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RESUMEN Introducción: La Radiobiología es la ciencia perteneciente a la biología que estudia los efectos de los distintos tipos de radiación sobre la materia viva. Objetivo: Identificar la evidencia científica respecto a la radioterapia del paciente con cáncer en la región maxilofacial. Métodos : Se realizó una revisión de la de literatura acerca del tema en motores de búsqueda como: las bases de datos electrónicas PubMed, Medline, Cochrane, Hinari y SciELO. Para la búsqueda de la información se utilizaron las palabras clave: cáncer de cabeza y cuello, tratamiento del cáncer de la región maxilofacial, radioterapia, braquiterapia y tipos de radioterapia. Resultados: Para el tratamiento se necesita evaluar las características del tumor y determinar el estadio tumoral, la localización y extensión de la enfermedad, así como los hallazgos patológicos que dictan la conducta adecuada como la cirugía, radioterapia, quimioterapia, terapia hormonal, inmunoterapia y terapia dirigida. La dosis máxima tolerada en relación con los órganos críticos oscila entre 50 y 76 Gy. Con la braquiterapia se puede colocar la fuente radiactiva dentro del paciente en cavidades anatómicas cerca del tumor o en el lecho tumoral. Esto permite administrar dosis elevadas de irradiación muy eficaces, al tumor o zona de riesgo. Los efectos adversos de las radiaciones ionizantes según la célula afectada pueden ser daño genético y somático. Conclusiones: En el tratamiento del cáncer la radioterapia es una opción primordial, siempre con el precepto que ofrezca buenos resultados en cuanto a eficacia, tolerabilidad y calidad de vida, al causar el menor daño posible a los enfermos y con las nuevas tecnologías puede incrementar el éxito y garantizar que el procedimiento continúe con calidad.
Introduction: Radiobiology is the science belonging to the biology that studies the effects of the different types of radiation on the lively matter. Objective: Identifying the scientific evidence in relation to radiation therapy of the patient with cancer of the maxillofacial region. Methods: A literature revision was carried out in search engines as: The electronic data bases PubMed, Medline, Cochrane, Hinari, and SciELO. For the search for information the key words used were head and neck cancer, treatment of the cancer of the maxillofacial region, radiation therapy, brachytherapy and types of radiation therapy. Results: For the treatment it is needed to evaluate the characteristics of the tumor and to determine the tumor stage, the location and extension of disease, as well as the pathological findings that dictate the conduct made suitable like the surgery, radiation therapy, chemotherapy, hormonal therapy, immunotherapy and directive therapy. The maximum dose tolerated relating to the critical organs oscillates between 50 and 76 Gy. With the brachytherapy the radioactive source inside the patient can place itself in reservoirs, close to the tumor or in the tumor area. This allows managing dose lifted of irradiation very effective, to the tumor or zone of risk. The adverse effects of the ionizing radiations according to the impaired cell can be genetic and somatic damage. Conclusions: In the treatment of cancer, radiation therapy is a primary option, always with the precept that offers good results as to efficacy, tolerance and quality of life, causing the smaller possible damage to the sick and with the new technologies it can increase success and guarantee that a procedure keeps on being high-quality.
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Radiation?induced brain injury is a common adverse reaction to radiotherapy for head and neck carcinoma, and may develop into radiation?induced brain necrosis in some patients. The disease has a substantial impact on the quality of life and 5?year survival in patients. Early diagnosis and prevention are important for the clinical treatment of radiation?induced brain injury. On the other hand, recurrence and pseudoprogression as complications of malignant tumor radiotherapy are also key problems for clinical diagnosis and identification of radiation?induced brain injury. Magnetic resonance imaging ( MRI) , especially functional MRI, provides an important approach for basic and clinical studies of radiation?induced brain injury.
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Objective To evaluate the risk of locoregional recurrence (LRR) and the influencing factors for long-term survival in patients with epithelial-myoepithelial carcinoma (EMCa).Methods A retrospective analysis was performed for 18 EMCa patients, who received initial therapy or initial adjuvant therapy in our hospital from 1999 to 2015, to investigate their survival.Among these patients, 8(44%) underwent surgery alone, 9(50%) received adjuvant radiotherapy, and 1(6%) received radical concurrent chemoradiotherapy.Locoregional recurrence-free survival (LRFS) and overall survival (OS) rates were compared between these groups.The Kaplan-Meier mtthod was used to calculated survival rates and log-rank test was used to compare the LRFS.Results With a median follow-up time of 46 months, 5 patients developed LRR, and the 5-year LRFS and OS rates were 69% and 93%, respectively.The patients treated with radiotherapy had a significantly higher 5-year LRRFS rate than those not treated with radiotherapy (71% vs.57%, P=0.569).Conclusions LRR is the main failure mode of EMCa treatment, and further improving local control is the key to improved survival.
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Radiotherapy is an important therapeutic method in the management of head and neck cancer.However,since the head and neck region has many important functions of the human body,radiotherapy may cause serious sequelae.Proton and heavy ion radiotherapies have better radiophysical and biological properties compared with conventional proton beam and are beneficial to tumor control and protection of normal tissue.The advantages of proton and heavy ion radiotherapies have been demonstrated in soft tissue tumors (especially skull base chordoma and chondrosarcoma),malignant melanoma,and adenoid cystic carcinoma resistant to conventional protons in the head and neck region,and the safety of proton and heavy ion radiotherapies have been confirmed in reirradiation for recurrent tumors.
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INTRODUÇÃO: Quimiorradioterapia (QRT) concomitante adjuvante aumenta a sobrevida livre de doença (SLD) em pacientes portadores de carcinoma epidermóide de cabeça e pescoço (CECCP) de alto risco operados com intenção curativa, porém está associada a toxicidade não desprezível e seu impacto na sobrevida global (SG) é incerto. ERCC1 (Excision Repair Cross Complementing Group 1) é uma proteína com função crítica no reparo de DNA por excisão de nucleotídeos (NER) e está envolvido na resistência à quimio- e radioterapia. Neste trabalho tivemos como objetivos determinar a expressão da proteína ERCC1, a expressão do RNA mensageiro (mRNA) de ERCC1 e a ocorrência do polimorfismo de nucleotídeo único T19007C de ERCC1 em pacientes portadores de CECCP de alto risco, operados e tratados com QRT adjuvante, bem como o valor prognóstico destes marcadores. MÉTODOS: Trata-se de um estudo retrospectivo em pacientes portadores de CEC de cavidade oral, orofaringe, hipofaringe ou laringe, operados com intenção curativa e portadores de doença de risco alto ou intermediário. Pacientes elegíveis haviam sido tratados com QRT adjuvante: 60-70 Gy e cisplatina concomitante (100 mg/m2, dias 1, 22 e 43), não apresentavam metástases a distância e nem sinais de recidiva após cirurgia. A expressão da proteína ERCC1 foi avaliada por imunohistoquímica, através de um escore H semiquantitativo, obtido pelo produto da intensidade da coloração nuclear (0-3) pelo escore proporcional atribuído à porcentagem estimada de núcleos corados (0;0,1;0,5;1). O método da transcrição reversa e reação em cadeia da polimerase (PCR) em tempo real quantitativo foi utilizado para determinação da expressão do mRNA de ERCC1 em tecido de tumor primário, normalizada em relação à expressão da fração 18S do RNA ribossomal. Genotipagem de ERCC1 (códon 118) foi realizada por PCR - polimorfismo do tamanho do fragmento de restrição a partir de DNA genômico extraído de linfonodos normais destes pacientes, após digestão com...
BACKGROUND: Adjuvant concurrent chemoradiation (CRT) improves diseasefree survival (DFS) in patients diagnosed with head and neck squamous cell carcinoma (HNSCC) presenting with high-risk features treated with surgery with curative intent, but treatment-related toxicity is not negligible and its impact on overall survival (OS) is uncertain. ERCC1 (Excision Repair Cross Complementing Group 1) is a protein with a critical role in the nucleotide excision repair (NER) pathway, associated with resistance to chemo- and radiation therapy. We aimed here to study ERCC1 protein expression, ERCC1 messenger RNA (mRNA) expression and the single nucleotide polymorphism T19007C of ERCC1 as prognostic markers in HNSCC patients presenting with high-risk features treated with surgery and adjuvant CRT. METHODS: It is a retrospective study in patients with oral cavity, oropharynx, hypopharynx or larynx SCC submitted to radical surgery with curative intent and presenting with pathologic features of high- or intermediate-risk. Eligible patients were treated with adjuvant CRT: 60-70 Gy and concurrent cisplatin (100 mg/m2, days 1, 22 and 43), with no distant metastasis and no relapsed disease after surgery. ERCC1 protein expression was evaluated by immunohistochemistry, using a semi-quantitative H-score, calculated by multiplying the nuclear staining intensity (0-3) by the proportion score attributed to the percentage of positive tumor nuclei (0;0,1;0,5;1). Quantitative real-time reverse transcriptase polymerase chain reaction (PCR) assay was performed to determine ERCC1 mRNA expression in primary tumors tissue specimens. The ERCC1 mRNA expression was normalized using 18S fraction of ribosomal RNA expression as internal reference. ERCC1 (codon 118) genotypes were detected using PCR restriction fragment length polymorphism method carried out in genomic DNA extracted from normal lymph nodes. The PCR products were digested with BsrDI. RESULTS: 69 patients...