RESUMEN
The importance of molecular testing of gliomas is highlighted in the 2016 revised 4th edition of the WHO Classification of Tumours of the Central Nervous System, which applies an integrated diagnosis of histological and molecular features. In this classification system, oligodendrogliomas (ODG) are defined as IDH-mutant and 1p/19q-codeleted. Fluorescence in situ hybridization (FISH) analysis of formalin-fixed paraffin-embedded (FFPE) tissue is a standard method of determining 1p/19q-codeletion. However, it has several disadvantages, including requiring lengthy pretreatment, truncation artefact and lack of on-site access in many centers. In an effort to address these issues, we analysed FISH performed on smears obtained at intraoperative frozen section on 51 gliomas and compared this to FISH performed on subsequent FFPE sections. Four cases were excluded due to uninterpretable FISH results. Of the remaining 47 cases, 17 were concordant for 1p/19q-codeletion, 29 were concordant for lack of 1p/19q-codeletion, and 1 was discordant with 1p/19q-codeletion found on FFPE tissue but not on intraoperative smears. The discordant case was most likely due to sampling error, as the frozen section had not shown definite tumor. The FISH results on intraoperative smears were received within 24-48 h after the sample was collected, compared with 3-4 days for FFPE tissue. FISH on smears obtained at intraoperative frozen section is an accurate and fast method for determining 1p/19q-codeletion.
Asunto(s)
Neoplasias Encefálicas , Glioma , Encéfalo , Neoplasias Encefálicas/diagnóstico , Neoplasias Encefálicas/genética , Neoplasias Encefálicas/cirugía , Glioma/diagnóstico , Glioma/genética , Glioma/cirugía , Humanos , Hibridación Fluorescente in Situ , Isocitrato DeshidrogenasaRESUMEN
This study compared breast cancer survival and the prognostic factors across different age groups of women in Penang, Malaysia. Data on 2,166 women with breast cancer who had been diagnosed between 2010 and 2014 were extracted from the Penang Breast Cancer Registry and stratified into 3 age groups: young (< 40 years old), middle-aged (40-59 years old), and elderly (≥ 60 years). The overall and relative survival rates were calculated using the life table method, median survival time was calculated using the Kaplan-Meier method, and comparisons between groups were conducted using the log-rank test. Prognostic factors were analyzed using a Cox proportional hazards model. The 5-year overall and breast cancer-specific survival rates for women with breast cancer in Penang were 72.9% and 75.2%, with a mean survival time of 92.5 months and 95.1 months, respectively. The 5-year breast cancer-specific survival rates for young, middle-aged, and elderly women were 74.9%, 77.8%, and 71.4%, respectively, with a mean survival time of 95.7 months, 97.5 months, and 91.2 months. There was a significant difference in breast cancer survival between age groups, with elderly women showing the lowest survival rate, followed by young and middle-aged women. Disease stage was the most prominent prognostic factor for all age groups. Survival rates and prognostic factors differed according to age group. Treatment planning for breast cancer patients should be age-specific to promote better cancer care and survival.
Asunto(s)
Neoplasias de la Mama/mortalidad , Neoplasias de la Mama/terapia , Supervivientes de Cáncer/estadística & datos numéricos , Adulto , Distribución por Edad , Anciano , Anciano de 80 o más Años , Neoplasias de la Mama/patología , Bases de Datos Factuales , Femenino , Humanos , Malasia/epidemiología , Persona de Mediana Edad , Estadificación de Neoplasias , Pronóstico , Tasa de Supervivencia , Adulto JovenAsunto(s)
Neoplasias del Sistema Nervioso Central/genética , Linfoma de Células B Grandes Difuso/genética , Neoplasias Testiculares/genética , Anciano , Neoplasias del Sistema Nervioso Central/secundario , Reordenamiento Génico , Humanos , Linfoma de Células B Grandes Difuso/patología , Masculino , Persona de Mediana Edad , Mutación , Neoplasias Testiculares/patologíaRESUMEN
The objective of this study was to evaluate the distribution and prognostic impact of a broad range of molecular attributes in a large cohort of immunocompetent patients with primary central nervous system lymphoma (PCNSL) by using tissue microarray. Patients diagnosed with PCNSL were initially identified in the BC Cancer Lymphoid Cancer clinical and pathology databases. Tissue microarrays were constructed by using archival formalin-fixed paraffin-embedded diagnostic biopsy tissue. Immunohistochemistry and fluorescent in situ hybridization studies were performed. A total of 115 patients with PCNSL with diffuse large B-cell lymphoma (DLBCL) histology were identified. The majority of cases (≥75%) had a non-germinal center B-cell phenotype according to immunohistochemistry algorithms, but cell of origin did not affect progression-free or overall survival. MYC (40%), BCL2 (75%), and programmed death-ligand 1 (29%) protein expression were common, but their corresponding gene rearrangements were rare (≤1% each), suggesting that alternate mechanisms were driving expression. There were no dual rearrangements involving MYC and BCL2. Only 22% of cases had membranous expression of major histocompatibility complex class II, suggesting a mechanism for escape from immune surveillance. Epstein-Barr virus-encoded RNA was positive in 1 immunocompetent patient. BCL6 protein expression (77%) and BCL6 rearrangements (31%) were frequent; the latter was the only factor associated with a poor prognosis in the overall cohort and in the subgroup of 52 patients treated with high-dose methotrexate-based regimens. This large population-based study shows that prominent molecular features of PCNSL are unique and different from those of systemic DLBCL. These results may better inform drug development in PCNSL.
Asunto(s)
Linfoma no Hodgkin/fisiopatología , Estudios de Cohortes , Humanos , Análisis de Matrices TisularesRESUMEN
OBJECTIVE: Treatment options are limited for patients with recurrent/metastatic low-grade ovarian cancers (LGOCs) and serous borderline ovarian tumors (SBOTs) as response rates to chemotherapy are low. A subset of patients appears to derive clinical benefit from antiestrogens, but most studies have been retrospective and clinical benefit rates (CBR) remain uncertain. The primary aim of PARAGON was to prospectively investigate the CBR of anastrozole, an aromatase inhibitor, in patients with estrogen receptor (ER) and/or progesterone receptor (PR) positive LGOC and SBOT. METHODS: Post-menopausal women with ER-positive and/or PR-positive recurrent/metastatic LGOCs and SBOTs and evaluable disease by RECIST v1.1 or GCIG CA125 criteria were treated with anastrozole 1â¯mg daily until progression or unacceptable toxicity. RESULTS: Thirty-six patients were enrolled. Clinical benefit at 3â¯months (primary endpoint) was observed in 23 patients (64%, 95% CI 48%-78%) and was similar at 6â¯months (61%, 95% CI 43%-75%). The median duration of clinical benefit was 9.5â¯months (95% CI 8.3-25.8). Best study response was partial response by RECIST in 5 patients (14%), stable disease in 18 patients (50%) with progressive disease in 13 patients (36%). Median PFS was 11.1â¯months (95% CI 3.2-11.9). Anastrozole was well-tolerated. Patients with evidence of clinical benefit at 3â¯months reported less pain, fatigue, and improved physical and role functioning as early as 1â¯month of commencing treatment. CONCLUSIONS: Anastrozole was associated with a CBR of 61% of patients with recurrent ER-positive and/or PR-positive LGOC or SBOT for at least 6â¯months with acceptable toxicity.
Asunto(s)
Anastrozol/uso terapéutico , Carcinoma Epitelial de Ovario/tratamiento farmacológico , Cistadenocarcinoma Seroso/tratamiento farmacológico , Neoplasias Ováricas/tratamiento farmacológico , Receptores de Estrógenos/metabolismo , Adulto , Anciano , Anastrozol/efectos adversos , Antineoplásicos Hormonales/efectos adversos , Antineoplásicos Hormonales/uso terapéutico , Carcinoma Epitelial de Ovario/metabolismo , Carcinoma Epitelial de Ovario/patología , Cistadenocarcinoma Seroso/metabolismo , Cistadenocarcinoma Seroso/patología , Femenino , Humanos , Persona de Mediana Edad , Clasificación del Tumor , Recurrencia Local de Neoplasia/tratamiento farmacológico , Recurrencia Local de Neoplasia/metabolismo , Recurrencia Local de Neoplasia/patología , Neoplasias Ováricas/metabolismo , Neoplasias Ováricas/patología , Posmenopausia , Supervivencia sin Progresión , Estudios Prospectivos , Calidad de Vida , Receptores de Progesterona/metabolismo , Adulto JovenRESUMEN
Marchiafava-Bignami disease (MBD) is a rare condition often associated with chronic alcohol abuse. Clinical presentation is diverse. Characteristic magnetic resonance imaging (MRI) changes in the corpus callosum are the mainstay of radiological diagnosis. We present a case of a 54-year-old man with chronic alcoholism and peripherally enhancing lesion in the body of the corpus callosum on MRI Brain. Open biopsy of the lesion showed necrosis and demyelination. He was diagnosed with Marchiafava-Bignami disease based on clinical, radiology and histopathology findings. Our case represents the only case in the literature with antemortem histopathology findings describing MBD.
Asunto(s)
Cuerpo Calloso/diagnóstico por imagen , Cuerpo Calloso/patología , Imagen por Resonancia Magnética/métodos , Enfermedad de Marchiafava-Bignami/diagnóstico por imagen , Enfermedad de Marchiafava-Bignami/patología , Alcoholismo/diagnóstico por imagen , Alcoholismo/patología , Diagnóstico , Humanos , Masculino , Persona de Mediana EdadRESUMEN
The addition of rituximab has improved outcomes in diffuse large B-cell lymphoma (DLBCL), however, there remains limited information on the impact of rituximab in those with testicular involvement. All patients with diffuse large cell lymphoma and testicular involvement treated with curative intent were identified in the British Columbia Cancer Agency Lymphoid Cancer Database. In total, 134 patients diagnosed between 1982 and 2015 with diffuse large cell lymphoma involving the testis were identified: 61 received CHOP (cyclophosphamide, doxorubicin, vincristine, prednisone)-like chemotherapy and 73 received CHOP plus rituximab (R-CHOP). A greater proportion of R-CHOP treated patients had higher International Prognostic Index (IPI, P = 0·005). In multivariate analysis, the protective effect of rituximab on progression-free survival (hazard ratio (HR) 0·42, P < 0·001), overall survival (HR 0·39, P < 0·001) and cumulative incidence of progression (HR 0·46, P = 0·014) were independent of the IPI. However, in a competing risk multivariate analysis including central nervous system (CNS) prophylaxis and the CNS-IPI, rituximab was not associated with a decreased risk of CNS relapse. The addition of rituximab has reduced the risk of lymphoma recurrence in testicular DLBCL, presumably through improved eradication of systemic disease. However, CNS relapse risk remains high and further studies evaluating effective prophylactic strategies are needed.
Asunto(s)
Linfoma de Células B Grandes Difuso/patología , Rituximab/uso terapéutico , Neoplasias Testiculares/patología , Adulto , Anciano , Anciano de 80 o más Años , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Colombia Británica , Neoplasias del Sistema Nervioso Central/prevención & control , Neoplasias del Sistema Nervioso Central/secundario , Ciclofosfamida/uso terapéutico , Bases de Datos Factuales , Supervivencia sin Enfermedad , Doxorrubicina/uso terapéutico , Humanos , Incidencia , Masculino , Persona de Mediana Edad , Profilaxis Pre-Exposición/tendencias , Prednisona/uso terapéutico , Pronóstico , Recurrencia , Riesgo , Rituximab/farmacología , Tasa de Supervivencia , Resultado del Tratamiento , Vincristina/uso terapéuticoAsunto(s)
Citoplasma/metabolismo , Antígenos de Histocompatibilidad Clase II/inmunología , Linfoma de Células B Grandes Difuso/diagnóstico , Linfoma de Células B Grandes Difuso/inmunología , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Anticuerpos Monoclonales de Origen Murino/uso terapéutico , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Supervivencia sin Enfermedad , Femenino , Humanos , Linfoma de Células B Grandes Difuso/metabolismo , Linfoma de Células B Grandes Difuso/patología , Masculino , Persona de Mediana Edad , Pronóstico , Adulto JovenRESUMEN
BACKGROUND: Follicular lymphoma (FL) is an indolent, yet incurable B cell malignancy. A subset of patients experience an increased mortality rate driven by two distinct clinical end points: histological transformation and early progression after immunochemotherapy. The nature of tumor clonal dynamics leading to these clinical end points is poorly understood, and previously determined genetic alterations do not explain the majority of transformed cases or accurately predict early progressive disease. We contend that detailed knowledge of the expansion patterns of specific cell populations plus their associated mutations would provide insight into therapeutic strategies and disease biology over the time course of FL clinical histories. METHODS AND FINDINGS: Using a combination of whole genome sequencing, targeted deep sequencing, and digital droplet PCR on matched diagnostic and relapse specimens, we deciphered the constituent clonal populations in 15 transformation cases and 6 progression cases, and measured the change in clonal population abundance over time. We observed widely divergent patterns of clonal dynamics in transformed cases relative to progressed cases. Transformation specimens were generally composed of clones that were rare or absent in diagnostic specimens, consistent with dramatic clonal expansions that came to dominate the transformation specimens. This pattern was independent of time to transformation and treatment modality. By contrast, early progression specimens were composed of clones that were already present in the diagnostic specimens and exhibited only moderate clonal dynamics, even in the presence of immunochemotherapy. Analysis of somatic mutations impacting 94 genes was undertaken in an extension cohort consisting of 395 samples from 277 patients in order to decipher disrupted biology in the two clinical end points. We found 12 genes that were more commonly mutated in transformed samples than in the preceding FL tumors, including TP53, B2M, CCND3, GNA13, S1PR2, and P2RY8. Moreover, ten genes were more commonly mutated in diagnostic specimens of patients with early progression, including TP53, BTG1, MKI67, and XBP1. CONCLUSIONS: Our results illuminate contrasting modes of evolution shaping the clinical histories of transformation and progression. They have implications for interpretation of evolutionary dynamics in the context of treatment-induced selective pressures, and indicate that transformation and progression will require different clinical management strategies.
Asunto(s)
Evolución Clonal , Progresión de la Enfermedad , Linfoma Folicular/fisiopatología , Células Clonales , Humanos , Linfoma Folicular/genética , MutaciónRESUMEN
Dual expression of MYC and BCL2 by immunohistochemistry (IHC) is associated with poor outcome in diffuse large B-cell lymphoma (DLBCL). Dual translocation of MYC and BCL2, so-called "double-hit lymphoma," has been associated with a high risk of central nervous system (CNS) relapse; however, the impact of dual expression of MYC and BCL2 (dual expressers) on the risk of CNS relapse remains unknown. Pretreatment formalin-fixed paraffin-embedded DLBCL biopsies derived from patients subsequently treated with rituximab plus cyclophosphamide, doxorubicin, vincristine, and prednisone (R-CHOP) were assembled on tissue microarrays from 2 studies and were evaluated for expression of MYC and BCL2 by IHC. In addition, cell of origin was determined by IHC and the Lymph2Cx gene expression assay in a subset of patients. We identified 428 patients who met the inclusion criteria. By the recently described CNS risk score (CNS-International Prognostic Index [CNS-IPI]), 34% were low risk (0 to 1), 45% were intermediate risk (2 to 3), and 21% were high risk (4 or greater). With a median follow-up of 6.8 years, the risk of CNS relapse was higher in dual expressers compared with non-dual expressers (2-year risk, 9.7% vs 2.2%; P = .001). Patients with activated B-cell or non-germinal center B-cell type DLBCL also had an increased risk of CNS relapse. However, in multivariate analysis, only dual expresser status and CNS-IPI were associated with CNS relapse. Dual expresser MYC(+) BCL2(+) DLBCL defines a group at high risk of CNS relapse, independent of CNS-IPI score and cell of origin. Dual expresser status may help to identify a high-risk group who should undergo CNS-directed evaluation and consideration of prophylactic strategies.
Asunto(s)
Biomarcadores de Tumor/análisis , Sistema Nervioso Central/patología , Linfoma de Células B Grandes Difuso/química , Proteínas Proto-Oncogénicas c-bcl-2/análisis , Proteínas Proto-Oncogénicas c-myc/análisis , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Protocolos de Quimioterapia Combinada Antineoplásica/administración & dosificación , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Linaje de la Célula , Ciclofosfamida/administración & dosificación , Citarabina/administración & dosificación , Doxorrubicina/administración & dosificación , Femenino , Estudios de Seguimiento , Humanos , Linfoma de Células B Grandes Difuso/tratamiento farmacológico , Linfoma de Células B Grandes Difuso/patología , Masculino , Metotrexato/administración & dosificación , Persona de Mediana Edad , Análisis Multivariante , Prednisona/administración & dosificación , Modelos de Riesgos Proporcionales , Recurrencia , Riesgo , Rituximab/administración & dosificación , Análisis de Matrices Tisulares , Translocación Genética , Resultado del Tratamiento , Vincristina/administración & dosificación , Adulto JovenRESUMEN
Purpose This study aims to determine the life satisfaction and strain on informal caregivers when caring for traumatic brain injury (TBI) patients and to examine the factors predicting the level of strain among the informal caregivers. Method A cross-sectional survey on a purposive sampling was performed in a single centre in Malaysia recruiting caregivers of patients with TBI. Life Satisfaction Questionnaire-9 and Caregiver Strain Index questionnaires were used to ascertain the life satisfaction and strain of caregivers respectively. Relationship between life satisfaction and strain was analysed, together with factors significantly associated with strain. Results A total of 141 caregivers (77.3% women, average age of 46.1 years ±12.8 and mean duration of caregiving of 24.8 months ± 14.3) were included in the analysis. Most caregivers (75%) were satisfied with their lives but more than half claimed to have strain (57%). There was a significant relationship between life satisfaction and strain among the caregivers (p < 0.001). From a multiple linear regression analysis, a caregiver's monthly income of less than RM3000 (OR 6.48, 95% CI 1.48-28.40, p = 0.04), presence of patient's neurobehavioural disturbances (OR 4.48, 95% CI 1.60-12.55, p = 0.004) and cognitive dysfunctions (OR 31.72, 95% CI 10.27-97.96, p < 0.001) were significant predictors of caregiver's strain. Conclusion Caregivers with lower monthly income and caring for TBI patients with cognitive and neurobehavioural disturbances are at higher risk of developing strain. Rehabilitation interventions post-discharge should aim at supporting the caregivers at risk. Implications for Rehabilitation Informal caregivers of patients with traumatic brain injury who are not satisfied with their lives are most likely experiencing strain. Caregivers in Malaysia who are at high risk of experiencing strain are those with lower monthly income and care for patients with significant cognitive and neurobehavioural disturbances. Efforts to reduce strain in caregivers at risk should be included in the post-discharge rehabilitation programme in Malaysia.
RESUMEN
Follicular lymphoma (FL) is an indolent disease but transforms in 2% to 3% of patients per year into aggressive, large cell lymphoma, a critical event in the course of the disease associated with increased lymphoma-related mortality. Early transformation cannot be accurately predicted at the time of FL diagnosis and the biology of transformed FL (TFL) is poorly understood. Here, we assembled a cohort of 126 diagnostic FL specimens including 40 patients experiencing transformation (<5 years) and 86 patients not experiencing transformation for at least 5 years. In addition, we assembled an overlapping cohort of 155 TFL patients, including 114 cases for which paired samples were available, and assessed temporal changes of routinely available biomarkers, outcome after transformation, as well as molecular subtypes of TFL. We report that the expression of IRF4 is an independent predictor of early transformation (Hazard ratio, 13.3; P < .001). We also show that composite histology at the time of transformation predicts favorable prognosis. Moreover, applying the Lymph2Cx digital gene expression assay for diffuse large B-cell lymphoma (DLBCL) cell-of-origin determination to 110 patients with DLBCL-like TFL, we demonstrate that TFL is of the germinal-center B-cell-like subtype in the majority of cases (80%) but that a significant proportion of cases is of the activated B-cell-like (ABC) subtype (16%). These latter cases are commonly negative for BCL2 translocation and arise preferentially from BCL2 translocation-negative and/or IRF4-expressing FLs. Our study demonstrates the existence of molecular heterogeneity in TFL as well as its relationship to the antecedent FL.
Asunto(s)
Linfocitos B/patología , Transformación Celular Neoplásica/patología , Linfoma Folicular/patología , Proteínas Proto-Oncogénicas c-bcl-2/genética , Linfocitos B/metabolismo , Proteínas Adaptadoras de Señalización CARD/genética , Antígenos CD79/genética , Transformación Celular Neoplásica/genética , Femenino , Centro Germinal/metabolismo , Centro Germinal/patología , Guanilato Ciclasa/genética , Humanos , Linfoma Folicular/genética , Masculino , Persona de Mediana Edad , Mutación , Factor 88 de Diferenciación Mieloide/genéticaRESUMEN
PURPOSE: We aimed to assess the prognostic significance of follicular lymphoma-associated macrophages in the era of rituximab treatment and maintenance. EXPERIMENTAL DESIGN: We applied immunohistochemistry for CD68 and CD163 to two large tissue microarrays (TMA). The first TMA included samples from 186 patients from the BC Cancer Agency (BCCA) who had been treated with first-line systemic treatment including rituximab, cyclophosphamide, vincristine, and prednisone. The second contained 395 samples from PRIMA trial patients treated with rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone, and randomized to rituximab maintenance or observation. Macrophage infiltration was assessed using Aperio image analysis. Each of the two cohorts was randomly split into training/validation sets. RESULTS: An increased CD163-positive pixel count was predictive of adverse outcome in the BCCA dataset [5-year progression-free survival (PFS) 38% vs. 72%, respectively, P = 0.004 in the training cohort and 5-year PFS 29% vs. 61%, respectively, P = 0.004 in the validation cohort]. In the PRIMA trial, an increased CD163 pixel count was associated with favorable outcome (5-year PFS 60% vs. 44%, respectively, P = 0.011 in the training cohort and 5-year PFS 55% vs. 37%, respectively, P = 0.030 in the validation cohort). CONCLUSIONS: CD163-positive macrophages predict outcome in follicular lymphoma, but their prognostic impact is highly dependent on treatment received.
Asunto(s)
Antígenos CD/biosíntesis , Antígenos de Diferenciación Mielomonocítica/biosíntesis , Linfoma Folicular/tratamiento farmacológico , Linfoma Folicular/genética , Pronóstico , Receptores de Superficie Celular/biosíntesis , Rituximab/administración & dosificación , Anciano , Antígenos CD/genética , Antígenos de Diferenciación Mielomonocítica/genética , Ciclofosfamida/administración & dosificación , Supervivencia sin Enfermedad , Doxorrubicina/administración & dosificación , Femenino , Humanos , Linfoma Folicular/patología , Macrófagos/efectos de los fármacos , Macrófagos/metabolismo , Masculino , Persona de Mediana Edad , Receptores de Superficie Celular/genética , Análisis de Matrices Tisulares , Resultado del Tratamiento , Microambiente Tumoral/efectos de los fármacos , Vincristina/administración & dosificaciónRESUMEN
Primary testicular diffuse large B cell lymphoma (PTL) is an aggressive malignancy that occurs in the immune-privileged anatomical site of the testis. We have previously shown that structural genomic rearrangements involving the MHC class II transactivator CIITA and programmed death ligands (PDLs) 1 and 2 are frequent across multiple B cell lymphoma entities. Specifically in PTL, we found rearrangements in the PDL locus by fluorescence in situ hybridization (FISH). However, breakpoint anatomy and rearrangement partners were undetermined, while CIITA rearrangements had not been reported previously in PTL. Here, we performed bacterial artificial chromosome capture sequencing on three archival, formalin-fixed, paraffin-embedded tissue biopsies, interrogating 20 known rearrangement hotspots in B cell lymphomas. We report novel CIITA, FOXP1 and PDL rearrangements involving IGHG4, FLJ45248, RFX3, SMARCA2 and SNX29. Moreover, we present immunohistochemistry data supporting the association between PDL rearrangements and increased protein expression. Finally, using FISH, we show that CIITA (8/82; 10%) and FOXP1 (5/74; 7%) rearrangements are recurrent in PTL. In summary, we describe rearrangement frequencies and novel rearrangement partners of the CIITA, FOXP1 and PDL loci at base-pair resolution in a rare, aggressive lymphoma. Our data suggest immune-checkpoint inhibitor therapy as a promising intervention for PTL patients harbouring PDL rearrangements.
Asunto(s)
Antígeno B7-H1/genética , Factores de Transcripción Forkhead/genética , Reordenamiento Génico de Linfocito B/genética , Linfoma de Células B Grandes Difuso/genética , Proteína 2 Ligando de Muerte Celular Programada 1/genética , Proteínas Represoras/genética , Neoplasias Testiculares/genética , Puntos de Rotura del Cromosoma , Cromosomas Artificiales Bacterianos , Eliminación de Gen , Humanos , Inmunohistoquímica , Hibridación Fluorescente in Situ , Masculino , Proteínas Nucleares/genética , Recurrencia , Transactivadores/genética , Translocación Genética/genéticaRESUMEN
Classical Hodgkin lymphoma and primary mediastinal B cell lymphoma (PMBCL) are related lymphomas sharing pathological, molecular and clinical characteristics. Here we discovered by whole-genome and whole-transcriptome sequencing recurrent somatic coding-sequence mutations in the PTPN1 gene. Mutations were found in 6 of 30 (20%) Hodgkin lymphoma cases, in 6 of 9 (67%) Hodgkin lymphoma-derived cell lines, in 17 of 77 (22%) PMBCL cases and in 1 of 3 (33%) PMBCL-derived cell lines, consisting of nonsense, missense and frameshift mutations. We demonstrate that PTPN1 mutations lead to reduced phosphatase activity and increased phosphorylation of JAK-STAT pathway members. Moreover, silencing of PTPN1 by RNA interference in Hodgkin lymphoma cell line KM-H2 resulted in hyperphosphorylation and overexpression of downstream oncogenic targets. Our data establish PTPN1 mutations as new drivers in lymphomagenesis.
Asunto(s)
Enfermedad de Hodgkin/genética , Linfoma de Células B/genética , Neoplasias del Mediastino/genética , Mutación/genética , Proteína Tirosina Fosfatasa no Receptora Tipo 1/genética , Perfilación de la Expresión Génica/métodos , Técnicas de Silenciamiento del Gen , Genómica/métodos , Células HEK293 , Secuenciación de Nucleótidos de Alto Rendimiento , Enfermedad de Hodgkin/patología , Humanos , Inmunohistoquímica , Hibridación Fluorescente in Situ , Estimación de Kaplan-Meier , Captura por Microdisección con Láser , Linfoma de Células B/patología , Neoplasias del Mediastino/patología , Fosforilación , Interferencia de ARN , Reacción en Cadena en Tiempo Real de la PolimerasaRESUMEN
The pathogenesis of primary mediastinal large B-cell lymphoma (PMBCL) is incompletely understood. Recently, specific genotypic and phenotypic features have been linked to tumor cell immune escape mechanisms in PMBCL. We studied 571 B-cell lymphomas with a focus on PMBCL. Using fluorescence in situ hybridization here, we report that the programmed death ligand (PDL) locus (9p24.1) is frequently and specifically rearranged in PMBCL (20%) as compared with diffuse large B-cell lymphoma, follicular lymphoma, and Hodgkin lymphoma. Rearrangement was significantly correlated with overexpression of PDL transcripts. Utilizing high-throughput sequencing techniques, we characterized novel translocations and chimeric fusion transcripts involving PDLs at base-pair resolution. Our data suggest that recurrent genomic rearrangement events underlie an immune privilege phenotype in a subset of B-cell lymphomas.
Asunto(s)
Antígeno B7-H1/genética , Linfoma de Células B Grandes Difuso/genética , Neoplasias del Mediastino/genética , Proteína 2 Ligando de Muerte Celular Programada 1/genética , Translocación Genética , Línea Celular Tumoral , Cromosomas Humanos Par 9 , Variaciones en el Número de Copia de ADN , Regulación Neoplásica de la Expresión Génica , Frecuencia de los Genes , Humanos , Hibridación Fluorescente in Situ , Linfoma de Células B Grandes Difuso/epidemiología , Neoplasias del Mediastino/epidemiología , MutaciónRESUMEN
Diffuse large B-cell lymphoma (DLBCL) is a heterogeneous disease and "double-hit" DLBCL, with both MYC and BCL2 translocations has a poor prognosis. In this study, we investigated whether MYC and BCL2 protein expression in tissue would predict survival in DLBCL. The study included 106 cases of de novo DLBCL treated with rituximab and cyclophosphamide, doxorubicin, vincristine and prednisone (R-CHOP) or CHOP-like regimens. The results were validated on an independent cohort of 205 DLBCL patients. Patients with low expression of BCL2 (≤30%) and MYC (≤50%) had the best prognosis, whereas those with high BCL2 (>30%) and MYC (>50%) had the worst outcome. In multivariate analysis, the combination of the BCL2 and MYC was an independent predictor of overall survival (OS) and event-free survival (EFS) (P = 0·015 and P = 0·005, respectively). The risk of death was nine times greater for patients with high BCL2 and MYC compared to those with low expression. High BCL2 and MYC was a strong predictor of poor OS (P < 0·001) and EFS (P = 0·0017) in patients with the germinal centre B-cell (GCB) type, but not in the non-GCB type. In DLBCL, high co-expression of MYC and BCL2 was an independent predictor of poor survival, and could be used to stratify patients for risk-adapted therapies.
Asunto(s)
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Linfoma de Células B Grandes Difuso/tratamiento farmacológico , Linfoma de Células B Grandes Difuso/metabolismo , Proteínas Proto-Oncogénicas c-bcl-2/biosíntesis , Proteínas Proto-Oncogénicas c-myc/biosíntesis , Anciano , Anticuerpos Monoclonales de Origen Murino/administración & dosificación , Ciclofosfamida/administración & dosificación , Supervivencia sin Enfermedad , Doxorrubicina/administración & dosificación , Femenino , Genes myc , Humanos , Inmunohistoquímica , Linfoma de Células B Grandes Difuso/genética , Masculino , Persona de Mediana Edad , Prednisona/administración & dosificación , Pronóstico , Proteínas Proto-Oncogénicas c-bcl-2/genética , Proteínas Proto-Oncogénicas c-myc/genética , Rituximab , Análisis de Supervivencia , Resultado del Tratamiento , Vincristina/administración & dosificaciónRESUMEN
PURPOSE: To review the treatment and outcomes of patients with primary cutaneous B-cell lymphoma (CBCL). METHODS AND MATERIALS: Clinical characteristics, treatment, and outcomes were analyzed for all patients referred to our institution from 1981 through 2011 with primary CBCL without extracutaneous or distant nodal spread at diagnosis (n=136). Hematopathologists classified 99% of cases using the World Health Organization-European Organization for Research and Treatment of Cancer (WHO-EORTC) guidelines. RESULTS: Median age at diagnosis was 62 years. Classification was 18% diffuse large B-cell leg-type (DLBCL-leg), 32% follicle center (FCCL), 45% marginal zone (MZL), and 6% nonclassifiable (OTHER). Of the 111 subjects with indolent lymphoma (FCCL, MZL, OTHER), 79% received radiation alone (RT), 11% surgery alone, 3% chemotherapy alone, 4% chemotherapy followed by RT, and 3% observation. Following treatment, 29% of subjects relapsed. In-field recurrence occurred in 2% treated with RT and in 33% treated with surgery alone. Of the 25 subjects with DLBCL-leg, 52% received chemotherapy followed by RT, 24% chemotherapy, 20% RT, and 4% surgery alone. Seventy-nine percent received CHOP-type chemotherapy (cyclophosphamide, doxorubicin or epirubicin, vincristine, prednisone), 47% with rituximab added. Overall and disease-specific survival and time to progression at 5 years were 81%, 92%, and 69% for indolent and 26%, 61%, and 54% for DLBCL-leg, respectively. On Cox regression analysis of indolent subjects, RT was associated with better time to progression (P=.05). RT dose, chemo, age>60 y, and >1 lesion were not significantly associated with time to progression. For DLBCL-leg, disease-specific survival at 5 years was 100% for those receiving rituximab versus 67% for no rituximab (P=.13). CONCLUSIONS: This review demonstrates better outcomes for indolent histology compared with DLBCL-leg, validating the prognostic utility of the WHO-EORTC classification. In the indolent group, RT was associated with 98% local control. DLBCL-leg is a more aggressive disease; the excellent results in the rituximab group suggest it has an important role in management.
Asunto(s)
Linfoma de Células B/terapia , Neoplasias Cutáneas/terapia , Anticuerpos Monoclonales de Origen Murino/administración & dosificación , Protocolos de Quimioterapia Combinada Antineoplásica/administración & dosificación , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Ciclofosfamida/administración & dosificación , Doxorrubicina/administración & dosificación , Epirrubicina/administración & dosificación , Femenino , Humanos , Linfoma de Células B/clasificación , Linfoma de Células B/mortalidad , Linfoma de Células B/patología , Masculino , Persona de Mediana Edad , Recurrencia Local de Neoplasia , Prednisona/administración & dosificación , Estudios Retrospectivos , Rituximab , Neoplasias Cutáneas/clasificación , Neoplasias Cutáneas/mortalidad , Neoplasias Cutáneas/patología , Resultado del Tratamiento , Vincristina/administración & dosificaciónRESUMEN
Gain of function mutations in the H3K27 methyltransferase EZH2 represent a promising therapeutic target in germinal center lymphomas. In this study, we assessed the frequency and distribution of EZH2 mutations in a large cohort of patients with follicular lymphoma (FL) (n = 366) and performed a longitudinal analysis of mutation during the disease progression from FL to transformed FL (tFL) (n = 33). Mutations were detected at 3 recurrent mutation hot spots (Y646, A682, and A692) in 27% of FL cases with variant allele frequencies (VAF) ranging from 2% to 61%. By comparing VAF of EZH2 with other mutation targets (CREBBP, MLL2, TNFRSF14, and MEF2B), we were able to distinguish patients harboring clonal EZH2 mutation from rarer cases with subclonal mutations. Overall, the high incidence of EZH2 mutations in FL and their stability during disease progression makes FL an appropriate disease to evaluate EZH2 targeted therapy.
Asunto(s)
Biomarcadores de Tumor/genética , Linfoma Folicular/genética , Mutación , Complejo Represivo Polycomb 2/genética , Proteína de Unión a CREB/genética , Estudios de Cohortes , Análisis Mutacional de ADN , Progresión de la Enfermedad , Proteína Potenciadora del Homólogo Zeste 2 , Perfilación de la Expresión Génica , Frecuencia de los Genes , Humanos , Estimación de Kaplan-Meier , Linfoma Folicular/patología , Factores de Transcripción MEF2/genética , Miembro 14 de Receptores del Factor de Necrosis Tumoral/genética , Factores de TiempoRESUMEN
Epstein-Barr virus (EBV) is associated with Hodgkin lymphoma (HL) and can be detected by in situ hybridization (ISH) of viral nucleic acid (EBER) in tumor cells. We sought to determine whether plasma EBV-DNA could serve as a surrogate for EBER-ISH and to explore its prognostic utility in HL. Specimens from the Cancer Cooperative Intergroup Trial E2496 were used to compare pretreatment plasma EBV-DNA quantification with EBV tumor status by EBER-ISH. A cutoff of >60 viral copies/100 µL plasma yielded 96% concordance with EBER-ISH. Pretreatment and month 6 plasma specimens were designated EBV(-) or EBV(+) by this cutoff. Patients with pretreatment EBV(+) plasma (n = 54) had inferior failure-free survival (FFS) compared with those with pretreatment EBV(-) plasma (n = 274), log-rank P = .009. By contrast, no difference in FFS was observed when patients were stratified by EBER-ISH. Pretreatment plasma EBV positivity was an independent predictor of treatment failure on multivariate analyses. At month 6, plasma EBV(+) patients (n = 7) had inferior FFS compared with plasma EBV(-) patients (n = 125), log-rank P = .007. These results confirm that plasma EBV-DNA is highly concordant with EBER-ISH in HL and suggest that it may have prognostic utility both at baseline and after therapy. This trial was registered at www.clinicaltrials.gov as #NCT00003389.