MARCOS ROBERTO TAVARES

(Fonte: Lattes)
Índice h a partir de 2011
9
Projetos de Pesquisa
Unidades Organizacionais
Instituto Central, Hospital das Clínicas, Faculdade de Medicina
LIM/28 - Laboratório de Cirurgia Vascular e da Cabeça e Pescoço, Hospital das Clínicas, Faculdade de Medicina

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Agora exibindo 1 - 10 de 26
  • article 10 Citação(ões) na Scopus
    Tratamento cirúrgico do hiperparatireoidismo secundário: revisão sistematizada da literatura
    (2014) MAGNABOSCO, Felipe Ferraz; TAVARES, Marcos Roberto; MONTENEGRO, Fabio Luiz de Menezes
    Secondary hyperparathyroidism (HPT) has a high prevalence in renal patients. Secondary HPT results from disturbances in mineral homeostasis, particularly calcium, which stimulates the parathyroid glands, increasing the secretion of parathyroid hormone (PTH). Prolonged stimulation can lead to autonomy in parathyroid function. Initial treatment is clinical, but parathyroidectomy (PTx) may be required. PTx can be subtotal or total followed or not followed by parathyroid tissue autograft. We compared the indications and results of these strategies as shown in the literature through a systematic literature review on surgical treatment of secondary HPT presented in MedLine and LILACS from January 2008 to March 2014. The search terms were: hyperparathyroidism; secondary hyperparathyroidism; parathyroidectomy and parathyroid glands, restricted to research only in humans, articles available in electronic media, published in Portuguese, Spanish, English or French. We selected 49 articles. Subtotal and total PTx followed by parathyroid tissue autograft were the most used techniques, without consensus on the most effective surgical procedure, although there was a preference for the latter. The choice depends on surgeon's experience. There was consensus on the need to identify all parathyroid glands and cryopreservation of parathyroid tissue whenever possible to graft if hypoparathyroidism arise. Imaging studies may be useful, especially in recurrences. Alternative treatments of secondary HPT, both interventional and conservative, require further study.
  • article 35 Citação(ões) na Scopus
    Comparison of Ga-68 PET/CT to Other Imaging Studies in Medullary Thyroid Cancer: Superiority in Detecting Bone Metastases
    (2018) CASTRONEVES, Luciana Audi; COURA FILHO, George; FREITAS, Ricardo Miguel Costa de; SALLES, Raphael; MOYSES, Raquel Ajub; LOPEZ, Rossana Veronica Mendoza; PEREIRA, Maria Adelaide Albergaria; TAVARES, Marcos Roberto; JORGE, Alexander Augusto de Lima; BUCHPIGUEL, Carlos Alberto; HOFF, Ana Oliveira
    Context: Persistent disease after surgery is common in medullary thyroid cancer (MTC), requiring lifelong radiological surveillance. Staging workup includes imaging of neck, chest, abdomen, and bones. A study integrating all sites would be ideal. Despite the established use of gallium-68 (Ga-68) positron emission tomography (PET)/CT with somatostatin analogues in most neuroendocrine tumors, its efficacy is controversial in MTC. Objective: Evaluate the efficacy of Ga-68 PET/CT in detecting MTC lesions and evaluate tumor expression of somatostatin receptors (SSTRs) associated with Ga-68 PET/CT findings. Methods: Prospective study evaluating 30 patients with MTC [group 1 (n = 16), biochemical disease; group 2 (n = 14), metastatic disease]. Patients underwent Ga-68 PET/CT, bone scan, CT and ultrasound of the neck, CT of the chest, CT/MRI of the abdomen, and MRI of the spine. Ga-68 PET/CT findings were analyzed by disease site as positive or negative and as concordant or discordant with conventional studies. Sensitivity and specificity were calculated using pathological or cytological analysis or unequivocal identification by standard imaging studies. Immunohistochemical analysis of SSTRs was compared with Ga-68 PET/CT findings. Results: In both groups, Ga-68 PET/CT was inferior to currently used imaging studies except for bone scan. In group 2, Ga-68 PET/CT sensitivities were 56%, 57%, and 9% for detecting neck lymph nodes, lung metastases, and liver metastases, respectively, and 100% for bone metastases, superior to the bone scan (44%). Expression of SSTRs, observed in 44% of tumors, was not associated with Ga-68-DOTATATE uptake. Conclusions: Ga-68 PET/CT does not provide optimal whole-body imaging as a single procedure in patients with MTC. However, it is highly sensitive in detecting bone lesions and could be a substitute for a bone scan and MRI.
  • article
    Does the Intensity of IGG4 Immunostaining Have a Correlation with the Clinical Presentation of Riedel's Thyroiditis?
    (2018) SIMOES, C. A.; TAVARES, M. R.; ANDRADE, N. M. M.; UEHARA, T. M.; DEDIVITIS, R. A.; CERNEA, C. R.
    Riedel's thyroiditis (RT) represents one type of IgG4-related thyroid disease (IgG4RTD) and the diagnosis involves quantitative immunohistochemistry showing dense lymphoplasmacellular inflammatory infiltrate consisting of IgG4- positive plasma cells with storiform fibrosis and obliterative phlebitis. We report a case of RT with progressive enlargement of the anterior neck, severe dysphagia, odynophagia, and dyspnea. The patient underwent surgical decompression of the airway, protection tracheotomy, and gastrostomy for nutritional intake 6 months after first symptoms. Complete resolution occurred after surgical treatment combined with prednisolone. Immunostaining revealed IgG4-positive plasma cells 12/HPF (high-power field) and the IgG4/IgG ratio 25%, values that were disproportionate to the intensity of the patient's symptoms. As to this case and the few cases described and analyzed in the literature, our impression is that there is no relation between the intensity of symptoms in RT with the total number of IgG4positive plasma cells and the IgG4/IgG ratio, but more studies are needed.
  • article 34 Citação(ões) na Scopus
    Sorafenib for the Treatment of Progressive Metastatic Medullary Thyroid Cancer: Efficacy and Safety Analysis
    (2016) CASTRONEVES, Luciana Audi de; NEGRAO, Marcelo Vailati; FREITAS, Ricardo Miguel Costa de; PAPADIA, Carla; LIMA JR., Jose Viana; FUKUSHIMA, Julia T.; SIMAO, Eduardo Furquim; KULCSAR, Marco Aurelio Vamondes; TAVARES, Marcos Roberto; JORGE, Alexander Augusto de Lima; CASTRO, Gilberto de; HOFF, Paulo Marcelo; HOFF, Ana Oliveira
    Background: Treatment of advanced medullary thyroid carcinoma (MTC) was recently improved with the approval of vandetanib and cabozantinib. However, there is still a need to explore sequential therapy with more than one tyrosine kinase inhibitor (TKI) and to explore alternative therapies when vandetanib and cabozantinib are not available. This study reports the authors' experience with sorafenib as a treatment for advanced MTC. Methods: This is a retrospective longitudinal study of 13 patients with progressive metastatic MTC treated with sorafenib 400mg twice daily between December 2011 and January 2015. The primary endpoints were to evaluate response and progression-free survival (PFS) in patients treated with sorafenib outside a clinical trial. The secondary endpoint was an assessment of the toxicity profile. One patient was excluded because of a serious allergic skin rash one week after starting sorafenib. Results: The analysis included 12 patients with metastatic MTC (median age 48 years), 10 with sporadic and 2 with hereditary disease. The median duration of treatment was 11 months, and the median follow-up was 15.5 months. At data cutoff, 2/12 (16%) patients were still on treatment for 16 and 34 months. According to Response Evaluation Criteria in Solid Tumors analysis, 10 (83.3%) patients showed stable disease, and two (16.6%) had progression of disease; no partial response was observed. The median PFS was nine months. However, three patients with extensive and rapidly progressive disease died within three months of sorafenib treatment. The median PFS excluding these three patients was 12 months. Adverse events (AE) occurred in nine (75%) patients. The main AEs were skin toxicity, weight loss, and fatigue. Five (41.6%) patients needed dose reduction, and one patient discontinued treatment because of toxicity. Conclusions: Treatment with sorafenib in progressive metastatic MTC is well tolerated and resulted in disease control and durable clinical benefit in 75% of patients. Sorafenib treatment could be considered when vandetanib and cabozantinib are not available or after failing these drugs.
  • article 9 Citação(ões) na Scopus
    MULTIPARAMETRIC ULTRASOUND EVALUATION OF THE THYROID: ELASTOGRAPHY AS A KEY TOOL IN THE RISK PREDICTION OF UNDETERMINED NODULES (BETHESDA III AND IV)-HISTOPATHOLOGICAL CORRELATION
    (2021) MORAES, Pedro H. M.; TAKAHASHI, Marcelo Straus; VANDERLEI, Felipe A. B.; V, Marcelo Schelini; CHACON, Danielle A.; TAVARES, Marcos Roberto; CHAMMAS, Maria Cristina
    The purpose of this study was to select thyroid nodules most at risk for malignancy among those cytologically undetermined by fine-needle aspiration biopsy (FNAB), using B-mode, color duplex Doppler and 2-D shear wave shear wave elastography (2-D-SWE). This was a prospective diagnostic accuracy study with 62 Bethesda III/IV nodules according to FNAB (atypia/follicular lesion of undetermined significance or follicular neoplasia/Hurthle cell neoplasm). Ultrasonography (US) data were compared with resection histologic results, revealing 35 of 62 benign nodules (56.4%) and 27 of 62 carcinomas (43.6%). Conventional US was uses to evaluate nodule echogenicity, dimensions, contours, presence of halo and microcalcifications. Doppler US was used to assess the vascularization (exclusively or predominantly peripheral or central) and mean resistance index of three nodule arteries. Elastography was used to evaluate the nodule elastographic pattern; mean nodule deformation index; deformation ratio between nodule and adjacent thyroid parenchyma; and mean deformation ratio between nodule and pre-thyroid musculature (MDR). Statistical analysis included chi(2), Fisher's exact, Student's t, Mann-Whitney tests and multivariable analysis by multiple logistic regression. Areas under the receiver operating characteristic curves (AUC-ROCs) were used for accuracy analysis. Fifty-eight participants (54.7 +/- 14.0 y, 51 women) were studied. The parameters that were statistically significant to the univariate analysis were hypoechogenicity, nodule diameter greater than width and all parameters analyzed from Doppler and elastography. Multivariate analysis revealed that the MDR (in kPa) was the best parameter for risk analysis of indeterminate nodules. Nodules with MDRs >1.53 exhibited a greater chance of malignancy (AUC-ROC = 0.98). We conclude that 2-D-SWE is able to select malignant nodules among those cytologically indeterminate, thus avoiding unnecessary surgery in these cytologic groups.
  • article 114 Citação(ões) na Scopus
    Risk Profiles and Penetrance Estimations in Multiple Endocrine Neoplasia Type 2A Caused by Germline RET Mutations Located in Exon 10
    (2011) FRANK-RAUE, Karin; RYBICKI, Lisa A.; ERLIC, Zoran; SCHWEIZER, Heiko; WINTER, Aurelia; MILOS, Ioana; TOLEDO, Sergio P. A.; TOLEDO, Rodrigo A.; TAVARES, Marcos R.; ALEVIZAKI, Maria; MIAN, Caterina; SIGGELKOW, Heide; HUEFNER, Michael; WOHLLK, Nelson; OPOCHER, Giuseppe; DVORAKOVA, Sarka; BENDLOVA, Bela; CZETWERTYNSKA, Malgorzata; SKASKO, Elzbieta; BARONTINI, Marta; SANSO, Gabriela; VORLAENDER, Christian; MAIA, Ana Luiza; PATOCS, Attila; LINKS, Thera P.; GROOT, Jan Willem de; KERSTENS, Michiel N.; VALK, Gerlof D.; MIEHLE, Konstanze; MUSHOLT, Thomas J.; BIARNES, Josefina; DAMJANOVIC, Svetozar; MURESAN, Mihaela; WUESTER, Christian; FASSNACHT, Martin; PECZKOWSKA, Mariola; FAUTH, Christine; GOLCHER, Henriette; WALTER, Martin A.; PICHL, Josef; RAUE, Friedhelm; ENG, Charis; NEUMANN, Hartmut P. H.
    Multiple endocrine neoplasia type 2 is characterized by germline mutations in RET. For exon 10, comprehensive molecular and corresponding phenotypic data are scarce. The International RET Exon 10 Consortium, comprising 27 centers from 15 countries, analyzed patients with RET exon 10 mutations for clinical-risk profiles. Presentation, age-dependent penetrance, and stage at presentation of medullary thyroid carcinoma (MTC), pheochromocytoma, and hyperparathyroidism were studied. A total of 340 subjects from 103 families, age 4-86, were registered. There were 21 distinct single nucleotide germline mutations located in codons 609 (45 subjects), 611 (50), 618 (94), and 620 (151). MTC was present in 263 registrants, pheochromocytoma in 54, and hyperparathyroidism in 8 subjects. Of the patients with MTC, 53% were detected when asymptomatic, and among those with pheochromocytoma, 54%. Penetrance for MTC was 4% by age 10, 25% by 25, and 80% by 50. Codon-associated penetrance by age 50 ranged from 60% (codon 611) to 86% (620). More advanced stage and increasing risk of metastases correlated with mutation in codon position (609-620) near the juxtamembrane domain. Our data provide rigorous bases for timing of premorbid diagnosis and personalized treatment/prophylactic procedure decisions depending on specific RET exon 10 codons affected. Hum Mutat 32:51-58, 2011. (C) 2010 Wiley-Liss, Inc.
  • article 17 Citação(ões) na Scopus
    Lymph node distribution in the central compartment of the neck: An anatomic study
    (2014) TAVARES, Marcos Roberto; CRUZ, Jose Arnaldo Shiomi da; WAISBERG, Daniel Reis; TOLEDO, Sergio Pereira de Almeida; TAKEDA, Flavio Roberto; CERNEA, Claudio Roberto; CAPELOZZI, Vera Luiza; BRANDAO, Lenine Garcia
    Background. Dissection of the central compartment of the neck (CCN) is performed for proven or suspected lymph node metastases of thyroid carcinoma. During this procedure, the recurrent laryngeal nerves and the parathyroid glands are at risk. The purpose of this study was to determine the anatomic distribution of the lymph nodes in the CCN. Methods. The anatomic distribution of the lymph nodes in the CCN was studied by dissection of 30 fresh cadavers. The soft tissue between the cricoid cartilage and the innominate vein, carotid arteries, and prevertebral fascia was removed and divided according to CCN sublevels. Nodules were identified by palpation in the specimen and sent for pathological examination. Results. Three to 44 (18.5 +/- 10.29) nodules were identified macroscopically. Two to 42 nodules were confirmed as lymph nodes after microscopic examination. The lymph node distribution was as follows: precricoid: 0 to 2 (0.9 +/- 0.72); pretracheal: 1 of 35 (12.4 +/- 8.19); lateral to the right recurrent laryngeal nerve (RLN): 0 to 11 (3.4 +/- 2.34); and lateral to the left: 0 to 4 (1.7 +/- 1.30). Twenty-six parathyroid glands were removed by 14 dissections. The innominate vein was found at 15 mm above the superior border of the clavicles to 35 mm below on the left side of the neck and 5 to 45 mm on the right side. Conclusion. The number of confirmed lymph nodes in the central neck varied from 2 to 42. Sixty-seven percent of the lymph nodes were in the pretracheal sublevel. There was no division between level VI and VII lymph nodes. Additionally, the innominate vein was found to be from 15 mm above the superior border of the clavicles to 35 mm below on the left side of the neck and 5 to 45 mm on the right side. Parathyroid glands were identified to be far away from the thyroid gland. (C) 2014 Wiley Periodicals, Inc.
  • article
    Practical tips to reduce complication rate in thyroidectomy
    (2017) CERNEA, Claudio; BRANDAO, Lenine G.; HOJAIJ, Flavio C.; CARLUCCI, Dorival De; VANDERLEI, Felipe; GOTODA, Renato; LEITE, Ana K.; KULCSAR, Marco A. V.; MATOS, Leandro L.; DEDIVITIS, Rogerio A.; ARAUJO-FILHO, Vergilius J. F.; TAVARES, Marcos R.
    Introduction: Thyroid cancer is the most frequent endocrine neoplasm, and its incidence has been consistently rising during the last decades. Surgical treatment is the choice, but the complications can be truly devastating. Methods: The objective of this article is to present some practical tips to reduce the complication rate in thyroid surgery. Results: The more frequent complications during a thyroidectomy are mentioned, as well as practical tips to try to prevent them: acute airway compression, nerve injuries (both inferior laryngeal and external branch of the superior laryngeal nerves), and hypoparathyroidism. Conclusion: The prevention of complications during a thyroidectomy is imperative. The only way that the surgeon can assure the safety is to strictly adhere to technical principles, with diligent hemostasis, thorough anatomical knowledge, and gentle handling of the anatomic structures adjacent to the thyroid gland.
  • article 3 Citação(ões) na Scopus
    Transoral thyroidectomy: A reflexive opinion on the technique
    (2021) TINCANI, Alfio; LEHN, Carlos; CERNEA, Claudio; QUEIROZ, Emilson; DIAS, Fernando; WALDER, Fernando; HOJAIJ, Flavio; MONTEIRO, Francisco; KLIGERMAN, Jacob; PODESTA, Jose; BRANDAO, Lenine; MELLO, Luiz Eduardo Barbalho de; MEDINA, Luiz; ABRAHAO, Marcio; TAVARES, Marcos; BARBOSA, Mauro; CERVANTES, Onivaldo; DEMETRIO, Paula; CURIOSO, Ricardo; LIMA, Roberto; ARAP, Sergio; VASCONCELLOS, Sylvio
  • bookPart
    Doenças malignas da tireoide
    (2021) VANDERLEI, Felipe Augusto Brasileiro; TAVARES, Marcos Roberto