keyword
MENU ▼
Read by QxMD icon Read
search

model-based model-free

keyword
https://www.readbyqxmd.com/read/28822813/reinforcement-learning-based-control-of-drug-dosing-for-cancer-chemotherapy-treatment
#1
Regina Padmanabhan, Nader Meskin, Wassim M Haddad
The increasing threat of cancer to human life and the improvement in survival rate of this disease due to effective treatment has promoted research in various related fields. This research has shaped clinical trials and emphasized the necessity to properly schedule cancer chemotherapy to ensure effective and safe treatment. Most of the control methodologies proposed for cancer chemotherapy scheduling treatment are model-based. In this paper, a reinforcement learning (RL)-based, model-free method is proposed for the closed-loop control of cancer chemotherapy drug dosing...
August 16, 2017: Mathematical Biosciences
https://www.readbyqxmd.com/read/28821938/depth-of-response-predicts-the-clinical-outcome-of-advanced-her2-positive-gastric-cancer-to-trastuzumab-based-first-line-chemotherapy
#2
Shigenori Kadowaki, Toshiki Masuishi, Tetsuya Eto, Yukiya Narita, Hiroya Taniguchi, Takashi Ura, Masashi Ando, Masahiro Tajika, Yasumasa Niwa, Yasushi Yatabe, Kei Muro
PURPOSE: Accumulating evidence suggests that response-related parameters such as depth of response (DpR) might be associated with survival in colorectal cancer, which has not been shown in gastric cancer. This study aimed to evaluate whether DpR was associated with clinical outcomes in HER2-positive AGC patients treated with trastuzumab-based chemotherapy. METHODS: Fifty-seven HER2-positive AGC patients who were treated with trastuzumab in combination with fluoropyrimidines plus cisplatin therapy as first-line treatment were retrospectively enrolled...
August 18, 2017: Cancer Chemotherapy and Pharmacology
https://www.readbyqxmd.com/read/28821741/predicting-the-murine-enterocyte-metabolic-response-to-diets-that-differ-in-lipid-and-carbohydrate-composition
#3
Neeraj Sinha, Maria Suarez-Diez, Evert M van Schothorst, Jaap Keijer, Vitor A P Martins Dos Santos, Guido J E J Hooiveld
The small intestine serves as gatekeeper at the interface between body and diet and is thought to play an important role in the etiology of obesity and associated metabolic disorders. A computational modelling approach was used to improve our understanding of the metabolic responses of epithelial cells to different diets. A constraint based, mouse-specific enterocyte metabolic model (named mmu_ENT717) was constructed to describe the impact of four fully characterized semi-purified diets, that differed in lipid and carbohydrate composition, on uptake, metabolism, as well as secretion of carbohydrates and lipids...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28820912/impact-of-novel-palmitoylated-prolactin-releasing-peptide-analogs-on-metabolic-changes-in-mice-with-diet-induced-obesity
#4
Veronika Pražienková, Martina Holubová, Helena Pelantová, Martina Bugáňová, Zdenko Pirník, Barbora Mikulášková, Andrea Popelová, Miroslava Blechová, Martin Haluzík, Blanka Železná, Marek Kuzma, Jaroslav Kuneš, Lenka Maletínská
Analogs of anorexigenic neuropeptides, such as prolactin-releasing peptide (PrRP), have a potential as new anti-obesity drugs. In our previous study, palmitic acid attached to the N-terminus of PrRP enabled its central anorexigenic effects after peripheral administration. In this study, two linkers, γ-glutamic acid at Lys11 and a short, modified polyethylene glycol at the N-terminal Ser and/or Lys11, were applied for the palmitoylation of PrRP31 to improve its bioavailability. These analogs had a high affinity and activation ability to the PrRP receptor GPR10 and the neuropeptide FF2 receptor, as well as short-term anorexigenic effect similar to PrRP palmitoylated at the N-terminus...
2017: PloS One
https://www.readbyqxmd.com/read/28820451/dynamic-fuzzy-logic-based-path-planning-for-mobility-assisted-localization-in-wireless-sensor-networks
#5
Abdullah Alomari, William Phillips, Nauman Aslam, Frank Comeau
Mobile anchor path planning techniques have provided as an alternative option for node localization in wireless sensor networks (WSNs). In such context, path planning is a movement pattern where a mobile anchor node's movement is designed in order to achieve a maximum localization ratio possible with a minimum error rate. Typically, the mobility path planning is designed in advance, which is applicable when the mobile anchor has sufficient sources of energy and time. However, when the mobility movement is restricted or limited, a dynamic path planning design is needed...
August 18, 2017: Sensors
https://www.readbyqxmd.com/read/28820260/thermally-induced-self-assembly-and-cyclization-of-l-leucyl-l-leucine-in-solid-state
#6
Marat A Ziganshin, Aisylu S Safiullina, Alexander Vladimirovich Gerasimov, Sufia A Ziganshina, Alexander E Klimovitskii, Khasan R Khayarov, Valery V Gorbatchuk
The thermal treatment of oligopeptides is one of the methods for synthesis of organic nanostructures. However, heating may lead not only to self-assembly of the initial molecules, but also to chemical reactions resulting in the formation of new unexpected nanostructures or changing in the properties of the existing ones. In the present work, the reaction of cyclization of dipeptide L-leucyl-L-leucine in solid state under heating was studied. The change in morphology of dipeptide thin film and formation of nanostructures after heating was visualized using atomic force microscopy...
August 18, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28819666/ph-responsive-prodrug-nanoparticles-based-on-a-sodium-alginate-derivative-for-selective-co-release-of-doxorubicin-and-curcumin-into-tumor-cells
#7
Cheng Gao, Fan Tang, Guiyi Gong, Jianxiang Zhang, Maggie P M Hoi, Simon M Y Lee, Ruibing Wang
In order to realize a combination of chemotherapy and selective drug release into tumor cells, novel pH-sensitive prodrugnanoparticles were designed and prepared via the self-assembly of a synthetic amphiphilic macromolecular prodrug for the selective co-delivery of doxorubicin (Dox) and curcumin (Cur). Dox was covalently conjugated to the oxidized sodium alginate through a Schiff base reaction to produce an amphiphilic macromolecular prodrug, and the prodrug was subsequently self-assembled into nanoparticles (Dox-NPs) in an aqueous solution, which were responsive to the acidic environment in tumor cells...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28819422/the-neutrophil-lymphocyte-ratio-predicts-recurrence-of-cervical-intraepithelial-neoplasia
#8
Sungwook Chun, Kyusik Shin, Ki Hyung Kim, Heung Yeol Kim, Wankyu Eo, Ji Young Lee, Jeong Namkung, Sang Hoon Kwon, Suk Bong Koh, Hong-Bae Kim
OBJECTIVE: The purpose of the present study was to determine the prognostic significance of the neutrophil-lymphocyte ratio (NLR) in recurrence of cervical intraepithelial neoplasia (CIN). METHODS: We evaluated the NLR as a prognostic marker in the entire cohort of 230 patients who had undergone surgical resection and were diagnosed with CIN. Subjects were categorized into two different groups based on the NLR (NLR-high and NLR-low) using cutoff values determined by receiver operating characteristic (ROC) analysis...
2017: Journal of Cancer
https://www.readbyqxmd.com/read/28819409/a-retrospective-discussion-of-the-prognostic-value-of-combining-prothrombin-time-pt-and-fibrinogen-fbg-in-patients-with-hepatocellular-carcinoma
#9
Xue-Ping Wang, Min-Jie Mao, Zhong-Lian He, Lin Zhang, Pei-Dong Chi, Jia-Rui Su, Shu-Qin Dai, Wan-Li Liu
Aims: The levels of coagulation system tests have been studied in various cancers. In this study, our aim is to evaluate the prognostic value of pretreatment plasma coagulation tests in hepatocellular carcinoma (HCC) patients. Patient and methods: A retrospective study was performed in 539 patients with HCC, and follow-up period was at least 60 months until recurrence or death. The prognostic significance of coagulation system tests (prothrombin time, activated partial thromboplastin time, thrombin time, fibrinogen) were determined by univariate and multivariate Cox hazard models...
2017: Journal of Cancer
https://www.readbyqxmd.com/read/28819403/impact-of-statin-use-on-outcomes-in-triple-negative-breast-cancer
#10
Simona F Shaitelman, Michael C Stauder, Pamela Allen, Sangeetha Reddy, Susan Lakoski, Bradley Atkinson, Jay Reddy, Diana Amaya, William Guerra, Naoto Ueno, Abigail Caudle, Welela Tereffe, Wendy A Woodward
Purpose: We sought to investigate if the use of HMG Co-A reductase inhibitors (statins) has an impact on outcomes among patients with triple negative breast cancer (TNBC). Methods: We reviewed the cases of women with invasive, non-metastatic TNBC, diagnosed 1997-2012. Clinical outcomes were compared based on statin use (defined as ever use during treatment vs. never use). We identified a subset of women for whom a 5-value lipid panel (5VLP) was available, including total cholesterol, low density lipoprotein, high density lipoprotein, very low density lipoprotein, and triglycerides...
2017: Journal of Cancer
https://www.readbyqxmd.com/read/28819024/trastuzumab-increases-her2-uptake-and-cross-presentation-by-dendritic-cells
#11
Victor A Gall, Anne V Philips, Na Qiao, Karen Clise-Dwyer, Alexander A Perakis, Mao Zhang, Guy Travis Clifton, Pariya Sukhumalchandra, Qing Ma, Sangeetha M Reddy, Dihua Yu, Jeffrey J Molldrem, George E Peoples, Gheath Alatrash, Elizabeth A Mittendorf
Early phase clinical trials evaluating CD8+ T cell-eliciting, HER2-derived peptide vaccines administered to HER2-positive breast cancer patients in the adjuvant setting suggest synergy between the vaccines and trastuzumab, the monoclonal antibody targeting the HER2 protein. Among 60 patients enrolled on clinical trials evaluating the E75+GM-CSF and GP2+GM-CSF vaccines, there have been no recurrences in patients vaccinated after receiving trastuzumab as part of standard therapy in the per treatment analyses conducted after a median follow-up of greater than 34 months...
August 17, 2017: Cancer Research
https://www.readbyqxmd.com/read/28818466/sink-or-swim-vertical-movement-and-nutrient-storage-in-phytoplankton
#12
James P Grover
A simulation model of vertically migrating phytoplankton is presented, using a Lagrangian, individual-based computational approach. Algal cells acquire and store nutrient at the bottom of the habitat, using stored nutrient to grow while in shallower waters. Stored nutrient also governs movement: cells sink when their nutrient quota falls below a threshold; otherwise they rise (or at least sink more slowly). Although the bottom of the habitat provides the growth-limiting nutrient, it also entails a risk of mortality...
August 14, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28817778/the-oxidation-state-of-4fe4s-clusters-modulates-the-dna-binding-affinity-of-dna-repair-proteins
#13
Edmund C M Tse, Theodore J Zwang, Jacqueline K Barton
A central question important to understanding DNA repair is how certain proteins are able to search for, detect, and fix DNA damage on a biologically relevant timescale. A feature of many base excision repair proteins is that they contain [4Fe4S] clusters that may aid their search for lesions. In this report, we establish the importance of the oxidation state of the redox-active [4Fe4S] cluster in the DNA damage detection process. We utilize DNA-modified electrodes to generate repair proteins with [4Fe4S] clusters in the 2+ and 3+ states by bulk electrolysis under an O2-free atmosphere...
August 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28817204/new-insight-into-the-control-of-peptic-ulcer-by-targeting-the-histamine-h2-receptor
#14
Vijai Singh, Nisarg Gohil, Robert Ramírez-García
Peptic ulcer disease is one of the major challenges in public health globally and new evidence shows that it can be controlled by targeting the histamine H2 receptor (H2 R). Recently, a number of H2 R antagonists have been synthesized and used to block the action of histamine on the parietal cells in the stomach and decrease the acid production. In this study, we modeled the H2 R by homology modeling using the 3-D crystal structure and this model was validated based on free energy and amino acid residues present in the allowed regions of a Ramachandran plot...
August 17, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28817124/directed-differentiation-and-long-term-maintenance-of-epicardial-cells-derived-from-human-pluripotent-stem-cells-under-fully-defined-conditions
#15
Xiaoping Bao, Xiaojun Lian, Tongcheng Qian, Vijesh J Bhute, Tianxiao Han, Sean P Palecek
Here, we describe how to efficiently direct human pluripotent stem cells (hPSCs) differentiation into self-renewing epicardial cells in a completely defined, xeno-free system by temporal modulation of regulators of canonical Wnt signaling. Appropriate differentiation-stage-specific application of Gsk3 inhibitor, Wnt inhibitor, and Gsk3 inhibitor (GiWiGi) is sufficient to produce cells expressing epicardial markers and exhibiting epicardial phenotypes with a high yield and purity from multiple hPSC lines in 16 d...
September 2017: Nature Protocols
https://www.readbyqxmd.com/read/28816670/colorization-using-neural-network-ensemble
#16
Zezhou Cheng, Qingxiong Yang, Bin Sheng
This paper investigates into the colorization problem which converts a grayscale image to a colorful version. This is a difficult problem and normally requires manual adjustment to achieve artifact-free quality. For instance, it normally requires human-labelled color scribbles on the grayscale target image or a careful selection of colorful reference images. The recent learning-based colorization techniques automatically colorize a grayscale image using a single neural network. Since different scenes usually have distinct color styles, it is difficult to accurately capture the color characteristics using a single neural network...
August 16, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28816417/docking-field-based-qsar-and-pharmacophore-studies-on-the-substituted-pyrimidine-derivatives-targeting-hiv-1-reverse-transcriptase
#17
Ningning Fan, Shuang Zhang, Tao Sheng, Liang Zhao, Zhenming Liu, Junyi Liu, Xiaowei Wang
HIV-1 reverse transcriptase (RT) is one of the most important enzymes required for viral replication, thus acting as an attractive target for anti-retroviral therapy. Pyrimidine analogues reportedly have selective inhibition on HIV-1 RT with favorable antiviral activities in our previous study. To further explore the relationship between inhibitory activity and pharmacophoric characteristics, field-based QSAR models were generated and validated using Schrodinger Suite (correlation coefficient of 0.8078, cross-validated value of 0...
August 17, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28816338/prediction-of-emergency-department-hospital-admission-based-on-natural-language-processing-and-neural-networks
#18
Xingyu Zhang, Joyce Kim, Rachel E Patzer, Stephen R Pitts, Aaron Patzer, Justin D Schrager
OBJECTIVE: To describe and compare logistic regression and neural network modeling strategies to predict hospital admission or transfer following initial presentation to Emergency Department (ED) triage with and without the addition of natural language processing elements. METHODS: Using data from the National Hospital Ambulatory Medical Care Survey (NHAMCS), a cross-sectional probability sample of United States EDs from 2012 and 2013 survey years, we developed several predictive models with the outcome being admission to the hospital or transfer vs...
August 16, 2017: Methods of Information in Medicine
https://www.readbyqxmd.com/read/28816038/estimating-grass-soil-bioconcentration-of-munitions-compounds-from-molecular-structure
#19
Tifany Lorena Torralba-Sanchez, Yuzhen Liang, Dominic M Di Toro
A partitioning-based model is presented to estimate the bioconcentration of five munitions compounds and two munition-like compounds in grasses. The model uses polyparameter linear free energy relationships (pp-LFERs) to estimate the partition coefficients between soil organic carbon and interstitial water and between interstitial water and the plant cuticle, a lipid-like plant component. Inputs for the pp-LFERs are a set of numerical descriptors computed from molecular structure only that characterize the molecular properties that determine the interaction with soil organic carbon, interstitial water, and plant cuticle...
August 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28815872/a-multimethod-computational-simulation-approach-for-investigating-mitochondrial-dynamics-and-dysfunction-in-degenerative-aging
#20
Timothy E Hoffman, Katherine J Barnett, Lyle Wallis, William H Hanneman
Research in biogerontology has largely focused on the complex relationship between mitochondrial dysfunction and biological aging. In particular, the mitochondrial free radical theory of aging (MFRTA) has been well accepted. However, this theory has been challenged by recent studies showing minimal increases in reactive oxygen species (ROS) as not entirely deleterious in nature, and even beneficial under the appropriate cellular circumstances. To assess these significant and nonintuitive observations in the context of a functional system, we have taken an in silico approach to expand the focus of the MFRTA by including other key mitochondrial stress response pathways, as they have been observed in the nematode Caenorhabditis elegans...
August 16, 2017: Aging Cell
keyword
keyword
103847
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"