assess the abilities of cell proliferation, apoptosis, migration and invasion, respectively. Dual luciferase assay and RNA immunoprecipitation were employed to validate interactions of circPVT1/miR-455-5p and miR-455-5p/CXCL12. Nude mouse xenograft model was used to evaluate the effects of shcircPVT1 and miR-455-5p mimics on tumor growth and metastasis in vivo. Results miR-455-5p was reduced in MTC tissues and cells while circPVT1 was elevated. Their levels were correlated with prognosis of MTC. Overexpression of miR-455-5p or sh-circPVT1 suppressed EMT and MTC cell proliferation, migration and invasion. miR-455-5p targeted CXCL12 while circPVT1 sponged miR-455-5p. Knockdown of CXCL12 or CXCL12/CXCR4 signaling inhibitor reversed the effects of circPVT1 overexpression or miR-455-5p inhibitor on EMT and MTC cell proliferation, migration and invasion. Knockdown of circPVT1 or miR-455-5p overexpression repressed MTC tumor growth and lung metastasis in vivo. Conclusions miR-455-5p suppresses MTC growth and metastasis by targeting CXCL12/CXCR4 signaling pathway while circPVT1 promotes MTC by sponging miR-455-5p. Our study sheds light on the mechanisms of MTC growth and metastasis.

Objectives We initiate this comprehensive review to update the advances in this field by objectively elucidating the efficacies of promising radiopharmaceuticals. Methods We performed a comprehensive PUBMED search using the combined terms of “thyroid cancer” and “radiopharmaceuticals” or “nuclear medicine”, yielding 3273 and 11026 articles prior to December 31, 2020, respectively. Results Based on the mechanism of molecular metabolism, the evaluation of differentiated thyroid cancer and dedifferentiated thyroid cancer is largely centered around radioiodine and fluorine 18 (18F)-fludeoxyglucose, respectively. Further, 18F-L-dihydroxyphenylalanine and gallium 68 DOTATATE are the preferred tracers for medullary thyroid cancer. In dedifferentiated medullary thyroid cancer and anaplastic thyroid cancer, 18F-fludeoxyglucose is superior. Conclusions The future lies in advances in molecular biology, novel radiopharmaceuticals and imaging devices, paving ways to the development of personalized medication for thyroid cancer patients.

Objective Medullary thyroid cancer (MTC) originates from parafollicular cells (C cell) and produces calcitonin (CT). Basal serum CT was used in the diagnosis and treatment of MTC. If basal CT level is 100 pg/ml or higher, it is likely to have MTC, but if basal CT level is below 10 pg/ml, the probability of developing thyroid disease is low. In cases with basal CT level between 10-100 pg/ml, pentagastrin-stimulated (PS) CT level is studied to evaluate MTC and C cell hyperplasia (CHH). This study aimed to determine cut-off value for basal and PS peak CT level for diagnosis of MTC. Patients-methods We retrospectively reviewed files of patients presented to endocrine outpatient clinic of Ege University, Medicine School, between 2010 and 2019, 176 patients with basal CT level of 10-100 pg/ml and patients with PS test were included to the study. Findings The ROC analysis was used to determine cut-off value for basal CT that can discriminate cases with MTC and those with nodular goiter. Cut-off value for basal CT was calculated as 46.5 pg/ml (specificity; 100 %, sensitivity; 74 %). In the ROC analysis for peak PS CT, cut-off value was calculated as 285 pg/ml (specificity:100 %; sensitivity:82 %). When peak CT level was > 290 pg/ml in PS test, both specificity and sensitivity for MTC were determined as 100 %. The PS peak CT level > 285 pg/ml was significant for MTC diagnosis while level of 117-274 pg/ml was significant for CHH. Conclusion In this study, cut-off value was calculated as 46.5 pg/ml for basal CT whereas 285 pg/ml for PS peak CT in the diagnosis of preoperative MTC. Key words: Medullary thyroid cancer, C cell hyperplasia, Calcitonin, Pentagastrin, Cut-off.

Clinicians may be hesitant to prescribe biologics or immunomodulators to individuals with familial adenomatous polyposis (FAP) and comorbid inflammatory disease (CID) because of increased cancer risk. Our aim was to compare the risk of malignancy in FAP individuals with inflammatory bowel (IBD) and/or rheumatic disease that received biologics/immunomodulators to those who did not. Individuals with FAP and CID were included in the study. We compared the incidence of cancer between individuals exposed to biologics/immunomodulators compared to unexposed from the date of diagnosis of comorbid disease till last follow up or death. Hazard ratio (HR) for cancer was computed using Cox regression model and compared by exposure status to biologic/immunomodulators. 25 individuals with FAP and a comorbid inflammatory disease were identified including 9 (36%) with IBD and 16 (64%) with rheumatic disease. 14 (56%) were exposed to a biologic and or immunomodulator. Median duration of biologic/immunomodulator exposure was 48 (2-180) months. 3 (21.4%) in the exposed group compared to 1 (9.1%) in the unexposed group developed cancer with a HR for exposure of 1.92 (CI 0.2-18.5, p = 0.57). Median duration of follow up after the diagnosis of inflammatory disease was 10 (5.5-17.0) years in the exposed and 6 (3.0-15.0) years in the unexposed group. In the exposed group, 1 patient developed gastric and 2 developed colon cancer. One unexposed patient developed medullary thyroid cancer. There is a possible trend of more cancers in the group that received biologics/immunomodulators-but given the small number of patients and p-value, there may be no difference at all. This preliminary finding warrants study in a larger cohort.

Background: Medullary thyroid cancer (MTC) can be associated with significant morbidity and mortality in advanced cases. Hence, we aimed to identify factors at the time of MTC surgery that predict ...

Summary Background The incidence of thyroid cancer has increased in different populations worldwide in the past 30 years. We present here an overview of international trends of thyroid cancer incidence by major histological subtypes. Methods We did a population-based study with data for thyroid cancer incidence collected by the International Agency for Research on Cancer (IARC) for the period 1998–2012. Data were extracted from the Cancer Incidence in Five Continents plus compendium. We selected data for 25 countries that had a population of more than 2 million individuals covered by cancer registration (87 registries in total). Further criteria were that the selected registration areas had to have a proportion of unspecified thyroid cancer of less than 10% and analyses were restricted to individuals aged 20–84 years. We calculated age-specific incidence rates and age-standardised rates per 100 000 person-years for individuals aged 20 to 84 years, and assessed trends by country, sex, and major histological subtype (papillary, follicular, medullary, or anaplastic) based on absolute changes in age-standardised incidence rates between 1998–2002 and 2008–12. Findings Papillary thyroid cancer was the main contributor to overall thyroid cancer in all the studied countries, and was the only histological subtype that increased systematically in all countries, although with large variability between countries. In women, the age-standardised incidence rate of papillary thyroid cancer during 2008–12 ranged from 4·3–5·3 cases per 100 000 person-years in the Netherlands, the UK, and Denmark, to 143·3 cases per 100 000 women in South Korea. For men during the same period, the age-standardised incidence rates of papillary thyroid cancer per 100 000 person-years ranged from 1·2 cases per 100 000 in Thailand to 30·7 cases per 100 000 in South Korea. In many countries in Asia, the increase in papillary thyroid cancer rates in women was particularly pronounced after the year 2000; rates stabilised since around 2009 in the USA, Austria, Croatia, Germany, Slovenia, Spain, Lithuania, and Bulgaria. Temporal trends for follicular and medullary thyroid cancer did not show consistent patterns across countries, but slight decreases were seen for anaplastic thyroid cancer in 21 of 25 countries between 1998–2002, and 2008–12. In 2008–12, age-standardised rates for the follicular subtype ranged between 0·5 and 2·5 cases per 100 000 women (and between 0·3 and 1·5 per 100 000 men), while those for the medullary subtype were always less than 1 case per 100 000 women or men, and for anaplastic thyroid cancer less than 0·2 cases per 100 000 women or men. Interpretation In the period from 1998 to 2012, the rapid increases in thyroid cancer incidence were observed only for papillary thyroid cancer, the subtype more likely to be found in a subclinical form and therefore detected by intense scrutiny of the thyroid gland. Funding French Institut National du Cancer, Italian Association for Cancer Research, Italian Ministry of Health.

Medullary thyroid cancer (MTC) is an infrequent neuroendocrine tumor, which amounts to 3–5% of all thyroid malignancies. Approximately 75–80% of MTCs are sporadic neoplasms. The rest of 20–25% are familial cases that belong to multiple endocrine neoplasia (MEN) syndromes, specifically MEN2 and MEN3. These cases of familial MTC are attributed to an activating germline mutation of a tyrosine kinase receptor gene, the rearranged during transfection (RET) proto-oncogene, located on chromosome 10q11.21. These mutations are also found in some cases of sporadic MTC. This review sets forth in summary the accepted guidelines and approaches regarding diagnosis, management, and treatment of MTC. Surgical resection is the standard care, and an early, prophylactic intervention is performed in genetic cases. Further investigation and understanding of the molecular pathways involved in the growth and advancement of MTC is required in order to provide efficient therapy in cases of progressive disease.

There is no evidence-based guidance on the extent of prophylactic neck surgery for second-generation multiple endocrine neoplasia type 2B (MEN 2B), a newly emerging entity in the molecular era. In this investigation of MEN 2B children who inherited the M918T RET germline mutation from a phenotypically affected MEN 2B parent, 6 MEN 2B children (4 girls and 2 boys) from 5 MEN 2B parents (4 mothers and 1 father) were identified. None of the 6 second-generation MEN 2B children who had preoperative calcitonin serum levels between 2 and 105 pg/mL and underwent prophylactic total thyroidectomy before the age of 4 years after receiving a positive RET gene test harbored node metastases. There was no recurrent laryngeal nerve palsy or postoperative hypoparathyroidism. Within the limitations of this study, total thyroidectomy alone is adequate therapy for second-generation MEN 2B children aged 1–4 years old with preoperative calcitonin serum levels ≤100 pg/mL.

Introduction: Germline mutations in predisposing genes have been found in 30-40% of pheochromocytoma/paraganglioma patients. Screening for inherited genetic mutations provide clinicians with mutation-positive patient management strategies in addition to identifying family members at risk of disease. However, genetic testing for pheochromocytoma has not been performed widely in Vietnam. Methods: Seven patients diagnosed with pheochromocytoma in Vietnam underwent germline genetic testing in known pheochromocytoma-associated genes by direct sequencing. When a germline mutation was identified the first-degree relatives were counseled and offered genetic testing for the inherited mutation. Results: Mutations were found in five of seven cases and all mutations were in RET proto-oncogene codon 634 indicating a high risk of developing aggressive medullary thyroid cancer and in some cases leading to prophylactic thyroidectomy as recommended. Conclusions: Genetic testing plays an essential role in the clinical management of pheochromocytoma patients. Genetic results have significantly changed the clinical approach in these patients and identified ‘at risk’ family members.

Objectives: to study the long-term results of surgical treatment of patients with medullary thyroid carcinoma and evaluate the significance of prognostic factors. Materials and methods: the continuous retrospective study included 169 patients with histologically confirmed medullary cancer who were initially operated at the Northwestern Center for Endocrinology and Endocrine Surgery of the SPbSU University Clinic from 2010 to 2016. They were divided into prognostic groups according to the level and dynamics of postoperative calcitonin and clinical manifestations of the disease. Results: The study allowed to assess the effect of predictive factors on the risks of progression and recurrence in medullary thyroid cancer. Size of the primary tumor more than 2 cm significantly increases the risk of disease progression (OR=6,56 (0.52-17.96) p=0,00001495). Invasion of the thyroid capsule and metastases to regional lymph nodes are even more important prognostic value as OR=49,08 (10.72-224.89), p=0,00000011 и OR=30,63 (9,75-96,27), p600 pg/ml affects the prognosis (OR=6,65 (2,53-17,59) p=0.01055). Its prognostic value is comparable to the size of the primary tumor and significantly less than the presence of regional and distant metastases. Conclusions: Unfavorable prognosis in 21 (12.4%) observed patients is associated not only with the presence of distant metastases, but also and independently with regional ones.

The prevalence of non-medullary thyroid cancer (NMTC) is increasing worldwide. Although most NMTCs grow slowly, conventional therapies are less effective in advanced tumors. Approximately 5–15% of NMTCs have a significant germline genetic component. Awareness of the NMTC susceptibility genes may lead to earlier diagnosis and better cancer prevention. The aim of this study was to provide the current panorama of susceptibility genes associated with NMTC and the spectrum of diseases associated with these genes. Twenty-five candidate genes were identified by searching for relevant studies in PubMed. Each candidate gene was carefully checked using six authoritative genetic resources: ClinGen, National Comprehensive Cancer Network guidelines, Online Mendelian Inheritance in Man, Genetics Home Reference, GeneCards, and Gene-NCBI, and a validated natural language processing (NLP)-based literature review protocol was used to further assess gene–disease associations where there was ambiguity. Among 25 candidate genes, 10 (APC, DICER1, FOXE1, HABP2, NKX2-1, PRKAR1A, PTEN, SDHB, SDHD, and SRGAP1) were verified among the six genetic resources. Two additional genes, CHEK2 and SEC23B, were verified using the NLP protocol. Seventy-nine diseases were found to be associated with these 12 NMTC susceptibility genes. The following diseases were associated with more than one NMTC susceptibility gene: colorectal cancer, breast cancer, gastric cancer, kidney cancer, gastrointestinal stromal tumor, paraganglioma, pheochromocytoma, and benign skin conditions. Twelve genes predisposing to NMTC and their associated disease spectra were identified and verified. Clinicians should be aware that patients with certain pathogenic variants may require more aggressive surveillance beyond their thyroid cancer risk.

PurposeSevere acute respiratory syndrome coronavirus 2 (SARS-Cov-2) is challenging health systems all over the world. Cancer patients have a higher risk of being infected by SARS-Cov-2 and higher coronavirus disease 2019 (COVID-19) severity and mortality. Up to date, there were no data about COVID-19 in patients with thyroid cancer (TCs). The aim of the study was to describe the prevalence of COVID-19 in a well-characterized series of TC patients evaluated for the persistence of the neoplastic disease from March to September 2020; as secondary objective, we looked for the COVID-19 disease severity in a subgroup of multimetastatic TC patients.MethodsWe evaluated 1464 patients affected by persistent TC: 67 patients who were taking multikinase inhibitors (MKIs) and 1397 under active surveillance for a persistent but stable disease. During the clinical evaluation, all patients were specifically investigated about a positive history of Sars-Cov-2 infection.ResultsSARS-Cov-2 infection was identified in 4/1464 (0.3%) cases of patients affected by TC. We identified three cases among patients under active surveillance (0.2%), and one case among patients treated with MKI systemic therapy (1/67, 1.5%). This patient was taking vandetanib for metastatic medullary thyroid cancer (MTC), when he came to our attention referring severe fatigue, dyspnea for light physical activities. He presented a mild COVID-19 and he received exclusively supportive care. After a multidisciplinary consultation, we decided against the discontinuation of vandetanib. After 2 months from the infection, he did not present any signs of active infection, and the MTC metastatic disease was stable.ConclusionsWe showed that COVID-19 is not more frequent in TC patients than in general population, although a relatively higher prevalence in the group of TC patients treated with MKIs. A single patient with advanced TC and SARS-Cov-2 infection during MKIs treatment had a mild COVID-19 and did not require the discontinuation of MKI therapy. In cases of more severe COVID-19, an accurate evaluation from a multidisciplinary team would consider risks and benefits in taking the decision to continue or stop MKI treatment.

Adrenocortical carcinoma (ACC) is a rare aggressive malignancy that originates in the outer layer of the adrenal gland. Most ACCs are sporadic, but a small percentage of cases are due to hereditary cancer syndromes such as Li‐Fraumeni syndrome (LFS), Lynch syndrome (LS), and familial adenomatous polyposis (FAP). Multiple endocrine neoplasia type 2A (MEN2A) is an inherited disorder that predisposes to medullary thyroid cancer, pheochromocytoma, and parathyroid hyperplasia. We present here a case of ACC with both LS and MEN2A; the family and medical history were consistent with Lynch. This is, to our knowledge, the first report of a patient with ACC associated with germline mutations in RET and MSH2, and no phenotypical characteristics of MEN2A.

In the 9 years since the publication of our 2011 review of targeted treatment of thyroid cancer with multikinase inhibitors, much has changed in the landscape of this heterogeneous disease. New multikinase and selective inhibitor treatments for medullary thyroid cancer, radioiodine-refractory thyroid cancer and anaplastic thyroid cancer have completed trials and improved progression-free survival. Many physicians are concerned by dose-limiting adverse effects of these drugs and are wary to begin treatment in patients who are systemically well but have marked disease burden, which makes the timing of treatment initiation challenging. Published mechanistic data on tyrosine kinase inhibitors (TKIs) have helped guide our understanding of how to dose effectively with these drugs. A major goal in TKI therapy is to optimize inhibition of oncogenic kinase drivers while maintaining patient quality of life. Real-world data have now been published on how TKIs have fared outside the clinical trial environment. In this Review, we provide a summary of published data on the efficacy of TKIs in clinical practice, to provide clinicians with a more realistic view of how their patients will manage and respond to TKI therapy. Furthermore, we review the data on mechanisms of inhibition, outcomes and adverse effects of TKIs and provide an update on targeted treatment of thyroid cancer, focusing on optimizing the timing of treatment initiation.

Medullary thyroid cancer (MTC) is a challenging neuroendocrine malignancy where the role of nuclear medicine imaging is currently limited. This paper investigates the potential diagnostic value of [18F]Fluorocholine PET/CT in primary MTC. We prospectively enrolled 25 patients (10 male, 15 female) with suspicion for primary MTC based on fine-needle aspiration biopsy (FNAB). All patients had a baseline three phase [18F]Fluorocholine PET/CT (2.5 MBq/kg): two regional head and neck and upper mediastinum studies at 5 min (first phase) and 120 min (third phase) and a whole-body PET/CT (from the skull vertex to mid-thighs) at 60 min (second phase). Any non-physiological radiotracer uptake was regarded as MTC positive. All patients referred to surgery had a preoperative neck-US. True lesion status was assessed using either histopathology, FNAB results or follow-up imaging and laboratory (calcitonin, CEA) results. Results with p

BACKGROUND: The aim of this study was to evaluate the association between age and disease specific mortality (DSM) among adults diagnosed with medullary thyroid cancer (MTC). METHOD: Surveillance, Epidemiology, and End Results (SEER-18) was used to analyze adult MTC patients stratified by age (18–64, 65–79, ≥80 years). Associations between patient demographics, tumor size, nodal status, metastatic disease, and extent of surgery on DSM was assessed with multivariable Cox regression. RESULTS: Among 1457 patients with MTC, 1008 (69.2%) were younger adults, 371 (25.5%) older adults, and 78 (5.4%) were super-elderly. A significantly higher proportion of older adults and super-elderly had less than the recommended operation for MTC. On multivariable analysis, older adults and super-elderly were 2.9 and 6.7 times more likely to have an increased DSM (HR:2.91, 95% CI: 1.83–4.63; p < 0.001 and HR: 6.70, 95%CI: 3.69–12.20; p < 0.001). Extent of surgery or lymphadenectomy did not affect DSM. CONCLUSIONS: Increased age is an independent predictor of DSM in patients with MTC.

This study aimed to explore the prognostic impact that the log odds of positive lymph nodes (LODDS) has on medullary thyroid cancer (MTC) and to develop a nomogram incorporating LODDS to predict the cancer-specific survival (CSS) of MTC. Data from 1110 MTC patients after total thyroidectomy were collected from the Surveillance, Epidemiology, and End Results (SEER) database and divided into training and validation cohorts. The prognostic efficiency of N status from the American Joint Committee on Cancer (AJCC) staging system, the number of positive lymph nodes (PLNN), and LODDS were compared using the Harrell concordance index (C-index), the Akaike information criterion (AIC), and area under the receiver operating characteristic (ROC) curve (AUC). A multivariate Cox analysis was performed to determine the independent prognostic factors, and a nomogram based on LODDS was constructed. The nomogram's performance was assessed with the C-index, AUC, calibration curves, and decision curve analysis (DCA). Among the three lymph node (LN) staging systems, LODDS showed the highest accuracy in predicting CSS for MTC. In the training cohort, the C-index of the LODDS-based nomogram was 0.895. The AUCs were 0.949, 0.917, 0.925, and 0.901 for predicting 1-, 3-, 5- and 10-year CSS, respectively. The calibration plots and DCA showed the superior clinical applicability of the nomogram. These results were verified in the validation cohort. As an independent prognostic factor for MTC, LODDS demonstrated superior prognostic efficiency over N status and PLNN. This LODDS-based nomogram yielded better performance than the AJCC tumor-node-metastasis (TNM) staging system in predicting CSS after surgery for MTC.

Introduction.The main method of preoperative diagnosis of thyroid tumors and the identification of possible metastasis is a cytological examination of smears obtained by fine-needle aspiration biopsy. However, the cytological material of the lymph nodes may not be adequate, and the detection of metastases faces a number of difficulties. In our recent study, we described a variant of the molecular classifier that allows the detection and typing of malignant thyroid tumors by analyzing several molecular markers in cytological preparations.The study objectivewas to assess the applicability of the developed method for the preoperative detection of metastases of papillary and medullary thyroid cancer in the lymph nodes of the neck lateral cellular tissue.Materials and methods.A total of 86 cytological samples were used, obtained from individual lymph nodes of 62 patients who had a diagnosis – thyroid cancer. Samples were analyzed by real-time polymerase chain reaction regarding the preselected set of molecular markers: the BRAF V600E mutation, the normalized concentration of HMGA2, FN1 and SERPINA1 mRNA, 5 miRNAs and the mitochondrial/nuclear DNA ratio. The decision tree-based classifier was used to discriminate between benign and malignant samples.Results.The previously described classifier, based on the analysis of the BRAF V600E mutation, the content of HMGA2 mRNA, 3 miRNAs and the mitochondrial/nuclear DNA ratio, revealed metastases of thyroid cancer with good specificity (98 %) but less sensitivity (83 %). Therefore, a new classifier was built, including three markers – HMGA2 and FN1 mRNA, and miRNA-375, which, with regard to the detection of metastases, showed good sensitivity – 93 % with a slight decrease in specificity (up to 96 %).Conclusion.Thus, we demonstrated the possibility of preoperative detection of thyroid cancer metastases in the lymph nodes of the neck lateral cellular tissue by analyzing several molecular markers in cytological material.

Background: Medullary thyroid carcinoma (MTC) comprises 1–2% of all thyroid cancers, yet 15% of all thyroid cancer-related deaths. While up to 20% of cases may be predicted due to autosomal dominant germline mutations, 80% of cases are sporadic. However, due to non-specific presenting symptoms and diagnostic imaging, prompt diagnosis and treatment has remained elusive. This article will further investigate the limitations of MTC diagnosis and look into future areas for diagnostic improvement. Methods: Relevant articles were identified using a systematic PubMed and Google Scholar search. Results: Prophylactic total thyroidectomy for the 20% of MTC cases that are present in autosomal dominant disorder provides definitive treatment. Serum calcitonin (Ctn) screening has several technical limitations due to population variability and laboratory assay interference, but advances in laboratory technology and combined use with fine needle aspiration increase its sensitivity. Other serum assays such as carcinoembryonic antigen and procalcitonin have limited applicability. Thyroid ultrasound remains the gold standard for the initial diagnostic planning, with limited application for CT, MRI, and PET imaging. Conclusion: With complete surgical resection the only definitive treatment, early MTC diagnosis has presented an elusive challenge, mainly due to its relative rarity and difficulty in finding an economic screening strategy. Careful family history combined with fine needle aspiration with serum Ctn analysis can improve diagnostic sensitivity and specificity to greater than 95%.