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1.
Teach Learn Med ; 34(5): 530-540, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-34279167

RESUMO

Issue: Life-long learning is a skill that is central to competent health professionals, and medical educators have sought to understand how adult professionals learn, adapt to new information, and independently seek to learn more. Accrediting bodies now mandate that training programs teach in ways that promote self-directed learning (SDL) but do not provide adequate guidance on how to address this requirement. Evidence: The model for the SDL mandate in physician training is based mostly on early childhood and secondary education evidence and literature, and may not capture the unique environment of medical training and clinical education. Furthermore, there is uncertainty about how medical schools and postgraduate training programs should implement and evaluate SDL educational interventions. The Shapiro Institute for Education and Research, in conjunction with the Association of American Medical Colleges, convened teams from eight medical schools from North America to address the challenge of defining, implementing, and evaluating SDL and the structures needed to nurture and support its development in health professional training. Implications: In this commentary, the authors describe SDL in Medical Education, (SDL-ME), which is a construct of learning and pedagogy specific to medical students and physicians in training. SDL-ME builds on the foundations of SDL and self-regulated learning theory, but is specifically contextualized for the unique responsibilities of physicians to patients, inter-professional teams, and society. Through consensus, the authors offer suggestions for training programs to teach and evaluate SDL-ME. To teach self-directed learning requires placing the construct in the context of patient care and of an obligation to society at large. The SDL-ME construct builds upon SDL and SRL frameworks and suggests SDL as foundational to health professional identity formation.KEYWORDSself-directed learning; graduate medical education; undergraduate medical education; theoretical frameworksSupplemental data for this article is available online at https://doi.org/10.1080/10401334.2021.1938074 .


Assuntos
Educação de Graduação em Medicina , Educação Médica , Estudantes de Medicina , Pré-Escolar , Adulto , Humanos , Aprendizagem , Currículo
4.
Med Teach ; 43(7): 817-823, 2021 07.
Artigo em Inglês | MEDLINE | ID: mdl-34043931

RESUMO

The COVID-19 pandemic has disrupted many societal institutions, including health care and education. Although the pandemic's impact was initially assumed to be temporary, there is growing conviction that medical education might change more permanently. The International Competency-based Medical Education (ICBME) collaborators, scholars devoted to improving physician training, deliberated how the pandemic raises questions about medical competence. We formulated 12 broad-reaching issues for discussion, grouped into micro-, meso-, and macro-level questions. At the individual micro level, we ask questions about adaptability, coping with uncertainty, and the value and limitations of clinical courage. At the institutional meso level, we question whether curricula could include more than core entrustable professional activities (EPAs) and focus on individualized, dynamic, and adaptable portfolios of EPAs that, at any moment, reflect current competence and preparedness for disasters. At the regulatory and societal macro level, should conditions for licensing be reconsidered? Should rules of liability be adapted to match the need for rapid redeployment? We do not propose a blueprint for the future of medical training but rather aim to provoke discussions needed to build a workforce that is competent to cope with future health care crises.


Assuntos
COVID-19 , Educação Médica , Internato e Residência , Competência Clínica , Educação Baseada em Competências , Currículo , Objetivos , Humanos , Pandemias , SARS-CoV-2
5.
Acad Med ; 96(2): 199-204, 2021 02 01.
Artigo em Inglês | MEDLINE | ID: mdl-33060399

RESUMO

The iconic Miller's pyramid, proposed in 1989, characterizes 4 levels of assessment in medical education ("knows," "knows how," "shows how," "does"). The frame work has created a worldwide awareness of the need to have different assessment approaches for different expected outcomes of education and training. At the time, Miller stressed the innovative use of simulation techniques, geared at the third level ("shows how"); however, the "does" level, assessment in the workplace, remained a largely uncharted area. In the 30 years since Miller's conference address and seminal paper, much attention has been devoted to procedures and instrument development for workplace-based assessment. With the rise of competency-based medical education (CBME), the need for approaches to determine the competence of learners in the clinical workplace has intensified. The proposal to use entrustable professional activities as a framework of assessment and the related entrustment decision making for clinical responsibilities at designated levels of supervision of learners (e.g., direct, indirect, and no supervision) has become a recent critical innovation of CBME at the "does" level. Analysis of the entrustment concept reveals that trust in a learner to work without assistance or supervision encompasses more than the observation of "doing" in practice (the "does" level). It implies the readiness of educators to accept the inherent risks involved in health care tasks and the judgment that the learner has enough experience to act appropriately when facing unexpected challenges. Earning this qualification requires qualities beyond observed proficiency, which led the authors to propose adding the level "trusted" to the apex of Miller's pyramid.


Assuntos
Competência Clínica/normas , Educação Baseada em Competências/métodos , Tomada de Decisões/ética , Confiança/psicologia , Atitude do Pessoal de Saúde , Conscientização , Educação/normas , Educação Médica/normas , Educação de Pós-Graduação em Medicina/métodos , Avaliação Educacional/métodos , Humanos , Aprendizagem/fisiologia , Local de Trabalho/organização & administração
6.
Acad Med ; 95(9): 1305-1307, 2020 09.
Artigo em Inglês | MEDLINE | ID: mdl-32324640

RESUMO

In this Invited Commentary, the author considers the February 2020 announcement that scoring on the United States Medical Licensing Examination (USMLE) Step 1 will change to pass/fail no sooner than January 2022 and its effects on the transition to residency process in the context of both the recommendations of the Invitational Conference on USMLE Scoring (InCUS) held in March 2019 and the disruptions caused by the COVID-19 pandemic in the spring of 2020. The author suggests that the medical education community must embrace any positive changes that come about as a result of the pandemic while continuing to systematically review the strengths and areas for improvement in the current transition to residency process.In its recommendations, InCUS provided a thoughtful set of action priorities and an effective process to work together, which can inform and guide the work ahead. The COVID-19 pandemic is dominating the educational and clinical environments and is now the biggest disruptor in all aspects of life, not just medical education. It is the responsibility of leaders in medical education to have a vision for and then implement an improved continuum of education that maintains the core values of the field and fits the health care delivery needs of today and the future.


Assuntos
Infecções por Coronavirus/epidemiologia , Avaliação Educacional/normas , Internato e Residência , Pneumonia Viral/epidemiologia , Betacoronavirus , COVID-19 , Competência Clínica/normas , Humanos , Licenciamento em Medicina , Pandemias , SARS-CoV-2 , Estudantes de Medicina , Estados Unidos
7.
Acad Med ; 95(9S A Snapshot of Medical Student Education in the United States and Canada: Reports From 145 Schools): S2-S4, 2020 09.
Artigo em Inglês | MEDLINE | ID: mdl-33626632

RESUMO

For the third time this century, the Association of American Medical Colleges has coordinated a collection of reports from their member medical schools that collectively reflect the state of medical education in the United States and Canada. This introduction to the September 2020 supplement to Academic Medicine provides an overview of the collection, with 145 out of 171 eligible medical schools participating in the project. The authors observe trends and similarities across the reports from participating schools, structuring the introduction to mirror the main questions posed to the schools: highlights of each school's medical education program, curriculum description, curricular governance, education staff, faculty development and support in medical education, regional medical campuses, and initiatives in progress. Key findings from the authors include expansion of student enrichment tracks, early clinical encounters, focus on wellness, expansion in competency-based medical education, and continued evolution of approaches to assessment. The authors note that this supplement was produced before COVID-19, and although it robustly chronicles the prepandemic state of medical education, medical education has already evolved and will continue to do so. This view offers important opportunities to observe and study changes in the curricula.


Assuntos
Currículo , Educação de Graduação em Medicina , Docentes de Medicina , Desenvolvimento de Pessoal , Canadá , Humanos , Inquéritos e Questionários , Estados Unidos
8.
Acad Med ; 93(3S Competency-Based, Time-Variable Education in the Health Professions): S27-S31, 2018 03.
Artigo em Inglês | MEDLINE | ID: mdl-29485484

RESUMO

As competency-based medical education is adopted across the training continuum, discussions regarding time-variable medical education have gained momentum, raising important issues that challenge the current regulatory environment and infrastructure of both undergraduate and graduate medical education in the United States. Implementing time-variable medical training will require recognizing, revising, and potentially reworking the multiple existing structures and regulations both internal and external to medical education that are not currently aligned with this type of system. In this article, the authors explore the impact of university financial structures, hospital infrastructures, national accrediting body standards and regulations, licensure and certification requirements, government funding, and clinical workforce models in the United States that are all intimately tied to discussions about flexible training times in undergraduate and graduate medical education. They also explore the implications of time-variable training to learners' transitions between medical school and residency, residency and fellowship, and ultimately graduate training and independent practice. Recommendations to realign existing structures to support and enhance competency-based, time-variable training across the continuum and suggestions for additional experimentation/demonstration projects to explore new training models are provided.


Assuntos
Educação Baseada em Competências/legislação & jurisprudência , Educação Baseada em Competências/normas , Educação Médica/métodos , Faculdades de Medicina/legislação & jurisprudência , Faculdades de Medicina/normas , Acreditação/legislação & jurisprudência , Certificação/legislação & jurisprudência , Educação Médica/legislação & jurisprudência , Educação Médica/normas , Avaliação Educacional/normas , Humanos , Internato e Residência/legislação & jurisprudência , Internato e Residência/normas , Licenciamento/legislação & jurisprudência , Estados Unidos
10.
J Med Regul ; 104(4): 23-31, 2018 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-30984914

RESUMO

This article reports the consensus recommendations of a working group that was convened at the end of a 4-year research project funded by the National Institutes of Health that examined 280 cases of egregious ethical violations in medical practice. The group reviewed data from the parent project, as well as other research on sexual abuse of patients, criminal prescribing of controlled substances, and unnecessary invasive procedures that were prosecuted as fraud. The working group embraced the goals of making such violations significantly less frequent and, when they do occur, identifying them sooner and taking necessary steps to ensure they are not repeated. Following review of data and previously published recommendations, the working group developed 10 recommendations that provide a starting point to meet these goals. Recommendations address leadership, oversight, tracking, disciplinary actions, education of patients, partnerships with law enforcement, further research and related matters. The working group recognized the need for further refinement of the recommendations to ensure feasibility and appropriate balance between protection of patients and fairness to physicians. While full implementation of appropriate measures will require time and study, we believe it is urgent to take visible actions to acknowledge and address the problem at hand.

11.
J Natl Compr Canc Netw ; 14(2): 153-62, 2016 02.
Artigo em Inglês | MEDLINE | ID: mdl-26850485

RESUMO

The NCCN Guidelines for Genetic/Familial High-Risk Assessment: Breast and Ovarian provide recommendations for genetic testing and counseling and risk assessment and management for hereditary cancer syndromes. Guidelines focus on syndromes associated with an increased risk of breast and/or ovarian cancer and are intended to assist with clinical and shared decision-making. These NCCN Guidelines Insights summarize major discussion points of the 2015 NCCN Genetic/Familial High-Risk Assessment: Breast and Ovarian panel meeting. Major discussion topics this year included multigene testing, risk management recommendations for less common genetic mutations, and salpingectomy for ovarian cancer risk reduction. The panel also discussed revisions to genetic testing criteria that take into account ovarian cancer histology and personal history of pancreatic cancer.


Assuntos
Neoplasias da Mama/genética , Neoplasias Ovarianas/genética , Feminino , Aconselhamento Genético/métodos , Predisposição Genética para Doença/genética , Testes Genéticos/métodos , Humanos , Mutação/genética , Síndromes Neoplásicas Hereditárias/genética , Neoplasias Pancreáticas/genética , Medição de Risco/métodos , Fatores de Risco
12.
J Natl Compr Canc Netw ; 12(9): 1326-38, 2014 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-25190698

RESUMO

During the past few years, several genetic aberrations that may contribute to increased risks for development of breast and/or ovarian cancers have been identified. The NCCN Guidelines for Genetic/Familial High-Risk Assessment: Breast and Ovarian focus specifically on the assessment of genetic mutations in BRCA1/BRCA2, TP53, and PTEN, and recommend approaches to genetic testing/counseling and management strategies in individuals with these mutations. This portion of the NCCN Guidelines includes recommendations regarding diagnostic criteria and management of patients with Cowden Syndrome/PTEN hamartoma tumor syndrome.


Assuntos
Síndrome do Hamartoma Múltiplo/diagnóstico , Síndrome do Hamartoma Múltiplo/genética , Gerenciamento Clínico , Feminino , Aconselhamento Genético , Testes Genéticos , Mutação em Linhagem Germinativa , Humanos , Masculino
13.
J Clin Nurs ; 22(19-20): 2778-86, 2013 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-23600967

RESUMO

AIMS AND OBJECTIVES: To explore health care professionals' perspective of hospice at home service that has different components, individually tailored to meet the needs of patients. BACKGROUND: Over 50% of adults diagnosed with a terminal illness and the majority of people who have cancer, prefer to be cared for and to die in their own home. Despite this, most deaths occur in hospital. Increasing the options available for patients, including their place of care and death is central to current UK policy initiatives. Hospice at home services aim to support patients to remain at home, yet there are wide variations in the design of services and delivery. A hospice at home service was developed to provide various components (accompanied transfer home, crisis intervention and hospice aides) that could be tailored to meet the individual needs of patients. DESIGN: An evaluation study. METHODS: Data were collected from 75 health care professionals. District nurses participated in one focus group (13) and 31 completed an electronic survey. Palliative care specialist nurses participated in a focus group (9). One hospital discharge co-ordinator and two general practitioners participated in semi-structured interviews and a further 19 general practitioners completed the electronic survey. RESULTS: Health care professionals reported the impact and value of each of the components of the service, as helping to support patients to remain at home, by individually tailoring care. They also positively reported that support for family carers appeared to enable them to continue coping, rapid access to the service was suggested to contribute to faster hospital discharges and the crisis intervention service was identified as helping patients remain in their own home, where they wanted to be. CONCLUSIONS: Health care professionals perceived that the additional individualised support provided by this service contributed to enabling patients to continue be cared for and to die at home in their place of choice. RELEVANCE TO CLINICAL PRACTICE: This service offers various components of a hospice at home service, enabling a tailor made package to meet individual and local area needs. Developing an individually tailored package of care appears to be able to meet specific needs.


Assuntos
Atitude do Pessoal de Saúde , Pessoal de Saúde/psicologia , Serviços de Assistência Domiciliar/organização & administração , Hospitais para Doentes Terminais , Assistência Terminal , Humanos
14.
Nurse Educ Today ; 33(12): 1550-6, 2013 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-23398914

RESUMO

BACKGROUND: Good communication skills in healthcare professionals are acknowledged as a core competency. The consequences of poor communication are well-recognised with far reaching costs including; reduced treatment compliance, higher psychological morbidity, incorrect or delayed diagnoses, and increased complaints. The Simple Skills Secrets is a visual, easily memorised, model of communication for healthcare staff to respond to the distress or unanswerable questions of patients, families and colleagues. OBJECTIVES: To explore the impact of the Simple Skills Secrets model of communication training on the general healthcare workforce. DESIGN AND METHODS: An evaluation methodology encompassing a quantitative pre- and post-course testing of confidence and willingness to have conversations with distressed patients, carers and colleagues and qualitative semi-structured telephone interviews with participants 6-8 weeks post course. PARTICIPANTS: During the evaluation, 153 staff undertook the training of which 149 completed the pre- and post-training questionnaire. A purposive sampling approach was adopted for the follow up qualitative interviews and 14 agreed to participate. RESULTS: There is a statistically significant improvement in both willingness and confidence for all categories; (overall confidence score, t(148)=-15.607, p=<0.05 overall willingness score, t(148)=-10.878, p=<0.05) with the greatest improvement in confidence in communicating with carers (pre-course mean 6.171 to post course mean 8.171). There is no statistical significant difference between the registered and support staff. Several themes were obtained from the qualitative data, including: a method of communicating differently, a structured approach, thinking differently and additional skills. The value of the model in clinical practice was reported. CONCLUSION: This model can be suggested as increasing the confidence of staff, in dealing with a myriad of situations which, if handled appropriately can lead to increased patient and carers' satisfaction. Empowering staff appears to have increased their willingness to undertake these conversations, which could lead to earlier intervention and minimise distress.


Assuntos
Comunicação , Educação em Enfermagem/organização & administração , Capacitação em Serviço , Relações Interpessoais , Modelos Educacionais , Relações Enfermeiro-Paciente , Competência Profissional , Relações Profissional-Família , Humanos , Entrevistas como Assunto , Modelos de Enfermagem , Inquéritos e Questionários
15.
Int J Dermatol ; 51(6): 693-6, 2012 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-22607287

RESUMO

Acro-dermato-ungual-lacrimal-tooth (ADULT) syndrome is a rare, autosomal dominant form of ectodermal dysplasia due to TP63 mutations. ADULT syndrome is much less common than the more classical forms of TP63-associated ectodermal dysplasias, such as ectrodactyly-ectodermal dysplasia-cleft lip/palate (EEC) syndrome and ankyloblepharon-ectodermal defects-cleft lip/palate syndrome. ADULT syndrome is characterized by ectrodactyly, syndactyly, and excessive freckling, in addition to more typical ectodermal defects, including hypodontia, lacrimal duct anomalies, hypotrichosis, and onychodysplasia. Unlike some of the other TP63-associated ectodermal dysplasias, ADULT syndrome lacks clefting and ankyloblepharon. Here, we report a three-generation family with ADULT syndrome due to an R243W mutation in TP63, a mutation that has previously been described in one patient with ADULT syndrome and eight unrelated patients with EEC syndrome.


Assuntos
Anodontia/genética , Displasia Ectodérmica/genética , Obstrução dos Ductos Lacrimais/genética , Deformidades Congênitas dos Membros/genética , Mutação , Unhas Malformadas/genética , Transtornos da Pigmentação/genética , Fatores de Transcrição/genética , Proteínas Supressoras de Tumor/genética , População Negra , Mama/anormalidades , Criança , Éxons , Feminino , Humanos
16.
Endocr Pract ; 17(3): e63-7, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-21454242

RESUMO

OBJECTIVE: To describe a novel germline missense mutation in exon 2 of the MEN1 gene identified in a man with multiple endocrine neoplasia type 1 (MEN 1). METHODS: We describe the patient's clinical, laboratory, and genetic data, and we review the relevant literature. RESULTS: A 41-year-old man with a history of primary hyperparathyroidism and left lower parathyroidectomy presented with nausea, vomiting, and hematemesis. Laboratory data revealed an elevated gastrin level. Computed tomography of the abdomen demonstrated a 3.5-cm mass in the head of pancreas. A functional study with a somatostatin receptor scan showed increased uptake in the region of the pancreatic mass. The patient's symptoms promptly improved after the Whipple procedure, although he was also noted to have a markedly elevated calcium concentration along with inappropriately elevated parathyroid hormone levels. Sestamibi scan identified a hyperfunctioning right upper parathyroid gland. His calcium level normalized after parathyroidectomy, and results from pituitary hormone studies were all normal. Genetic testing of the MEN1 gene identified a novel mutation: Arg52Gly. The Arg52Gly mutation replaces the normal arginine residue (CGC) with a glycine residue (GGC) at position 52 of the resultant menin protein. This mutation was present in family members from 3 generations. CONCLUSIONS: We report a novel disease-causing germline missense mutation in exon 2 of the MEN1 gene in a patient with MEN 1. Nonconservative replacement of arginine, a small, neutral amino acid, with glycine, a bulky positively charged amino acid, could potentially have a deleterious effect on the menin protein.


Assuntos
Neoplasia Endócrina Múltipla Tipo 1/genética , Mutação de Sentido Incorreto , Proteínas Proto-Oncogênicas/genética , Adulto , Análise Mutacional de DNA , Mutação em Linhagem Germinativa , Humanos , Hiperparatireoidismo Primário/genética , Masculino
18.
Acad Med ; 85(6): 947-58, 2010 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-20505392

RESUMO

PURPOSE: To describe trends in specialty choice and to identify predictors of primary care specialty choices among graduates of U.S. MD-granting medical schools. METHOD: A longitudinal study evaluated 1997-2006 medical school graduates who completed the Association of American Medical Colleges' Matriculating Student Questionnaire and Graduation Questionnaire. Multivariate logistic regression identified significant predictors of graduates' choice of primary care specialty (general internal medicine, general pediatrics, internal medicine subspecialties, pediatrics subspecialties, family medicine, and obstetrics-gynecology) or "no-board-certification specialty," compared with all other specialties (reference). RESULTS: The sample included 102,673 graduates (64.9% of all 1997-2006 graduates). General internal medicine, family medicine, general pediatrics, and obstetrics-gynecology choice decreased, whereas internal medicine subspecialties, pediatrics subspecialties, and no-board-certification specialty choice increased over time (each: P < .001). Female graduates and those who planned to practice in underserved communities, espoused more-altruistic beliefs about health care, and ascribed greater importance to social responsibility in their choice of medicine at matriculation were more likely to choose general internal medicine, general pediatrics, family medicine, or obstetrics-gynecology, whereas graduates who had a physician parent and who planned full-time academic medicine careers were less likely to do so (each: P < .01). Graduates with higher debt were less likely to choose internal medicine and pediatrics specialties (each: P < .001) and more likely to choose obstetrics-gynecology (P = .001). CONCLUSIONS: Generalist-primary care specialty choices declined since 1997, whereas primary care subspecialty and no-board-certification specialty choices increased. Associations between primary care specialty choices and demographic, attitudinal, and career intention variables can inform the design of interventions to address expected primary care workforce shortages.


Assuntos
Escolha da Profissão , Atenção Primária à Saúde , Feminino , Humanos , Estudos Longitudinais , Masculino , Medicina , Especialização , Estudantes de Medicina/psicologia , Inquéritos e Questionários , Estados Unidos
19.
Fam Cancer ; 8(4): 501-4, 2009.
Artigo em Inglês | MEDLINE | ID: mdl-19672700

RESUMO

We assessed mismatch repair by immunohistochemistry (IHC) and microsatellite instability (MSI) analysis in an early onset endometrial cancer and a sister's colon cancer. We demonstrated high-level MSI and normal expression for MLH1, MSH2 and MSH6. PMS2 failed to stain in both tumors, strongly implicating a PMS2 defect. This family did not meet clinical criteria for Lynch syndrome. However, early onset endometrial cancers in the proband and her sister, a metachronous colorectal cancer in the sister as well as MSI in endometrial and colonic tumors suggested a heritable mismatch repair defect. PCR-based direct exonic sequencing and multiplex ligation-dependent probe amplification (MLPA) were undertaken to search for PMS2 mutations in the germline DNA from the proband and her sister. No mutation was identified in the PMS2 gene. However, PMS2 exons 3, 4, 13, 14, 15 were not evaluated by MLPA and as such, rearrangements involving those exons cannot be excluded. Clinical testing for MLH1 and MSH2 mutation revealed a germline deletion of MLH1 exons 14 and 15. This MLH1 germline deletion leads to an immunodetectable stable C-terminal truncated MLH1 protein which based on the IHC staining must abrogate PMS2 stabilization. To the best of our knowledge, loss of PMS2 in MLH1 truncating mutation carriers that express MLH1 in their tumors has not been previously reported. This family points to a potential limitation of IHC-directed gene testing for suspected Lynch syndrome and the need to consider comprehensive MLH1 testing for individuals whose tumors lack PMS2 but for whom PMS2 mutations are not identified.


Assuntos
Proteínas Adaptadoras de Transdução de Sinal/genética , Adenosina Trifosfatases/genética , Neoplasias Colorretais Hereditárias sem Polipose/genética , Enzimas Reparadoras do DNA/genética , Proteínas de Ligação a DNA/genética , Testes Genéticos/métodos , Proteínas Nucleares/genética , Neoplasias do Endométrio/genética , Epitopos , Feminino , Humanos , Imuno-Histoquímica , Instabilidade de Microssatélites , Pessoa de Meia-Idade , Endonuclease PMS2 de Reparo de Erro de Pareamento , Proteína 1 Homóloga a MutL , Proteína 2 Homóloga a MutS/genética , Linhagem , Reação em Cadeia da Polimerase
20.
Science ; 325(5943): 965, 2009 Aug 21.
Artigo em Inglês | MEDLINE | ID: mdl-19556464

RESUMO

Pleuropulmonary blastoma (PPB) is a rare pediatric lung tumor that is often part of an inherited cancer syndrome. PPBs consist of mesenchymal cells that are susceptible to malignant transformation and cysts lined by epithelial cells. In a subset of patients, overgrowth of the cysts by mesenchymal cells leads to sarcoma formation. Here, we show that 11 multiplex PPB families harbor heterozygous germline mutations in DICER1, a gene encoding an endoribonuclease critical to the generation of small noncoding regulatory RNAs. Expression of DICER1 protein was undetectable in the epithelial component of PPB tumors but was retained in the malignant mesenchyme (sarcoma). We hypothesize that loss of DICER1 in the epithelium of the developing lung alters the regulation of diffusible factors that promote mesenchymal proliferation.


Assuntos
RNA Helicases DEAD-box/genética , Mutação em Linhagem Germinativa , Neoplasias Pulmonares/genética , Blastoma Pulmonar/genética , Ribonuclease III/genética , RNA Helicases DEAD-box/química , Epitélio/metabolismo , Feminino , Predisposição Genética para Doença , Heterozigoto , Humanos , Neoplasias Pulmonares/enzimologia , Neoplasias Pulmonares/patologia , Masculino , Linhagem , Blastoma Pulmonar/enzimologia , Blastoma Pulmonar/patologia , Ribonuclease III/química
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