33 research outputs found
Prevalence of deleterious germline variants in risk genes including BRCA1/2 in consecutive ovarian cancer patients (AGO-TR-1)
Background Identification of families at risk for ovarian cancer offers the
opportunity to consider prophylactic surgery thus reducing ovarian cancer
mortality. So far, identification of potentially affected families in Germany
was solely performed via family history and numbers of affected family members
with breast or ovarian cancer. However, neither the prevalence of deleterious
variants in BRCA1/2 in ovarian cancer in Germany nor the reliability of family
history as trigger for genetic counselling has ever been evaluated. Methods
Prospective counseling and germline testing of consecutive patients with
primary diagnosis or with platinum-sensitive relapse of an invasive epithelial
ovarian cancer. Testing included 25 candidate and established risk genes.
Among these 25 genes, 16 genes (ATM, BRCA1, BRCA2, CDH1, CHEK2, MLH1, MSH2,
MSH6, NBN, PMS2, PTEN, PALB2, RAD51C, RAD51D, STK11, TP53) were defined as
established cancer risk genes. A positive family history was defined as at
least one relative with breast cancer or ovarian cancer or breast cancer in
personal history. Results In total, we analyzed 523 patients: 281 patients
with primary diagnosis of ovarian cancer and 242 patients with relapsed
disease. Median age at primary diagnosis was 58 years (range 16–93) and 406
patients (77.6%) had a high-grade serous ovarian cancer. In total, 27.9% of
the patients showed at least one deleterious variant in all 25 investigated
genes and 26.4% in the defined 16 risk genes. Deleterious variants were most
prevalent in the BRCA1 (15.5%), BRCA2 (5.5%), RAD51C (2.5%) and PALB2 (1.1%)
genes. The prevalence of deleterious variants did not differ significantly
between patients at primary diagnosis and relapse. The prevalence of
deleterious variants in BRCA1/2 (and in all 16 risk genes) in patients <60
years was 30.2% (33.2%) versus 10.6% (18.9%) in patients ≥60 years. Family
history was positive in 43% of all patients. Patients with a positive family
history had a prevalence of deleterious variants of 31.6% (36.0%) versus 11.4%
(17.6%) and histologic subtype of high grade serous ovarian cancer versus
other showed a prevalence of deleterious variants of 23.2% (29.1%) and 10.2%
(14.8%), respectively. Testing only for BRCA1/2 would miss in our series more
than 5% of the patients with a deleterious variant in established risk genes.
Conclusions 26.4% of all patients harbor at least one deleterious variant in
established risk genes. The threshold of 10% mutation rate which is accepted
for reimbursement by health care providers in Germany was observed in all
subgroups analyzed and neither age at primary diagnosis nor histo-type or
family history sufficiently enough could identify a subgroup not eligible for
genetic counselling and testing. Genetic testing should therefore be offered
to every patient with invasive epithelial ovarian cancer and limiting testing
to BRCA1/2 seems to be not sufficient
Treatment of blunt thoracic aortic injury in Germany—Assessment of the TraumaRegister DGU®
Purpose Using the data delivered by the German Trauma Register DGU® from 2002
till 2013, the value of different therapies of blunt thoracic aortic injury
(BTAI) in Germany was analyzed. Methods Prospectively collected data of
patients suffering from BTAI were retrospectively analyzed with focus on the
different treatment modalities for grade I–IV injuries. Results 821 patients
suffering from BTAI were identified: 51.6% (424) grade I injury, 35.4% (291)
grade II or III injury and 12.9% (106) grade IV injury (77.5% men [44.94 ±
20.6 years]). The main patterns of injury were high- speed accidents and falls
(78.0% [n = 640], 21.8% [n = 171] respectively). Significant differences
between grade I and grade II/III as well as IV injuries could be assessed for
the incidence of cardiopulmonary resuscitation, a Glasgow Coma Scale score
below 8 and a systolic blood pressure below 90 mmHg (p-value: <0.001). In the
primary admission subgroup, 44.1% (197/447) of the patients received best
medical treatment, 55.9% received surgical intervention (250/447): Thereof
37.2% (93/250) received open surgery and 62.8% (147/250) had been treated by
endovascular means. Significantly lower 24-h- and in-hospital-mortality rates
were encountered after endovascular treatment for all gradings of BTAI
(p-value: <0.001). Yet this subgroup of patients showed the lowest incidence
of further severe injuries and cardiac arrest. Conclusion Endovascular therapy
became the treatment of choice for BTAI in Germany. Patients who have been
treated by surgical means showed the highest survival rate, especially
endovascular therapy showed a favorable low mortality rate
Sequential conformational transitions and α-helical supercoiling regulate a sensor histidine kinase
Sensor histidine kinases are central to sensing in bacteria and in plants.
They usually contain sensor, linker, and kinase modules and the structure of
many of these components is known. However, it is unclear how the kinase
module is structurally regulated. Here, we use nano- to millisecond time-
resolved X-ray scattering to visualize the solution structural changes that
occur when the light-sensitive model histidine kinase YF1 is activated by blue
light. We find that the coiled coil linker and the attached histidine kinase
domains undergo a left handed rotation within microseconds. In a much slower
second step, the kinase domains rearrange internally. This structural
mechanism presents a template for signal transduction in sensor histidine
kinases
The Bose-Einstein correlation function from a Quantum Field Theory point of view
We show that a recently proposed derivation of Bose-Einstein correlations
(BEC) by means of a specific version of thermal Quantum Field Theory (QFT),
supplemented by operator-field evolution of the Langevin type, allows for a
deeper understanding of the possible coherent behaviour of the emitting source
and a clear identification of the origin of the observed shape of the BEC
function . Previous conjectures in this matter obtained by other
approaches are confirmed and have received complementary explanation.Comment: Some misprints corrected. To be publishe in Phys. Rev.
Incremental value of biomarker combinations to predict progression of mild cognitive impairment to Alzheimer’s dementia
Background The progression of mild cognitive impairment (MCI) to Alzheimer’s
disease (AD) dementia can be predicted by cognitive, neuroimaging, and
cerebrospinal fluid (CSF) markers. Since most biomarkers reveal complementary
information, a combination of biomarkers may increase the predictive power. We
investigated which combination of the Mini-Mental State Examination (MMSE),
Clinical Dementia Rating (CDR)-sum-of-boxes, the word list delayed free recall
from the Consortium to Establish a Registry of Dementia (CERAD) test battery,
hippocampal volume (HCV), amyloid-beta1–42 (Aβ42), amyloid-beta1–40 (Aβ40)
levels, the ratio of Aβ42/Aβ40, phosphorylated tau, and total tau (t-Tau)
levels in the CSF best predicted a short-term conversion from MCI to AD
dementia. Methods We used 115 complete datasets from MCI patients of the
“Dementia Competence Network”, a German multicenter cohort study with annual
follow-up up to 3 years. MCI was broadly defined to include amnestic and
nonamnestic syndromes. Variables known to predict progression in MCI patients
were selected a priori. Nine individual predictors were compared by receiver
operating characteristic (ROC) curve analysis. ROC curves of the five best
two-, three-, and four-parameter combinations were analyzed for significant
superiority by a bootstrapping wrapper around a support vector machine with
linear kernel. The incremental value of combinations was tested for
statistical significance by comparing the specificities of the different
classifiers at a given sensitivity of 85%. Results Out of 115 subjects, 28
(24.3%) with MCI progressed to AD dementia within a mean follow-up period of
25.5 months. At baseline, MCI-AD patients were no different from stable MCI in
age and gender distribution, but had lower educational attainment. All single
biomarkers were significantly different between the two groups at baseline.
ROC curves of the individual predictors gave areas under the curve (AUC)
between 0.66 and 0.77, and all single predictors were statistically superior
to Aβ40. The AUC of the two-parameter combinations ranged from 0.77 to 0.81.
The three-parameter combinations ranged from AUC 0.80–0.83, and the four-
parameter combination from AUC 0.81–0.82. None of the predictor combinations
was significantly superior to the two best single predictors (HCV and t-Tau).
When maximizing the AUC differences by fixing sensitivity at 85%, the two- to
four-parameter combinations were superior to HCV alone. Conclusion A
combination of two biomarkers of neurodegeneration (e.g., HCV and t-Tau) is
not superior over the single parameters in identifying patients with MCI who
are most likely to progress to AD dementia, although there is a gradual
increase in the statistical measures across increasing biomarker combinations.
This may have implications for clinical diagnosis and for selecting subjects
for participation in clinical trials
Nonperturbative Effects in Gluon Radiation and Photoproduction of Quark Pairs
We introduce a nonperturbative interaction for light-cone fluctuations
containing quarks and gluons. The interaction squeezes the transverse
size of these fluctuations in the photon and one does not need to simulate this
effect via effective quark masses. The strength of this interaction is fixed by
data. Data on diffractive dissociation of hadrons and photons show that the
nonperturbative interaction of gluons is much stronger. We fix the parameters
for the nonperturbative quark-gluon interaction by data for diffractive
dissociation to large masses (triple-Pomeron regime). This allows us to predict
nuclear shadowing for gluons which turns out to be not as strong as
perturbative QCD predicts. We expect a delayed onset of gluon shadowing at shadowing of quarks. Gluon shadowing turns out to be nearly scale
invariant up to virtualities due to presence of a semihard
scale characterizing the strong nonperturbative interaction of gluons. We use
the same concept to improve our description of gluon bremsstrahlung which is
related to the distribution function for a quark-gluon fluctuation and the
interaction cross section of a fluctuation with a nucleon. We expect
the nonperturbative interaction to suppress dramatically the gluon radiation at
small transverse momenta compared to perturbative calculations.Comment: 58 pages of Latex including 11 figures. Shadowing for soft gluons and
Fig. 6 are added as well as a few reference
Global maps of soil temperature.
Research in global change ecology relies heavily on global climatic grids derived from estimates of air temperature in open areas at around 2 m above the ground. These climatic grids do not reflect conditions below vegetation canopies and near the ground surface, where critical ecosystem functions occur and most terrestrial species reside. Here, we provide global maps of soil temperature and bioclimatic variables at a 1-km <sup>2</sup> resolution for 0-5 and 5-15 cm soil depth. These maps were created by calculating the difference (i.e. offset) between in situ soil temperature measurements, based on time series from over 1200 1-km <sup>2</sup> pixels (summarized from 8519 unique temperature sensors) across all the world's major terrestrial biomes, and coarse-grained air temperature estimates from ERA5-Land (an atmospheric reanalysis by the European Centre for Medium-Range Weather Forecasts). We show that mean annual soil temperature differs markedly from the corresponding gridded air temperature, by up to 10°C (mean = 3.0 ± 2.1°C), with substantial variation across biomes and seasons. Over the year, soils in cold and/or dry biomes are substantially warmer (+3.6 ± 2.3°C) than gridded air temperature, whereas soils in warm and humid environments are on average slightly cooler (-0.7 ± 2.3°C). The observed substantial and biome-specific offsets emphasize that the projected impacts of climate and climate change on near-surface biodiversity and ecosystem functioning are inaccurately assessed when air rather than soil temperature is used, especially in cold environments. The global soil-related bioclimatic variables provided here are an important step forward for any application in ecology and related disciplines. Nevertheless, we highlight the need to fill remaining geographic gaps by collecting more in situ measurements of microclimate conditions to further enhance the spatiotemporal resolution of global soil temperature products for ecological applications