206 research outputs found
Characterization of irradiated RD53A pixel modules with passive CMOS sensors
We are investigating the feasibility of using CMOS foundries to fabricate
silicon detectors, both for pixels and for large-area strip sensors. The
availability of multi-layer routing will provide the freedom to optimize the
sensor geometry and the performance, with biasing structures in poly-silicon
layers and MIM-capacitors allowing for AC coupling. A prototyping production of
strip test-structures and RD53A compatible pixel sensors was recently completed
at LFoundry in a 150nm CMOS process. This paper will focus on the
characterization of irradiated and non-irradiated pixel modules, composed by a
CMOS passive sensor interconnected to a RD53A chip. The sensors are designed
with a pixel cell of in case of DC coupled
devices and for the AC coupled ones. Their
performance in terms of charge collection, position resolution, and hit
efficiency was studied with measurements performed in the laboratory and with
beam tests. The RD53A modules with LFoundry silicon sensors were irradiated to
fluences up to
Oxygen isotopic ratios in galactic clouds along the line of sight towards Sagittarius B2
As an independent check on previous measurements of the isotopic abundance of
oxygen through the Galaxy, we present a detailed analysis of the ground state
rotational lines of 16OH and 18OH in absorption towards the giant molecular
cloud complex, Sagittarius B2. We have modelled the line shapes to separate the
contribution of several galactic clouds along the line of sight and calculate
16OH/18OH ratios for each of these features. The best fitting values are in the
range 320-540, consistent with the previous measurements in the Galactic Disk
but slightly higher than the standard ratio in the Galactic Centre. They do not
show clear evidence for a gradient in the isotopic ratio with galactocentric
distance. The individual 16OH column densities relative to water give ratios of
[H2O/OH]=0.6-1.2, similar in magnitude to galactic clouds in the sight lines
towards W51 and W49. A comparison with CH indicates [OH/CH] ratios higher than
has been previously observed in diffuse clouds. We estimate OH abundances of
10^-7 - 10^-6 in the line of sight features.Comment: 10 pages, 6 figures, accepted for publication in A&
Bevacizumab continuation versus no continuation after first-line chemotherapy plus bevacizumab in patients with metastatic colorectal cancer: a randomized phase III non-inferiority trial (SAKK 41/06)
In this trial, stopping bevacizumab after completion of induction chemotherapy was associated with a shorter time to progression, but no statistically significant difference in overall survival compared with the bevacizumab continuation strategy. Non-inferiority could not be demonstrated. Treatment costs are substantially higher for continuous bevacizumab treatmen
The use of thermographic imaging to evaluate therapeutic response in human tumour xenograft models
YesNon-invasive methods to monitor tumour growth are an important goal in cancer drug development. Thermographic imaging systems offer potential in this area, since a change in temperature is known to be induced due to changes within the tumour microenvironment. This study demonstrates that this imaging modality can be applied to a broad range of tumour xenografts and also, for the first time, the methodology’s suitability to assess anti-cancer agent efficacy. Mice bearing subcutaneously implanted H460 lung cancer xenografts were treated with a novel vascular disrupting agent, ICT-2552, and the cytotoxin doxorubicin. The effects on tumour temperature were assessed using thermographic imaging over the first 6 hours post-administration and subsequently a further 7 days. For ICT-2552 a significant initial temperature drop was observed, whilst for both agents a significant temperature drop was seen compared to controls over the longer time period. Thus thermographic imaging can detect functional differences (manifesting as temperature reductions) in the tumour response to these anti-cancer agents compared to controls. Importantly, these effects can be detected in the first few hours following treatment and therefore the tumour is observable non-invasively. As discussed, this technique will have considerable 3Rs benefits in terms of reduction and refinement of animal use.University of Bradfor
Neoadjuvant chemoradiotherapy with or without panitumumab in patients with wild-type KRAS, locally advanced rectal cancer (LARC): a randomized, multicenter, phase II trial SAKK 41/07
Background We conducted a randomized, phase II, multicenter study to evaluate the anti-epidermal growth factor receptor (EGFR) mAb panitumumab (P) in combination with chemoradiotherapy (CRT) with standard-dose capecitabine as neoadjuvant treatment for wild-type KRAS locally advanced rectal cancer (LARC). Patients and methods Patients with wild-type KRAS, T3-4 and/or N+ LARC were randomly assigned to receive CRT with or without P (6 mg/kg). The primary end-point was pathological near-complete or complete tumor response (pNC/CR), defined as grade 3 (pNCR) or 4 (pCR) histological regression by Dworak classification (DC). Results Forty of 68 patients were randomly assigned to P + CRT and 28 to CRT. pNC/CR was achieved in 21 patients (53%) treated with P + CRT [95% confidence interval (CI) 36%-69%] versus 9 patients (32%) treated with CRT alone (95% CI: 16%-52%). pCR was achieved in 4 (10%) and 5 (18%) patients, and pNCR in 17 (43%) and 4 (14%) patients. In immunohistochemical analysis, most DC 3 cells were not apoptotic. The most common grade ≥3 toxic effects in the P + CRT/CRT arm were diarrhea (10%/6%) and anastomotic leakage (15%/4%). Conclusions The addition of panitumumab to neoadjuvant CRT in patients with KRAS wild-type LARC resulted in a high pNC/CR rate, mostly grade 3 DC. The results of both treatment arms exceeded prespecified thresholds. The addition of panitumumab increased toxicit
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