RESUMEN
Gastric carcinoma with lymphoid stroma is an uncommon variant enriched for mutually exclusive Epstein-Barr virus (EBV) positivity and mismatch repair (MMR) deficiency. We performed this study to evaluate molecular alterations in this morphologically homogeneous subtype and compare them with 295 conventional gastric cancers analyzed in The Cancer Genome Atlas study. We identified 31 study cases and subjected them to in situ hybridization for EBV-encoded RNAs and assessment for MMR status. Immunostains for PD-L1, ß-catenin, and HER2 were performed; extracted DNA was sequenced with a Comprehensive Cancer Panel. Most study patients were older adult men with stage I or II disease (76%). Tumors were classified as EBV/MMR-proficient (MMR-P) (n=7), EBV/MMR deficient (n=12), and EBV/MMR-P (n=12). EBV/MMR-P tumors were usually located in the proximal stomach (83%) and showed heterogenous growth patterns with glandular differentiation (83%). Tumors in all groups showed numerous tumor infiltrating lymphocytes and PD-L1 expression, infrequent nuclear ß-catenin accumulation (10%), and lacked both membranous HER2 staining and HER2 amplification. EBV/MMR-deficient tumors showed significantly higher tumor mutation burden (P=0.001) and KRAS alterations (56%) compared with EBV/MMR-P tumors (9%, P=0.05). TP53 variants were more common among EBV/MMR-P tumors (82%) compared with EBV/MMR proficient (0%, P=0.01) and EBV/MMR-deficient (11%, P<0.01) tumors. Alterations in KRAS, ARID1A, PIK3CA, and TP53 followed similar patterns of distribution compared with The Cancer Genome Atlas dataset. We conclude that gastric carcinomas with lymphoid stroma show a spectrum of molecular changes and frequent PD-L1 expression, raising the possibility that this subgroup of tumors may be susceptible to checkpoint inhibitors and/or agents that target receptor tyrosine kinase-mediated signaling.
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Biomarcadores de Tumor , Carcinoma/diagnóstico , Linfocitos Infiltrantes de Tumor , Neoplasias Gástricas/diagnóstico , Células del Estroma , Adulto , Anciano , Anciano de 80 o más Años , Biomarcadores de Tumor/análisis , Biomarcadores de Tumor/genética , Biopsia , Carcinoma/química , Carcinoma/genética , Carcinoma/patología , Reparación de la Incompatibilidad de ADN , Femenino , Predisposición Genética a la Enfermedad , Herpesvirus Humano 4/genética , Secuenciación de Nucleótidos de Alto Rendimiento , Humanos , Inmunohistoquímica , Hibridación in Situ , Linfocitos Infiltrantes de Tumor/química , Linfocitos Infiltrantes de Tumor/patología , Masculino , Inestabilidad de Microsatélites , Persona de Mediana Edad , Mutación , Fenotipo , ARN Viral/genética , Estudios Retrospectivos , Neoplasias Gástricas/química , Neoplasias Gástricas/genética , Neoplasias Gástricas/patología , Células del Estroma/química , Células del Estroma/patologíaRESUMEN
IMPORTANCE: Mismatch repair (MMR) deficiency (MMRD) and microsatellite instability (MSI) are prognostic for survival in many cancers and for resistance to fluoropyrimidines in early colon cancer. However, the effect of MMRD and MSI in curatively resected gastric cancer treated with perioperative chemotherapy is unknown. OBJECTIVE: To examine the association among MMRD, MSI, and survival in patients with resectable gastroesophageal cancer randomized to surgery alone or perioperative epirubicin, cisplatin, and fluorouracil chemotherapy in the Medical Research Council Adjuvant Gastric Infusional Chemotherapy (MAGIC) trial. DESIGN, SETTING, AND PARTICIPANTS: This secondary post hoc analysis of the MAGIC trial included participants who were treated with surgery alone or perioperative chemotherapy plus surgery for operable gastroesophageal cancer from July 1, 1994, through April 30, 2002. Tumor sections were assessed for expression of the MMR proteins mutL homologue 1, mutS homologue 2, mutS homologue 6, and PMS1 homologue 2. The association among MSI, MMRD, and survival was assessed. MAIN OUTCOMES AND MEASURES: Interaction between MMRD and MSI status and overall survival (OS). RESULTS: Of the 503 study participants, MSI results were available for 303 patients (283 with microsatellite stability or low MSI [median age, 62 years; 219 males (77.4%)] and 20 with high MSI [median age, 66 years; 14 males (70.0%)]). A total of 254 patients had MSI and MMR results available. Patients treated with surgery alone who had high MSI or MMRD had a median OS that was not reached (95% CI, 11.5 months to not reached) compared with a median OS among those who had neither high MSI nor MMRD of 20.5 months (95% CI, 16.7-27.8 months; hazard ratio, 0.42; 95% CI, 0.15-1.15; P = .09). In contrast, patients treated with chemotherapy plus surgery who had either high MSI or MMRD had a median OS of 9.6 months (95% CI, 0.1-22.5 months) compared with a median OS among those who were neither high MSI nor MMRD of 19.5 months (95% CI, 15.4-35.2 months; hazard ratio, 2.18; 95% CI, 1.08-4.42; P = .03). CONCLUSIONS AND RELEVANCE: In the MAGIC trial, MMRD and high MSI were associated with a positive prognostic effect in patients treated with surgery alone and a differentially negative prognostic effect in patients treated with chemotherapy. If independently validated, MSI or MMRD determined by preoperative biopsies could be used to select patients for perioperative chemotherapy.
Asunto(s)
Reparación de la Incompatibilidad de ADN , Inestabilidad de Microsatélites , Neoplasias Gástricas/química , Neoplasias Gástricas/genética , Adulto , Anciano , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Quimioterapia Adyuvante , Cisplatino/administración & dosificación , Proteínas de Unión al ADN/análisis , Epirrubicina/administración & dosificación , Femenino , Fluorouracilo/administración & dosificación , Gastrectomía , Humanos , Masculino , Persona de Mediana Edad , Endonucleasa PMS2 de Reparación del Emparejamiento Incorrecto/análisis , Homólogo 1 de la Proteína MutL/análisis , Proteína 2 Homóloga a MutS/análisis , Pronóstico , Neoplasias Gástricas/terapia , Tasa de SupervivenciaRESUMEN
The aim of this study was to apply Raman spectroscopy in the high wavenumber (HW) region (2800 to 3000??cm?1) for ex vivo detection of gastric cancer and compare its diagnostic potential with that of the fingerprint (FP) region (800 to 1800??cm?1). Raman spectra were collected in the FP and HW regions to differentiate between normal mucosa (n=38) and gastric cancer (n=37). The distinctive Raman spectral differences between normal and cancer tissues are observed at 853, 879, 1157, 1319, 1338, 1448, and 2932??cm?1 and are primarily related to proteins, lipids, nucleic acids, collagen, and carotenoids in the tissue. In FP and HW Raman spectroscopy for diagnosis of gastric cancer, multivariate diagnostic algorithms based on partial-least-squares discriminant analysis, together with leave-one-sample-out cross validation, yielded diagnostic sensitivities of 94.59% and 81.08%, and specificities of 86.84% and 71.05%, respectively. Receiver operating characteristic analysis further confirmed that the FP region model performance is superior to that of the HW region model. Better differentiation between normal and gastric cancer tissues can be achieved using FP Raman spectroscopy and PLS-DA techniques, but the complementary natures of the FP and HW regions make both of them useful in diagnosis of gastric cancer.
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Imagen Molecular/métodos , Procesamiento de Señales Asistido por Computador , Espectrometría Raman/métodos , Neoplasias Gástricas , Adulto , Anciano , Algoritmos , Femenino , Humanos , Masculino , Persona de Mediana Edad , Neoplasias Gástricas/química , Neoplasias Gástricas/diagnósticoRESUMEN
In this study, we investigated the anticancer mechanism of akebia saponin PA (AS), a natural product isolated from Dipsacus asperoides in human gastric cancer cell lines. It was shown that AS-induced cell death is caused by autophagy and apoptosis in AGS cells. The apoptosis-inducing effect of AS was characterized by annexin V/propidium (PI) staining, increase of sub-G1 phase and caspase-3 activation, while the autophagy-inducing effect was indicated by the formation of cytoplasmic vacuoles and microtubule-associated protein 1 light chain-3 II (LC3-II) conversion. The autophagy inhibitor bafilomycin A1 (BaF1) decreased AS-induced cell death and caspase-3 activation, but caspase-3 inhibitor Ac-DEVD-CHO did not affect LC3-II accumulation or AS-induced cell viability, suggesting that AS induces autophagic cell death and autophagy contributes to caspase-3-dependent apoptosis. Furthermore, AS activated p38/c-Jun N-terminal kinase (JNK), which could be inhibited by BaF1, and caspase-3 activation was attenuated by both SB202190 and SP600125, indicating that AS-induced autophagy promotes mitogen-activated protein kinases (MAPKs)-mediated apoptosis. Taken together, these results demonstrate that AS induces autophagic and apoptotic cell death and autophagy plays the main role in akebia saponin PA-induced cell death.
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Antineoplásicos Fitogénicos/farmacología , Apoptosis/efectos de los fármacos , Autofagia/efectos de los fármacos , Saponinas/farmacología , Neoplasias Gástricas/tratamiento farmacológico , Antineoplásicos Fitogénicos/antagonistas & inhibidores , Antineoplásicos Fitogénicos/química , Antineoplásicos Fitogénicos/aislamiento & purificación , Biomarcadores/metabolismo , Caspasa 3/química , Caspasa 3/metabolismo , Línea Celular Tumoral , Supervivencia Celular/efectos de los fármacos , Dipsacaceae/química , Etnofarmacología , Fase G1/efectos de los fármacos , Humanos , Sistema de Señalización de MAP Quinasas/efectos de los fármacos , Medicina Tradicional Coreana , Estructura Molecular , Proteínas de Neoplasias/agonistas , Proteínas de Neoplasias/antagonistas & inhibidores , Proteínas de Neoplasias/metabolismo , Raíces de Plantas/química , Inhibidores de Proteínas Quinasas/farmacología , República de Corea , Saponinas/antagonistas & inhibidores , Saponinas/química , Saponinas/aislamiento & purificación , Neoplasias Gástricas/química , Neoplasias Gástricas/metabolismo , Neoplasias Gástricas/patologíaRESUMEN
HER2 protein overexpression by immunohistochemistry (IHC) and/or erB2 gene amplification by in situ hybridization (ISH) was detected in 4-28% of gastric or gastro-oesophageal junction (GOJ) cancers. Most studies have shown that HER2-overexpressing gastric cancers were worse prognosis. Trastuzumab is a humanized monoclonal antibody directed against HER2 with known efficacy in patients with HER2+ early or metastatic breast cancer. The international randomized trial ToGA study showed the superiority of the combination of trastuzumab with chemotherapy doublet fluoropyrimidine (5-FU or capecitabine) plus cisplatin (FP) every three weeks compared with chemotherapy alone in terms of overall survival : 13.8 versus 11.1 months (HR: 0.74, 95% CI: 0.60-0.91, P = 0.0046) in HER2+ advanced gastric cancers. The benefit was even greater in the subgroup with HER2 overexpression (16% of the screened population) as defined by IHC3+ or IHC2+ confirmed by positive ISH test. Trastuzumab plus FP chemotherapy has become the standard treatment for patients with HER2+ non-pretreated metastatic adenocarcinoma of the stomach or GOJ cancer. All these cancers should be tested for HER2 on paraffin block resection or biopsy specimens of the primary tumour or metastases. Endoscopic gastric biopsies should be multiple. The IHC should be the initial test. The standardized immunohistochemical scoring system differs from that recommended for breast cancer given the heterogeneity of HER2 expression and the frequency of incomplete membranous staining in gastric cancers. Equivocal IHC2+ tumours should be tested by ISH with two tools: fluorescence in situ hybridization (FISH) or bright field in situ hybridization (SISH). The perspectives are the assessment of trastuzumab in the perioperative and adjuvant setting, the development of novel anti-HER2 drugs and research into mechanisms of resistance and predictive molecular markers.
Asunto(s)
Anticuerpos Monoclonales/uso terapéutico , Antineoplásicos/uso terapéutico , Unión Esofagogástrica , Receptor ErbB-2/análisis , Neoplasias Gástricas/tratamiento farmacológico , Anticuerpos Monoclonales/administración & dosificación , Anticuerpos Monoclonales/efectos adversos , Anticuerpos Monoclonales Humanizados , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Capecitabina , Cisplatino/administración & dosificación , Contraindicaciones , Desoxicitidina/administración & dosificación , Desoxicitidina/análogos & derivados , Fluorouracilo/administración & dosificación , Fluorouracilo/análogos & derivados , Humanos , Inmunohistoquímica/métodos , Hibridación in Situ/métodos , Adhesión en Parafina , Ensayos Clínicos Controlados Aleatorios como Asunto , Receptor ErbB-2/antagonistas & inhibidores , Neoplasias Gástricas/química , TrastuzumabRESUMEN
Extranodal marginal-zone lymphoma of mucosa-associated lymphoid tissue of the stomach (gastric MALT lymphoma) is derived from memory B cells of the marginal zone. Normal memory B cells do not express markers of germinal-center B cells, such as E2A (immunoglobulin enhancer-binding factor E12/E47), B-cell chronic lymphocytic leukemia/lymphoma 6 (BCL6), or activation-induced cytidine deaminase (AID). E2A is a transcription factor that induces somatic hypermutations and blocks plasma cell differentiation. In 50 stage-I(E)/II(E1) gastric MALT lymphomas, we confirmed that all cases were BCL6(-)/AID(-), but a subset (50%, 25/50) was E2A(+). As E2A(-) and E2A(+) gastric MALT lymphomas had similar numbers of somatic hypermutations without intraclonal variations, which implied an origin from memory B cells, the expression of E2A was best regarded as a marker of aberrant follicular differentiation. Although the status of somatic hypermutation was not affected by E2A, E2A(+) gastric MALT lymphoma showed less plasmacytoid infiltrates and higher expressions of miRNA-223, a microRNA associated with memory B cells. Clinically, E2A(+) gastric MALT lymphomas were more likely to spread to perigastric lymph nodes and were less responsive to Helicobacter eradication therapy than were E2A(-) gastric MALT lymphomas. Taken together, aberrant E2A expression is a diagnostic feature of a subtype of gastric MALT lymphoma with weaker plasmacytoid infiltrates and stronger miR-223 expression. A prospective study would be necessary to verify the association between E2A expression and a poor response to Helicobacter eradication therapy.
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Linfocitos B/química , Factores de Transcripción con Motivo Hélice-Asa-Hélice Básico/análisis , Biomarcadores de Tumor/análisis , Memoria Inmunológica , Ganglios Linfáticos/química , Linfoma de Células B de la Zona Marginal/química , MicroARNs/análisis , Células Plasmáticas/química , Neoplasias Gástricas/química , Linfocitos B/inmunología , Linfocitos B/patología , Biopsia , Diferenciación Celular , Análisis por Conglomerados , Citidina Desaminasa/análisis , Proteínas de Unión al ADN/análisis , Regulación Neoplásica de la Expresión Génica , Genes de las Cadenas Pesadas de las Inmunoglobulinas , Infecciones por Helicobacter/tratamiento farmacológico , Infecciones por Helicobacter/microbiología , Helicobacter pylori/patogenicidad , Humanos , Inmunohistoquímica , Ganglios Linfáticos/inmunología , Ganglios Linfáticos/patología , Linfoma de Células B de la Zona Marginal/genética , Linfoma de Células B de la Zona Marginal/inmunología , Linfoma de Células B de la Zona Marginal/microbiología , Linfoma de Células B de la Zona Marginal/patología , Linfoma de Células B de la Zona Marginal/terapia , Mutación , Estadificación de Neoplasias , Células Plasmáticas/inmunología , Células Plasmáticas/patología , Proteínas Proto-Oncogénicas/análisis , Proteínas Proto-Oncogénicas c-bcl-6 , Estudios Retrospectivos , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa , Neoplasias Gástricas/genética , Neoplasias Gástricas/inmunología , Neoplasias Gástricas/microbiología , Neoplasias Gástricas/patología , Neoplasias Gástricas/terapia , Taiwán , Resultado del TratamientoAsunto(s)
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Biomarcadores de Tumor/análisis , Gastrectomía , Neoplasias Gástricas/tratamiento farmacológico , Protocolos de Quimioterapia Combinada Antineoplásica/administración & dosificación , Protocolos de Quimioterapia Combinada Antineoplásica/efectos adversos , Quimioterapia Adyuvante , Cisplatino/administración & dosificación , Supervivencia sin Enfermedad , Epirrubicina/administración & dosificación , Fluorouracilo/administración & dosificación , Humanos , Italia , Leucovorina/administración & dosificación , Ensayos Clínicos Controlados Aleatorios como Asunto , Neoplasias Gástricas/química , Neoplasias Gástricas/patología , Neoplasias Gástricas/cirugía , Resultado del Tratamiento , Reino UnidoRESUMEN
BACKGROUND: Complete surgical resection of gastric cancer is potentially curative, but long-term survival is poor. METHODS: Patients with histologically proven adenocarcinoma of the stomach of stages IB, II, IIIA and B, or IV (T4N2M0) and treated with potentially curative surgery were randomly assigned to follow-up alone or to intravenous treatment with four cycles (repeated every 21 days) of PELF (cisplatin [40 mg/m(2), on days 1 and 5], epirubicin [30 mg/m(2), days 1 and 5], L-leucovorin [100 mg/m(2), days 1-4], and 5-fluorouracil [300 mg/m(2), days 1-4] in a hospital setting. Frequencies and severity of adverse events were determined. Overall survival (OS) and disease-free survival (DFS) were compared between the treatment arms using Kaplan-Meier analysis and a Cox proportional hazards regression model. All statistical tests were two-sided. RESULTS: From January 1995 through September 2000, 258 patients were randomly assigned to chemotherapy (n = 130) or surgery alone (n = 128). Patient characteristics were well balanced between the two arms. Among those who received chemotherapy, grade 3 or 4 toxic effects including vomiting, mucositis, and diarrhea were experienced by 21.1%, 8.4%, and 11.8% of patients, respectively. Leucopenia, anemia, and thrombocytopenia of grade 3 or 4 were experienced by 20.3%, 3.3%, and 4.2% of patients, respectively. After a median follow-up of 72.8 months, 128 patients (49.6%) experienced recurrence and 139 (53.9%) deaths were observed, one toxicity-related. Relative to treatment with surgery alone, adjuvant chemotherapy did not increase disease-free survival (hazard ratio [HR] of recurrence = 0.92; 95% confidence interval [CI] = 0.66 to 1.27) or overall survival (HR of death = 0.90; 95% CI = 0.64 to 1.26). CONCLUSIONS: Our results failed to provide proof of an effect of adjuvant chemotherapy with PELF on overall survival or disease-free survival. The estimated effect of chemotherapy (10% reduction in the hazard of death or relapse) is modest and consistent with the results of meta-analyses of adjuvant chemotherapy without platinum agents.
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Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Biomarcadores de Tumor/análisis , Gastrectomía , Neoplasias Gástricas/tratamiento farmacológico , Adulto , Anciano , Protocolos de Quimioterapia Combinada Antineoplásica/administración & dosificación , Protocolos de Quimioterapia Combinada Antineoplásica/efectos adversos , Quimioterapia Adyuvante , Cisplatino/administración & dosificación , Diarrea/inducido químicamente , Supervivencia sin Enfermedad , Epirrubicina/administración & dosificación , Femenino , Fluorouracilo/administración & dosificación , Gastrectomía/métodos , Enfermedades Hematológicas/inducido químicamente , Humanos , Inmunohistoquímica , Italia , Estimación de Kaplan-Meier , Leucovorina/administración & dosificación , Escisión del Ganglio Linfático , Metástasis Linfática , Masculino , Persona de Mediana Edad , Mucositis/inducido químicamente , Estadificación de Neoplasias , Cooperación del Paciente , Pronóstico , Modelos de Riesgos Proporcionales , Neoplasias Gástricas/química , Neoplasias Gástricas/patología , Neoplasias Gástricas/cirugía , Resultado del Tratamiento , Vómitos/inducido químicamenteRESUMEN
A new discrimination method called the score-moment combined linear discrimination analysis (SMC-LDA) has been developed and its performance has been evaluated using three practical spectroscopic datasets. The key concept of SMC-LDA was to use not only the score from principal component analysis (PCA), but also the moment of the spectrum, as inputs for LDA to improve discrimination. Along with conventional score, moment is used in spectroscopic fields as an effective alternative for spectral feature representation. Three different approaches were considered. Initially, the score generated from PCA was projected onto a two-dimensional feature space by maximizing Fisher's criterion function (conventional PCA-LDA). Next, the same procedure was performed using only moment. Finally, both score and moment were utilized simultaneously for LDA. To evaluate discrimination performances, three different spectroscopic datasets were employed: (1) infrared (IR) spectra of normal and malignant stomach tissue, (2) near-infrared (NIR) spectra of diesel and light gas oil (LGO) and (3) Raman spectra of Chinese and Korean ginseng. For each case, the best discrimination results were achieved when both score and moment were used for LDA (SMC-LDA). Since the spectral representation character of moment was different from that of score, inclusion of both score and moment for LDA provided more diversified and descriptive information.
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Interpretación Estadística de Datos , Procesamiento de Señales Asistido por Computador , Análisis Espectral/métodos , Contaminantes Ambientales/química , Aceites/química , Panax/química , Análisis de Componente Principal , Sensibilidad y Especificidad , Estómago/química , Neoplasias Gástricas/químicaRESUMEN
OBJECTIVE: The aim of this study was to measure spontaneous photon emission (SPE) and delayed luminescence (DL) from various human cancer tissues. MATERIALS AND METHODS: A photomultiplier tube attached to a dark chamber was used for the detection of ultraweak photon emission from cancer tissues in the chamber. The samples were illuminated with a 150 W metal halide lamp for the measurement of delayed luminescence. Frozen tissues were provided by the hospitals and preserved in saline solution in a CO2 incubator for 1 hour before starting the measurement of spontaneous photon emission. We successively measured the afterglows from the samples after 30-second irradiation of the lamp. The samples were divided into two groups: tumor tissues and normal tissues around tumor tissues. We presented experimental data and interpreted their characteristic patterns of spontaneous photon emission and delayed luminescence. RESULTS: Mean values of spontaneous photon emissions from the normal tissues and the tumor tissues were measured with the standard errors of the mean as 625 +/- 419 counts/minute/cm2 (n = 6) and 982 +/- 513 counts/minute/cm2 (n = 14), respectively. Peak values of the intensity of delayed luminescence from normal and cancerous tissues were 63 +/- 20 counts/ms (n = 6) and 48 +/- 12 counts/ms (n = 14). CONCLUSIONS: The intensity of spontaneous photon emissions from cancer tissues were mostly discriminated from those of normal tissues, and their delayed luminescent properties were investigated.
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Luminiscencia , Neoplasias/química , Fotones , Adenocarcinoma/química , Humanos , Técnicas In Vitro , Leiomiosarcoma/química , Mediciones Luminiscentes , Neoplasias Gástricas/químicaRESUMEN
Extracts of Artemisia asiatica Nakai (Asteraceae) possess anti-inflammatory and antioxidative activities. Eupatilin (5,7-dihydroxy-3',4', 6-trimethoxyflavone), one of the pharmacologically active ingredients derived from A. asiatica was shown to induce apoptosis in human promyelocytic leukemia (HL-60) cells. In the present study, we examined the ability of eupatilin to induce apoptosis in human gastric cancer (AGS) cells. Eupatilin induced the apoptosis of AGS cells as revealed by a decrease in the ratio of pro-apoptotic Bax and anti-apoptotic Bcl-2, as well as the cleavage of caspase-3 and poly(ADP-ribose)polymerase (PARP). The pro-apoptotic effects of eupatilin were further verified by its perturbation of the mitochondrial transmembrane potential (DeltaPsim). In addition, eupatilin treatment led to an elevated expression of p53 and p21. Eupatilin inhibited the activation of ERK1/2 and Akt, which are important components of cell-survival pathways.
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Apoptosis/efectos de los fármacos , Artemisia , Medicamentos Herbarios Chinos/farmacología , Flavonoides/farmacología , Neoplasias Gástricas/patología , Caspasa 3 , Caspasas/metabolismo , Línea Celular Tumoral , Inhibidor p21 de las Quinasas Dependientes de la Ciclina/genética , Inhibidor p21 de las Quinasas Dependientes de la Ciclina/metabolismo , Quinasas MAP Reguladas por Señal Extracelular/genética , Quinasas MAP Reguladas por Señal Extracelular/metabolismo , Regulación Neoplásica de la Expresión Génica/efectos de los fármacos , Humanos , Potenciales de la Membrana/efectos de los fármacos , Membranas Mitocondriales/efectos de los fármacos , Membranas Mitocondriales/fisiología , Poli(ADP-Ribosa) Polimerasas/metabolismo , Proteínas Proto-Oncogénicas c-akt/genética , Proteínas Proto-Oncogénicas c-akt/metabolismo , Proteínas Proto-Oncogénicas c-bcl-2/metabolismo , Neoplasias Gástricas/química , Neoplasias Gástricas/metabolismo , Proteína p53 Supresora de Tumor/genética , Proteína p53 Supresora de Tumor/metabolismo , Proteína X Asociada a bcl-2/metabolismoRESUMEN
PURPOSE: It is well known that both gastric and intestinal phenotypic markers are expressed in gastric carcinomas, irrespective of their histological type. In the present study, the associations among phenotypic marker expression of gastric carcinomas, tumor thymidylate synthase (TS) expression, and the chemotherapeutic response to 5-fluorouracil (5-FU) were examined. METHODS: The gastric and intestinal phenotypic marker expression of the tumor was determined by the combination of the expression of human gastric mucin (HGM), MUC6, MUC2, and CD10, and was evaluated in comparison with tumor TS expression in 137 advanced gastric carcinomas in 137 patients (75 with postoperative chemotherapy with 5-FU and 62 without postoperative chemotherapy). Tumors were classified into the gastric- (G-), gastric and intestinal mixed- (GI-), intestinal- (I-), or unclassified- (UC-) phenotype according to the immunopositivity of HGM, MUC6, MUC2, and CD10 stainings. The associations among the gastric and intestinal phenotypic marker expression of the tumor, tumor TS expression, effect of postoperative chemotherapy with 5-FU, and the patient's prognosis were examined. RESULTS: Of the 137 gastric carcinomas, 48 (35.0%), 58 (42.3%), 23 (16.8%), and 8 (5.8%)were classified as the G-, GI-, I- and UC-phenotype, respectively. The high TS expression of more than 25% tumor cell positivity was found in 25 (52.1%) of the 48 G-phenotype tumors, 39 (67.2%) of the 58 GI-phenotype tumors, 18 (78.3%) of the 23 I-phenotype tumors, and 4 (50.0%) of the 8 UC-phenotype tumors. The I-phenotype tumors were significantly correlated with the higher rate of the high TS expression as compared with the G-phenotype tumors (P<0.05). Among 48 patients with the G-phenotype tumor, the 5-year survival rate in patients with and without postoperative chemotherapy was 39.7 and 27.8%, respectively. The patients with postoperative chemotherapy had a significantly better prognosis than those without postoperative chemotherapy (P<0.05). Conversely, there were no significant correlations between the presence of postoperative chemotherapy and the patient's prognosis among patients with GI-, I-, and UC-phenotype tumors. CONCLUSIONS: These results indicate that postoperative chemotherapy with 5-FU could be effective for patients with the G-phenotype tumor, since the incidence of intratumoral expression of TS, the target enzyme of 5-FU, is significantly low in G-phenotype tumors.
Asunto(s)
Antimetabolitos Antineoplásicos/uso terapéutico , Biomarcadores de Tumor/análisis , Fluorouracilo/uso terapéutico , Gastrectomía , Neoplasias Gástricas/tratamiento farmacológico , Neoplasias Gástricas/enzimología , Timidilato Sintasa/análisis , Anciano , Quimioterapia Adyuvante , Femenino , Regulación Enzimológica de la Expresión Génica , Regulación Neoplásica de la Expresión Génica , Humanos , Inmunohistoquímica , Intestinos/química , Masculino , Persona de Mediana Edad , Fenotipo , Valor Predictivo de las Pruebas , Neoplasias Gástricas/química , Neoplasias Gástricas/patología , Neoplasias Gástricas/cirugía , Resultado del TratamientoRESUMEN
Both 5-fluorouracil and doxorubicin are commonly used agents in chemotherapy of gastric cancer in adjuvant setting as well as metastatic disease. In a variety of malignancies, high expression of multidrug resistance-associated protein1 and P-glycoprotein has been associated with resistance to doxorubicin, whereas 5-fluorouracil resistance has correlated with the level of thymidylate synthase expression. We evaluated the expression of multidrug resistance-associated protein1, P-glycoprotein, and thymidylate synthase using immunohistochemistry in 103 locally advanced gastric cancer patients (stage IB-IV) who underwent 5-fluorouracil and doxorubicin-based adjuvant chemotherapy after curative resection and investigated the association between their expression and clinicopathologic characteristics including prognosis of the patients. While high expression (> or =5% of tumour cells positive) of multidrug resistance-associated protein1 and P-glycoprotein was observed in 70 patients (68%) and 42 patients (41%), respectively, 65 patients (63%) had primary tumours with high expression (> or =25% of tumour cells positive) of thymidylate synthase. There was a significant association between multidrug resistance-associated protein1 and P-glycoprotein expression (P<0.0001) as well as P-glycoprotein and thymidylate synthase expression (P<0.0001). High multidrug resistance-associated protein1 and P-glycoprotein expressions were associated with well and moderately differentiated histology (P<0.0001 and P=0.03, respectively) and intestinal type (P<0.0001 and P=0.009, respectively). High multidrug resistance-associated protein1 expression correlated with lymph node metastasis (P=0.037), advanced stage (P=0.015), and older age (P=0.021). Five-year disease-free survival and overall survival of total patients were 55.2% and 56.2%, respectively, with a median follow-up of 68 months. There were no significant differences in disease-free survival and overall survival according to the expression of multidrug resistance-associated protein1 (P=0.902 and P=0.975, respectively), P-glycoprotein (P=0.987 and P=0.955, respectively), and thymidylate synthase (P=0.604 and P=0.802, respectively). Concurrent high expression of these proteins (high multidrug resistance-associated protein1/P-glycoprotein, high multidrug resistance-associated protein1/thymidylate synthase, high P-glycoprotein/thymidylate synthase) did not correlate with disease-free survival or overall survival. Even high expression of all three proteins was not associated with poor disease-free survival (P=0.919) and overall survival (P=0.852). In conclusion, high expression of multidrug resistance-associated protein1, P-glycoprotein, and thymidylate synthase did not predict poor prognosis of gastric cancer patients treated with 5-fluorouracil and doxorubicin-based adjuvant chemotherapy. A larger study including patients treated with surgical resection alone would be necessary.
Asunto(s)
Miembro 1 de la Subfamilia B de Casetes de Unión a ATP/análisis , Adenocarcinoma/química , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Resistencia a Múltiples Medicamentos , Resistencia a Antineoplásicos , Gastrectomía , Proteínas de Neoplasias/análisis , Neoplasias Gástricas/química , Timidilato Sintasa/análisis , Adenocarcinoma/tratamiento farmacológico , Adenocarcinoma/mortalidad , Adenocarcinoma/cirugía , Adenocarcinoma/terapia , Anciano , Quimioterapia Adyuvante , Terapia Combinada , Supervivencia sin Enfermedad , Doxorrubicina/administración & dosificación , Femenino , Fluorouracilo/administración & dosificación , Humanos , Inmunoterapia , Lentinano/administración & dosificación , Tablas de Vida , Masculino , Persona de Mediana Edad , Mitomicina/administración & dosificación , Picibanil/administración & dosificación , Neoplasias Gástricas/tratamiento farmacológico , Neoplasias Gástricas/mortalidad , Neoplasias Gástricas/cirugía , Neoplasias Gástricas/terapia , Análisis de SupervivenciaRESUMEN
Prognostic value of clinicopathologic factors and biologic markers was analyzed in 185 patients who received a curative resection and adjuvant chemotherapy of pathologically confirmed stage II or III gastric cancer. No difference was found between the chemotherapeutic regimens according to the frequency of recurrence, but tumor type, histology, depth of invasion, nodal metastasis, and lymphatic and venous invasion were significantly different between recurrent (n=62) and non-recurrent (n=123) patients. However, the degree of lymphatic dissection and the patterns of biological markers (DNA ploidy, p53 staining and PCNA labeling) were not different. Hepatic metastasis and venous invasion were more frequent on patients recurring within one year, compared to those who recurred later. Multivariate analyses showed that depth of invasion, level 2 lymph node metastasis and tumor histology were risk factors for recurrence. Pathologic factors were more important for predicting recurrence than biological markers.
Asunto(s)
Adenocarcinoma/cirugía , Biomarcadores de Tumor/análisis , Quimioterapia Adyuvante , ADN de Neoplasias/análisis , Gastrectomía , Proteínas de Neoplasias/análisis , Recurrencia Local de Neoplasia/epidemiología , Antígeno Nuclear de Célula en Proliferación/análisis , Neoplasias Gástricas/cirugía , Proteína p53 Supresora de Tumor/análisis , Adenocarcinoma/química , Adenocarcinoma/tratamiento farmacológico , Adenocarcinoma/patología , Adulto , Anciano , Aneuploidia , Antimetabolitos Antineoplásicos/uso terapéutico , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Terapia Combinada , Epirrubicina/administración & dosificación , Femenino , Fluorouracilo/administración & dosificación , Fluorouracilo/uso terapéutico , Estudios de Seguimiento , Humanos , Técnicas para Inmunoenzimas , Neoplasias Hepáticas/secundario , Metástasis Linfática , Masculino , Persona de Mediana Edad , Mitomicina/administración & dosificación , Invasividad Neoplásica , Estadificación de Neoplasias , Periodo Posoperatorio , Pronóstico , Factores de Riesgo , Neoplasias Gástricas/química , Neoplasias Gástricas/tratamiento farmacológico , Neoplasias Gástricas/patología , Resultado del TratamientoRESUMEN
The first clinical application of biochemical modulation (BCM) of 5-fluorouracil (5-FU) was the sequential MTX/5-FU regimen proposed in 1977 by Bertino for the treatment of colorectal cancer. In Japan, sequential MTX/5-FU therapy was mainly used as a new method of treating gastric cancer, and attracted a great deal of attention because it proved effective in many cases of advanced gastric cancer that had been unresponsive to the previous chemotherapy, particularly scirrhous gastric cancer with poor prognosis. Its therapeutic efficacy varied according to histologic type, it was effective in cases of peritoneal dissemination and disseminated intravascular coagulopathy (DIC), it was associated with fewer adverse effects, and it was a multidrug chemotherapy based on a clear rationale. With sequential MTX/5-FU therapy as a starting point, fundamental studies of BCM and its clinical applications have expanded rapidly in Japan. This paper provides an outline of sequential MTX/5-FU therapy from the aspects of its mechanism of action, indications, therapeutic efficacy, relevance to adjuvant therapy, counter-measures to adverse effects, and emergence of resistance to the drugs involved. The high therapeutic efficacy of this therapy in certain histologic types is also discussed, and its combined use with other forms of BCM, as in triple BCM (LV/5-FU + CDDP/5-FU + MTX/5-FU), is introduced.
Asunto(s)
Protocolos de Quimioterapia Combinada Antineoplásica/farmacología , Fluorouracilo/farmacología , Metotrexato/farmacología , Neoplasias Gástricas/tratamiento farmacológico , Animales , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , ADN/biosíntesis , Esquema de Medicación , Sinergismo Farmacológico , Fluorouracilo/administración & dosificación , Humanos , Metotrexato/administración & dosificación , Neoplasias Gástricas/químicaRESUMEN
The contents of 10 minor and trace elements in histologically confirmed gastric adenocarcinomas and their corresponding normal gastric mucosal tissues obtained from 39 patients at the time of gastric resection were simultaneously determined by instrumental neutron activation analysis. Specimens were irradiated by reactor neutrons and subsequently subject to direct analysis using a high-resolution HPGe gamma-spectrometer. Univariate analysis revealed that gastric cancer tissues had significantly higher concentrations of Fe, K, Mg, Na, Rb, Se, and Zn than normal gastric mucosal tissues. However, multivariate analysis found that Fe, K, and Se were independent elements that associated with gastric cancer. Upon further evaluation of their clinical significance, we found a high tissue K level was related to lymphatic duct metastasis. High Se tissue levels were linked to intestinal type adenocarcinoma. A positive correlation was found between high Fe levels and vascular involvement. These findings suggest that Fe and K are associated with gastric cancer progression. Se is involved in carcinogenesis of stomach in high-risk areas. The mechanisms that underlie the corresponding pathohistological features deserve further study.
Asunto(s)
Adenocarcinoma/química , Hierro/análisis , Potasio/análisis , Selenio/análisis , Neoplasias Gástricas/química , Adenocarcinoma/patología , Anciano , Femenino , Mucosa Gástrica/química , Humanos , Masculino , Persona de Mediana Edad , Análisis Multivariante , Análisis de Activación de Neutrones , Espectrometría gamma , Neoplasias Gástricas/patología , Oligoelementos/análisisRESUMEN
The expression of integrin Alpha-6-subunit, laminin, type IV collagenase, type IV collagen and ras p21 were studied immunohistochemically in gastric cancer. The results showed that the expression of alpha 6 and laminin (LN) was often in continuous or interrupted linear pattern in the expanding type of gastric carcinoma (GC); while in the infiltrating type of GC, they were expressed either in interrupted spotty or fragmentary pattern, or almost lost. Suggesting that the interaction between the laminin receptor and its ligand may influence the mode of growth in GC. Intense expression of type IV collagenase was often found in GC cells, especially in the infiltrative type of GC and in those with lymph node metastasis, it can therefore be used as a marker for invasion and metastasis of GC cells. A positive correlation was found between the expression of type IV collagenase and ras p21 in GC. The expression of type IV collagen was similar to that of laminin, but in reverse proportion to the expression of type IV collagenase. These investigations provide a better understanding of the molecular pathological basis of tumor invasion and metastasis.
Asunto(s)
Colagenasas/metabolismo , Integrinas/metabolismo , Neoplasias Gástricas/química , Neoplasias Gástricas/patología , Ejercicios Respiratorios , Matriz Extracelular/química , Humanos , Integrina alfa6beta1 , Metástasis Linfática , Metaloproteinasa 9 de la Matriz , Invasividad Neoplásica , Metástasis de la Neoplasia , Proteínas Proto-Oncogénicas p21(ras)/metabolismo , Receptores de Laminina/metabolismoRESUMEN
In order to study the influence of erbB-2 protein overexpression on outcome of patients with gastric cancer after attempted curative resection with or without adjuvant chemotherapy, paraffin embedded sections from 109 cases of primary gastric cancer with defined treatments have been immunostained for erbB-2 protein in a retrospective study. Thirty four cases (31%) showed strong membrane staining of tumor cells. erbB-2 overexpression did not show significant effect on outcome when all patients were considered. However, erbB-2 overexpression was an indicator for poor disease free survival (p = 0.0474), local relapse free survival (p = 0.0293), and overall survival (p = 0.0310) of the patients treated with surgery only (N = 51), while it did not show any effect on outcome of patients treated with 5-FU plus Doxorubicin (FA) as adjuvant chemotherapy (N = 58). Furthermore, the apparent therapeutic benefit from FA regimen was restricted to patients with erbB-2 positive tumors. Combined predictive value of erbB-2 and FA regimen was found to be significant in predicting local relapse in multivariate analysis (p = 0.0439). The data suggests that erbB-2 may be associated with an improved response to FA regimen and that erbB-2 should be included as a potential confounding variable in the analysis of the data from the clinical trials for gastric cancer.
Asunto(s)
Adenocarcinoma/química , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Biomarcadores de Tumor/análisis , Proteínas Proto-Oncogénicas/análisis , Neoplasias Gástricas/química , Adenocarcinoma/mortalidad , Adenocarcinoma/terapia , Quimioterapia Adyuvante , Doxorrubicina/administración & dosificación , Fluorouracilo/administración & dosificación , Gastrectomía , Humanos , Persona de Mediana Edad , Valor Predictivo de las Pruebas , Receptor ErbB-2 , Estudios Retrospectivos , Neoplasias Gástricas/mortalidad , Neoplasias Gástricas/terapia , Tasa de SupervivenciaRESUMEN
A novel gene product which is immunologically related to carcinoembryonic antigen (CEA) and constitutively expressed by six of eight human gastric carcinoma cell lines is described. The antigen was initially identified by the differential binding patterns of four monoclonal antibodies (MAbs) which recognize the putative Mr 180,000 CEA and/or the Mr 90,000 CEA-related gene product, NCA (normal cross-reacting antigen). Western blot analyses of partially purified membrane fractions prepared from Hs 746T gastric carcinoma cells identified an Mr 110,000 antigen. Northern blot analyses using CEA- and NCA-specific complementary DNA probes did not identify any specific CEA or NCA transcripts in polyadenylate-selected mRNA isolated from the Hs 746T cells. Likewise, a probe designed to hybridize with different CEA-related family members failed to identify a CEA-related message in the Hs 746T cells. Subsequent studies revealed that interferon-gamma (IFN-gamma) treatment substantially increased the level of expression of the Mr 110,000 antigen on the Hs 746T and five other gastric cell types that constitutively expressed the antigen. IFN-gamma treatment also de novo induced the expression of the Mr 110,000 antigen on the surface of GaCa gastric carcinoma cells. A high percentage of Hs 746T (i.e., greater than 85%) and GaCa (approximately 75%) gastric carcinoma cells expressed the Mr 110,000 antigen after IFN-gamma treatment; yet, neither cell type expressed CEA or NCA as measured by the binding of the anti-CEA MAb, COL-1, or B6.2, an anti-NCA MAb. In contrast to CEA and NCA, phosphatidylinositol phospholipase C treatment failed to release the Mr 110,000 antigen from the surface of the Hs 746T or IFN-gamma-treated GaCa cells, suggesting that membrane attachment of this novel antigen is not via a glycosyl-phosphatidylinositol anchor. Finally, primers that amplify the 420 base pairs of the immunoglobulin-like domain of CEA and NCA detected an appropriately sized product in untreated as well as IFN-gamma-treated GaCa cells using the polymerase chain reaction method. Thus, a potentially novel gene product coding for an Mr 110,000 antigen that is strongly upregulated by IFN-gamma has been identified in human gastric carcinoma cells. Immunologically, the antigen shares reactive epitopes with CEA and its related NCA gene product; however, Northern blot analyses, polymerase chain reaction, and phosphatidylinositol phospholipase C results suggest that the antigen may be, at best, a distant relative of the CEA gene family.