56 research outputs found
Neoadjuvant treatment in oesophageal cancer: The needs for future trials
In view of the poor survival after surgery alone for oesophageal cancer, combination with chemotherapy seems rational. A concept of upfront chemotherapy is discussed and seems especially useful for these tumours. The published randomized trials, studying the effect of neoadjuvant chemotherapy do, however, not (yet) show an improved overall survival, apart from one study with a significant median survival benefit at an interim evaluation. The responding patients have in all trials a far better survival than the non-responders. The numbers of patients are small and results of other ongoing and future trials should be awaited. New trials testing high-dose chemotherapy with bone marrow support should be initiated
Chemotherapy in cancer of the esophagus
Al though cancer of the esophagus has been recogni zed as a
fatal disease as long ago as the start of the Christian era,
the present outlook remains dismal. Less than 10 percent of
patients with seemingly localized disease, surgically treated
with curative intent, will survive five years or more. Dysphagia,
the initial symptom in most patients, usually occurs late
in the course of the disease, when the esophageal wall has
been infiltrated or penetrated. At this time, in the majority
of patients, metastases are present in surrounding lymphe
nodes and/or other organs.
Until recently, chemotherapy had no role in the treatment of
this disease. It was generally used as a last resort I after
primary surgery or radiation therapy, in patients with a poor
performance status. With the availability of new drugs, used
in various combinations, and sometimes in conjunction with
other forms of cancer treatment, a modest success is standing
out against the horizon.
This thesis includes an overview of the current knowledge on
chemotherapy in esophageal cancer (chapter 1), several clinical
studies on the efficacy and toxicity of various drugs and
combinations of drugs in metastatic esophageal cancer (chapters
2-5), a comparative study on preoperative chemotherapy in
patients with operable esophageal cancer (chapter 6) I and an
exploratory study,
after chemotherapy
to evaluate the benefit of
(chapter 7) in patients
salvage surgery
with metastatic
esophageal cancer. In addition, two laboratory experiments on
the presence of human papilloma virus and the role of the
Multidrug Resistance Protein in esophageal cancer are covered
(chapters 8,9)
Conditional linear-optical measurement schemes generate effective photon nonlinearities
We provide a general approach for the analysis of optical state evolution
under conditional measurement schemes, and identify the necessary and
sufficient conditions for such schemes to simulate unitary evolution on the
freely propagating modes. If such unitary evolution holds, an effective photon
nonlinearity can be identified. Our analysis extends to conditional measurement
schemes more general than those based solely on linear optics.Comment: 16 pages, 2 figure
Ifosfamide in advanced adenocarcinoma of the oesophagus or oesophageal-gastric junction area
Abstract
25 previously untreated patients with inoperable or metastatic adenocarcinoma of the oesophagus or oesophageal-gastric junction area were treated with ifosfamide 6 g/m2 over 48 hours, combined with mesna 6 g/m2. 1 complete response and 1 partial response were seen among 23 patients evaluable, with a response duration of 29+ months and 7 months, respectively. Toxicity was not severe: grade 3 infection in 2 patients, grade 3 leucopenia in 3 patients and grade 3 nausea in 4 patients. No life-threatening episodes or central nervous system toxicity were encountered. Ifosfamide has limited activity in adenocarcinoma of the oesophageal-gastric junction area
Disease monitoring by the tumour maskers Cyfra 21.1 and TPA in patients with non-small cell lung cancer
We evaluated the use of two tumour markers Cyfra 21.1 and tissue polypeptide antigen (TPA) for disease monitoring. Assessment of response to WHO criteria was compared to response assessment according to changes in the tumour marker levels. The criteria defined for marker response were a 65% decrease for a partial response and a 40% increase for progressive disease. When response evaluations with a positive lead time were included, 72% of 115 evaluations for Cyfra 21.1 and 59% of 107 evaluations for TPA yielded the same result. Most discordant evaluations were caused by those evaluations whereby the patient achieved a partial response according to the WHO criteria and had normalisation of the marker. Less cases with a positive lead time, more negative lead times, and more patients with progressive disease without an increase of the marker were seen with TPA compared to Cyfra 21.1. In conclusion, Cyfra 21.1 follows the changes in the tumour load better than TPA. Rising levels of both markers nearly always indicate disease progression, and such knowledge easily obtained may prevent the continuation of ineffective treatment
Creation of maximally entangled photon-number states using optical fiber multiports
We theoretically demonstrate a method for producing the maximally
path-entangled state (1/Sqrt[2]) (|N,0> + exp[iN phi] |0,N>) using
intensity-symmetric multiport beamsplitters, single photon inputs, and either
photon-counting postselection or conditional measurement. The use of
postselection enables successful implementation with non-unit efficiency
detectors. We also demonstrate how to make the same state more conveniently by
replacing one of the single photon inputs by a coherent state.Comment: 4 pages, 1 figure. REVTeX4. Replaced with published versio
Prognostic significance of tissue polypeptidespecific antigen (TPS) in patients with advanced non-small cell lung cancer
In this study, we evaluated the prognostic value of the tumour marker, tissue polypeptide-specific antigen (TPS), in 203 patients with non-small cell lung cancer (NSCLC), and related this to several other known prognostic factors. TPS was significantly correlated with lactate dehydrogenase (LDH), γ-glutamyltranspeptidase and alkaline phosphatase, and the median level of TPS in patients with stage 4 disease was significantly higher as compared to stage 3A and 3B disease. In the univariate analysis, performance status, stage of disease, LDH, alkaline phosphatase, a histology of undifferentiated large cell carcinoma and TPS all had a statistically significant association with survival. Multivariate analysis showed that stage of disease, performance status, histology and TPS were the most important prognostic factors. TPS has prognostic significance for survival in patients with advanced NSCLC, independent from performance status and stage of disease
Demonstration of Feed-Forward Control for Linear Optics Quantum Computation
One of the main requirements in linear optics quantum computing is the
ability to perform single-qubit operations that are controlled by classical
information fed forward from the output of single photon detectors. These
operations correspond to pre-determined combinations of phase corrections and
bit-flips that are applied to the post-selected output modes of
non-deterministic quantum logic devices. Corrections of this kind are required
in order to obtain the correct logical output for certain detection events, and
their use can increase the overall success probability of the devices. In this
paper, we report on the experimental demonstration of the use of this type of
feed-forward system to increase the probability of success of a simple
non-deterministic quantum logic operation from approximately 1/4 to 1/2. This
logic operation involves the use of one target qubit and one ancilla qubit
which, in this experiment, are derived from a parametric down-conversion photon
pair. Classical information describing the detection of the ancilla photon is
fed-forward in real-time and used to alter the quantum state of the output
photon. A fiber optic delay line is used to store the output photon until a
polarization-dependent phase shift can be applied using a high speed Pockels
cell
Chemotherapy Followed by Surgery versus Surgery Alone in Patients with Resectable Oesophageal Squamous Cell Carcinoma: Long-term Results of a Randomized Controlled Trial
Conditional generation of arbitrary multimode entangled states of light with linear optics
We propose a universal scheme for the probabilistic generation of an
arbitrary multimode entangled state of light with finite expansion in Fock
basis. The suggested setup involves passive linear optics, single photon
sources, strong coherent laser beams, and photodetectors with single-photon
resolution. The efficiency of this setup may be greatly enhanced if, in
addition, a quantum memory is available.Comment: 7 pages, 5 figure
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