RESUMO
Over the past decade, trastuzumab was the only available monoclonal anti-HER2 antibody for the treatment of HER2 positive breast and gastric cancer. Recently, pertuzumab added to docetaxel and trastuzumab showed dramatic overall survival improvement in first line treatment of HER2 positive metastatic breast cancer. Pertuzumab is the first approved monoclonal antibody in a new class of drugs called dimerization inhibitors. This agent was also approved in association with trastuzumab for neoadjuvant HER2-positive breast cancer treatment. However, pertuzumab development was not confined to breast cancer and in the present review, we will focus on biological rational, preclinical data and clinical trial results of pertuzumab in solid tumors excluding breast cancer.
Assuntos
Anticorpos Monoclonais Humanizados/uso terapêutico , Antineoplásicos/uso terapêutico , Neoplasias/tratamento farmacológico , Receptor ErbB-2/antagonistas & inibidores , Neoplasias da Mama/tratamento farmacológico , Carcinoma Pulmonar de Células não Pequenas/tratamento farmacológico , Neoplasias do Colo/tratamento farmacológico , Feminino , Humanos , Neoplasias Pulmonares/tratamento farmacológico , Masculino , Neoplasias Ovarianas/tratamento farmacológico , Neoplasias da Próstata/tratamento farmacológico , Neoplasias Gástricas/tratamento farmacológicoRESUMO
BACKGROUND: Trastuzumab is a humanized monoclonal antibody used for the treatment of HER2-positive breast cancer. Cardiotoxicity is a well-known adverse event of trastuzumab use but little has been documented regarding its use in patients with a history of cardiac disease. CASE REPORT: We describe a case in which trastuzumab treatment was administered to a 40-year-old female patient with early breast cancer after acute heart failure secondary to postoperative Takotsubo cardiomyopathy. After one year of follow-up with close monitoring by echocardiography, there have been no heart-related symptoms. Additional surgery was performed because of positive resection margins at first surgery, without complications, despite the risk of recurrence of Takotsubo cardiomyopathy. CONCLUSION: Trastuzumab can be safely administered after acute heart failure secondary to postoperative Takotsubo cardiomyopathy.
Assuntos
Anticorpos Monoclonais Humanizados/uso terapêutico , Antineoplásicos/uso terapêutico , Neoplasias da Mama/tratamento farmacológico , Neoplasias da Mama/cirurgia , Cardiomiopatia de Takotsubo/fisiopatologia , Adulto , Feminino , Humanos , Cardiomiopatia de Takotsubo/etiologia , TrastuzumabAssuntos
Adenocarcinoma/diagnóstico por imagem , Adenocarcinoma/secundário , Neoplasias Cerebelares/diagnóstico por imagem , Neoplasias Cerebelares/secundário , Imagem Multimodal , Tomografia por Emissão de Pósitrons , Neoplasias da Próstata/patologia , Tomografia Computadorizada por Raios X , Idoso , Colina/análogos & derivados , Humanos , Masculino , Compostos RadiofarmacêuticosRESUMO
Androgen receptor (AR) signaling pathway remains the foremost target of novel therapeutics for castration-resistant prostate cancer (CRPC). However, the expression of constitutively active AR variants lacking the carboxy-terminal region in CRPC may lead to therapy inefficacy. These AR variants are supposed to support PCa cell growth in an androgen-depleted environment, but their mode of action still remains unresolved. Moreover, recent studies indicate that constitutively active AR variants are expressed in primary prostate tumors and may contribute to tumor progression. The aim of this study was to investigate the impact of constitutively active AR variants on the expression of tumor progression markers. N-cadherin expression was analyzed in LNCaP cells overexpressing the wild type AR or a constitutively active AR variant by qRT-PCR, Western blot and immunofluorescence. We showed here for the first time that N-cadherin expression was increased in the presence of constitutively active AR variants. These results were confirmed in C4-2B cells overexpressing these AR variants. Although N-cadherin expression is often associated with a downregulation of E-cadherin, this phenomenon was not observed in our model. Nevertheless, in addition to the increased expression of N-cadherin, an upregulation of other mesenchymal markers expression such as VIMENTIN, SNAIL and ZEB1 was observed in the presence of constitutively active variants. In conclusion, our findings highlight novel consequences of constitutively active AR variants on the regulation of mesenchymal markers in prostate cancer.
Assuntos
Biomarcadores Tumorais/genética , Variação Genética , Mesoderma/metabolismo , Neoplasias da Próstata/patologia , Receptores Androgênicos/genética , Regulação para Cima , Caderinas/genética , Linhagem Celular Tumoral , Progressão da Doença , Proteínas de Homeodomínio/genética , Humanos , Masculino , Fatores de Transcrição/genética , Vimentina/genética , Homeobox 1 de Ligação a E-box em Dedo de ZincoRESUMO
BACKGROUND: Trastuzumab is used for the adjuvant (postoperative) treatment of (HER2)-positive early breast cancer. The duration of treatment is set at one year. The goal of our study was to examine the effective duration of trastuzumab treatment in routine clinical practice. PATIENTS AND METHODS: We performed a retrospective review of all patients with early breast cancer, treated with trastuzumab at our hospital between 2005 and 2008. Data concerning patterns of use and safety were collected from patient charts and pharmacy records. RESULTS: The cohort comprised of 96 patients, with a median age of 50 years (range=25-79 years). The majority of patients (63.5%) had node-negative disease. Besides trastuzumab, most patients underwent chemotherapy (before or after surgery). Trastuzumab was administered every three weeks and the median duration of treatment was 52 weeks (range=6-81 weeks). Only half of the patients received the monoclonal antibody for 52 weeks, 36.6% had therapy more than 52 weeks and 12.5% discontinued treatment before 52 weeks due to adverse effects (8.4%) and refusal (4.1%). Two (2.1%) patients discontinued trastuzumab therapy because of cardiotoxicity, a recognized side-effect of the monoclonal antibody. Regarding treatment durations of more than 52 weeks, 15/35 were due to the off-label use of trastuzumab in the neoadjuvant setting (before surgery). The 3-year rate of disease-free survival was 91.6%. CONCLUSION: Half of the patients completed the 52-week treatment of trastuzumab after surgery for early breast cancer. Trastuzumab was well-tolerated and the rate of discontinuation due to cardiotoxicity was low, compared to published results.
Assuntos
Anticorpos Monoclonais Humanizados/administração & dosagem , Antineoplásicos/administração & dosagem , Neoplasias da Mama/tratamento farmacológico , Carcinoma/tratamento farmacológico , Adulto , Idoso , Neoplasias da Mama/cirurgia , Carcinoma/cirurgia , Cardiotoxinas/uso terapêutico , Quimioterapia Adjuvante , Intervalo Livre de Doença , Feminino , Humanos , Pessoa de Meia-Idade , Terapia Neoadjuvante , Receptor ErbB-2/análise , Estudos Retrospectivos , TrastuzumabRESUMO
Almost all prostate cancers respond to androgen deprivation treatment but many recur. We postulated that risk of hormone escape--frequency and delay--are influenced by hormone therapy modalities. More, hormone therapies induce crucial biological changes involving androgen receptors; some might be targets for escape prevention. We investigated the relationship between the androgen deprivation treatment and the risk of recurrence using nude mice bearing the high grade, hormone-dependent human prostate cancer xenograft PAC120. Tumor-bearing mice were treated by Luteinizing-Hormone Releasing Hormone (LHRH) antagonist alone, continuous or intermittent regimen, or combined with androgen receptor (AR) antagonists (bicalutamide or flutamide). Tumor growth was monitored. Biological changes were studied as for genomic alterations, AR mutations and protein expression in a large series of recurrent tumors according to hormone therapy modalities. Therapies targeting Her-2 or AKT were tested in combination with castration. All statistical tests were two-sided. Tumor growth was inhibited by continuous administration of the LH-RH antagonist degarelix (castration), but 40% of tumors recurred. Intermittent castration or complete blockade induced by degarelix and antiandrogens combination, inhibited tumor growth but increased the risk of recurrence (RR) as compared to continuous castration (RR(intermittent): 14.5, RR(complete blockade): 6.5 and 1.35). All recurrent tumors displayed new quantitative genetic alterations and AR mutations, whatever the treatment modalities. AR amplification was found after complete blockade. Increased expression of Her-2/neu with frequent ERK/AKT activation was detected in all variants. Combination of castration with a Her-2/neu inhibitor decreased recurrence risk (0.17) and combination with an mTOR inhibitor prevented it. Anti-hormone treatments influence risk of recurrence although tumor growth inhibition was initially similar. Recurrent tumors displayed genetic instability, AR mutations, and alterations of phosphorylation pathways. We postulated that Her-2/AKT pathways allowed salvage of tumor cells under castration and we demonstrated that their inhibition prevented tumor recurrence in our model.
Assuntos
Androgênios/uso terapêutico , Neoplasias da Próstata/tratamento farmacológico , Neoplasias da Próstata/enzimologia , Inibidores de Proteínas Quinases/farmacologia , Inibidores de Proteínas Quinases/uso terapêutico , Proteínas Tirosina Quinases/antagonistas & inibidores , Ensaios Antitumorais Modelo de Xenoenxerto , Androgênios/deficiência , Animais , Sequência de Bases , Castração , Análise por Conglomerados , Terapia Combinada , Intervalo Livre de Doença , Dosagem de Genes/genética , Humanos , Masculino , Camundongos , Mutação/genética , Neoplasias da Próstata/genética , Neoplasias da Próstata/patologia , Proteínas Tirosina Quinases/metabolismo , Receptor ErbB-2/genética , Receptores Androgênicos/genéticaRESUMO
AIMS: A minority of patients with advanced sarcoma achieve prolonged progression free survival (PFS) with insulin growth factor type 1 receptor (IGF-1R) monoclonal antibody (Ab) therapy. A biomarker identifying those patients beforehand would be useful to select patients for the development of these agents. METHODS: This single centre series includes patients with unresectable or metastatic soft tissue sarcomas (STS), Ewing sarcoma (ES) and osteosarcoma treated with IGF-1R Ab (R1507, IMC-A12, SCH 717454 and CP-751.871) in the Centre Léon Bérard. Tumour samples were analysed by immunohistochemistry for expression of IGF-1R, insulin-like growth factor binding protein type 3 (IGFBP-3), Ki67, epidermal growth factor receptor (HER1) and human epidermal growth factor receptor 2 (HER2). Predictive factors for PFS and overall survival (OS) were investigated. RESULTS: All tumour samples had a positive IGF-1R immunostaining on 60% to 100% of tumour cells. IGFBP-3 immunostaining was observed in 12 (75%) samples with 5% to 100% of positive cells. IGF-1R immunostaining was nuclear (n=9, 56%), cytoplasmic (n=4, 25%), or nuclear +cytoplasmic (n=3, 19%). Neither IGFBP-3 expression, nor Ki67 was correlated to PFS. HER2 and HER1 staining were positive in 0 and 2 samples respectively (both primary resistant to IGF-1R Ab therapy). Exclusive intra-nuclear immunoreactivity for IGF-1R was significantly associated with a better PFS (p=0.01) and OS (p=0.007). CONCLUSION: Exclusive nuclear localisation of IGF-1R is an easily testable biomarker associated with a better PFS and OS for patients treated with IGF-1R Ab therapy. Nuclear localisation of IGF-1R in tumour cells might be a hallmark of pathway activation.
Assuntos
Anticorpos Monoclonais/uso terapêutico , Antineoplásicos/uso terapêutico , Biomarcadores Tumorais/antagonistas & inibidores , Biomarcadores Tumorais/metabolismo , Núcleo Celular/metabolismo , Imuno-Histoquímica , Receptor IGF Tipo 1/antagonistas & inibidores , Receptor IGF Tipo 1/metabolismo , Sarcoma/tratamento farmacológico , Sarcoma/metabolismo , Adolescente , Adulto , Idoso , Biomarcadores Tumorais/imunologia , Biópsia , Neoplasias Ósseas/tratamento farmacológico , Neoplasias Ósseas/metabolismo , Linhagem Celular Tumoral , Criança , Intervalo Livre de Doença , Receptores ErbB/metabolismo , Feminino , França , Humanos , Proteína 3 de Ligação a Fator de Crescimento Semelhante à Insulina/metabolismo , Estimativa de Kaplan-Meier , Antígeno Ki-67/metabolismo , Masculino , Pessoa de Meia-Idade , Osteossarcoma/tratamento farmacológico , Osteossarcoma/metabolismo , Seleção de Pacientes , Valor Preditivo dos Testes , Receptor ErbB-2/metabolismo , Receptor IGF Tipo 1/imunologia , Sarcoma/imunologia , Sarcoma/mortalidade , Sarcoma de Ewing/tratamento farmacológico , Sarcoma de Ewing/metabolismo , Fatores de Tempo , Resultado do Tratamento , Adulto JovemRESUMO
OBJECTIVES. As vascular endothelial growth factor (VEGF) is expressed in ovarian cancer, we assessed the efficacy and safety of bevacizumab (a monoclonal antibody targeting VEGF) plus microtubule targeting agents for heavily pre-treated ovarian carcinoma patients. METHODS. We retrospectively reviewed 43 patients with recurrent epithelial ovarian carcinoma. Combined treatment included bevacizumab with paclitaxel in 32 (74%), docetaxel in 10 (23%), and vinorelbine in one (2.3%) patients, respectively. RESULTS. The median number of combined treatment was six cycles (range 1-29). On RECIST criteria, the objective response rate (ORR) was 40% (16% CR and 24% PR). Clinical benefit (complete response [CR] plus partial response [PR] and stable disease [SD] lasting ≥ 3 months) was 74% (CI95%: 46.7-77%). Median duration of treatment and overall survival were 3.9 months (range 0.2-14.4 months) and 20.1 months (CI95%: 13.8-20.1) respectively. No toxic death was reported. Grade 3-4 toxicity occurred in 30% of patients. Gastrointestinal perforations and fistula occurred in 3 (7%) and 6 (14%) patients, respectively. CONCLUSION. Although being active in terms of ORR, bevacizumab plus microtubule targeting agents - mainly taxanes - leads to a high rate of gastro-intestinal perforations and fistula in heavily pre-treated ovarian carcinoma patients.
Assuntos
Inibidores da Angiogênese/uso terapêutico , Anticorpos Monoclonais/uso terapêutico , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Neoplasias Epiteliais e Glandulares/tratamento farmacológico , Neoplasias Ovarianas/tratamento farmacológico , Fator A de Crescimento do Endotélio Vascular/antagonistas & inibidores , Adulto , Idoso , Inibidores da Angiogênese/efeitos adversos , Anticorpos Monoclonais/efeitos adversos , Anticorpos Monoclonais Humanizados , Protocolos de Quimioterapia Combinada Antineoplásica/efeitos adversos , Bevacizumab , Carboplatina/administração & dosagem , Carboplatina/efeitos adversos , Carcinoma Epitelial do Ovário , Ciclofosfamida/administração & dosagem , Ciclofosfamida/efeitos adversos , Docetaxel , Esquema de Medicação , Feminino , Humanos , Fístula Intestinal/induzido quimicamente , Perfuração Intestinal/induzido quimicamente , Pessoa de Meia-Idade , Neoplasias Epiteliais e Glandulares/irrigação sanguínea , Neoplasias Epiteliais e Glandulares/mortalidade , Neoplasias Ovarianas/irrigação sanguínea , Neoplasias Ovarianas/mortalidade , Paclitaxel/administração & dosagem , Paclitaxel/efeitos adversos , Fístula Retovaginal/induzido quimicamente , Estudos Retrospectivos , Taxoides/administração & dosagem , Taxoides/efeitos adversos , Resultado do Tratamento , Fístula da Bexiga Urinária/induzido quimicamente , Vimblastina/administração & dosagem , Vimblastina/efeitos adversos , Vimblastina/análogos & derivados , VinorelbinaRESUMO
BACKGROUND: Oxaliplatin is an anticancer agent only approved for treatment of colorectal cancer, but that has shown some activity in metastatic breast cancer in phase II studies. Herein, we examine the off-label use of oxaliplatin in unselected patients with metastatic breast cancer. PATIENTS AND METHODS: A retrospective review was performed of all patients with metastatic breast cancer treated with oxaliplatin at our hospital between February 2003 and November 2009. Data concerning patterns of use, safety and activity were collected from patient charts. RESULTS: The cohort comprised 30 female patients with a median age of 49 (range, 34-68 years) and a median of two involved organs (range, 1-4). All patients had been pretreated for metastatic breast cancer (median number of previous lines: 3; range:1-6). Oxaliplatin was only given in association either with fluorouracil and folinic acid (n=23) or with gemcitabine (n=7). The most commonly used dose was 100 mg/m(2) given every other week or every 3 weeks. As of December 15, 2009, the median duration of treatment was 4 (range, 0.75-11) months. Most of the discontinuations occured due to disease progression (n=11) and adverse effects or worsening condition (n=8). Twelve (40%) patients presented side-effects related to oxaliplatin use including hematotoxicity (n=8), gastrointestinal disorders (n=4) and neuropathies (n=2). Among patients evaluable for antitumoral activity (n=15), one patient achieved a complete response and one patient demonstrated a partial response. Most of the patients (57%) continued to be treated by chemotherapy after oxaliplatin. Median overall survival for the evaluable patients was 10 (range, 1-51) months. CONCLUSION: In our population of heavily pretreated women with metastatic breast cancer, off-label use of oxaliplatin was of little worth. This off-label treatment was not the last therapeutic option for most of these patients.
Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Neoplasias da Mama/tratamento farmacológico , Carcinoma Ductal de Mama/tratamento farmacológico , Carcinoma Lobular/tratamento farmacológico , Uso Off-Label , Adulto , Idoso , Neoplasias Ósseas/tratamento farmacológico , Neoplasias Ósseas/secundário , Neoplasias Encefálicas/tratamento farmacológico , Neoplasias Encefálicas/secundário , Neoplasias da Mama/patologia , Carcinoma Ductal de Mama/patologia , Carcinoma Lobular/patologia , Estudos de Coortes , Desoxicitidina/administração & dosagem , Desoxicitidina/análogos & derivados , Feminino , Fluoruracila/administração & dosagem , Humanos , Leucovorina/administração & dosagem , Neoplasias Pulmonares/tratamento farmacológico , Neoplasias Pulmonares/secundário , Metástase Linfática , Pessoa de Meia-Idade , Estadiamento de Neoplasias , Compostos Organoplatínicos/administração & dosagem , Oxaliplatina , Estudos Retrospectivos , Neoplasias Cutâneas/tratamento farmacológico , Neoplasias Cutâneas/secundário , Taxa de Sobrevida , Resultado do Tratamento , GencitabinaRESUMO
Although advanced prostate cancer patients respond very well to front-line androgen deprivation, failure to hormonal therapy most often occurs after a median time of 18-24 months. The care of castration-resistant prostate cancer (CRPC) has significantly evolved over the past decade, with the onset of first-line therapy with docetaxel. Although numerous therapy schedules have been investigated alongside docetaxel, in either first-line or salvage therapy, results were dismal. However, CRPC chemotherapy is currently evolving, with, on the one hand, new agents targeting androgen metabolism and, on the other hand, significant progress in chemotherapy drugs, particularly for second-line therapy. The aim of the present review is to describe the current treatments for CRPC chemotherapy alongside their challengers that might shortly become new standards. In this article, we discuss the most recent data from clinical trials to provide the reader with a comprehensive, state-of-the-art overview of CRPC chemotherapy and hormonal therapy.
Assuntos
Antineoplásicos/uso terapêutico , Terapia de Alvo Molecular , Neoplasias Hormônio-Dependentes/tratamento farmacológico , Neoplasias da Próstata/tratamento farmacológico , Taxoides/uso terapêutico , Docetaxel , Humanos , Masculino , Neoplasias Hormônio-Dependentes/metabolismo , Orquiectomia , Neoplasias da Próstata/metabolismo , Receptores Androgênicos/metabolismo , Esteroide 17-alfa-Hidroxilase/antagonistas & inibidoresRESUMO
The aim of our work was to assess the potential clinical impact of therapeutic education in patients treated with anticancer drugs. One hundred-one ambulatory adult patients (mean age: 60 years, range: 24-88) treated by anticancer chemotherapy were included. The occurrence of adverse events was reported by 83% of the patients. Twenty-one percent (14/67) of the patients were not compliant with their supportive care treatment, 60% (60/101) took over-the-counter medications (one contraindication identified) and 14% (14/101) claimed they had received no counsel on risk behaviour (UV exposure, lack of contraception, driving) from health care professionals. Overall, 11% (44/397) of adverse events were associated with a lack of information. Twelve percent (4/33) of the calls to the doctor, 6% (1/17) of the visits to the physician and 21% (3/14) of the hospitalizations could be associated with a lack of therapeutic education. These data enlighten the importance of therapeutic education of cancer patients treated by chemotherapy.
Assuntos
Antineoplásicos/efeitos adversos , Neoplasias/tratamento farmacológico , Cooperação do Paciente , Educação de Pacientes como Assunto , Adulto , Idoso , Idoso de 80 Anos ou mais , Antineoplásicos/uso terapêutico , Contraindicações , Feminino , Inquéritos Epidemiológicos , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Assunção de Riscos , Automedicação , Adulto JovemRESUMO
Background. Localized granulocytic sarcoma of the uterine cervix in the absence of acute myelogenous leukemia (AML) at presentation is very rare, its diagnosis is often delayed, and its prognosis almost always ominous evolving into refractory AML. Case. We present the case of a 30-year-old woman with vaginal bleeding and a large cervical mass. Further evaluation confirmed the presence of a granulocytic sarcoma but failed to reveal systemic involvement. Results. AML type chemotherapy followed by radiotherapy of the uterus led to a durable complete remission. She remains in complete remission six years after diagnosis. Conclusion. Granulocytic sarcoma of the cervix is a rare entity for which early intensive AML type therapy is effective.
RESUMO
BACKGROUND: Delayed elimination of methotrexate associated with serious side-effects has been attributed to the co-administration of benzimidazole proton pump inhibitors. PATIENTS AND METHODS: We have retrospectively analyzed the causes of delayed methotrexate elimination in patients who had received the rescue agent glucarpidase to evaluate the potential implication of benzimidazoles. RESULTS: Between 2002 and 2008, six patients (mean age: 30 years; range: 4-74 years) were treated with glucarpidase. Delayed elimination associated with impaired renal function occured after the first cycle except in 2 patients (2nd and 8th administration of high-dose methotrexate). The possible causes of delayed elimination identified were: insufficient hydration (n=1) and drug-drug interactions (n=5). The potential drug-drug interactions included the co-administration of piperacillin/tazobactam (n=1) and proton pump inhibitors (omeprazole, n=3; esomeprazole, n=2). Impaired elimination of methotrexate was not observed either in the 3 patients who were treated further or during the previous cycles of the 2 pretreated patients in relation to the absence of co-prescription of proton pump inhibitors. CONCLUSION: In line with the recent literature and given the prohibitive cost of glucarpidase, we have advocated the cessation of proton pump inhibitors administration during methotrexate treatment.
Assuntos
Antimetabólitos Antineoplásicos/farmacocinética , Antimetabólitos Antineoplásicos/intoxicação , Protocolos de Quimioterapia Combinada Antineoplásica/farmacocinética , Benzimidazóis/farmacologia , Metotrexato/farmacocinética , Metotrexato/intoxicação , Inibidores da Bomba de Prótons/farmacologia , Adolescente , Adulto , Idoso , Antimetabólitos Antineoplásicos/administração & dosagem , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Benzimidazóis/administração & dosagem , Neoplasias Ósseas/tratamento farmacológico , Neoplasias Ósseas/metabolismo , Criança , Pré-Escolar , Interações Medicamentosas , Humanos , Linfoma/tratamento farmacológico , Linfoma/metabolismo , Metotrexato/administração & dosagem , Pessoa de Meia-Idade , Neuroblastoma/tratamento farmacológico , Neuroblastoma/metabolismo , Osteossarcoma/tratamento farmacológico , Osteossarcoma/metabolismo , Inibidores da Bomba de Prótons/administração & dosagem , Estudos Retrospectivos , Adulto Jovem , gama-Glutamil Hidrolase/uso terapêuticoRESUMO
Aggressive fibromatosis (AF) or desmoid tumor is a rare condition, characterized by deep tissue invasion by a monoclonal fibroblastic neoplasm, developed from musculoaponeurotic structures. Surgery is the treatment of choice, but negative margins can hardly been achieved in large tumors, and can lead to major functional disability. AF medical therapy includes nonsteroids anti-inflammatory drugs, tamoxifen, with inconsistent results. Several reports of imatinib efficacy in AF appear in the literature. Here, we describe for the first time a V530I KIT exon 10 mutant that was associated to a dramatic imatinib response in an extraabdominal aggressive fibromatosis. The previously discovered V530I substitution was characterized in the core binding factor AML, but had never been reported in any other condition, so far. In this paper, we discuss the KIT exon 10 mutations or polymorphisms that have been described in a variety of KIT-related conditions, including acute myelogenous leukemia, mastocytosis, and aggressive fibromatosis.
RESUMO
Castration resistance in prostate cancer (PCa) constitutes an advanced, aggressive disease with poor prognosis, associated with uncontrolled cell proliferation, resistance to apoptosis, and enhanced invasive potential. The molecular mechanisms involved in the transition of PCa to castration resistance are obscure. Here, we report that the nonselective cationic channel transient receptor potential vanilloid 2 (TRPV2) is a distinctive feature of castration-resistant PCa. TRPV2 transcript levels were higher in patients with metastatic cancer (stage M1) compared with primary solid tumors (stages T2a and T2b). Previous studies of the TRPV2 channel indicated that it is primarily involved in cancer cell migration and not in cell growth. Introducing TRPV2 into androgen-dependent LNCaP cells enhanced cell migration along with expression of invasion markers matrix metalloproteinase (MMP) 9 and cathepsin B. Consistent with the likelihood that TRPV2 may affect cancer cell aggressiveness by influencing basal intracellular calcium levels, small interfering RNA-mediated silencing of TRPV2 reduced the growth and invasive properties of PC3 prostate tumors established in nude mice xenografts, and diminished expression of invasive enzymes MMP2, MMP9, and cathepsin B. Our findings establish a role for TRPV2 in PCa progression to the aggressive castration-resistant stage, prompting evaluation of TRPV2 as a potential prognostic marker and therapeutic target in the setting of advanced PCa.
Assuntos
Neoplasias da Próstata/genética , Interferência de RNA , Canais de Cátion TRPV/genética , Androgênios/metabolismo , Androgênios/farmacologia , Animais , Western Blotting , Linhagem Celular Tumoral , Movimento Celular , Progressão da Doença , Resistencia a Medicamentos Antineoplásicos , Regulação Neoplásica da Expressão Gênica , Proteínas de Fluorescência Verde/genética , Proteínas de Fluorescência Verde/metabolismo , Humanos , Masculino , Camundongos , Camundongos Nus , Microscopia Confocal , Invasividade Neoplásica , Metástase Neoplásica , Orquiectomia , Neoplasias da Próstata/patologia , Neoplasias da Próstata/terapia , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Canais de Cátion TRPV/metabolismo , Canais de Cátion TRPV/fisiologia , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
BACKGROUND: A number of studies have shown that elderly cancer patients were denied optimal anticancer treatment because of age. Colorectal cancer is among the most frequent cancers in Western countries, and adjuvant chemotherapy has proven efficacy and tolerance in this condition. This study was undertaken to explore the current approaches to adjuvant chemotherapy in elderly cancer patients in a single institution. PATIENTS AND METHODS: We retrospectively analyzed all patients' files that were discussed in the gastro-intestinal tumor board of the Hôpitaux Universitaires de Strasbourg during 3 years (2004-2006). The recorded variables included sex, age, tumor stage, cancer location colon vs rectum, number of comorbidities, occurrence of an oncogeriatric assessment, type and tolerance of chemotherapy. We investigated the reason to not administer adjuvant therapy in patients whom should have received this treatment if guidelines had to be applied. RESULTS: A total of 193 consecutive patients' files were extracted from colorectal cancer patients that had been discussed in the gastro-intestinal tumor board. Among these, we isolated patients over 70 years old who were proposed with either adjuvant chemotherapy (group A, n=65) or follow up (group B, n=128). The median age in group A was 75.3 years old. Tumor board recommendations were in accordance with guidelines in 91% of cases. Chemotherapy was delivered in 44 pts (76%) and completed in 42 (95%). The median age in group B was 78.6 years old, and in this group tumor board proposal met the guidelines in 83% of cases. In the logistic regression model, disease stage was the major variable leading to adjuvant treatment recommendation, age and comorbidities being of lesser importance. CONCLUSIONS: In our series, elderly colorectal cancer patients are not undertreated. Efforts should be maintained to educate physicians with regard to feasibility of adjuvant chemotherapy in elderly patients.
Assuntos
Antineoplásicos/uso terapêutico , Neoplasias Colorretais/tratamento farmacológico , Idoso , Quimioterapia Adjuvante , Neoplasias Colorretais/radioterapia , Terapia Combinada , Humanos , Estudos RetrospectivosRESUMO
Advanced prostate cancer (PCa) has emerged as a public health concern due to population aging. Although androgen deprivation has proven efficacy in this condition, most advanced PCa patients will have to face failure of androgen deprivation as a treatment. Mutations in the androgen receptor (AR) from tumor cells have been shown to induce androgen independency both in PCa cell lines and in the clinic. We have investigated the molecular events leading to androgen independency in the 22Rv1 cell line, a commonly used preclinical model of PCa. Besides AR mutants that have been described so far, including nonsense mutations, recent data have focused on AR pre-mRNA aberrant splicing as a new mechanism leading to constitutively active truncated AR variants. In this article, we describe two novel variants arising from aberrant splicing of AR pre-mRNA, characterized by long mRNA transcripts that encode truncated, constitutively active proteins. We also describe several new nonsense mutants that share ligand independency and transcriptional activity. Finally, we show that alongside these mutants, 22Rv1 cells also express a mutant AR lacking exon 3 tandem duplication, a major feature of this cell line. By describing unreported AR mutants in the 22Rv1 cell line, our data emphasize the complexity and heterogeneity of molecular events that occur in preclinical models, and supposedly in the clinic. Future work on the 22Rv1 cell line should take into account the concomitant expression of various AR mutants.
Assuntos
Processamento Alternativo , Mutação , Neoplasias Hormônio-Dependentes/genética , Neoplasias da Próstata/genética , Precursores de RNA , Receptores Androgênicos/genética , Androgênios/metabolismo , Linhagem Celular Tumoral , Éxons , Regulação Neoplásica da Expressão Gênica , Variação Genética , Humanos , Masculino , Precursores de RNA/genética , Precursores de RNA/metabolismo , Receptores Androgênicos/metabolismoRESUMO
PURPOSE: To describe the patterns of care of elderly cancer patients (ECPs) (>70 years old) and the factors affecting the referral by general practitioners (GPs) of patients to cancer specialists (SPs), in Alsace France. METHODS: A postal mail questionnaire was sent to a total of 2818 physicians including primary care physicians and specialists. The factors possibly responsible for a poor referral rate of ECPs and the factors affecting treatment implementation by specialists were explored. We also searched for unmet needs such as the incorporation of geriatric assessment into routine practice and continuous medical education (CME) programs. RESULTS: A total of 1217 questionnaires were returned (46.9%) from 1053 GPs and 214 SPs. Patients' age did not negatively impact referral to SPs as opposed to patients' performance status, wishes, and co-morbidities. Conversely, a significant decrease in patients' file presentation by SPs to tumor boards was observed for patients over 80 years old. Neither reimbursement nor SPs' waiting lists were an issue. The need for CME programs in geriatric oncology was emphasized by both GPs and SPs. CONCLUSIONS: Age was not the governing variable that impacted patient referral. The need for CME in geriatrics was highlighted for both GPs and SPs.
Assuntos
Atitude do Pessoal de Saúde , Necessidades e Demandas de Serviços de Saúde , Medicina , Neoplasias , Médicos de Família , Idoso , Feminino , Humanos , Masculino , Inquéritos e QuestionáriosRESUMO
AIM: The extent of potential pharmacokinetic drug-drug interactions affecting anticancer agents disposition has not been specifically investigated. The prevalence of this type of interaction in adult ambulatory patients receiving systemic chemotherapy in our institution was examined. PATIENTS AND METHODS: The medication list of 200 consecutive cancer patients receiving intravenous chemotherapy was prospectively collected by means of the prescriptions (chemotherapy, supportive care, medications for comorbidities) and a questionnaire (over-the-counter products). Interacting drugs had to have been taken in the previous 7 days. Data concerning the type of cancer and the nature of the comorbidities were also collected. Potential pharmacokinetic drug interactions affecting the activity of the anticancer agent were identified using the guide of drug interactions of the French drug agency (June 2007) and the literature. RESULTS: A total of 200 patients (mean age 60 years; range 17-96 years) entered the study and 73.5% were female. The most common cancer types were breast cancer (41%), non-Hodgkin's lymphomas (17.5%), and gastrointestinal tumors (12.5%). The majority of the patients (58.5%) had a comorbid illness (cardiovascular diseases, hypothyroidism, diabetes, depression). The median number of medications per patient was 4 (range 1-14). All the patients received systemic chemotherapy but 29 (14.5%) also took anticancer drugs at home. Nine potential pharmacokinetic interactions were found in nine patients (frequency: 4.5%; 95% confidence interval: 1.6-7.4%). Most of the interactions (7/9) involved fluconazole that might alter the metabolism of oxazaphosphorines or the elimination of bortezomib and paclitaxel. One association was contraindicated. Five interactions were not associated with a published clinical effect. No interaction with an enzyme or drug transporter inducer (e.g., rifampin, St. John's wort) was encountered. CONCLUSION: The frequence of potential pharmacokinetic interactions affecting the disposition of antitumor drugs was low in this population of ambulatory adult cancer patients and mostly involved the antifungal agent fluconazole.
Assuntos
Antineoplásicos/farmacocinética , Neoplasias/tratamento farmacológico , Neoplasias/metabolismo , Adulto , Idoso , Idoso de 80 Anos ou mais , Antineoplásicos/administração & dosagem , Doenças Cardiovasculares/tratamento farmacológico , Doenças Cardiovasculares/metabolismo , Comorbidade , Inibidores das Enzimas do Citocromo P-450 , Sistema Enzimático do Citocromo P-450/metabolismo , Interações Medicamentosas , Inibidores Enzimáticos/farmacologia , Feminino , Fluconazol/farmacologia , Humanos , Hipotireoidismo/tratamento farmacológico , Hipotireoidismo/metabolismo , Masculino , Pessoa de Meia-Idade , Adulto JovemRESUMO
CASE DESCRIPTION: A French Caucasian man aged 39 with HIV infection was treated with abacavir/lamivudine and ritonavir/lopinavir. The patient (normal renal and liver functions) was diagnosed with a Burkitt lymphoma for which he was treated with cyclophosphamide day 1 to 5; doxorubicin day 1; methotrexate day 10; and vincristine day 1 and 8. At day 12, he suffered from abdominal pain associated with constipation. Paralytic ileus was diagnosed by study imaging. Ileus lasted 10 days necessitating parenteral feeding. Later on, a further cycle of chemotherapy with etoposide replacing vincristine was given and was well tolerated. CONCLUSION: We speculate that an interaction between ritonavir/lopinavir and vincristine was responsible for this severe toxicity. Vincristine is transported by P-gp and is metabolized via CYP3A5. Ritonavir is a potent CYP3A5 isoenzyme and P-gp inhibitor. Lopinavir is also a P-gp inhibitor. Ritonavir and lopinavir might have delayed vincristine elimination. Clinicians should be aware of this possible interaction.