Subduction hides high-pressure sources of energy that may feed the deep subsurface biosphere.

Geological sources of H2 and abiotic CH4 have had a critical role in the evolution of our planet and the development of life and sustainability of the deep subsurface biosphere. Yet the origins of these sources are largely unconstrained. Hydration of mantle rocks, or serpentinization, is widely recognized to produce H2 and favour the abiotic genesis of CH4 in shallow settings. However, deeper sources of H2 and abiotic CH4 are missing from current models, which mainly invoke more oxidized fluids at convergent margins. Here we combine data from exhumed subduction zone high-pressure rocks and thermodynamic modelling to show that deep serpentinization (40-80 km) generates significant amounts of H2 and abiotic CH4, as well as H2S and NH3. Our results suggest that subduction, worldwide, hosts large sources of deep H2 and abiotic CH4, potentially providing energy to the overlying subsurface biosphere in the forearc regions of convergent margins.

Lung cancer management: monitoring and treating resistance development in third-generation EGFR TKIs.

INTRODUCTION: Patients treated with third-generation EGFR TKIs will develop resistance to treatment at a certain point. Early detection of resistance occurrence could allow more options for treatment. AREAS COVERED: We discuss the development of third-generation EGFR TKIs, focusing on osimertinib and discuss the most common resistance mechanisms under evaluation. We also debate how this resistance can be detected; particularly we review the possible application of liquid biopsy in this scenario. Lastly we discuss available treatment options when resistance occurs, with an eye on ongoing trials and possible future developments. EXPERT OPINION: As resistance will ultimately develop, a strict instrumental follow-up as per international guidelines is required with the aim of detecting this resistance in an early phase. Detecting an oligoprogression could allow the integration of local ablative therapies while further delaying the need for a systemic therapy change. By exploiting the increasing potentiality of liquid biopsy, in the near future, physicians could be able to understand why a patient develops resistance and therefore can choose the best possible individualized treatment option.

Subducting serpentinites release reduced, not oxidized, aqueous fluids.

The observation that primitive arc magmas are more oxidized than mid-ocean-ridge basalts has led to the paradigm that slab-derived fluids carry SO2 and CO2 that metasomatize and oxidize the sub-arc mantle wedge. We combine petrography and thermodynamic modelling to quantify the oxygen fugacity (fO2) and speciation of the fluids generated by serpentinite dehydration during subduction. Silicate-magnetite assemblages maintain fO2 conditions similar to the quartz-fayalite-magnetite (QFM) buffer at fore-arc conditions. Sulphides are stable under such conditions and aqueous fluids contain minor S. At sub-arc depth, dehydration occurs under more reducing conditions producing aqueous fluids carrying H2S. This finding brings into question current models in which serpentinite-derived fluids are the cause of oxidized arc magmatism and has major implications for the global volatile cycle, as well as for redox processes controlling subduction zone geodynamics.

Breast cancer electron intraoperative radiotherapy: assessment of preoperative selection factors from a retrospective analysis of 758 patients and review of literature.

PURPOSE: To report our experience with full-dose 21 Gy IORT in early breast cancer patients after breast-conserving surgery to define most important selection factors. METHODS: Seven hundred and fifty eight patients, subjected to conserving surgery and IORT, were retrospectively analyzed evaluating most important clinical outcomes. RESULTS: Median follow up was 5.2 years. Results from Cox analyses defined 2 groups of patients, "suitable" (age > 50 years, non lobular histology, tumour size ≤ 2 cm, pN0 or pNmic, ki67 ≤ 20%, non triple negative receptor status and G1-G2) and "unsuitable" for IORT, with a higher rate of breast related events moving from "suitable" to "unsuitable" group. The 5 year rate of IBR is 1.8% in suitable group with significant differences versus unsuitable (1.8 vs. 11.6%, p < 0.005). Same differences between two groups were evidenced in true local relapse (0.6 vs. 6.9%, p < 0.005) and in new ipsilateral BC (1.1 vs. 4.7%, p < 0.015). CONCLUSIONS: In our current practice we consider the following preoperative factors to select patients suitable for IORT: age > 50 years, absence of lobular histology, tumor size ≤ 2 cm, pN0 or pNmic, according to APBI consensus statement, including also ki67 ≤ 20%, non triple negative receptor status and G1-G2.

[Assessment of otoacustic emissions efficiency in diagnosis of hearing loss in workers exposed to airport stressors]. / [Valutazione della validità delle emissioni otoacustiche nella diagnostica del danno uditivo in lavoratori esposti a stressor aeroportuali].

OBJECTIVES: Otoacoustic emissions are signals that originate from the cochlea, measuring them can be considered an objective method in the assessment of auditory function. In our study we wanted to examine their efficiency among normal audiological exams. MATERIALS AND METHODS: We examined 14 workers exposed to continuous aircraft noise. They underwent ENT examination, metric eardrum test, hearing test tone audiometry system powered by 1 dB, spontaneous otoacoustic emissions and evoked otoacoustic emissions. For inclusion in the study the patients had to show bilateral normoacusia at the audiometry. RESULTS: The variation of the audiometric tracks was statistically significant (p <0.05) at a frequency of 4 kHz. As to SNR parameter (relationship between sound/noise) we noticed a tendency of the transient-evoked otoacustic emission (TEOAE) to shift their spectral content, in particular a decrease in the high frequency response and on the other hand an increase at low frequencies. A similar trend for shifting in latency of otoacoustic waves emissions after exposure to chronic noise. CONCLUSIONS: The measurement of evoked transient otoacoustic emissions is well tolerated by the workers and provides objective results, so it is a more effective and objective method then the tone audiometry.

Temporal blastemal cell gene expression analysis in the kidney reveals new Wnt and related signaling pathway genes to be essential for Wilms' tumor onset.

Wilms' tumors (WTs) originate from metanephric blastema cells that are unable to complete differentiation, resulting in triphasic tumors composed of epithelial, stromal and blastemal cells, with the latter harboring molecular characteristics similar to those of the earliest kidney development stages. Precise regulation of Wnt and related signaling pathways has been shown to be crucial for correct kidney differentiation. In this study, the gene expression profile of Wnt and related pathways was assessed in laser-microdissected blastemal cells in WTs and differentiated kidneys, in human and in four temporal kidney differentiation stages (i.e. E15.5, E17.5, P1.5 and P7.5) in mice, using an orthologous cDNA microarray platform. A signaling pathway-based gene signature was shared between cells of WT and of earliest kidney differentiation stages, revealing genes involved in the interruption of blastemal cell differentiation in WT. Reverse transcription-quantitative PCR showed high robustness of the microarray data demonstrating 75 and 56% agreement in the initial and independent sample sets, respectively. The protein expression of CRABP2, IGF2, GRK7, TESK1, HDGF, WNT5B, FZD2 and TIMP3 was characterized in WTs and in a panel of human fetal kidneys displaying remarkable aspects of differentiation, which was recapitulated in the tumor. Taken together, this study reveals new genes candidate for triggering WT onset and for therapeutic treatment targets.

Causes and place of death in Italian patients with amyotrophic lateral sclerosis.

OBJECTIVES: To determine the causes and place of death in a cohort of Italian patients with amyotrophic lateral sclerosis (ALS). A better understanding of the likely causes of death in ALS might improve the palliative care at the end-of-life, whereas knowing the place of death will help to verify the need for highly specialized care services, e.g. hospice and nursing home. PATIENTS AND METHODS: Between 2000 and 2008, 182 ALS patients (onset: spinal, 127; bulbar, 55; M/F: 1.6) were followed in a single ALS Tertiary Centre in Palermo, Sicily, Italy until death. Medical data for each individual patient were recorded in a large database throughout the disease course. Information concerning causes and place of death were obtained by consultation with relatives or the family physician. RESULTS: Respiratory failure (terminal respiratory insufficiency, pneumonia) was the most frequent cause of death (81.3%), which included six cases (3.3%) who requested a terminal sedation. Sudden death and death during sleep accounted for by 6.0% and 6.6% of all deaths, respectively. Heart-related causes of death were relatively infrequent in our cohort, accounting for by 7.1% of all deaths (i.e. sudden death: 6.0% and myocardial infarct: 1.1%). Patients (85.2%) died at home. CONCLUSIONS: The leading cause of death in ALS remains the respiratory failure, followed by the sudden death and death during sleep. Most patients in our cohort died at home, a choice that might be only partially driven by cultural factors. These findings might have a great impact on the development of the advanced and end-of-life palliative care and in the planning of specialized care services, as hospice and nursing home.

Multidisciplinary approach for in-deep assessment of joint prosthesis failure.

In spite of advancement in biomaterials and biomechanics, in development of new osteo-integrative materials and coatings, and in macro- micro- component design, a non negligible fraction of the implanted prosthesis fails before the expected lifetime. A prospective observational clinical study has been conducted to define and apply a set of experimental techniques to in-deep assess the failure of joint prosthesis. Microbiological, histological and micro-structural techniques were implemented to specifically address phenomena occurring at the tissue-implant interface. Results obtained from 27 cases of prosthetic joint failure are discussed in terms of sensitivity and specificity. A procedural flow-chart is finally proposed for the assessment of joint prosthesis failure.

[Extra-auditory effects of noise]. / Effetti extrauditivi del rumore.

In the last thirty years, several studies have demonstrated a correlation between exposure to noise and the development of alterations and/or pathologies in organs and apparatus, apart from the auditory one. Exposure to noise can induce biochemical, physiological, or psychosocial modifications that can remain either inside the range of biological normality or alter and compromise the psychophysical well-being of the individual depending on the extent of the functional alterations of organic systems and psychosocial functions; both the reversibility and duration of the alterations and the adaptation could be related to the recovery capabilitiy of the human organism and to the environmental condition. Among the factors that can influence the effects of noise we can find: intrinsic characteristics of the physical insult (pressure, sound intensity, emission frequency), extrinsic characteristics (duration of the exposure, way of emission, presence of impulsive components, masking effects), spectral characteristics (infrasounds, ultrasounds, time of recovery) genetic factors (susceptibility) and acquired factors of the human organism (acoustic isolation of the living houses and the social necessity for the industrial activities that generate noise). Other factors that influence the damage are the surprise effect, the semantic content and the identification of the noise source. It can be hypothesized that the extra-auditory effects of noise show themselves through a series of nervous circuits that use the autonomic nervous system and interfere on neuro-immune-endocrine parameters. The organs which are more studied are: cardiovascular, gastro-enteric and endocrine systems, nervous system and psychological effects, respiratory system, fetus and effects on reproductive system, immune system and genetic material.

Cerebrospinal fluid tau protein is not a biological marker in amyotrophic lateral sclerosis.

BACKGROUND: Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disorder leading to progressive motor neuron cell death. Etiopathogenesis is still imperfectly known and much effort have been undertaken to find a biological marker that could help in the early diagnosis and in the monitoring of disease progression. Cerebrospinal fluid (CSF) concentrations of tau, an axonal microtubule-associated protein, have been measured in ALS with levels found increased in some studies and unchanged in others. METHODS: Total CSF tau level was assayed in a population of ALS patients (n = 57) and controls (n = 110) using a specific ELISA method. RESULTS: No significant differences in the median CSF tau levels between ALS cases and controls were found [ALS: 126 pg/ml (78-222); controls: 112 pg/ml (71-188), P = ns]. In the ALS group, the bulbar-onset patients showed increased CSF tau levels as compared with the spinal-onset cases. These differences might be related to the higher age of the bulbar-onset patients. Further, no correlations were found between CSF tau concentrations and the rate of progression of the disease. CONCLUSIONS: These results do not support the hypothesis that total CSF tau protein is a reliable biological marker for ALS.

Dysembryoplastic neuroepithelial tumor of the brainstem.

Dysembryoplastic neuroepithelial tumor (DNT) is a clinically benign stable lesion, most frequently located in the temporal and frontal lobes, often responsible for epilepsy in young adults. We describe an unusual case of DNT in the brainstem of a 45-year-old woman. Brain MRI showed a multicystic-like lesion localized in the left inferior pons, involving the ipsilateral cerebellar peduncle and partially dislocating the fourth ventricle. The specific pattern of MRI and CT appearance of DNT and its benign course (our patient is clinically stable with unchanged MRI images at two year follow-up) may help differentiate this tumor from other lesions, i.e. gangliogliomas and glioneural malformations.

Telephone follow-up for patients with amyotrophic lateral sclerosis.

The relentless evolution of amyotrophic lateral sclerosis (ALS), a severe neurodegenerative disorder of the upper and lower motoneurons, leads to an increasing level of disability. Most patients, during the course of the disease, become unable to attend the tertiary clinical care center and are thus prevented from enrolling in clinical trials or benefiting from specialized care and management. The main objective of this study was to verify whether the ALS functional rating scale (ALSFRS) could be reliably administered by telephone to patients, when unable to attend the ALS clinic, or to their caregivers. ALSFRS is a validated instrument that assesses the functional status and the disease progression in ALS. We first administered the functional rating scale directly in the clinic to 30 patients, with definite or probable ALS, and to their respective caregivers, and found a very high agreement between the two groups for the total score and the majority of the rating items. Next, we showed, in both patients and caregivers, a high degree of correlation between the total score of the ALSFRS measured by telephone and that reported in the clinic. This indicates that ALSFRS is a reliable instrument for monitoring the disease progression in homebound patients, even when the person contacted by telephone is the caregiver. We also performed a telephone clinic, based on an unstructured interview, with 16 ALS patients at an advanced stage of the disease and unable to attend the ALS clinic. On some occasions, the person interviewed was the caregiver. The symptoms most frequently reported were a worsening of muscle strength, swallowing and breathing problems, constipation, and inability to clear lung secretions. Several patients asked for assistive and adaptive equipment. All patients and caregivers found the telephone clinic very useful and considered it a good complement to the management and care programme.

[Night workers and plasmatic cortisol]. / Lavoratori notturni e cortisolo plasmatico.

The aim of the study is to evaluate whether occupational exposure to night work could cause alterations in the levels of plasmatic cortisol. The interest toward this argument arises form several studies in scientific literature referring the presence of an alteration in the synthesis and release of cortisol in workers exposed to night work. We studied a population of workers employed in night security service and monitoring service of alarm systems in different museums compared to a control group not performing shift-work and/or night work. The exposed and control subjects were compared by age, length of service, smoking habit (n. cigarettes per day), habitual consumption of alcoholic drinks (n. glass of wine/beer per day). We evaluated the levels of plasmatic cortisol on 50 workers exposed to night work, all males of whom 30 smokers and 20 non-smokers and on 50 controls of whom 30 smokers and 20 non-smokers.

Noninvasive positive-pressure ventilation in ALS: predictors of tolerance and survival.

OBJECTIVE: To identify factors associated with tolerance and survival after noninvasive positive-pressure ventilation (NIPPV) and to investigate the influence of NIPPV on lung function in patients with ALS. METHODS: NIPPV was offered to 71 patients with ALS in accordance with currently published guidelines. Effects of NIPPV on lung function and factors influencing tolerance and survival after NIPPV were studied. RESULTS: Forty-four patients (61.9%; 95% CI: 50.6 to 73.2) tolerated NIPPV (NIPPV use >or=4 h/day) and 27 (38.1%; 95% CI: 26.8 to 49.4) were intolerant (NIPPV use <4 h/day). Patients with mild or moderate bulbar symptoms were more likely to tolerate NIPPV than those with severe impairment (odds ratio = 6.09, 95% CI: 1.18 to 31.52, p = 0.031). After NIPPV introduction, a slower decline in forced vital capacity (FVC) was observed in tolerant vs intolerant patients (p = 0.002). The slope of FVC decline after NIPPV initiation (risk ratio [RR]: 0.78, 95% CI: 0.65 to 0.94, p = 0.01) together with NIPPV tolerance (RR: 0.32, 95% CI: 0.13 to 0.78, p = 0.013) were the only independent predictors of survival in the overall group of patients. In multivariate analysis, body mass index was the most powerful predictor of longer survival after NIPPV in tolerant patients (RR: 0.77, 95% CI: 0.61 to 0.96, p = 0.022). CONCLUSION: Survival after noninvasive ventilation was independently related to ventilatory use (>or=4 h/day) and to the modifications of forced vital capacity decline after treatment initiation. The severity of bulbar impairment and the nutritional status of the ALS patients at the introduction of ventilation may predict tolerance and survival.

A novel mutation (Thr116Ile) in the presenilin 1 gene in a patient with early-onset Alzheimer's disease.

We report a novel presenilin 1 (PSN1) mutation (Thr116Ile) in a woman with early onset Alzheimer's disease (AD). This mutation was not found in 100 healthy controls, indicating that this is not a common polymorphism. The patient presented with forgetfulness at age 45, followed over the next 3 years by a worsening of the memory loss and frequent episodes of confusion and spatial disorientation. Neuroimaging studies were consistent with AD. The analysis of the family's pedigree showed that the proband was apparently the only member affected. Because the early death of several close relatives (i.e. the mother and the grandmother) and the demonstration that the father is not a mutation carrier, it is suggested that either a de novo mutation or a censor effect might have occurred. Our finding supports the indication that PSN1 mutations should be searched for in early-onset AD, particularly when a censor effect precludes a precise genetic analysis.

Association of CYP3A4 genotype with detection of Vy/JB trans-rearrangements in the peripheral blood leukocytes of pediatric cancer patients undergoing chemotherapy for all

Cancer patients receiving chemotherapy are exposed to high doses of cytotoxic and genotoxic drugs which, in some cases, can lead to treatment related leukemia. Since this only occurs in a minority of patients, however, it is possible some individuals are predisposed due to genetic polymorphisms in genes for enzymes that mediate drug metabolism. To address this possibility we measured the genotoxicity of chemotherapeutic agents in patients receiving treatment for ALL by the frequency of the Vã/Jâ trans-rearrangement in their peripheral blood leukocytes and compared this with CYP3A4 genotype. CYP3A4 is the most abundant of the cytochrome P450 (CYP) enzyme in the liver and intestine which contains a common −392A>G substitution in the promoter region (CYP3A4*1B allele). We found a significant increase in the frequency of rearrangements during chemotherapy only in patients homozygous for the wild type CYP3A4*1A allele. This provides a direct link between CYP3A4 genotype and susceptibility to drug genotoxicity thus strengthening the possibility that predisposition to treatment related leukemia may be measurable by simple genetic testing.

Legal and assistance aspects of Alzheimer's disease: analysis of 100 cases.

Caring for patients with disabling cognitive diseases, such as Alzheimer's disease (AD) and other progressive dementias, has a number of legal and social welfare implications. The two main problems to be discussed with patients and caregivers are the need for a legal guardian and requests for government financial support, both of which depend on the patient's progressive loss of autonomy and increasing need for assistance. In order to study the presence of these two support measures, we considered 100 AD patients (56 women and 44 men) divided in four groups on the basis of the stage of the disease: mild (25), moderate (34) and severe (32), or death (9). We investigated the number of caregivers for each patient (and their relationship with the patient), the presence of a legal guardian, and whether government financial support had been obtained. The number of caregivers increased for each patient as the disease advanced (54% with moderate and 67% with severe disease had > or =1 caregiver), but only 11% of the patients had a guardian. The caregivers were most likely to be family members (70% were spouses, 45% offspring). Only 23% of the patients with moderate and 62% with severe disease received government financial support. Our data concerning the care of incompetent people (as AD patients progressively become) in juridical (guardianship/trusteeship/proxy/power of attorney) and social terms (government financial support) show that such aspects are not sufficiently taken into account until the patients reach a severe disease or have died.

Cognitive impairment in patients suffering from relapsing-remitting multiple sclerosis with EDSS < or = 3.5.

OBJECTIVES: Previous papers have mainly demonstrated the presence and the frequency of cognitive impairment in patients suffering from relapsing-remitting multiple sclerosis. The purpose of this study was to investigate subjects with the relapsing-remitting form of the disease and mild clinical disability (EDSS < or = 3.5), so as to quantify this deficit when the illness does not yet interfere with daily living and the ability to work. METHODS: Fifty patients and 50 healthy controls were submitted to a wide neuropsychological battery, including Wechsler Memory Scale I- (WMS), Benton Visual Retention Test D- (BVRT), Raven Coloured Progressive Matrices (RCPM), Kohs' test (KT), Judgement of Lines Orientation H- (JLO), Facial Recognition (FR) and Aachner Aphasie Test (AAT). They also underwent Clinical Depression Scale (CDQ) and State-Trait Anxiety Inventory (STAI). RESULTS: The results show the presence of significant memory impairment on both WMS (P = 0.000) and BVRT (P = 0.000) in patients compared with controls. Patients were also impaired in abstract reasoning and problem-solving deficit (KT P = 0.003; RCPM P = 0.000) and in FR (P = 0.019). Cognitive decline correlated with illness duration (r = 0.761), but was independent of EDSS (r = 0.085). CONCLUSION: Cognitive decline was present even when physical disability was not yet severe, but it was mild and did not limit patients' ability to work. The cognitive impairment outlined was of the subcortical type and correlated with illness duration. This study emphasizes the importance of cognitive examination in clinical practice. It is suggested that a complete neurological examination include tests on memory and abstract reasoning.