RESUMEN
The ß-delayed proton decay of ^{13}O has previously been studied, but the direct observation of ß-delayed 3αp decay has not been reported. Rare 3αp events from the decay of excited states in ^{13}N^{â} provide a sensitive probe of cluster configurations in ^{13}N. To measure the low-energy products following ß-delayed 3αp decay, the Texas Active Target (TexAT) time projection chamber was employed using the one-at-a-time ß-delayed charged-particle spectroscopy technique at the Cyclotron Institute, Texas A&M University. A total of 1.9×10^{5} ^{13}O implantations were made inside the TexAT time projection chamber. A total of 149 3αp events were observed, yielding a ß-delayed 3αp branching ratio of 0.078(6)%. Four previously unknown α-decaying excited states were observed in ^{13}N at 11.3, 12.4, 13.1, and 13.7 MeV decaying via the 3α+p channel.
Asunto(s)
Protones , Humanos , Análisis EspectralRESUMEN
Glioblastoma (GBM) is an aggressive cancer with a very poor prognosis. Generally viewed as weakly immunogenic, GBM responds poorly to current immunotherapies. To understand this problem more clearly we used a combination of natural killer (NK) cell functional assays together with gene and protein expression profiling to define the NK cell response to GBM and explore immunosuppression in the GBM microenvironment. In addition, we used transcriptome data from patient cohorts to classify GBM according to immunological profiles. We show that glioma stem-like cells, a source of post-treatment tumour recurrence, express multiple immunomodulatory cell surface molecules and are targeted in preference to normal neural progenitor cells by natural killer (NK) cells ex vivo. In contrast, GBM-infiltrating NK cells express reduced levels of activation receptors within the tumour microenvironment, with hallmarks of transforming growth factor (TGF)-ß-mediated inhibition. This NK cell inhibition is accompanied by expression of multiple immune checkpoint molecules on T cells. Single-cell transcriptomics demonstrated that both tumour and haematopoietic-derived cells in GBM express multiple, diverse mediators of immune evasion. Despite this, immunome analysis across a patient cohort identifies a spectrum of immunological activity in GBM, with active immunity marked by co-expression of immune effector molecules and feedback inhibitory mechanisms. Our data show that GBM is recognized by the immune system but that anti-tumour immunity is restrained by multiple immunosuppressive pathways, some of which operate in the healthy brain. The presence of immune activity in a subset of patients suggests that these patients will more probably benefit from combination immunotherapies directed against multiple immunosuppressive pathways.
Asunto(s)
Neoplasias Encefálicas/inmunología , Perfilación de la Expresión Génica/métodos , Glioblastoma/inmunología , Tolerancia Inmunológica/inmunología , Células Asesinas Naturales/inmunología , Células Madre Neoplásicas/inmunología , Neoplasias Encefálicas/genética , Neoplasias Encefálicas/patología , Línea Celular Tumoral , Células Cultivadas , Estudios de Cohortes , Citotoxicidad Inmunológica/genética , Citotoxicidad Inmunológica/inmunología , Regulación Neoplásica de la Expresión Génica/inmunología , Redes Reguladoras de Genes/inmunología , Glioblastoma/genética , Glioblastoma/patología , Humanos , Tolerancia Inmunológica/genética , Células Asesinas Naturales/metabolismo , Células Madre Neoplásicas/metabolismo , Fenotipo , Pronóstico , Transducción de Señal/genética , Transducción de Señal/inmunología , Microambiente Tumoral/genética , Microambiente Tumoral/inmunologíaRESUMEN
BACKGROUND: Circulating cell-free DNA (cfDNA) is not found in healthy subjects, but is readily detected after thermal injury and may contribute to the risk of multiple organ failure. The hypothesis was that a postburn reduction in DNase protein/enzyme activity could contribute to the increase in cfDNA following thermal injury. METHODS: Patients with severe burns covering at least 15 per cent of total body surface area were recruited to a prospective cohort study within 24 h of injury. Blood samples were collected from the day of injury for 12 months. RESULTS: Analysis of blood samples from 64 patients revealed a significant reduction in DNase activity on days 1-28 after injury, compared with healthy controls. DNase protein levels were not affected, suggesting the presence of an enzyme inhibitor. Further analysis revealed that actin (an inhibitor of DNase) was present in serum samples from patients but not those from controls, and concentrations of the actin scavenging proteins gelsolin and vitamin D-binding protein were significantly reduced after burn injury. In a pilot study of ten military patients with polytrauma, administration of blood products resulted in an increase in DNase activity and gelsolin levels. CONCLUSION: The results of this study suggest a novel biological mechanism for the accumulation of cfDNA following thermal injury by which high levels of actin released by damaged tissue cause a reduction in DNase activity. Restoration of the actin scavenging system could therefore restore DNase activity, and reduce the risk of cfDNA-induced host tissue damage and thrombosis.
ANTECEDENTES: El ADN libre de las células circulantes (circulating cell-free DNA, cfDNA) no se encuentra en sujetos sanos, pero se detecta fácilmente después de una lesión térmica y puede contribuir al riesgo de fallo multiorgánico. La hipótesis fue que una disminución en la actividad de la proteína/enzima ADNasa tras la lesión térmica podría contribuir a la elevación del cfDNA que ocurre tras la misma. MÉTODOS: Los pacientes con quemaduras graves con una extensión ≥ 15% del área de superficie corporal total (total body surface area, TBSA) se incluyeron en un estudio prospectivo de cohortes durante las primeras 24 horas posteriores a la lesión. Se recogieron muestras de sangre desde el día de la lesión hasta los 12 meses posteriores a la misma. RESULTADOS: El análisis de muestras de sangre de 64 pacientes reveló una reducción significativa de la actividad de la ADNasa en los días 1 a 28 después de la lesión, en comparación con los controles sanos. Los niveles de proteína ADNasa no se vieron afectados, lo que sugiere la presencia de un inhibidor enzimático. Un análisis adicional reveló que la actina (un inhibidor de la ADNasa) estaba presente en las muestras de suero de los pacientes, pero no en los controles, y las concentraciones de la gelsolina, proteína que causa la disociación de la actina, y la proteína de unión a la vitamina D se redujeron significativamente después de la lesión térmica. En un estudio piloto de 10 pacientes con politrauma por lesiones militares, la administración de hemoderivados produjo un aumento en la actividad de la ADNasa y de los niveles de gelsolina. CONCLUSIÓN: Este estudio sugiere un nuevo mecanismo biológico para la acumulación de cfDNA después de una lesión térmica, por el cual los altos niveles de actina liberada por el tejido dañado causarían una reducción en la actividad de la ADNasa. La restauración del sistema eliminador de actina podría, por lo tanto, restaurar la actividad de la ADNasa y reducir el riesgo de daño tisular y trombosis en el huésped inducido por el cfDNA.
Asunto(s)
Actinas/metabolismo , Quemaduras/metabolismo , Desoxirribonucleasas/metabolismo , Actinas/sangre , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Quemaduras/sangre , Quemaduras/enzimología , Estudios de Casos y Controles , Ácidos Nucleicos Libres de Células/sangre , Ácidos Nucleicos Libres de Células/metabolismo , Desoxirribonucleasas/sangre , Femenino , Fluorometría/métodos , Gelsolina/sangre , Humanos , Masculino , Persona de Mediana Edad , Estudios Prospectivos , Proteína de Unión a Vitamina D/sangre , Adulto JovenRESUMEN
BACKGROUND: Melanoma risk prediction models could be useful for matching preventive interventions to patients' risk. OBJECTIVES: To develop and validate a model for incident first-primary cutaneous melanoma using clinically assessed risk factors. METHODS: We used unconditional logistic regression with backward selection from the Australian Melanoma Family Study (461 cases and 329 controls) in which age, sex and city of recruitment were kept in each step, and we externally validated it using the Leeds Melanoma Case-Control Study (960 cases and 513 controls). Candidate predictors included clinically assessed whole-body naevi and solar lentigines, and self-assessed pigmentation phenotype, sun exposure, family history and history of keratinocyte cancer. We evaluated the predictive strength and discrimination of the model risk factors using odds per age- and sex-adjusted SD (OPERA) and the area under curve (AUC), and calibration using the Hosmer-Lemeshow test. RESULTS: The final model included the number of naevi ≥ 2 mm in diameter on the whole body, solar lentigines on the upper back (a six-level scale), hair colour at age 18 years and personal history of keratinocyte cancer. Naevi was the strongest risk factor; the OPERA was 3·51 [95% confidence interval (CI) 2·71-4·54] in the Australian study and 2·56 (95% CI 2·23-2·95) in the Leeds study. The AUC was 0·79 (95% CI 0·76-0·83) in the Australian study and 0·73 (95% CI 0·70-0·75) in the Leeds study. The Hosmer-Lemeshow test P-value was 0·30 in the Australian study and < 0·001 in the Leeds study. CONCLUSIONS: This model had good discrimination and could be used by clinicians to stratify patients by melanoma risk for the targeting of preventive interventions. What's already known about this topic? Melanoma risk prediction models may be useful in prevention by tailoring interventions to personalized risk levels. For reasons of feasibility, time and cost many melanoma prediction models use self-assessed risk factors. However, individuals tend to underestimate their naevus numbers. What does this study add? We present a melanoma risk prediction model, which includes clinically-assessed whole-body naevi and solar lentigines, and self-assessed risk factors including pigmentation phenotype and history of keratinocyte cancer. This model performs well on discrimination, the model's ability to distinguish between individuals with and without melanoma, and may assist clinicians to stratify patients by melanoma risk for targeted preventive interventions.
Asunto(s)
Lentigo , Melanoma , Neoplasias Cutáneas , Adolescente , Australia/epidemiología , Estudios de Casos y Controles , Humanos , Lentigo/epidemiología , Melanoma/diagnóstico , Melanoma/epidemiología , Melanoma/etiología , Factores de Riesgo , Neoplasias Cutáneas/epidemiología , Neoplasias Cutáneas/etiologíaRESUMEN
Cryoprotective agents (CPAs) are routinely applied in cryopreservation protocols to achieve the vitrified state thereby avoiding the damaging effects of ice crystals. Once the CPA has been added, the system needs to cool at a rate ≥ critical cooling rate (CCR) to avoid ice crystallization and successfully enter the vitrified state. Subsequently, upon warming the system needs to meet or exceed a critical warming rate (CWR), often one to two orders of magnitude higher than the CCR, to avoid ice formation and return the system to physiological temperatures for use. Many experimental and theoretical studies have been published on CCRs and CWRs, and correlation for these rates as a function of concentration has been explored for some single component CPAs, but not the CPA cocktails which are commonly used in tissue and organ cryopreservation. In this paper, we summarize the available data of CCRs and CWRs for a variety of CPAs, and suggest a convenient mathematical expression for CCR and CWR that can guide general use for cryoprotective protocol, but also highlights the critical need for further study on CPA cocktails and tissue systems in which CPAs may behave differently and/or may not be fully equilibrated to the loaded CPA.
Asunto(s)
Criopreservación , Crioprotectores , Frío , Criopreservación/métodos , Crioprotectores/farmacologíaRESUMEN
BACKGROUND: People at high risk of developing melanoma are usually identified by pigmentary and naevus phenotypes. OBJECTIVE: We examined whether associations of these phenotypes with melanoma risk differed by ambient sun exposure or participant characteristics in two population-based, case-control studies with comparable ancestry but different ambient sun exposure. METHODS: Data were analysed from 616 cases and 496 controls from the Australian Melanoma Family Study and 2012 cases and 504 controls from the Leeds (UK) case-control study. Questionnaire, interview and dermatological skin examination data were collected using the same measurement protocols. Relative risks were estimated as odds ratios using unconditional logistic regression, adjusted for potential confounders. RESULTS: Hair and skin colour were the strongest pigmentary phenotype risk factors. All associations of pigmentary phenotype with melanoma risk were similar across countries. The median number of clinically assessed naevi was approximately three times higher in Australia than Leeds, but the relative risks for melanoma associated with each additional common or dysplastic naevus were higher for Leeds than Australia, especially for naevi on the upper and lower limbs. Higher naevus counts on the head and neck were associated with a stronger relative risk for melanoma for women than men. The two countries had similar relative risks for melanoma based on self-reported naevus density categories, but personal perceptions of naevus number differed by country. There was no consistent evidence of interactions between phenotypes on risk. CONCLUSIONS: Classifying people at high risk of melanoma based on their number of naevi should ideally take into account their country of residence, type of counts (clinical or self-reported), body site on which the naevus counts are measured and sex. The presence of naevi may be a stronger indicator of a genetic predisposition in the UK than in Australia based on less opportunity for sun exposure to influence naevus development.
Asunto(s)
Exposición a Riesgos Ambientales , Melanoma/etnología , Nevo Pigmentado/etnología , Neoplasias Cutáneas/etnología , Pigmentación de la Piel , Luz Solar , Adolescente , Adulto , Anciano , Australia/epidemiología , Estudios de Casos y Controles , Extremidades , Femenino , Color del Cabello , Humanos , Masculino , Persona de Mediana Edad , Nevo Pigmentado/patología , Fenotipo , Medición de Riesgo , Factores de Riesgo , Factores Sexuales , Neoplasias Cutáneas/patología , Carga Tumoral , Reino Unido/epidemiología , Población Blanca , Adulto JovenRESUMEN
OBJECTIVES: To describe the 'Resuscitation with Pre-HospItaL bLood products' trial (RePHILL) - a multi-centre randomised controlled trial of pre-hospital blood product (PHBP) administration vs standard care for traumatic haemorrhage. BACKGROUND: PHBP are increasingly used for pre-hospital trauma resuscitation despite a lack of robust evidence demonstrating superiority over crystalloids. Provision of PHBP carries additional logistical and regulatory implications, and requires a sustainable supply of universal blood components. METHODS: RePHILL is a multi-centre, two-arm, parallel group, open-label, phase III randomised controlled trial currently underway in the UK. Patients attended by a pre-hospital emergency medical team, with traumatic injury and hypotension (systolic blood pressure <90 mmHg or absent radial pulse) believed to be due to traumatic haemorrhage are eligible. Exclusion criteria include age <16 years, blood product receipt on scene prior to randomisation, Advanced Medical Directive forbidding blood product administration, pregnancy, isolated head injury and prisoners. A total of 490 patients will be recruited in a 1 : 1 ratio to receive either the intervention (up to two units of red blood cells and two units of lyophilised plasma) or the control (up to four boluses of 250 mL 0.9% saline). The primary outcome measure is a composite of failure to achieve lactate clearance of ≥20%/h over the first 2 hours after randomisation and all-cause mortality between recruitment and discharge from the primary receiving facility to non-acute care. Secondary outcomes include pre-hospital time, coagulation indices, in-hospital transfusion requirements and morbidity. RESULTS: Pilot study recruitment began in December 2016. Approval to proceed to the main trial was received in June 2017. Recruitment is expected to continue until 2020. CONCLUSIONS: RePHILL will provide high-quality evidence regarding the efficacy and safety of PHBP resuscitation for trauma.
Asunto(s)
Transfusión de Componentes Sanguíneos , Soluciones Cristaloides/administración & dosificación , Resucitación , Heridas y Lesiones/terapia , Femenino , Humanos , Masculino , Reino UnidoRESUMEN
Excited states in certain atomic nuclei possess an unusual structure, where the dominant degrees of freedom are those of α clusters rather than individual nucleons. It has been proposed that the diffuse 3α system of the ^{12}C Hoyle state may behave like a Bose-Einstein condensate, where the α clusters maintain their bosonic identities. By measuring the decay of the Hoyle state into three α particles, we obtained an upper limit for the rare direct 3α decay branch of 0.047%. This value is now at a level comparable with theoretical predictions and could be a sensitive probe of the structure of this state.
RESUMEN
A number of drugs, including triptans, promote migraine chronification in susceptible individuals. In rats, a period of triptan administration over 7 days can produce "latent sensitization" (14 days after discontinuation of drug) demonstrated as enhanced sensitivity to presumed migraine triggers such as environmental stress and lowered threshold for electrically induced cortical spreading depression (CSD). Here we have used fMRI to evaluate the early changes in brain networks at day 7 of sumatriptan administration that may induce latent sensitization as well as the potential response to stress. After continuous infusion of sumatriptan, rats were scanned to measure changes in resting state networks and the response to bright light environmental stress. Rats receiving sumatriptan, but not saline infusion, showed significant differences in default mode, autonomic, basal ganglia, salience, and sensorimotor networks. Bright light stress produced CSD-like responses in sumatriptan-treated but not control rats. Our data show the first brain-related changes in a rat model of medication overuse headache and suggest that this approach could be used to evaluate the multiple brain networks involved that may promote this condition.
Asunto(s)
Ganglios Basales/efectos de los fármacos , Corteza Cerebral/efectos de los fármacos , Depresión de Propagación Cortical , Agonistas del Receptor de Serotonina 5-HT1/farmacología , Estrés Psicológico/fisiopatología , Sumatriptán/farmacología , Animales , Ganglios Basales/fisiología , Corteza Cerebral/fisiología , Luz/efectos adversos , Masculino , Ratas , Ratas Sprague-Dawley , Estrés Psicológico/etiologíaRESUMEN
BACKGROUND & AIMS: The leukocyte composition of tumors is heterogeneous, as is the involvement of each leukocyte subset in promoting or restraining tumorigenesis. This heterogeneity reflects the tissue of origin, tumor stage, and the functional state of leukocyte activation, but its biological roots remain poorly understood. Since tumorigenesis is driven by various genetic events, we assessed the role of driver genes in shaping the profiles and the roles of leukocytes in tumorigenesis. METHODS: Mouse liver tumors were induced by hepatic overexpression of either MYC or the combination of myristoylated AKT and NRAS(V12) oncogenes via hydrodynamic transfection. A comparative, flow cytometry- and histology-based immunophenotyping of liver-infiltrating leukocytes was performed at various stages of liver tumorigenesis. The roles of the most abundant leukocyte subsets in tumorigenesis were addressed by immunodepletion. The contribution of liver injury was assessed by comparing the injury-inducing hydrodynamic transfection model to a model in which MYC is an inducible transgene. RESULTS: Myristoylated AKT and NRAS(V12) promoted a marked recruitment of CD11b(+)Ly6G(hi)Ly6C(int) neutrophils and CD11b(+)Ly6G(-)Ly6C(hi) monocytes to the liver, but their immunodepletion did not alter tumorigenesis. In contrast, despite minimal invasion by monocytes/neutrophils during MYC-driven tumorigenesis, immunodepletion of these cells reduced MYC tumor burden and extended survival. MYC-driven tumor initiation was augmented specifically by Ly6C+ monocytes and their ability to promote liver injury. CONCLUSIONS: Our results demonstrate that leukocyte profiles do not necessarily predict their involvement in tumorigenesis, the functional role of leukocytes can be shaped by oncogenes, and that monocyte-dependent tissue injury selectively cooperates with MYC during tumorigenesis.
Asunto(s)
Genes myc/fisiología , Neoplasias Hepáticas Experimentales/etiología , Monocitos/fisiología , Animales , Antígenos Ly/análisis , Femenino , Genes ras , Ratones , Infiltración Neutrófila , Proteínas Proto-Oncogénicas c-akt/genética , Receptores de Quimiocina/análisisRESUMEN
Survival from melanoma is influenced by several, well-established clinical and histopathological factors, e.g. age, Breslow thickness and microscopic ulceration. We (the Section of Epidemiology and Biostatistics, University of Leeds) have carried out research to better understand the biological basis for these observations. Preliminary results indicated a protective role for vitamin D in melanoma relapse and that higher vitamin D was associated with thinner primary melanomas. Funding from the British Skin Foundation enabled JNB to establish a study of the effects of vitamin A in melanoma. The results suggested that vitamin A could reduce the protective effect of vitamin D in terms of overall survival. Therefore, we propose that vitamin D3 supplementation alone might be preferable to combined multivitamin preparations, where vitamin D supplementation is deemed to be appropriate. Proving a causal link between vitamin D and melanoma-specific survival is challenging. We have shown limited evidence of causation in a Mendelian randomization experiment (described in more detail later). Recent work in Leeds has also shown that higher vitamin D may be protective for microscopic ulceration. Taken together, vitamin D appears to be associated with less aggressive primary melanomas and may itself influence outcome. We continue to explore the role of vitamin D in melanoma survival and the optimum levels that might be crucial.
RESUMEN
AIM: Non-epithelial tumors of the larynx are rare and encompass a wide range of pathology. We present the decade-long experience of a single institution to define clinical presentations and outcomes. MATERIAL AND METHODS: This is a ten year retrospective chart review of a tertiary head and neck cancer center. Index patients were identified from a review of a pathology database, and patient demographics, presenting signs and symptoms, treatment modalities, and clinical outcomes were extracted from electronic medical records. Epithelial tumors (squamous cell carcinoma, spindle cell carcinoma, and salivary tumors), granulomas, sarcoidosis, papilloma, and amyloidosis were all excluded. RESULTS: Twenty-four patients with ages ranging from 2months-old to 84years were identified. Malignant lesions (11) included chondrosarcoma (6), Kaposi's sarcoma (2), metastatic melanoma, synovial cell sarcoma, and T cell neoplasm. Six were operated upon endolaryngeally, but four required either upfront or salvage total laryngectomy. Two received adjuvant therapy. Benign lesions (13) included hemangioma (4), granular cell tumor (3), myofibroblastic tumor (2), schwannoma (2), chondroma, and ossifying fibromyxoid tumor. Nine underwent endolaryngeal operations, and four were managed medically or with observation. None have required aggressive open resection or total laryngectomy. CONCLUSION: Treatment approach of non-epithelial tumors of the larynx depends on the site and extent of the tumor, histology, and sensitivity of adjuvant therapy. Benign tumors can be managed without need for aggressive resection thereby sparing laryngeal function.
Asunto(s)
Carcinoma/patología , Carcinoma/terapia , Neoplasias Laríngeas/patología , Neoplasias Laríngeas/terapia , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Carcinoma/mortalidad , Niño , Preescolar , Terapia Combinada , Femenino , Humanos , Lactante , Neoplasias Laríngeas/mortalidad , Laringectomía , Masculino , Persona de Mediana Edad , Estudios Retrospectivos , Resultado del Tratamiento , Adulto JovenRESUMEN
Epidemiologic and clinicopathologic features, therapeutic strategies, and prognosis for acinic cell carcinoma of the major and minor salivary glands are critically reviewed. We explore histopathologic, histochemical, electron microscopic and immunohistochemical aspects and discuss histologic grading, histogenesis, animal models, and genetic events. In the context of possible diagnostic difficulties, the relationship to mammary analog secretory carcinoma is probed and a classification is suggested. Areas of controversy or uncertainty, which may benefit from further investigations, are also highlighted.
Asunto(s)
Carcinoma de Células Acinares , Animales , Carcinoma de Células Acinares/epidemiología , Carcinoma de Células Acinares/metabolismo , Carcinoma de Células Acinares/patología , Carcinoma de Células Acinares/terapia , Diagnóstico Diferencial , Modelos Animales de Enfermedad , Humanos , Microscopía Electrónica , Glándula Parótida , Cuidados Preoperatorios , Pronóstico , Neoplasias de las Glándulas Salivales/epidemiología , Neoplasias de las Glándulas Salivales/metabolismo , Neoplasias de las Glándulas Salivales/patología , Neoplasias de las Glándulas Salivales/terapia , Glándulas Salivales MenoresRESUMEN
Experiments were conducted over 2 years to quantify the response of faba bean (Vicia faba L.) to heat stress. Potted winter faba bean plants (cv. Wizard) were exposed to temperature treatments (18/10; 22/14; 26/18; 30/22; 34/26 °C day/night) for 5 days during floral development and anthesis. Developmental stages of all flowers were scored prior to stress, plants were grown in exclusion from insect pollinators to prevent pollen movement between flowers, and yield was harvested at an individual pod scale, enabling effects of heat stress to be investigated at a high resolution. Susceptibility to stress differed between floral stages; flowers were most affected during initial green-bud stages. Yield and pollen germination of flowers present before stress showed threshold relationships to stress, with lethal temperatures (t50) Ë28 °C and ~32 °C, while whole plant yield showed a linear negative relationship to stress with high plasticity in yield allocation, such that yield lost at lower nodes was partially compensated at higher nodal positions. Faba bean has many beneficial attributes for sustainable modern cropping systems but these results suggest that yield will be limited by projected climate change, necessitating the development of heat tolerant cultivars, or improved resilience by other mechanisms such as earlier flowering times.
RESUMEN
BACKGROUND: The melanocortin-1-receptor (MC1R) gene regulates human pigmentation and is highly polymorphic in populations of European origins. The aims of this study were to evaluate the association between MC1R variants and the risk of non-melanoma skin cancer (NMSC), and to investigate whether risk estimates differed by phenotypic characteristics. METHODS: Data on 3527 NMSC cases and 9391 controls were gathered through the M-SKIP Project, an international pooled-analysis on MC1R, skin cancer and phenotypic characteristics. We calculated summary odds ratios (SOR) with random-effect models, and performed stratified analyses. RESULTS: Subjects carrying at least one MC1R variant had an increased risk of NMSC overall, basal cell carcinoma (BCC) and squamous cell carcinoma (SCC): SOR (95%CI) were 1.48 (1.24-1.76), 1.39 (1.15-1.69) and 1.61 (1.35-1.91), respectively. All of the investigated variants showed positive associations with NMSC, with consistent significant results obtained for V60L, D84E, V92M, R151C, R160W, R163Q and D294H: SOR (95%CI) ranged from 1.42 (1.19-1.70) for V60L to 2.66 (1.06-6.65) for D84E variant. In stratified analysis, there was no consistent pattern of association between MC1R and NMSC by skin type, but we consistently observed higher SORs for subjects without red hair. CONCLUSIONS: Our pooled-analysis highlighted a role of MC1R variants in NMSC development and suggested an effect modification by red hair colour phenotype.
Asunto(s)
Predisposición Genética a la Enfermedad , Receptor de Melanocortina Tipo 1/genética , Neoplasias Cutáneas/genética , Carcinoma Basocelular/genética , Carcinoma de Células Escamosas/genética , Color del Cabello , Humanos , Oportunidad Relativa , Fenotipo , Riesgo , Neoplasias Cutáneas/etiologíaRESUMEN
BACKGROUND: To determine genomic alterations in head and neck squamous cell carcinoma (HNSCC) using formalin-fixed, paraffin-embedded (FFPE) tumors obtained through routine clinical practice, selected cancer-related genes were evaluated and compared with alterations seen in frozen tumors obtained through research studies. PATIENTS AND METHODS: DNA samples obtained from 252 FFPE HNSCC were analyzed using next-generation sequencing-based (NGS) clinical assay to determine sequence and copy number variations in 236 cancer-related genes plus 47 introns from 19 genes frequently rearranged in cancer. Human papillomavirus (HPV) status was determined by presence of the HPV DNA sequence in all samples and corroborated with high-risk HPV in situ hybridization (ISH) and p16 immunohistochemical (IHC) staining in a subset of tumors. Sequencing data from 399 frozen tumors in The Cancer Genome Atlas and University of Chicago public datasets were analyzed for comparison. RESULTS: Among 252 FFPE HNSCC, 84 (33%) were HPV positive and 168 (67%) were HPV negative by sequencing. A subset of 40 tumors with HPV ISH and p16 IHC results showed complete concordance with NGS-derived HPV status. The most common genes with genomic alterations were PIK3CA and PTEN in HPV-positive tumors and TP53 and CDKN2A/B in HPV-negative tumors. In the pathway analysis, the PI3K pathway in HPV-positive tumors and DNA repair-p53 and cell cycle pathways in HPV-negative tumors were frequently altered. The HPV-positive oropharynx and HPV-positive nasal cavity/paranasal sinus carcinoma shared similar mutational profiles. CONCLUSION: The genomic profile of FFPE HNSCC tumors obtained through routine clinical practice is comparable with frozen tumors studied in research setting, demonstrating the feasibility of comprehensive genomic profiling in a clinical setting. However, the clinical significance of these genomic alterations requires further investigation through application of these genomic profiles as integral biomarkers in clinical trials.
Asunto(s)
Biomarcadores de Tumor/genética , Carcinoma de Células Escamosas/genética , Perfilación de la Expresión Génica/métodos , Neoplasias de Cabeza y Cuello/genética , Secuenciación de Nucleótidos de Alto Rendimiento , Adulto , Anciano , Anciano de 80 o más Años , Biomarcadores de Tumor/análisis , Carcinoma de Células Escamosas/química , Carcinoma de Células Escamosas/patología , Carcinoma de Células Escamosas/virología , Inhibidor p16 de la Quinasa Dependiente de Ciclina/análisis , Variaciones en el Número de Copia de ADN , ADN Viral/genética , Bases de Datos Genéticas , Femenino , Fijadores , Formaldehído , Estudios de Asociación Genética , Predisposición Genética a la Enfermedad , Neoplasias de Cabeza y Cuello/química , Neoplasias de Cabeza y Cuello/patología , Neoplasias de Cabeza y Cuello/virología , Pruebas de ADN del Papillomavirus Humano , Humanos , Inmunohistoquímica , Hibridación in Situ , Masculino , Persona de Mediana Edad , Mutación , Papillomaviridae/genética , Adhesión en Parafina , Fenotipo , Valor Predictivo de las Pruebas , Pronóstico , Carcinoma de Células Escamosas de Cabeza y Cuello , Fijación del TejidoRESUMEN
In the absence of a firm link between individual meteorites and their asteroidal parent bodies, asteroids are typically characterized only by their light reflection properties, and grouped accordingly into classes. On 6 October 2008, a small asteroid was discovered with a flat reflectance spectrum in the 554-995 nm wavelength range, and designated 2008 TC(3) (refs 4-6). It subsequently hit the Earth. Because it exploded at 37 km altitude, no macroscopic fragments were expected to survive. Here we report that a dedicated search along the approach trajectory recovered 47 meteorites, fragments of a single body named Almahata Sitta, with a total mass of 3.95 kg. Analysis of one of these meteorites shows it to be an achondrite, a polymict ureilite, anomalous in its class: ultra-fine-grained and porous, with large carbonaceous grains. The combined asteroid and meteorite reflectance spectra identify the asteroid as F class, now firmly linked to dark carbon-rich anomalous ureilites, a material so fragile it was not previously represented in meteorite collections.
RESUMEN
PURPOSE: Despite the large number of people affected by melanoma, little is known about the specific needs of melanoma patients. Understanding the effects of melanoma diagnosis and the specific supportive care needs of this group of patients is a necessary step towards provision of effective psychosocial care. METHODS: Semi-structured interviews were carried out with 15 patients with malignant melanoma of the skin. The sample size, which was purposive, included 8 females and 7 males from 27 to 78 years old. Data were analysed using the NVIVO 8 software and principles of thematic analysis. RESULTS: Four major areas were identified: (a) Emotional effects due to body image, fear of the sun and uncertainty for the future; (b) Effects on Relationships, with some patients in need of more support than others from family and work colleagues; (c) Functional effects due to on-going symptoms such as pain and lymphedema; and (d) Health System and Information Needs, around the clarity, quality and timing of the information received from the health care professionals. CONCLUSIONS: The findings suggest that we often fail to pick up melanoma patients' health and psychosocial needs and fail to refer them appropriately, rather than the services not being available. Interventions should focus on patient and carer education about melanoma and sun protection, psychosocial support and effective information giving. Patient-reported outcome measures should routinely be collected to identify issues of specific concerns to the patients and directing them to the right services based on their individual needs.
Asunto(s)
Necesidades y Demandas de Servicios de Salud , Melanoma/terapia , Cuidados Paliativos , Adaptación Psicológica , Adulto , Anciano , Estudios Transversales , Emociones , Femenino , Personal de Salud , Necesidades y Demandas de Servicios de Salud/estadística & datos numéricos , Humanos , Masculino , Melanoma/diagnóstico , Melanoma/psicología , Persona de Mediana Edad , Cuidados Paliativos/métodos , Cuidados Paliativos/estadística & datos numéricos , Calidad de Vida , Neoplasias Cutáneas , Apoyo Social , Melanoma Cutáneo MalignoRESUMEN
BACKGROUND: Knowledge about supportive care needs in patients with cutaneous invasive melanoma is scarce. We examined the unmet needs of melanoma patients treated with surgery and factors associated with these needs to assist health professionals identify areas needing clinical attention. PATIENTS AND METHODS: Cross-sectional multisite survey of UK patients ascertained 3 months to 5 years after complete resection of stage I-III cutaneous melanoma. Participants completed the following validated questionnaires: Supportive Care Needs Survey (SCNS-SF34 with melanoma module), Hospital Anxiety and Depression Scale and 51-item Functional Assessment of Cancer Therapy-Melanoma quality-of-life scale. RESULTS: A total of 472 participants were recruited [319 (67%) clinical stage I-II). Mean age was 60 years (standard deviation = 14) and 255 (54%) were female. One hundred and twenty-three (27%) participants reported at least one unmet need (mostly 'low' level). The most frequently reported unmet needs were fears of cancer returning (n = 138, 29%), uncertainty about the future (n = 119, 25%), lack of information about risk of recurrence (n = 112, 24%) and about possible outcomes if melanoma were to spread (n = 91, 20%). One hundred and thirty-eight (29%) participants reported anxiety and 51 (11%) depression at clinical or subclinical levels. Patients with nodal disease had a significantly higher level of unmet supportive care needs (P < 0.001) as did patients with anxiety or depression (P < 0.001). Key correlates of the total SCNS-SF34 score for unmet supportive care needs were younger age (odds ratio, OR = 2.23, P < 0.001) and leaving school early (OR = 4.85, P < 0.001), while better emotional (OR = 0.89, P < 0.001) and social well-being (OR = 0.91, P < 0.001) were linked with fewer unmet needs. Neither patients' sex nor tumour thickness was associated with unmet needs. CONCLUSIONS: Around a quarter of melanoma patients may have unmet support needs in the mid to long term after primary treatment. In particular, patients who are younger, less educated, distressed or socially isolated could benefit from more support.