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【Objective】 To investigate the clinical features and gene analysis of one pedigree with multiple endocrine neoplasia type 2A （MEN2A） so as to clarify the diagnosis and classification of the disease， guide treatment and prevention， and improve prognosis. 【Methods】 The clinical data of a 36-member MEN2A family， including 6 probands， with medullary thyroid carcinoma， were investigated， and the peripheral blood genomic DNA of 28 family members （blood sample of one proband was not collected） was extracted. PCR amplification was performed on exons 8， 10， 11， 13， 14， 15 and 16 of the RET gene， and the products were directly sequenced. 【Results】 Review of the medical history showed that two probands with medullary thyroid carcinoma were accompanied with hyperparathyroidism， and one family member had pheochromocytoma. The RET gene mutation test confirmed that 13 family members， consisting of 5 probands and 8 family members， had the RET proto-oncogene exon 10 missense mutation. The heterozygous missense had mutation c.1852T>A， leading to the conversion of cysteine （TGC） at position 618 to serine （AGC） （Cys618Ser）. All subjects carrying RET gene Cys618Ser mutation had abnormal thyroid ultrasound change， accompanied with elevated calcitonin levels. Subjects carrying wild type of RET gene had normal calcitonin levels. The family was finally diagnosed with MEN2A by RET gene detection. 【Conclusion】 RET gene detection plays key role in the diagnosis and treatment of patients with MEN2A family and has guiding value in the follow-up and prognosis of asymptomatic carriers. There is a positive correlation between calcitonin level and the RET protooncogene mutation Cys618Ser. Patients suspected of MEN2A should be screened in time.
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ABSTRACT A 42-year-old male presented with a 4-week history of a mass in the right inferior palpebral conjunctiva close to the punctum. An excisional biopsy of the lesion and histopathological examination revealed that the mass was composed of Schwann cells with thin conical nuclei, fine chromatin, and unnoticeable nucleoli. Immunohistochemically, the spindle cells were diffusely and strongly positive for S100 protein. Neurofilament immunostaining was also positive, which highlighted axons. In light of these findings, the tumor was diagnosed as solitary circumscribed neuroma. A comprehensive evaluation for multiple endocrine neoplasia type 2b was performed. However, no multiple endocrine neoplasia type 2b stigmata and no family history were detected. The diagnosis was therefore finalized as solitary circumscribed neuroma, which is considered as a rare condition. The differential diagnosis is based on the histopathological examination and immunohistochemical evaluation. As the tumor can be related with multiple endocrine neoplasia type 2b, it is essential to systematically investigate for multiple endocrine neoplasia type 2b in such cases.
RESUMO Um homem de 42 anos apresentou uma massa na conjuntiva palpebral inferior direita, próxima ao punctum, com evolução de 4 semanas. Uma biópsia excisional da lesão e o subsequente exame anatomopatológico revelaram que a massa era composta de células de Schwann com núcleos cônicos, cromatina fina e nucléolos não visíveis. Ao exame imuno-histoquímico, as células fusiformes mostraram-se difusa e fortemente positivas para a proteína S100. A imunocoloração também foi positiva para neurofilamentos e evidenciou os axônios. Considerando esses achados, o tumor foi diagnosticado como um neuroma circunscrito solitário. Procedeu-se uma investigação completa para neoplasia endócrina múltipla tipo 2b, entretanto, estigmas característicos e história familiar não foram detectados. Assim, o diagnóstico foi firmado como neuroma circunscrito solitário, condição rara cujo diagnóstico diferencial baseia-se no exame anatomopatológico e na avaliação imuno-histoquímica. Já que esse tumor pode estar relacionado à neoplasia endócrina múltipla tipo 2b, torna-se essencial, nesses casos, a investigação da neoplasia de forma sistemática.
Subject(s)
Humans , Male , Adult , Conjunctiva , Neurofibroma , Neuroma , Diagnosis, Differential , Neurofibroma/diagnosis , Neuroma/diagnosisABSTRACT
ABSTRACT As biotechnology innovations move from the bench to the bedside and, recently, also to the Internet, a myriad of emanating challenges and potentials may rise under distinct sociocultural and political economic contexts. Using a grounded-theory-inspired case study focused on the Brazilian research consortium for Medullary Endocrine Neoplasia type 2 (BrasMEN) - an inherited syndrome where genetic tests define cost-effective interventions - we outline facilitators and barriers to both development and implementation of a 'public health genomics' strategy under a developing country scenario. The study is based on participant observation at three centres and interviews with all who might hold an interest in MEN2 around Brazil. We discuss how a 'solidarity'-based motivation for individual and collective 'biocitizenship' is driving people's pre-emptive actions for accessing and making personalised healthcare available at Brazil's Unified Health System (SUS) via the 'co-production' of science, technology and the culture for precision medicine - termed Brazil's 'hidden' biomedical innovation system. Given the establishment of BrasMEN as 'solidarity networks' - promoting and supporting the cancer precision medicine's rationale - our data illustrates how a series of new bioethical challenges raise from such engagement with familial cancer genomics under Brazil's developing country scenario and how this social/soft technology constitute a solution for Euro/North American societies.
RESUMO Ao passo em que as inovações biotecnológicas migram da bancada para o leito e, mais recentemente, também para a Internet, uma miríade de desafios e potenciais pode surgir em contextos socioculturais e político-econômicos distintos. Usando um estudo de caso inspirado na teoria embasada em dados focado no consórcio de pesquisa brasileiro sobre a Neoplasia Endócrina Múltipla do Tipo 2 (BrasMEN) - uma síndrome rara em que testes genéticos definem intervenções custo-efetivas - ressaltamos facilitadores e barreiras para ambos desenvolvimento e implementação de uma estratégia de genômica em saúde pública no cenário de um país em desenvolvimento. O estudo foi baseado em observação participante em três centros e entrevistas com todos que podem ter um interesse sobre a MEN2 no Brasil. Discutimos como uma motivação baseada em 'solidariedade' para uma 'biocidadania' individual e coletiva está impulsionando ações preventivas nas pessoas para acessar e fazer com que cuidados em saúde personalizados sejam disponibilizados no Sistema Único de Saúde (SUS) do Brasil via a 'coprodução' de ciência, tecnologia e a cultura para medicina de precisão - denominado sistema de inovação biomédico brasileiro 'escondido'. Dado o estabelecimento do BrasMEN como 'redes de solidariedade' - promovendo e apoiando a abordagem da medicina de precisão em câncer - nossos dados ilustram como uma série de novos desafios bioéticos surgem desse engajamento com a genômica do câncer familiar no cenário de país em desenvolvimento brasileiro e como esta tecnologia social/leve constitui uma solução para sociedades europeias e norte-americanas.
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ABSTRACT Background: RET proto-oncogene mutations are responsible for familial thyroid medullary carcinoma and multiple endocrine neoplasia (MEN) type 2A and 2B. These syndromes develop specific biomarkers and, in the case of MEN2B, clinically observable stigmas. However, the diagnosis of patients with MEN2B is usually delayed. Because of the close genotype-phenotype correlation, molecular testing is the final approach for the diagnosis to establish preventive care and therapeutic behaviors. Discussion: pM918T is classified as ''highest risk'' for medullary carcinoma with a 50% of lifetime risk for developing pheochromocytoma. Most cases of MEN2B are due to a de novo mutation. Even with the increased risk of developing pheochromocytoma, our 24-year-old patient does not yet present one. Other factors may be involved in the modulation of the phenotype in different populations. Case report: We present the case of a woman diagnosed with a thyroid nodule at the age of nine. She underwent a total thyroidectomy plus radical cervical lymph node dissection, with a diagnosis and initial management of papillary thyroid carcinoma. During the evolution of the disease, she developed pulmonary metastases. At the age of 24, after her first endocrinological evaluation, typical physical manifestations of MEN2B were observed. A re-evaluation of the original thyroidectomy revealed a medullary carcinoma, with positive manifestation CEA and calcitonin. The analysis of RET proto-oncogene identified a de novo mutation in exon 16 (pM918T). Conclusion: The timely diagnosis of MEN2B offers opportunities to make appropriate preventive and therapeutic decisions that may change the natural evolution of the disease and its complications.
Subject(s)
Humans , Female , Adult , Multiple Endocrine Neoplasia Type 2b/complications , Multiple Endocrine Neoplasia Type 2b/diagnosis , Multiple Endocrine Neoplasia Type 2b/prevention & control , Diagnosis, Differential , Proto-Oncogene Proteins c-ret/analysisABSTRACT
Multiple endocrine neoplasia type 2A (MEN2A) is a hereditary syndrome. Here, two different RET proto-oncogen mutation were identified from family members of two MEN2A pedigrees by genetic screening. One RET mutations were found at codons 1893 and 1895 in exon 11 (1893-1895delCGA) from pedigree 1, which is a novel mutation, the other occurs at codon 634 (Cys634Arg) in exon 11 from pedigree 2. However, the clinical characteristics were similar in the patients of the two pedigrees. All the patients were in middle-age at onset. Most of them were firstly diagnosed with bilateral adrenal pheochromocytoma with different degrees of thyroid abnormalities (elevated serum calcitonin with or without thyroid mass, or had been diagnosed with medullary thyroid carcinoma). Some family members were with elevated serum parathyroid hormone but with no other evidences for hyperparathyroidism.
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El feocromocitoma constituye una neoplasia productora de catecolaminas que se presenta de forma esporádica o asociada a enfermedades de transmisión hereditaria, como la neoplasia endocrina múltiple. Los síntomas clásicos como la cefalea, sudoración y palpitaciones son atribuidos a la actividad del sistema nervioso simpático y suelen presentarse en forma de paroxismos. La tuberculosis pulmonar es una enfermedad infecciosa que constituye un problema de salud pública en muchos países, cuya incidencia depende de algunos factores incluyendo la inmunosupresión que generan las enfermedades endocrino-tumorales como la antes descrita. Presentamos el caso de un paciente masculino de 38 años que acude a emergencia por presentar un paroxismo de hipertensión arterial y dolor abdominal, como manifestaciones iniciales de un feocromocitoma en el contexto de una neoplasia endocrina múltiple de tipo IIA. El paciente desarrolló de forma concomitante tuberculosis pulmonar; no obstante, se logró tratar ambas entidades consiguiendo una evolución clínica favorable.
Pheochromocytoma is a catecholamine-producing neoplasm that may occur sporadically or associated with hereditary diseases, such as multiple endocrine neoplasia. The classic symptoms are headache, sweating, and palpitations and are attributed to the sympathetic nervous system activity, usually presenting as paroxysms. On the other hand, pulmonary tuberculosis is an infectious disease considered a public health problem in many countries, whose incidence depends on risk factors such as immunosuppression. It is well known that endocrine-tumor diseases such as multiple endocrine neoplasia can predispose to chronic inflammation and immunosuppression. We report the case of a 38-year-old male patient who had an episode of arterial hypertension and abdominal pain as the first symptoms of a pheochromocytoma associated with multiple endocrine neoplasia type 2A. The patient developed pulmonary tuberculosis simultaneously, but we managed to treat both entities and achieve a favorable clinical course.
Subject(s)
Humans , Male , Adult , Pheochromocytoma/diagnosis , Tuberculosis, Pulmonary/diagnosis , Adrenal Gland Neoplasms/diagnosis , Multiple Endocrine Neoplasia Type 2a/complications , Pheochromocytoma/etiology , Abdominal Pain/etiology , Risk Factors , Adrenal Gland Neoplasms/etiology , Hypertension/etiologyABSTRACT
About 20%–30% of all cases of multiple endocrine neoplasia type 2A (MEN 2A) is accompanied by primary hyperparathyroidism. These patients undergo parathyroidectomy and, if needed, autotransplantation. In rare cases, autotransplanted parathyroid tissues can cause hypoparathyroidism due to failure of transplantation or hyperparathyroidism due to proliferation of the transplanted tissue. A 68-year-old female with MEN 2A underwent left adrenalectomy for pheochromocytoma 15 years prior to presentation and total thyroidectomy, central and right lateral neck lymph node dissection, and subtotal parathyroidectomy with autotransplantation for medullary thyroid cancer and primary hyperparathyroidism 6 years previous. Recently, a doubtful parathyroid adenoma was detected in the left sternocleidomastoid muscle on ultrasonography and on an additional sestamibi scan. The mass was excised and histologically confirmed as parathyroid adenoma. This is a very rare case, and it suggests that long-term regular monitoring of serum calcium and intact parathyroid hormone levels is necessary after parathyroid autotransplantation.
Subject(s)
Aged , Female , Humans , Adrenalectomy , Autografts , Calcium , Hyperparathyroidism , Hyperparathyroidism, Primary , Hypoparathyroidism , Lymph Node Excision , Multiple Endocrine Neoplasia Type 2a , Multiple Endocrine Neoplasia , Neck , Parathyroid Glands , Parathyroid Hormone , Parathyroid Neoplasms , Parathyroidectomy , Pheochromocytoma , Recurrence , Thyroid Neoplasms , Thyroidectomy , Transplantation, Autologous , UltrasonographyABSTRACT
About 20%–30% of all cases of multiple endocrine neoplasia type 2A (MEN 2A) is accompanied by primary hyperparathyroidism. These patients undergo parathyroidectomy and, if needed, autotransplantation. In rare cases, autotransplanted parathyroid tissues can cause hypoparathyroidism due to failure of transplantation or hyperparathyroidism due to proliferation of the transplanted tissue. A 68-year-old female with MEN 2A underwent left adrenalectomy for pheochromocytoma 15 years prior to presentation and total thyroidectomy, central and right lateral neck lymph node dissection, and subtotal parathyroidectomy with autotransplantation for medullary thyroid cancer and primary hyperparathyroidism 6 years previous. Recently, a doubtful parathyroid adenoma was detected in the left sternocleidomastoid muscle on ultrasonography and on an additional sestamibi scan. The mass was excised and histologically confirmed as parathyroid adenoma. This is a very rare case, and it suggests that long-term regular monitoring of serum calcium and intact parathyroid hormone levels is necessary after parathyroid autotransplantation.
Subject(s)
Aged , Female , Humans , Adrenalectomy , Autografts , Calcium , Hyperparathyroidism , Hyperparathyroidism, Primary , Hypoparathyroidism , Lymph Node Excision , Multiple Endocrine Neoplasia Type 2a , Multiple Endocrine Neoplasia , Neck , Parathyroid Glands , Parathyroid Hormone , Parathyroid Neoplasms , Parathyroidectomy , Pheochromocytoma , Recurrence , Thyroid Neoplasms , Thyroidectomy , Transplantation, Autologous , UltrasonographyABSTRACT
Multiple endocrine neoplasia type 2B (MEN 2B) is an autosomal dominant disorder characterized by medullary thyroid cancer, pheochromocytoma, neuroma and Marfanoid feature. Medullary thyroid cancer occurs in more than 95% patients of MEN 2B and increases mortality. So, the early diagnosis of multiple endocrine neoplasia is very important, because in the early diagnosed and treated medullary thyroid cancer, the prognosis is excellent. This is a case of multiple endocrine neoplasia type 2B that diagnosed early by conjunctival neuroma. A 15-year-old female patient was presented with both conjunctival masses that occurred 6 months ago. The excisional biopsy revealed conjunctival neuroma. The multiple endocrine tumor was suspected, further evaluation was performed. Medullary thyroid cancer was confirmed by thyroid ultrasound and fine needle aspiration. Finally, MEN type 2B was confirmed by a RET mutation genetic testing.
Subject(s)
Adolescent , Female , Humans , Male , Biopsy , Biopsy, Fine-Needle , Early Diagnosis , Genetic Testing , Mortality , Multiple Endocrine Neoplasia Type 2b , Multiple Endocrine Neoplasia , Neuroma , Pheochromocytoma , Prognosis , Thyroid Gland , Thyroid Neoplasms , UltrasonographyABSTRACT
Multiple endocrine neoplasia type 2(MEN2) is a rare autosomal dominant inherited disorder characterized by the presence of medullary thyroid carcinoma, pheochromocytoma and other hyperplasia and/or neoplasia of different endocrine tissues in a single patient. MEN 2 is caused by germline mutations in the RET proto-oncogene is located on the pericentromeric region of chromosome 10 (10q11.2). We present our experience with two rare cases of MEN 2, an 11-years-old girl and a 10-years-old boy. Their parents had medullary thyroid carcinoma and genetic analysis showed the missense mutation of RET. They were screened for mutations in the RET proto-oncogene and RET mutations were found at codons 634 and 641. They were asymptomatic state but the girl had prophylactic total thyroidectomy. Children of families with RET mutations may develop early cancers and require prophylactic thyroidectomy before eight years.
Subject(s)
Child , Female , Humans , Male , Asymptomatic Diseases , Chromosomes, Human, Pair 10 , Codon , Germ-Line Mutation , Hyperplasia , Multiple Endocrine Neoplasia Type 2a , Multiple Endocrine Neoplasia , Mutation, Missense , Parents , Pheochromocytoma , Proto-Oncogenes , Thyroid Neoplasms , ThyroidectomyABSTRACT
Multiple endocrine neoplasia type 2(MEN2) is a rare autosomal dominant inherited disorder characterized by the presence of medullary thyroid carcinoma, pheochromocytoma and other hyperplasia and/or neoplasia of different endocrine tissues in a single patient. MEN 2 is caused by germline mutations in the RET proto-oncogene is located on the pericentromeric region of chromosome 10 (10q11.2). We present our experience with two rare cases of MEN 2, an 11-years-old girl and a 10-years-old boy. Their parents had medullary thyroid carcinoma and genetic analysis showed the missense mutation of RET. They were screened for mutations in the RET proto-oncogene and RET mutations were found at codons 634 and 641. They were asymptomatic state but the girl had prophylactic total thyroidectomy. Children of families with RET mutations may develop early cancers and require prophylactic thyroidectomy before eight years.
Subject(s)
Child , Female , Humans , Male , Asymptomatic Diseases , Chromosomes, Human, Pair 10 , Codon , Germ-Line Mutation , Hyperplasia , Multiple Endocrine Neoplasia Type 2a , Multiple Endocrine Neoplasia , Mutation, Missense , Parents , Pheochromocytoma , Proto-Oncogenes , Thyroid Neoplasms , ThyroidectomyABSTRACT
Objective To report a case of multiple endocrine neoplasia type 2B (MEN 2B) combined with analogous Marfan's syndrome with the related literature review,in order to improve the knowledge of this disease.Methods A case of MEN 2B combined with analogous Marfan's syndrome was admitted in Peking Union Medical College Hospital in Nov 2011.The patient was a 21-year-old male with the chief complaint of tongue thick for 13 years,found a tumor in right adrenal gland for 3 months.The patient underwent radical thyroidectomy and lymph node dissection in April 2011 because of thyroid tumor,and postoperative pathology confirmed the diagnosis of medullary thyroid carcinoma(T2N1bM0).The patient had normal blood pressure without fluctuation.Physical examination indicated that the patient had thin limbs,long fingers and long toes.Carpal syndrome and finger syndrome were positive.There were multiple tumor like nodules in the tip of the tongue,lips,inner canthus of eyelids,and laryngoscopy showed multiple nodulars in bilateral vocal cord and bilateral tip splitting.Enhanced CT showed a tumor of 2.9 cm×3.4 cm×3.8 cm in the right adrenal gland.Endocrine examination revealed high catecholamines:norepinephrine 159.3 nmol,epinephrine 13.3 nmol,and DA 918.2 nmol.131I-MIBG was positive for pheochromocytoma.The clinical manifestation was in stationary state.Preoperative diagnosis was MEN 2B,right adrenal pheochromocytoma,medullary thyroid carcinoma (T2N1bM0)after operation,multilple mucosa neurofibroma and analogous Marfan's syndrome.Results The pheochromocytoma in right adrenal gland was removed by laparoscopy under general anesthesia successfully on Dec 12,2011.The postoperative pathology confirmed the diagnosis of pheochromocytoma.And gene mutation was found in exon 16 of RET gene.MEN 2B with analogous Marfan's syndrome was diagnosed.During the follow-up period for 28 months,the patient had normal blood pressure and heart rate without tumor recurrence or metastasis.Conclusions MEN 2B combined with analogous Marfan's syndrome is extremely rare.For patients with medullary thyroid carcinoma,pheochromocytoma should be considered before operation.For patients with analogous Marfan's appearance,Marfan's syndrome should be differentially diagnosed.
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Objective To explore the clinical significance of integrated screening of RET in a Chinese multiple endocrine neoplasia type 2A(MEN 2A)family and to evaluate the feasibility and effectiveness of prophy-lactic total thyroidectomy to MEN 2A-related medullary thyroid carcinoma ( MTC).Methods Medical history was obtained from 10 family members in a 3-generation south China family .Systemic investigations including bio-chemical tests, imaging examinations and germline RET screening were performed .3 asymptomatic mutation car-riers underwent prophylactic total thyroidectomy .Results RET screening showed a heterozygous missense muta-tion of TGC to CGC at codon 634 on exon 11 in 6 members(p.C634R), which was completely consistent with the clinical manifestations.There were 4 males and 2 females.The initial mean diagnostic age of 33.5 years(ranging from 19 years to 65 years) and the mean maximum diameter of MTC was 2.3 cm(ranging from 0.7 cm to 5.2 cm). Among them 3 members had palpable neck masses (1 case with diarrhea).Right total thyroidectomy +right level Ⅵlymph-node dissection with modified right neck dissection in one case , and bilateral total thyroidectomy +bilat-eral level Ⅵlymph-node dissection in 2 were performed .In other 3 asymptomatic mutation carriers , prophylactic total thyroidectomy +bilateral level Ⅵ lymph-node dissection were also performed .Among them, 1 case of a-symptomatic pheochromocytom ( PHEO) underwent cortical-sparing adrenalectomy before MTC .After the first op-eration, 4 patients still presented a high value of calcitonin , among whom 1 patient( T3N 1bM 0-1) underwent re-operation for 3 times after the initial operation and presented metastasis to bone after 130 months, taking vandet-anib orally up to now;2 patients underwent reoperation at 6 and 7 months after initial operation respectively (T1N 1bM0 and T2N 1bM0), and the other one patient was closely monitored and followed up for 22 months(T2N 1b M0).Moreover, The calcitonin levels dropped to normal in the other 2 asymptomatic cases(T1N0M0) who were followed up for 20 months.Conclusions Pedigree screening can work up an early diagnosis and improve the prognosis of MEN 2A.Integrated screening of RET and pre-operative calcitonin level measurement and prophylac-tic thyroidectomy for asymptomatic RET mutation carriers are reasonable and effective .
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Introdução: A neoplasia endócrina múltipla tipo 2 (MEN2) é uma doença hereditária autossômica dominante causada por mutação germinativa RET, que cursa com carcinoma medular de tireóide (CMT), feocromocitoma (Feo) e hiperparatireoidismo. O CMT é uma neoplasia maligna, que se desenvolve já na 1ª década de vida, pouco responsiva a quimioterapia/radioterapia. Assim, tireoidectomia profilática é indicada antes dos 5 ou dos 10 anos, dependendo do códon mutado, para assegurar a cura. O CMT é um tumor de crescimento lento e os pacientes convivem com o diagnóstico de câncer por décadas. Além disto, podem desenvolver Feo, predispondo os ao risco de óbito por infarto agudo do miocárdio ou acidente vascular em idade jovem. Somam-se situações de stress como risco de transmissão aos descendentes, expectativa de resultados de exames periódicos e risco de múltiplas cirurgias. Há poucos trabalhos enfocando os aspectos psíquicos em MEN2. O doente oncológico pode desenvolver sintomas psicológicos de: ansiedade, depressão, angústia, medo de recorrência da doença, perturbações psicossomáticas, stress decorrente das cirurgias e auto-conceito negativo. Objetivos: avaliar a sintomatologia ansiosa e depressiva, a qualidade de vida, o ajustamento psicológico, a presença de culpa auto-referida pela transmissão da doença aos filhos, o conhecimento da doença e a adesão ao tratamento. Casuística: Avaliação de 43 pacientes pertencentes a 12 famílias com diagnóstico clínico e gênico de MEN2. Metodologia: Avaliação psicológica por Entrevista semidirigida, Escala Hospitalar de Ansiedade e Depressão (HAD), European Organization for Research and Treatment of Cancer Quality of Life, Escala de Ajustamento Mental para Câncer e Estrutura Fatorial. A análise dos dados foi realizada de modo quantitativo e qualitativo. Resultados: Todos os 43 pacientes com MEN2 apresentavam CMT (100%) e 19 deles tinham diagnóstico prévio ou atual de Feo (44%; 19/43). Dos 43 pacientes, 16 (37%) tratados por CMT...
Introduction: Multiple endocrine neoplasia type 2 (MEN2) is autosomal-dominant hereditary cancer syndrome caused by germline RET mutation with high susceptibility to develop tumors as medullary thyroid carcinoma (MTC), pheochromocytoma (Pheo), and hyperparathyroidism. The CMT is a malignancy that develops already in the 1st decade of life, poorly responsive to chemotherapy / radiotherapy. Thus, prophylactic thyroidectomy is indicated before 5 or 10 years, depending on the mutated codon to ensure healing. The CMT is a slow-growing tumor and the patients live with the diagnosis of cancer for decades. In addition, they can develop Pheo, predisposing them to risk of death from myocardial infarction or stroke at a young age. Add to stress conditions such as risk of transmission to offspring, expectative for results of periodic examinations and risk of multiple surgeries. It is known that cancer patients can develop psychological symptoms of anxiety, depression, distress, fear of recurrence, stress for surgery and negative self-concept. However, studies focusing on the psychological aspects in MEN2 are strict and mainly related with the time of RET genetic testing and genetic counselling. Objectives: To assess anxious and depressive symptoms, quality of life, psychological adjustment, presence of guilt by self-reported disease transmission to children, knowledge of disease and treatment adherence. Methods: Evaluation of 43 patients from 12 families with clinical and genetic diagnosis of MEN2. Methodology: Psychological assessment by semi-directed interview, Scale Hospital Anxiety and Depression (HAD), European Organization for Research and Treatment of Cancer Quality of Life Scale, Mental Adjustment to Cancer and Factor Structure. Data analysis was performed quantitatively and qualitatively. Results: All 43 patients had CMT MEN2 (100%) and 19 had previous or current diagnosis of pheochromocytoma (44%, 19/43). Of the 43 patients, 16 (37%) treated by...
Subject(s)
Humans , Male , Female , Adult , Anxiety/psychology , Symptom Assessment/psychology , Depression/psychology , /psychology , Quality of Life/psychology , Interview, Psychological , /diagnosis , Sickness Impact ProfileABSTRACT
Multiple endocrine neoplasia type 2 (MEN2) is an autosomal dominant disorder that can be distinguished as three different syndromes: multiple endocrine neoplasia type 2A (MEN2A), MEN2B and familial medullary thyroid carcinoma (FMTC). This disorder is usually caused by the mutations of the rearranged during transfection protooncogene gene (RET) or the neurotrophic tyrosine kinase receptor type 1 gene (NTRK1). To investigate the genetic cause in a Chinese Han family with MEN2A and the genotype-phenotype correlations, nine members belonging to 3 generations of MEN2A family with 5 affected subjects underwent genetic analysis. Standard GTG-banded karyotype analysis and sequencing of the RET and NTRK1 genes were performed to identify the genetic cause of this family. A heterozygous mutation p.Cys634Arg in the RET gene was identified in 5 patients with MEN2A and one asymptomatic family member. The phenotype of patients was that of classic MEN2A, characterized by medullary thyroid carcinoma and phaeochromocytoma. The clinical features of all cases with RET mutations varied greatly, including onset age of clinical manifestations, severity and comorbidities. Thus, this study not only identified the hereditary nature of the MEN2A in the cases, but also discovered a family member harboring the same p.Cys634Arg mutation, who was unaware of his condition. These finding may provide new insights into the cause and diagnosis of MEN2A and have implications for genetic counseling.
Subject(s)
Adolescent , Adult , Asian People , Female , Genetic Markers/genetics , Genetic Predisposition to Disease/ethnology , Genetic Predisposition to Disease/genetics , Genetic Testing , Humans , Male , Middle Aged , Multiple Endocrine Neoplasia Type 1/epidemiology , Multiple Endocrine Neoplasia Type 1/genetics , Pedigree , Polymorphism, Single Nucleotide/genetics , Proto-Oncogene Proteins c-ret/genetics , Young AdultABSTRACT
Objective To review clinical characteristics and treatment of multiple endocrine neoplasia type 2A (MEN-2A).Methods The clinical data of 13 patients with MEN-2A admitted to our hospital between 1988 and 2011 were retrospectively reviewed.All 13 cases were diagnosed as pheochromocytoma with medullary thyroid carcinoma,presenting no hyperparathyroidism,including 8 cases who had medullary thyroid carcinoma before pheochromocytoma and 5 cases who had medullary thyroid carcinoma and pheochromocytoma simultaneously.All 13 cases underwent resection for pheochromocytoma; 9 cases had bilateral adrenal resection,including 4 cases undergoing laparoscopic resection for pheochromocytoma.Thyroidectomy with bilateral dissection of regional lymph nodes was performed in 10 patients,and nodule enucleation was performed in 3 remaining patients.Results Adrenal pathology reported pheochromocytoma in all cases,including 3 malignant cases.Thyroid pathology reported medullary thyroid carcinoma in all cases.All 13 patients were followed-up visit,10 cases survived and 3 died from distant metastasis of medullary thyroid carcinoma.Conclusions MEN-2A is a rare disease.Surgery is the only treatment for this disease ; when patients have both pheochromocytoma and medullary thyroid carcinoma,to first remove the pheochromocytoma is preferable.
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Objective To observe the mode of RET proto-oncogene mutation in a pedigree with multiple endocrine neoplasia type 2A (MEN2A).Methods Six members from a MEN2A family,including the proband,were enrolled.Genomic DNAs of these members were extracted from peripheral blood lymphocytes for polymerase chain reaction(PCR),PCR products of 21 exons of the RET proto-oncogene were purified and a direct gene sequence analysis was performed.DNA sequencing was performed on the related exon of the other family members after verifying the mutation site.Results The female proband sufferd from pheochromocytoma and medullary thyroid carcinoma since the age of 45,two missense mutations of TGC(Cys) to TCC(Ser) at codon 634 and CTG(Leu) to TTT(Phe) at codon 633 in exon 11 of the RET proto-oncogene were detected in the proband,while the other members remain unchanged.Conclusions Analysis of the RET proto-oncogene identifies a united mutation of TGC (Cys) to TCC (Ser) at codon 634 and CTG(Leu) to TTT(Phe) at codon 633 in the proband.The former is a proven mutation related to MEN2A,while the latter has never been reported before.
ABSTRACT
INTRODUÇÃO: Na Neoplasia Endócrina Múltipla tipo 2 (NEM2), o desenvolvimento do Carcinoma Medular de Tireoide (CMT), Feocromocitoma (FEO) e Hiperparatireoidismo primário (HPT) está associado à mutações germinativas ativadoras no proto-oncogene RET. Casos de CMT esporádico podem apresentar mutações somáticas no RET (~40%). A variabilidade fenotípica observada em casos de CMT e FEO familiais associados à NEM2 indica o envolvimento de eventos genéticos adicionais que seriam responsáveis pelas diferenças clínicas observadas nos indivíduos afetados (idade de desenvolvimento, progressão e agressividade do tumor). Outras alterações genéticas no RET como duplas mutações, SNPs e haplótipos específicos podem influenciar na susceptibilidade, agressividade e modulação do fenótipo NEM2. Entretanto, os estudos de outros genes envolvidos no processo da tumorigênese NEM2 ainda estão em andamento. Recentemente foi mostrado que RET ativado controla a expressão de proteínas inibidoras do ciclo celular (p18 e p27). Mutações germinativas no gene p27 foram recentemente associadas à susceptibilidade de tumores neuroendócrinos e estão associadas à síndrome NEM4 (Neoplasia endócrina múltipla tipo 4). Mutações somáticas, inativadoras de p27, são raramente encontradas em vários tipos de tumores. Entretanto, diversos estudos documentaram que a redução na expressão e a sublocalização citoplamática de p27 são controladas por alterações pós-transducionais e/ou epigenéticas. OBJETIVOS: o estudo teve como objetivos avaliar a participação de genes, recentemente associados ao RET ativado, em tumores de pacientes com NEM2 e também verificar se polimorfismos no gene p27 estariam atuando como moduladores de fenótipo em uma grande família com NEM2. CASUÍTICA: foram analisadas 66 amostras tumorais advindas de 36 pacientes com diagnóstico clínico e genético de NEM2 e 28 indivíduos pertencentes a uma grande família com NEM2A-CMTF e mutação C620R no gene RET. MÉTODOS:...
INTRODUCTION: In Multiple Endocrine Neoplasia type 2 (MEN2) the development of medullary thyroid carcinoma (MTC), pheochromocytoma (PHEO) and primary hyperparathyroidism (HPT) are associated with activating germline mutations in RET proto-oncogene. Cases of sporadic MTC may have somatic RET mutations (~ 40%). The phenotypic variability observed in cases with familial MTC/MEN2 and PHEO/MEN2 indicates the probable involvement of additional genetic events that could be responsible for the clinical differences observed in the affected individuals (age development, progression and aggressiveness of the tumor). Other genetic alterations such as RET double mutations, SNPs and specific haplotypes may influence susceptibility, aggressiveness and MEN2 phenotype modulation. However, studies of other genes involved in the tumorigenesis of MEN2 are still in progress. Recently, it was shown that the activated RET controls the expression of cell cycle inhibitory proteins (p18 and p27). Germline mutations in the p27 gene have recently been associated with the susceptibility to neuroendocrine tumors and are associated with the MEN4 syndrome (Multiple endocrine neoplasia type 4). Somatic inactivating mutations p27 are rarely found in many types of tumors. However, several studies have documented that reduced expression and subcellular location of p27 is controlled by post-transductional changes and/or epigenetic factors. OBJECTIVES: This study aimed to evaluate the role of genes recently associated with RET activated in tumors from MEN2 patients and also check whether polymorphisms in the p27 gene would be acting as modulators of phenotype in a large MEN2 family. PATIENTS: We analyzed 66 tumor samples from 36 patients with clinical and genetic diagnosis of MEN2 and from 28 individuals belonging to a large family with FMTC/MEN2A and RET C620R mutation. METHODS: The analyses of somatic p27, p15, p18 and RET...
Subject(s)
Humans , Male , Female , Carcinoma, Medullary , Cell Transformation, Neoplastic , Pheochromocytoma/genetics , Hyperparathyroidism, Primary/genetics , /genetics , /genetics , Thyroid Neoplasms/genetics , Polymorphism, Single Nucleotide , Immunohistochemistry , Phosphorylation , Signal TransductionABSTRACT
Multiple endocrine neoplasia type 2 is an inherited cancer syndrome characterized by tumors of thyroid and adrenal tissues. Germline mutations of the REarranged during Transfection (RET) proto-oncogene, leading to its unregulated activation, are the underlying cause of this disease. Multiple endocrine neoplasia type 2 has been a model in clinical cancer genetics, demonstrating how knowledge of the genetic basis can shape the diagnosis and treatment of the disease. Here, we discuss the nature and effects of the most common recurrent mutations of RET found in multiple endocrine neoplasia type 2. Current understanding of the molecular mechanisms of RET mutations and how they alter the structure and function of the RET protein leading to its aberrant activation, and the effects on RET localization and signaling are described.
Subject(s)
Humans , Carcinoma, Medullary/genetics , /genetics , Mutation/genetics , Proto-Oncogene Proteins c-ret/genetics , Thyroid Neoplasms/genetics , Carcinoma, Medullary/physiopathology , Germ-Line Mutation , /physiopathology , Protein Conformation , Proto-Oncogene Proteins c-ret/physiology , Thyroid Neoplasms/physiopathologyABSTRACT
Multiple endocrine neoplasia 2A (MEN 2A) is an autosomal dominant disease that consists of medullary thyroid carcinoma (MTC), pheochromocytoma and parathyroid hyperplasia. The activation of germ-line mutations in the RET proto-oncogene are responsible for MEN 2A. We describe here a rare case of MEN 2A in a patient who presented with an acute catecholamine-induced cardiomyopathy with cardiogenic shock and acute renal failure. The patient was diagnosed with pheochromocytoma and MTC associated with MEN 2A, which was confirmed by the detection of a RET proto-oncogene mutation at exon 11 on codon 634 (Cys634Arg). During familial screening, the patient's younger sister was found to have a benign thyroid nodule. Re-evaluation of this thyroid nodule revealed MTC with the same gene mutation. We also provide a review of the relevant literature.