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1.
Int J Mol Sci ; 24(4)2023 Feb 09.
Artigo em Inglês | MEDLINE | ID: mdl-36834938

RESUMO

Early-onset colorectal cancer (EOCRC; age younger than 50 years) incidence has been steadily increasing in recent decades worldwide. The need for new biomarkers for EOCRC prevention strategies is undeniable. In this study, we aimed to explore whether an aging factor, such as telomere length (TL), could be a useful tool in EOCRC screening. The absolute leukocyte TL from 87 microsatellite stable EOCRC patients and 109 healthy controls (HC) with the same range of age, was quantified by Real Time Quantitative PCR (RT-qPCR). Then, leukocyte whole-exome sequencing (WES) was performed to study the status of the genes involved in TL maintenance (hTERT, TERC, DKC1, TERF1, TERF2, TERF2IP, TINF2, ACD, and POT1) in 70 sporadic EOCRC cases from the original cohort. We observed that TL was significantly shorter in EOCRC patients than in healthy individuals (EOCRC mean: 122 kb vs. HC mean: 296 kb; p < 0.001), suggesting that telomeric shortening could be associated with EOCRC susceptibility. In addition, we found a significant association between several SNPs of hTERT (rs79662648), POT1 (rs76436625, rs10263573, rs3815221, rs7794637, rs7784168, rs4383910, and rs7782354), TERF2 (rs251796 and rs344152214), and TERF2IP (rs7205764) genes and the risk of developing EOCRC. We consider that the measurement of germline TL and the status analysis of telomere maintenance related genes polymorphisms at early ages could be non-invasive methods that could facilitate the early identification of individuals at risk of developing EOCRC.


Assuntos
Neoplasias Colorretais , Detecção Precoce de Câncer , Telômero , Humanos , Pessoa de Meia-Idade , Neoplasias Colorretais/diagnóstico , Neoplasias Colorretais/genética , Incidência , Telômero/genética , Telômero/metabolismo , Biomarcadores Tumorais , Detecção Precoce de Câncer/métodos
2.
Lancet Oncol ; 22(5): 727-736, 2021 05.
Artigo em Inglês | MEDLINE | ID: mdl-33862002

RESUMO

BACKGROUND: Randomised, controlled trials and meta-analyses have shown the survival benefit of concomitant chemoradiotherapy or hyperfractionated radiotherapy in the treatment of locally advanced head and neck cancer. However, the relative efficacy of these treatments is unknown. We aimed to determine whether one treatment was superior to the other. METHODS: We did a frequentist network meta-analysis based on individual patient data of meta-analyses evaluating the role of chemotherapy (Meta-Analysis of Chemotherapy in Head and Neck Cancer [MACH-NC]) and of altered fractionation radiotherapy (Meta-Analysis of Radiotherapy in Carcinomas of Head and Neck [MARCH]). Randomised, controlled trials that enrolled patients with non-metastatic head and neck squamous cell cancer between Jan 1, 1980, and Dec 31, 2016, were included. We used a two-step random-effects approach, and the log-rank test, stratified by trial to compare treatments, with locoregional therapy as the reference. Overall survival was the primary endpoint. The global Cochran Q statistic was used to assess homogeneity and consistency and P score to rank treatments (higher scores indicate more effective therapies). FINDINGS: 115 randomised, controlled trials, which enrolled patients between Jan 1, 1980, and April 30, 2012, yielded 154 comparisons (28 978 patients with 19 253 deaths and 20 579 progression events). Treatments were grouped into 16 modalities, for which 35 types of direct comparisons were available. Median follow-up based on all trials was 6·6 years (IQR 5·0-9·4). Hyperfractionated radiotherapy with concomitant chemotherapy (HFCRT) was ranked as the best treatment for overall survival (P score 97%; hazard ratio 0·63 [95% CI 0·51-0·77] compared with locoregional therapy). The hazard ratio of HFCRT compared with locoregional therapy with concomitant chemoradiotherapy with platinum-based chemotherapy (CLRTP) was 0·82 (95% CI 0·66-1·01) for overall survival. The superiority of HFCRT was robust to sensitivity analyses. Three other modalities of treatment had a better P score, but not a significantly better HR, for overall survival than CLRTP (P score 78%): induction chemotherapy with taxane, cisplatin, and fluorouracil followed by locoregional therapy (ICTaxPF-LRT; 89%), accelerated radiotherapy with concomitant chemotherapy (82%), and ICTaxPF followed by CLRT (80%). INTERPRETATION: The results of this network meta-analysis suggest that further intensifying chemoradiotherapy, using HFCRT or ICTaxPF-CLRT, could improve outcomes over chemoradiotherapy for the treatment of locally advanced head and neck cancer. FUNDINGS: French Institut National du Cancer, French Ligue Nationale Contre le Cancer, and Fondation ARC.


Assuntos
Quimiorradioterapia , Neoplasias de Cabeça e Pescoço/terapia , Metanálise em Rede , Fracionamento da Dose de Radiação , Feminino , Neoplasias de Cabeça e Pescoço/mortalidade , Humanos , Masculino
3.
Artigo em Inglês | MEDLINE | ID: mdl-36981846

RESUMO

The increase in life expectancy and survival time implies an increase in the possible side-effects of pharmacological treatments in patients. Cancer-related fatigue is one of these side-effects. The main objective of this study was to evaluate the effects of a multimodal program of physical exercise and functional rehabilitation on asthenia, pain, functional capacity, and quality of life in cancer patients with cancer-related fatigue. METHODS: This was a randomized, parallel-controlled clinical trial, with two arms (experimental and control group), and it was conducted over the course of a year in the Oncology Hospitalization Unit at the University Hospital of Salamanca, Spain. Participants (n = 48) were assessed at three points during the study. The first assessment was prior to hospital discharge, the second assessment was after 15 days, and the final assessment was at one month post-hospital follow-up. The intervention lasted one month. The main variables studied were the dependency levels (Barthel), cancer-related fatigue (FACT-An), health-related quality of life (EuroQoL-5D), functional capacity (SPPB), and kinesiophobia (TSK-F). RESULTS: Sample size (n = 44). Mean age 63.46 ± 12.36 years. Significant differences between control and experimental group participants in Barthel, FACT-An, TSK-F, and SPPB scores at follow-up and final assessment. CONCLUSIONS: There are beneficial effects of a multimodal physical exercise and functional rehabilitation program in improving the autonomy of cancer-related fatigue patients.


Assuntos
Terapia por Exercício , Neoplasias , Modalidades de Fisioterapia , Idoso , Humanos , Pessoa de Meia-Idade , Fadiga/etiologia , Neoplasias/complicações , Neoplasias/reabilitação , Qualidade de Vida , Terapia Combinada , Resultado do Tratamento , Masculino , Feminino
4.
Reumatol Clin (Engl Ed) ; 17(10): 559-561, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34823820

RESUMO

SARS-CoV-2 is a new RNA virus which causes coronavirus disease 2019 (COVID-19), declared a pandemic by the World Health Organization (WHO). It triggers an atypical pneumonia that can progress to multiorgan failure. COVID-19 can cause dysregulation of the immune system, triggering an inflammatory response, and simulate haemophagocytic lymphohistiocytosis. Several studies have proposed that anti-IL-6 receptor antibodies, such as tocilizumab, play an important role in the treatment of severe acute respiratory infection associated with SARS-CoV-2. However, the role of anti-IL-1 receptor antibodies, such as anakinra, in the treatment of COVID-19 has not been established. We present a case report of a 51-year-old man diagnosed with severe respiratory infection associated with SARS-CoV-2 that was refractory to antiviral and anti-IL-6 treatment, with a favourable clinical outcome and analytical improvement after treatment with anti-IL-1 (anakinra).


Assuntos
Anticorpos Monoclonais Humanizados/uso terapêutico , Antivirais/uso terapêutico , Tratamento Farmacológico da COVID-19 , Proteína Antagonista do Receptor de Interleucina 1/uso terapêutico , Farmacorresistência Viral , Humanos , Masculino , Pessoa de Meia-Idade
5.
Front Oncol ; 11: 714550, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34692491

RESUMO

Targeting the immune system has emerged as an effective therapeutic strategy for the treatment of various tumor types, including Head and Neck Squamous Cell Carcinoma (HNSCC) and Non-small-Cell Lung Cancer (NSCLC), and checkpoint inhibitors have shown to improve patient survival in these tumor types. Unfortunately, not all cancers respond to these agents, making it necessary to identify responsive tumors. Several biomarkers of response have been described and clinically tested. As of yet what seems to be clear is that a pre-activation state of the immune system is necessary for these agents to be efficient. In this study, using established transcriptomic signatures, we identified a group of gene combination associated with favorable outcome in HNSCC linked to a higher presence of immune effector cells. CD2, CD3D, CD3E, and CXCR6 combined gene expression is associated with improved outcome of HNSCC patients and an increase of infiltrating immune effector cells. This new signature also identifies a subset of cervical squamous cell carcinoma (CSCC) patients with favorable prognosis, who show an increased presence of immune effector cells in the tumor, which outcome shows similarities with the HP-positive HNSCC cohort of patients. In addition, CD2, CD3D, CD3E, and CXCR6 signature is able to predict the best favorable prognosis in terms of overall survival of CSSC patients. Of note, these findings were not reproduced in other squamous cell carcinomas like esophageal SCC or lung SCC. Prospective confirmatory studies should be employed to validate these findings.

6.
Artigo em Inglês, Espanhol | MEDLINE | ID: mdl-32571730

RESUMO

SARS-CoV-2 is a new RNA virus which causes coronavirus disease 2019 (COVID-19), declared a pandemic by the World Health Organization (WHO). It triggers an atypical pneumonia that can progress to multiorgan failure. COVID-19 can cause dysregulation of the immune system, triggering an inflammatory response, and simulate haemophagocytic lymphohistiocytosis. Several studies have proposed that anti-IL-6 receptor antibodies, such as tocilizumab, play an important role in the treatment of severe acute respiratory infection associated with SARS-CoV-2. However, the role of anti-IL-1 receptor antibodies, such as anakinra, in the treatment of COVID-19 has not been established. We present a case report of a 51-year-old man diagnosed with severe respiratory infection associated with SARS-CoV-2 that was refractory to antiviral and anti-IL-6 treatment, with a favourable clinical outcome and analytical improvement after treatment with anti-IL-1 (anakinra).

9.
Ann Nucl Med ; 32(8): 568-572, 2018 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-30051167

RESUMO

Large cell neuroendocrine carcinoma of the lung (LCNEC) is a high-grade, poorly differentiated tumor that typically does not express somatostatin receptors. Thus, it does not benefit from treatment with somatostatin analogs and peptide receptor radionuclide therapy (PRRT). The current study objective was to demonstrate that treatment with PRRT may be a valid option in neuroendocrine carcinomas with high expression of somatostatin receptors. This is a case report of a 58-year-old man who was diagnosed with LCNEC and received chemotherapy treatment with little benefit. Extensive hepatic and bone metastasis was detected on 111In-pentetreotide scintigraphy following high uptake of the radionuclide by the tumors. The patient benefitted from neuroendocrine treatment initially and from lutetium Lu 177 dotatate subsequently. A significant clinical and radiological response was observed, along with an improvement in quality of life. The use of PRRT is a valid alternative to chemotherapy in patients with LCNEC involving the expression of somatostin receptors.


Assuntos
Neoplasias Pulmonares/radioterapia , Tumores Neuroendócrinos/radioterapia , Octreotida/análogos & derivados , Compostos Organometálicos/uso terapêutico , Humanos , Neoplasias Pulmonares/patologia , Masculino , Pessoa de Meia-Idade , Gradação de Tumores , Tumores Neuroendócrinos/patologia , Octreotida/uso terapêutico , Qualidade de Vida , Resultado do Tratamento
10.
Urology ; 117: 41-43, 2018 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-29702156

RESUMO

OBJECTIVE: To demonstrate that patients with Xp11.2/TFE3 gene-fusion translocation renal cell carcinoma (RCC), despite having an aggressive course in young adults, could have valid treatment options such as mammalian target of rapamycin (mTOR) inhibitors with good outcomes. Furthermore, to explain possible mechanisms of action of mTOR inhibitors in this type of RCC. MATERIALS AND METHODS: We report a case of a 44-year-old man who has been treated with everolimus for a Xp11.2 translocation/TFE3 gene-fusion RCC after 2 previous failed treatments with tyrosine kinase inhibitor. During the follow-up, we evaluated type and duration of response with everolimus. RESULTS: The patient obtained a long-lasting response of disease of 25 months with everolimus without any symptom. CONCLUSION: We believe that mTOR inhibitors could be a good line option treatment to consider for this type of patients.


Assuntos
Antineoplásicos/uso terapêutico , Fatores de Transcrição de Zíper de Leucina e Hélice-Alça-Hélix Básicos/genética , Carcinoma de Células Renais/tratamento farmacológico , Carcinoma de Células Renais/genética , Everolimo/uso terapêutico , Neoplasias Renais/tratamento farmacológico , Neoplasias Renais/genética , Translocação Genética , Adulto , Cromossomos Humanos X , Fusão Gênica , Humanos , Masculino , Intervalo Livre de Progressão , Serina-Treonina Quinases TOR/antagonistas & inibidores
11.
Cancer Lett ; 255(1): 71-6, 2007 Sep 18.
Artigo em Inglês | MEDLINE | ID: mdl-17482348

RESUMO

The correlation of erythropoietin (EPO) receptor levels with angiogenesis and progression in some cancers has suggested that EPO could acts directly as an angiogenic factor. The purpose of this study was to assess the effect of treatment with human recombinant erythropoietic (rHuEPO) agents in cancer patients with chemotherapy-induced anaemia on endoglin and vascular endothelial growth factor (VEGF) circulating levels as a possible marker of angiogenesis. Endoglin and VEGF were measured in serum samples from 25 cancer patients with chemotherapy-induced anemia before and after 3-4 weeks of treatment with rHuEPO. A group of 28 healthy voluntaries was used as control. VEGF serum levels were significantly higher in cancer patients than in controls. For endoglin, higher levels were observed without reaching statistical significance. No statistically significant differences in endoglin and VEGF serum levels were found between samples obtained before and after treatment with rHuEPO agents. In conclusion, our result do not support that rHuEpo treatment in anaemic cancer patients induce angiogenesis.


Assuntos
Anemia/complicações , Anemia/patologia , Antineoplásicos/farmacologia , Neoplasias/complicações , Neoplasias/metabolismo , Fator A de Crescimento do Endotélio Vascular/metabolismo , Adulto , Idoso , Antígenos CD/metabolismo , Endoglina , Eritropoese , Eritropoetina/metabolismo , Feminino , Humanos , Pessoa de Meia-Idade , Neovascularização Patológica , Estudos Prospectivos , Receptores de Superfície Celular/metabolismo , Proteínas Recombinantes/química
12.
J Comp Eff Res ; 6(6): 491-495, 2017 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-28959896

RESUMO

AIM: To assess whether the use of median overall survival to define clinically meaningful outcomes in the area of oncology could yield different decisions compared with those obtained with a more realistic measure such as individual survival. METHODS: Two scenarios that offered equivalent health gains/money spent were presented: 'median overall survival' scenario (new treatment provided small clinical benefits for the average population) and 'individual survival'scenario (new treatment provided substantial clinical benefits for a small percentage of the patients and no benefits for the rest). Responses from both scenarios were compared. RESULTS: Responses between the two scenarios were different for oncologists, healthcare policy makers and patients (p < 0.05). 'Individual survival' scenario obtained higher percentage of positive answers compared with 'median overall survival'. CONCLUSION: Expressing the benefits of new oncologic treatments in terms of 'individual survival' may yield to different healthcare decisions compared with the widely used median overall survival.


Assuntos
Neoplasias/mortalidade , Atitude do Pessoal de Saúde , Tomada de Decisão Clínica , Análise Custo-Benefício , Política de Saúde/economia , Humanos , Oncologia/economia , Oncologia/estatística & dados numéricos , Neoplasias/economia , Neoplasias/terapia , Oncologistas/psicologia , Satisfação do Paciente , Análise de Sobrevida , Resultado do Tratamento
13.
Artigo em Inglês | MEDLINE | ID: mdl-26719677

RESUMO

BACKGROUND: In oncology, establishing the value of new cancer treatments is challenging. A clear definition of the different perspectives regarding the drivers of innovation in oncology is required to enable new cancer treatments to be properly rewarded for the value they create. The aim of this study was to analyze the views of oncologists, health care policy makers, patients, and the general population regarding the value of new cancer treatments. METHODS: An exploratory and qualitative study was conducted through structured interviews to assess participants' attitudes toward cost and outcomes of cancer drugs. First, the participants were asked to indicate the minimum survival benefit that a new treatment should have to be funded by the Spanish National Health System (NHS). Second, the participants were requested to state the highest cost that the NHS could afford for a medication that increases a patient's quality of life (QoL) by twofold with no changes in survival. The responses were used to calculate incremental cost-effectiveness ratios (ICERs). RESULTS: The minimum improvement in patient survival means that justified inclusions into the NHS were 5.7, 8.2, 9.1, and 10.4 months, which implied different ICERs for oncologists (€106,000/quality-adjusted life year [QALY]), patients (€73,520/QALY), the general population (€66,074/QALY), and health care policy makers (€57,471/QALY), respectively. The costs stated in the QoL-enhancing scenario were €33,167, €30,200, €26,000, and €17,040, which resulted in ICERs of €82,917/QALY for patients, €75,500/QALY for the general population, €65,000/QALY for oncologists, and €42,600/QALY for health care policy makers, respectively. CONCLUSION: All estimated ICER values were higher than the thresholds previously described in the literature. Oncologists most valued gains in survival, whereas patients assigned a higher monetary value to treatments that enhanced QoL. Health care policy makers were less likely to pay more for therapeutic improvements compared to the remaining participants.

14.
Adv Ther ; 33(11): 2059-2068, 2016 11.
Artigo em Inglês | MEDLINE | ID: mdl-27718158

RESUMO

INTRODUCTION: The purpose of this study was to explore the main factors explaining the relative weight of the different attributes that determine the value of oncologic treatments from the different perspectives of healthcare policy makers (HCPM), oncologists, patients and the general population in Spain. METHODS: Structured interviews were conducted to assess: (1) the importance of the attributes on treatment choice when comparing a new cancer drug with a standard cancer treatment; (2) the importance of survival, quality of life (QoL), costs and innovation in cancer; and (3) the most worrying side effects related to cancer drugs. RESULTS: A total of 188 individuals participated in the study. For all participants, when choosing treatments, the best rated characteristics were greater efficacy, greater safety, treatment adaptation to patients' individual requirements and the rapid reincorporation of patients to their daily activities. There were important differences among participants in their opinion about survival, QoL and cost. In general, oncologists, patients, and the general population gave greater value to gains in QoL than healthcare policy makers. Compared to other participants healthcare policy makers gave greater importance to the economic impact related to oncology treatments. CONCLUSIONS: Gains in QoL, survival, safety, cost and innovation are perceived differently by different groups of stakeholders. It is recommended to consider the perspective of different stakeholders in the assessment of a new cancer drugs to obtain more informed decisions when deciding on the most appropriate treatment to use. FUNDING: Eli Lilly & Co, Madrid (Spain).


Assuntos
Antineoplásicos , Oncologia , Neoplasias/tratamento farmacológico , Qualidade de Vida , Terapias em Estudo/psicologia , Pessoal Administrativo/psicologia , Antineoplásicos/efeitos adversos , Antineoplásicos/economia , Antineoplásicos/uso terapêutico , Atitude do Pessoal de Saúde , Análise Custo-Benefício , Feminino , Humanos , Masculino , Oncologia/economia , Oncologia/métodos , Neoplasias/economia , Neoplasias/psicologia , Oncologistas/psicologia , Percepção Social , Espanha
15.
Clin Transl Oncol ; 7(9): 412-3, 2005 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-16238977

RESUMO

Prostate-specific antigen (PSA) is the most commonly used tumour marker for prostate cancer, both in screening and in follow-up. However, there are many false positive increases in the presence of other prostate diseases and, currently, there is no consensus regarding sensitivity and specificity of the PSA test, nor what constitutes the upper limit of normality. We report a case of a 67-year-old patient with metastatic prostate cancer who, with increased level of alkaline phosphatase and normal PSA, showed clinical and radiological evidence of progression of the disease.


Assuntos
Adenocarcinoma/sangue , Neoplasias Ósseas/secundário , Antígeno Prostático Específico/sangue , Neoplasias da Próstata/sangue , Adenocarcinoma/tratamento farmacológico , Adenocarcinoma/patologia , Idoso , Antineoplásicos/uso terapêutico , Neoplasias Ósseas/diagnóstico por imagem , Neoplasias Ósseas/tratamento farmacológico , Humanos , Masculino , Neoplasias da Próstata/tratamento farmacológico , Neoplasias da Próstata/patologia , Cintilografia , Resultado do Tratamento
18.
Epigenetics ; 8(6): 571-83, 2013 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-23770814

RESUMO

Recently, it has been suggested that C2ORF40 is a candidate tumor suppressor gene in breast cancer. However, the mechanism for reduced expression of C2ORF40 and its functional role in breast cancers remain unclear. Here we show that C2ORF40 is frequently silenced in human primary breast cancers and cell lines through promoter hypermethylation. C2ORF40 mRNA level is significantly associated with patient disease-free survival and distant cancer metastasis. Overexpression of C2ORF4 0 inhibits breast cancer cell proliferation, migration and invasion. By contrast, silencing C2ORF40 expression promotes these biological phenotypes. Bioinformatics and FACS analysis reveal C2ORF40 functions at G2/M phase by downregulation of mitotic genes expression, including UBE2C. Our results suggest that C2ORF40 acts as a tumor suppressor gene in breast cancer pathogenesis and progression and is a candidate prognostic marker for this disease.


Assuntos
Neoplasias da Mama/genética , Neoplasias da Mama/patologia , Mitose/genética , Proteínas de Neoplasias/genética , Proteínas de Neoplasias/fisiologia , Neoplasias da Mama/metabolismo , Linhagem Celular Tumoral , Proliferação de Células , Metilação de DNA , Feminino , Regulação Neoplásica da Expressão Gênica , Genes Supressores de Tumor , Genes cdc , Humanos , Invasividade Neoplásica , Prognóstico , Proteínas Supressoras de Tumor
19.
J Clin Oncol ; 31(23): 2854-60, 2013 Aug 10.
Artigo em Inglês | MEDLINE | ID: mdl-23835714

RESUMO

PURPOSE Cisplatin plus fluorouracil (PF) induction chemotherapy has been compared with taxane (docetaxel or paclitaxel), cisplatin, and fluorouracil (Tax-PF) in randomized trials in locoregionally advanced head and neck cancers (LAHNCs). The aim of this meta-analysis was to study the efficacy and toxicity of Tax-PF and PF and identify differences in outcomes in subsets of patients. METHODS Five randomized trials representing 1,772 patients were identified. Updated individual patient data (IPD) were retrieved for all trials. The log-rank test, stratified by trial, was used for comparison. Interaction or trend tests were used to study the interaction between covariates and treatment. Results Median follow-up was 4.9 years. The hazard ratio (HR) of death was 0.79 (95% CI, 0.70 to 0.89; P < .001; absolute benefit at 5 years: 7.4%) in favor of Tax-PF. Heterogeneity was significant (P = .08, I(2) = 51%) and related to one trial. There was no more heterogeneity after exclusion of this trial (P = .99, I(2) = 0%), and HR of death was 0.72 (95% CI, 0.63 to 0.83) in favor of Tax-PF. There was no interaction between treatment effect and the following patient covariates: age, sex, performance status, tumor stage, or site. Tax-PF was associated with significant reductions of progression, locoregional failure, and distant failure compared with PF, with HRs of 0.78 (95% CI, 0.69 to 0.87; P < .001), 0.79 (95% CI, 0.66 to 0.94; P = .007), and 0.63 (95% CI, 0.45 to 0.89; P = .009) respectively. CONCLUSION This IPD meta-analysis shows the superiority of Tax-PF over PF as induction chemotherapy. Its precise role in the management of LAHNC remains to be determined.


Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Neoplasias de Cabeça e Pescoço/tratamento farmacológico , Protocolos de Quimioterapia Combinada Antineoplásica/efeitos adversos , Hidrocarbonetos Aromáticos com Pontes/administração & dosagem , Hidrocarbonetos Aromáticos com Pontes/efeitos adversos , Cisplatino/administração & dosagem , Cisplatino/efeitos adversos , Intervalo Livre de Doença , Fluoruracila/administração & dosagem , Fluoruracila/efeitos adversos , Humanos , Quimioterapia de Indução/métodos , Pessoa de Meia-Idade , Ensaios Clínicos Controlados Aleatórios como Assunto , Taxoides/administração & dosagem , Taxoides/efeitos adversos , Resultado do Tratamento
20.
PLoS One ; 7(11): e49453, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-23166673

RESUMO

FBXW7 acts as a tumor suppressor through ubiquitination and degradation of multiple oncoproteins. Loss of FBXW7 expression, which could be partially attributed by the genomic deletion or mutation of FBXW7 locus, is frequently observed in various human cancers. However, the mechanisms regulating FBXW7 expression still remain poorly understood. Here we examined the 5' region of FBXW7 gene to investigate the regulation of FBXW7 expression. We identified seven alternative splicing (AS) 5'-UTR forms of FBXW7α that are composed of multiple novel non-coding exons. A significant difference in translational efficiency among these 5'-UTRs variants was observed by in vivo Luciferase reporter assay and Western blot. Furthermore, we found that the mRNA level of the AS form with high translational efficiency was specifically reduced in more than 80% of breast cancer cell lines and in more than 50% of human primary cancers from various tissues. In addition, we also identified mutations of FBXW7 in prostate cancers (5.6%), kidney cancers (16.7%), and bladder cancers (18.8%). Our results suggest that in addition to mutation, differential expression of FBXW7α AS forms with different translational properties may serve as a novel mechanism for inactivation of FBXW7 in human cancer.


Assuntos
Processamento Alternativo/genética , Proteínas de Ciclo Celular/genética , Proteínas F-Box/genética , Regulação Neoplásica da Expressão Gênica/genética , Neoplasias/genética , Biossíntese de Proteínas/genética , RNA Mensageiro/metabolismo , Ubiquitina-Proteína Ligases/genética , Análise de Variância , Western Blotting , Biologia Computacional , Análise Mutacional de DNA , Éxons/genética , Proteína 7 com Repetições F-Box-WD , Componentes do Gene , Perfilação da Expressão Gênica , Humanos , Luciferases , RNA Mensageiro/genética , Reação em Cadeia da Polimerase Via Transcriptase Reversa
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