GATA-3 is a proto-oncogene in T-cell lymphoproliferative neoplasms.

Neoplasms originating from thymic T-cell progenitors and post-thymic mature T-cell subsets account for a minority of lymphoproliferative neoplasms. These T-cell derived neoplasms, while molecularly and genetically heterogeneous, exploit transcription factors and signaling pathways that are critically important in normal T-cell biology, including those implicated in antigen-, costimulatory-, and cytokine-receptor signaling. The transcription factor GATA-3 regulates the growth and proliferation of both immature and mature T cells and has recently been implicated in T-cell neoplasms, including the most common mature T-cell lymphoma observed in much of the Western world. Here we show that GATA-3 is a proto-oncogene across the spectrum of T-cell neoplasms, including those derived from T-cell progenitors and their mature progeny, and further define the transcriptional programs that are GATA-3 dependent, which include therapeutically targetable gene products. The discovery that p300-dependent acetylation regulates GATA-3 mediated transcription by attenuating DNA binding has novel therapeutic implications. As most patients afflicted with GATA-3 driven T-cell neoplasms will succumb to their disease within a few years of diagnosis, these findings suggest opportunities to improve outcomes for these patients.

Detection of Helicobacter pylori in gastric cancer tissue through histopathology, immunohistochemistry and real-time reverse transcription-PCR.

Aim:Helicobacter pylori is usually detected based on hematoxylin-eosin (H-E) features, but, immunohistochemistry (IHC) and real-time PCR (RT-PCR) are more precise in chronic-gastritis. We evaluated the relevance of these tests in Peruvian gastric cancer samples. Materials & methods: We performed and evaluated H-E, IHC staining and RT-PCR in 288 gastric tumors. Slides were independently evaluated by three pathologists. Results:H. pylori was detected in 167/287 through H-E, 140/288 through IHC and 175/288 through RT-PCR, and positive-status were associated (p < 0.001). H. pylori detection by H-E had a good concordance with IHC (kappa index = 0.632) but poor with RT-PCR (kappa index = 0.317). Higher median gene-copies were found in high H. pylori density through H-E or IHC (p < 0.001). Conclusion: H-E evaluation is accurate in gastric cancer, and IHC and RT-PCR can complement its results.

Level of tumor-infiltrating lymphocytes and density of infiltrating immune cells in different malignancies.

Aim: To correlate levels of tumor-infiltrating lymphocytes (TIL) evaluated using the International Immuno-Oncology Biomarker Working Group methodology, and both density of tumor-infiltrating immune cell and clinicopathological features in different malignancies. Methods: 209 pathological samples from gastric cancer, cervical cancer (CC), non-small-lung cancer, cutaneous melanoma (CM) and glioblastoma were tested for TIL in hematoxylin eosin, and density of CD3+, CD4+, CD8+, CD20+, CD68+ and CD163+ cells by digital analysis. Results: TIL levels were higher in invasive margin compartments (IMC). TIL in IMC, intratumoral and stromal compartments predicted survival. CC and gastric cancer had higher TIL in intratumoral; CC and CM had higher TIL in stromal compartment and IMC. CM had the highest density of lymphocyte and macrophage populations. CD20 density was associated with survival in the whole series. Conclusion: Standardized evaluation of TIL levels may provide valuable prognostic information in a spectrum of different malignancies.

Tumor Protein p53 and K-ras Gene Mutations in Peruvian Patients with Gallbladder Cancer

Background: Recent studies have shown that genetic alterations are associated with the effect of patient geographic location on gallbladder cancer development. Peru has a high incidence of gallbladder cancer, but causative factors have not yet been identified. We examined the frequency of mutations in TP53 and K-ras genes in Peruvian patients with gallbladder cancer, and compared this with data from Bolivia, Hungary, Chile, and Japan, which have a high gallbladder cancer incidence. Methods: DNA was extracted from formalin-fixed paraffin-embedded gallbladder tissue sections of 30 gallbladder cancer patients (9 men and 21 women) obtained using microdissection. Mutations in exons 5 to 8 of TP53 and codons 12, 13, and 61 of K-ras were examined using direct sequencing. Results: TP53 mutations were observed in 10 (33.3%) of patients, but K-ras mutations were absent. Nine (90%) TP53 mutations were point mutations (7 missense and 2 silent mutations), and the most frequent substitution was a G:C to A:T transition. G:C to A:T transitions at the CpG site or G:C to T:A transversions were found in one patient each. No significant differences were found in the frequency of TP53 and K-ras mutations among patients in the 5 countries. Conclusions: Our findings suggest that endogenous mechanisms and exogenous carcinogens may affect the carcinogenic process in Peruvian gallbladder cancer patients, similar to that in Bolivian patients. Further studies with a larger sample size are needed to clarify these findings.

Distribution of tumor-infiltrating immune cells in glioblastoma.

AIM: Evaluation of features related to infiltrating immune cell level in glioblastoma. METHODS: Tumor-infiltrating lymphocytes (TILs) through H&E staining, and TILs (CD3, CD4, CD8 and CD20) and macrophage (CD68 and CD163) levels through immunohistochemistry were evaluated through digital analysis. RESULTS: CD68 (9.1%), CD163 (2.2%), CD3 (1.6%) and CD8 (1.6%) had the highest density. Higher CD4+ was associated with unmethylated MGMT (p = 0.016). Higher CD8+ was associated with larger tumoral size (p = 0.027). Higher CD163+ was associated with higher age (p = 0.044) and recursive partitioning analysis = 4. Women (p < 0.05), total resection (p < 0.05), MGMT-methylation (p < 0.001), radiotherapy (p < 0.001), chemotherapy (p < 0.001) and lower CD4+ (p < 0.05) were associated with longer overall survival. CONCLUSION: Macrophages are more frequent than TILs. Some subsets are associated with clinical features.

Breast cancer subtype and survival among Indigenous American women in Peru.

Latina women in the U.S. have relatively low breast cancer incidence compared to Non-Latina White (NLW) or African American women but are more likely to be diagnosed with the more aggressive "triple negative" breast cancer (TNBC). Latinos in the U.S. are a heterogeneous group originating from different countries with different cultural and ancestral backgrounds. Little is known about the distribution of tumor subtypes in Latin American regions. Clinical records of 303 female Peruvian patients, from the Peruvian National Cancer Institute, were analyzed. Participants were diagnosed with invasive breast cancer between 2010 and 2015 and were identified as residing in either the Selva or Sierra region. We used Fisher's exact test for proportions and multivariable Cox Proportional Hazards Models to compare overall survival between regions. Women from the Selva region were more likely to be diagnosed with TNBC than women from the Sierra region (31% vs. 14%, p = 0.01). In the unadjusted Cox model, the hazard of mortality was 1.7 times higher in women from the Selva than the Sierra (p = 0.025); this survival difference appeared to be largely explained by differences in the prevalence of TNBC. Our results suggest that the distribution of breast cancer subtypes differs between highly Indigenous American women from two regions of Peru. Disentangling the factors that contribute to this difference will add valuable information to better target prevention and treatment efforts in Peru and improve our understanding of TNBC among all women. This study demonstrates the need for larger datasets of Latin American patients to address differences between Latino subpopulations and optimize targeted prevention and treatment.

Liver clear cell foci and viral infection are associated with non-cirrhotic, non-fibrolamellar hepatocellular carcinoma in young patients from South America.

We previously described a divergent clinical and molecular presentation of hepatocellular carcinoma (HCC) in Peru. The present study aimed to further characterize the tissue features associated with this singular nosological form of HCC in order to gain insight into the natural history of the disease. We performed an exploratory analysis of the histology of both tumor and non-tumor liver (NTL) tissues from 50 Peruvian HCC patients, and compared with that of 75 individuals with non-HCC liver tumor or benign liver lesions as a baseline for NTL features. We complemented this approach with a transcriptome analysis in a subset of NTL tissue samples and also performed an ultra-sensitive hepatitis B virus (HBV) detection in liver tissues of the patients. Overall, results highlighted the low rate of liver parenchymal alterations in a young patient cohort (median age: 40 years old), despite a strong prevalence of underlying HBV infection (c. 67%). Withal, liver clear cell foci of cellular alteration were genuinely associated with HCC and appended to some changes in immune and G protein-coupled receptor gene expression ontologies. Our findings confirm the occurrence of a particular setting of HCC in South America, a region where the pathophysiology of liver cancer remains largely unexplored.

Early-onset liver cancer in South America associates with low hepatitis B virus DNA burden.

In Peru, hepatocellular carcinoma (HCC) arises in young non-cirrhotic patients. Hepatitis B virus (HBV) is suspected to be the prominent etiological agent. We thus performed a comprehensive molecular study of HBV infection in 65 Peruvian HCC patients. Only 51% were considered as persistently infected at the onset. HBV DNA was found by PCR in the tumor and/or matched non-tumor liver tissues in more than 80% of cases (n = 53/65). HBV DNA was significantly more abundant in livers of younger patients than in those of the older ones. We consistently observed low viral DNA burden (0.1-6.5 copies for 100 cells), with viral genomes in younger patients displaying higher proportion of mutations at di-pyrimidines (TpT and CpC, P = 0.006). A drastic activation of multiple DNA repair pathways in tumors of younger patients was observed. Our observations clearly challenge the current vision that associates high HBV DNA load with earlier tumor development. We concluded that in Peru, and maybe in other populations with Americas' indigenous ancestry, HBV-associated liver tumorigenesis might differ significantly from that generally observed in the rest of the world. Procedures used to screen for HCC development in subjects at risk should be adapted to the local situation.

Impact of pathological features of brain metastases in prognosis.

AIM: To evaluate the prognostic value of tumor-infiltrating lymphocytes (TILs) and Ki67 in brain metastasis lesions, and the effect of adding them to variables of graded prognostic assessment score. PATIENTS & METHODS: Clinicopathological information from 111 medical charts of brain metastasis patients was obtained, and TIL distribution (n = 84), Ki67 index (n = 79) and CD3 TIL (n = 64) were prospectively evaluated. RESULTS: Most frequent TIL pattern was perivascular (67.8%), and median Ki67 and CD3 TIL percents were 30 and 4.8%, respectively. Ki67 ≥15 was associated with shorter survival (p = 0.018) but CD3 TIL was not (p = 0.870). The highest graded prognostic assessment score was not associated with survival (p = 0.648), however, those with low Ki67 and high score was associated with better outcome (p = 0.007). CONCLUSION: High Ki67 index in brain metastasis carries a worse prognosis.

MGMT promoter methylation in Peruvian patients with glioblastoma.

PURPOSE: O6-methylguanine-DNA methyltransferase (MGMT) promoter methylation predicts the outcome and response to alkylating chemotherapy in glioblastoma. The aim of this study is to evaluate the prevalence of MGMT methylation in Peruvian glioblastoma cases. PATIENTS AND METHODS: We evaluated retrospectively 50 cases of resected glioblastoma during the period 2008-2013 at Instituto Nacional de Enfermedades Neoplasicas in Peru. Samples consisted of paraffin embedded and frozen tumour tissue. MGMT-promoter methylation status and the expression level of MGMT gene were evaluated by methylation-specific PCR and real-time PCR, respectively. RESULTS: Unmethylated, methylated and partially methylated statuses were found in 54%, 20% and 26% of paraffin-embedded samples, respectively. Methylation status was confirmed in the Virgen de la Salud Hospital and frozen samples. There was an association between the status of MGMT-promoter methylation and the level of gene expression (p = 0.001). Methylation was associated with increased progression-free survival (p = 0.002) and overall survival (OS) (p < 0.001). CONCLUSION: MGMT-promoter methylation frequency in Peruvian glioblastoma is similar to that reported in other populations and the detection test has been standardised.

Glioblastoma of pineal region: report of four cases and literature review.

We report four cases of glioblastoma in the pineal region. The patients presented a severe headache and vomiting. Brain imaging showed a heterogeneously enhanced tumor in the pineal region with obstructive hydrocephalus. Case 3 developed a subependymal dissemination. The patient went to ventricular-peritoneal shunt and subtotal or total resection and radiotherapy with/without chemotherapy. Cases 1 and 2 received radiation and died 8 and 11 later months. Cases 3 and 4 completed radiotherapy and chemotherapy, and survived 28 and 31 months after the initial diagnosis. Glioblastoma in the pineal region carry a poor prognosis and require neurooncology teams.

Tumor infiltrating lymphocytes in triple negative breast cancer receiving neoadjuvant chemotherapy.

AIM: To determine influence of neoadjuvant-chemotherapy (NAC) over tumor-infiltrating-lymphocytes (TIL) in triple-negative-breast-cancer (TNBC). METHODS: TILs were evaluated in 98 TNBC cases who came to Instituto Nacional de Enfermedades Neoplasicas from 2005 to 2010. Immunohistochemistry staining for CD3, CD4, CD8 and FOXP3 was performed in tissue microarrays (TMA) sections. Evaluation of H/E in full-face and immunohistochemistry in TMA sections was performed in pre and post-NAC samples. STATA software was used and P value < 0.05 was considered statistically significant. RESULTS: Higher TIL evaluated in full-face sections from pre-NAC tumors was associated to pathologic-complete-response (pCR) (P = 0.0251) and outcome (P = 0.0334). TIL evaluated in TMA sections showed low level of agreement with full-face sections (ICC = 0.017-0.20) and was not associated to pCR or outcome. TIL in post-NAC samples were not associated to response or outcome. Post-NAC lesions with pCR had similar TIL levels than those without pCR (P = 0.6331). NAC produced a TIL decrease in full-face sections (P < 0.0001). Percentage of TIL subpopulations was correlated with their absolute counts. Higher counts of CD3, CD4, CD8 and FOXP3 in pre-NAC samples had longer disease-free-survival (DFS). Higher counts of CD3 in pre-NAC samples had longer overall-survival. Higher ratio of CD8/CD4 counts in pre-NAC was associated with pCR. Higher ratio of CD4/FOXP3 counts in pre-NAC was associated with longer DFS. Higher counts of CD4 in post-NAC samples were associated with pCR. CONCLUSION: TIL in pre-NAC full-face sections in TNBC are correlated to longer survival. TIL in full-face differ from TMA sections, absolute count and percentage analysis of TIL subpopulation closely related.

Interobserver Agreement Between Pathologists Assessing Tumor-Infiltrating Lymphocytes (TILs) in Breast Cancer Using Methodology Proposed by the International TILs Working Group.

BACKGROUND: The presence of tumor-infiltrating lymphocytes (TILs) in breast tumors is prognostic and predictive, suggesting that TILs may be an important biomarker. Recently, an international TILs working group formulated consensus recommendations for TIL evaluation. The current study was performed to determine interobserver agreement using that methodology. METHODS: Tumor-infiltrating lymphocytes were assessed on a single hematoxylin and eosin (H&E)-stained slide obtained from the core biopsy of 75 triple-negative breast cancers. Four pathologists independently reviewed each slide and evaluated stromal TILs (sTILs) and intratumoral TIL (iTILs). The kappa statistic was used to estimate interobserver agreement for identification of sTILs, and the intraclass correlation coefficient (ICC) was used to estimate the agreement among observers for iTILs. Cases with poor agreement were reviewed to identify pathologic factors that may contribute to the lack of agreement. RESULTS: The kappa statistic for sTIL evaluation was 0.57 (standard error, 0.04). For iTILs, the ICC calculated to determine internal consistency within raters was 0.65 (95 % confidence interval [CI] 0.56-0.74; p < 0.0001), and the ICC calculated to determine agreement among raters was 0.62 (95 % CI 0.50-0.72; p < 0.0001). In 10 cases (13 %), there was not agreement between three of four pathologists. The pathologic features contributing to difficulty in TIL enumeration included marked individual tumor cell necrosis or apoptosis, the presence of reactive plasma cells mimicking tumor cells, plasmatoid tumor cells, and accurate quantification of TILs in specimens with focal areas of heavy immune infiltrate. CONCLUSION: Acceptable agreement in TIL enumeration was observed, suggesting that the proposed methodology can be used to facilitate the use of TILs as a biomarker in research and clinical trial settings.

Astrocitoma pilocítico en niños: Reporte de un caso / Pilocytic astrocytoma in children. Case Report

Se reporta el caso de un niño de 10 años que se presentó con dos semanas de enfermedad caracterizada por cefalea, vómitos, marcha tambaleante y somnolencia. El examen clínico reveló bradilalia, ataxia, hiperreflexia, nistagmo horizontal y vertical, parálisis del VI nervio craneal izquierdo y signos de frontalización. En la tomografía y resonancia cerebrales se encontró hidrocefalia obstructiva por un tumor de la fosa posterior. La anatomía patológica reveló Astrocitoma Pilocítico grado I (WHO)...

We report a 10 years old boy with 2 weeks of symptoms characterized by headache, vomiting, staggering gait and drowsiness. The initial clinical examination showed bradilalia, ataxia, hyperreflexia, horizontal and vertical nystagmus, VI left cranial nerve paresis and signs of frontalization. The brain CT and MRI showed a posterior fossa tumor causing hydrocephaly. The histhopatology revealed grade I pilocytic astrocytoma (WHO)...

[Microsurgical resection of glioblastoma guided with intraoperative fluorescein: a Retrospective evaluation]. / Resección microquirúrgica de glioblastoma guiada con fluoresceína intraoperatoria: evaluación retrospectiva.

OBJECTIVES: To evaluate the influence of the use of sodium fluorescein (FLS-Na) in surgery of glioblastoma (GB) on the degree of tumor resection and survival in patients treated at the National Institute of Neoplastic Diseases. MATERIALS AND METHODS: A total of 238 cases of GB treated between 2008 and 2013 were reviewed and 150 cases of GB who underwent surgical resection with clinicopathological information and adequate follow-up were selected. RESULTS: The mean age was 51 years, 58.7% of the cases presented a Karnofsky score of at least 90. FLS-Na was administered in 80 cases (53.3%) and a subtotal and total resection was obtained in 69 (46%) and 81 (54%) cases, respectively. The group that received FLS-Na obtained higher rates of total resection than the group operated with white light alone (77.5 vs 27.1%, p<0.001). The median overall survival (OS) was higher in the group subject to total compared to subtotal resection (17 vs 7 months, p<0.001). The median OS in those who received FLS-Na was higher than in those who did not (15.0 vs 8 months, p=0.003). Other factors affecting OS were age (p=0.002), the Karnofsky score (p=0.052) and radiation therapy (p=0.016) and chemotherapy (p=0.011). CONCLUSIONS: The microsurgical technique with administration of FLS-Na was associated with an increase in the rate of total resection and survival.

[Amebiasis of the central nervous system: report of six cases in Peru]. / Amebiasis del sistema nervioso central: reporte de seis casos en el Perú.

Six cases of amoebic encephalitis admitted to the National Institute of Neoplastic Diseases between the years 1994-2010 in Peru are reported. These cases were admitted for clinical suspicion of malignant primary brain tumor and one orbital-nasal sarcoma. All cases came from coastal regions; three were less than 24 years of age and four were male. The most common symptoms were headache and seizures. Three cases had more than one brain lesion. Stereotactic biopsy was performed in three patients and the differential pathological diagnosis in two cases was glioma of high and low grade. It was possible to confirm the diagnosis using molecular techniques in paraffin-embedded samples in three cases. All patients died within 15 days of admission to the institution. Amoebic encephalitis may be erroneously interpreted as a cerebral neoplasm, causing delay in the management of the infection.

[Glioblastoma: Molecular analysis and its clinical implications]. / Glioblastoma: Análisis molecular y sus implicancias clínicas.

Glioblastoma (GB) is the most common and most lethal primary brain tumor. Epidemiologic information indicate that its incidence is lower in Hispanic race. Surgery is the only curative strategy and has recently introduced new strategies that increase resection rates. The use of concurrent chemotherapy with radiotherapy improves survival of patients but is associated with toxicity. Improved understanding of molecular biology of GB allows the identification of predictive biomarkers of response and prognosis as well as therapeutic targets for the development of new therapeutic strategies. Among biomarkers are currently available 1p /19q codeletion, IDH mutation and O6-methylguanine DNAmethyltransferase promoter methylation. The identification therapeutic targets enables the development of new drugs and their evaluation in clinical trials, but none has been prospectively validated in phase III clinical trials.

Resección microquirúrgica de glioblastoma guiada con fluoresceína intraoperatoria: evaluación retrospectiva / Microsurgical resection of glioblastoma guided with intraoperative fluorescein: a retrospective evaluation

Evaluar la influencia del uso de fluoresceína sódica (FLS-Na) en la cirugía del glioblastoma (GB) sobre el grado de resección tumoral y la supervivencia en pacientes atendidos en el Instituto Nacional de Enfermedades Neoplásicas. Materiales y métodos. Se revisó un total de 238 casos de GB atendidos entre los años 2008 y 2013 y se seleccionó 150 casos de GB sometidos a resección quirúrgica, con información clínico-patológica y seguimiento adecuado. Resultados. La media de edad fue 51 años, el 58,7% de casos presento Karnofsky de al menos 90. Se administró FLS-Na en 80 casos (53,3%) y se obtuvo una resección subtotal y total en 69 (46%) y 81 (54%) de los casos, respectivamente. El grupo que recibió FLS-Na obtuvo mayores tasas de resección total que el grupo operado solo con luz blanca (77,5 vs 27,1%, p<0,001). La mediana de sobrevida global (SG) fue mayor en el grupo sometido a resección total que a subtotal (17 vs 7 meses, p<0,001). La mediana de SG en los que recibieron FLS-Na fue mayor que en los que no la recibieron (15,0 vs 8 meses, p=0,003). Otros factores que afectaron la SG fueron la edad (p=0,002), el Karnofsky (p=0,052) y la administración de radioterapia (p=0,016) y quimioterapia (p=0,011). Conclusiones. La técnica microquirúrgica con administración de FLS-Na se asoció con un aumento en la tasa de resecciones totales y de supervivencia...

To evaluate the influence of the use of sodium fluorescein (FLS-Na) in surgery of glioblastoma (GB) on the degree of tumor resection and survival in patients treated at the National Institute of Neoplastic Diseases. Materials and methods. A total of 238 cases of GB treated between 2008 and 2013 were reviewed and 150 cases of GB who underwent surgical resection with clinicopathological information and adequate follow-up were selected. Results. The mean age was 51 years, 58.7% of the cases presented a Karnofsky score of at least 90. FLS-Na was administered in 80 cases (53.3%) and a subtotal and total resection was obtained in 69 (46%) and 81 (54%) cases, respectively. The group that received FLS-Na obtained higher rates of total resection than the group operated with white light alone (77.5 vs 27.1%, p<0.001). The median overall survival (OS) was higher in the group subject to total compared to subtotal resection (17 vs 7 months, p<0.001). The median OS in those who received FLS-Na was higher than in those who did not (15.0 vs 8 months, p=0.003). Other factors affecting OS were age (p=0.002), the Karnofsky score (p=0.052) and radiation therapy (p=0.016) and chemotherapy (p=0.011). Conclusions. The microsurgical technique with administration of FLS-Na was associated with an increase in the rate of total resection and survival...

Amebiasis del sistema nervioso central: reporte de seis casos en el Perú / Amebiasis of the central nervous system: report of six cases in Peru

Se reportan seis casos de encefalitis amebiana admitidos en el Instituto Nacional de Enfermedades Neoplásicas entre los años 1994-2010 en Perú; estos casos ingresaron por sospecha clínica de tumor cerebral primario maligno y uno como sarcoma orbito-nasal. Todos los casos provenían de departamentos costeros; tres tenían menos de 24 años de edad y cuatro de sexo masculino. Los síntomas más frecuentes fueron cefalea y convulsiones. Tres casos presentaron más de una lesión cerebral. Se realizó biopsia por estereotaxia en tres pacientes y el diagnóstico anatomopatológico diferencial, en dos casos, fue glioma de alto y bajo grado. Se logró confirmar el diagnóstico mediante técnicas moleculares en muestras parafinadas en tres casos. Todos los pacientes fallecieron en menos de 15 días desde su ingreso al instituto. La encefalitis amebiana puede ser erradamente interpretada como una neoplasia cerebral, ocasionando retraso en el manejo del cuadro infeccioso...

Six cases of amoebic encephalitis admitted to the National Institute of Neoplastic Diseases between the years 1994-2010 in Peru are reported. These cases were admitted for clinical suspicion of malignant primary brain tumor and one orbital-nasal sarcoma. All cases came from coastal regions; three were less than 24 years of age and four were male. The most common symptoms were headache and seizures. Three cases had more than one brain lesion. Stereotactic biopsy was performed in three patients and the differential pathological diagnosis in two cases was glioma of high and low grade. It was possible to confirm the diagnosis using molecular techniques in paraffin-embedded samples in three cases. All patients died within 15 days of admission to the institution. Amoebic encephalitis may be erroneously interpreted as a cerebral neoplasm, causing delay in the management of the infection...

Glioblastoma: análisis molecular y sus implicancias clínicas / Glioblastoma: molecular analysis and its clinical implications

El glioblastoma multiforme (GB) es el tumor cerebral primario del sistema nervioso central (SNC) más frecuente y más letal en la edad adulta. La evidencia epidemiológica indica que su incidencia es menor en la raza hispana. El tratamiento quirúrgico es la opción terapéutica preferente. Recientemente se han introducido nuevas estrategias que incrementan el volumen de resección. El uso de quimioterapia y radioterapia concurrentes mejora la supervivencia de los pacientes, aunque se asocia a toxicidad. La mejora en la comprensión de la biología molecular del GB ha permitido la identificación de biomarcadores predictivos de respuesta terapéutica y pronóstico, así como la identificación de dianas terapéuticas que han permitido el desarrollo de nuevas estrategias en el tratamiento de estos tumores. Entre los biomarcadores actualmente disponibles se encuentran la codelección 1p/19q, la mutación de IDH y la metilación del promotor O6- metilguanina DNA-metiltransferasa. La identificación de dianas terapéuticas permite el desarrollo de nuevas drogas y su evaluación posterior en ensayos clínicos, aunque ninguna de ellas ha sido validada prospectivamente en ensayos clínicos de fase III.

Glioblastoma (GB) is the most common and most lethal primary brain tumor. Epidemiologic information indicate that its incidence is lower in Hispanic race. Surgery is the only curative strategy and has recently introduced new strategies that increase resection rates. The use of concurrent chemotherapy with radiotherapy improves survival of patients but is associated with toxicity. Improved understanding of molecular biology of GB allows the identification of predictive biomarkers of response and prognosis as well as therapeutic targets for the development of new therapeutic strategies. Among biomarkers are currently available 1p /19q codeletion, IDH mutation and O6-methylguanine DNAmethyltransferase promoter methylation. The identification therapeutic targets enables the development of new drugs and their evaluation in clinical trials, but none has been prospectively validated in phase III clinical trials.