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Surveillance bias

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https://www.readbyqxmd.com/read/28431950/postoperative-adjuvant-chemotherapy-is-associated-with-a-lower-incidence-of-colorectal-adenomas-in-patients-with-previous-colorectal-cancer
#1
Hee Seung Lee, Sung Bae Kim, Hyun Jung Lee, Soo Jung Park, Sung Pil Hong, Jae Hee Cheon, Won Ho Kim, Tae Il Kim
BACKGROUND AND AIMS: The effects of chemotherapeutic agents on the development of colorectal adenomas in patients with previous colorectal cancer (CRC) are not defined. Therefore, we evaluated the potential effect of adjuvant chemotherapy on the incidence of colorectal adenomas in patients with previous CRC. METHODS: We selected patients with low-risk stage II CRC with or without postoperative 5-fluorouracil-based adjuvant chemotherapy to reduce selection bias. Among 1808 patients with stage II CRC who underwent colonoscopic surveillance after curative resection of CRC between 2006 and 2013, 192 patients were retrospectively enrolled in this study after matching for age and sex...
April 18, 2017: Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/28425412/surveillance-for-hepatocellular-carcinoma-reduces-mortality-an-inverse-probability-of-treatment-weighted-analysis
#2
Roongruedee Chaiteerakij, Piyanat Chattieng, Jonggi Choi, Nutcha Pinchareon, Kessirin Thanapirom, Nopavut Geratikornsupuk
BACKGROUND: Evidence supporting benefit of hepatocellular carcinoma (HCC) surveillance in reducing mortality is not well-established. The effect of HCC surveillance in reducing mortality was assessed by an inverse probability of treatment weighting (IPTW)-based analysis controlled for inherent bias and confounders in observational studies. MATERIAL AND METHODS: This retrospective cohort study was conducted on 446 patients diagnosed with HCC between 2007 and 2013 at a major referral center...
May 2017: Annals of Hepatology
https://www.readbyqxmd.com/read/28419095/effectiveness-of-a-live-oral-human-rotavirus-vaccine-after-programmatic-introduction-in-bangladesh-a-cluster-randomized-trial
#3
K Zaman, David A Sack, Kathleen M Neuzil, Mohammad Yunus, Lawrence H Moulton, Jonathan D Sugimoto, Jessica A Fleming, Ilias Hossain, Shams El Arifeen, Tasnim Azim, Mustafizur Rahman, Kristen D C Lewis, Andrea J Feller, Firdausi Qadri, M Elizabeth Halloran, Alejandro Cravioto, John C Victor
BACKGROUND: Rotavirus vaccines are now globally recommended by the World Health Organization (WHO), but in early 2009 WHO's Strategic Advisory Group of Experts on Immunization reviewed available data and concluded that there was no evidence for the efficacy or effectiveness of a two-dose schedule of the human rotavirus vaccine (HRV; Rotarix) given early at 6 and 10 wk of age. Additionally, the effectiveness of programmatic rotavirus vaccination, including possible indirect effects, has not been assessed in low-resource populations in Asia...
April 2017: PLoS Medicine
https://www.readbyqxmd.com/read/28413975/the-safety-of-ovarian-preservation-in-stage-i-endometrioid-adenocarcinoma-based-on-propensity-score-matching
#4
Ting Hou, Zhen Wang, Yidi Sun, Chenglin Liu, Junyi Li, Yixue Li
Most patients with early stage endometrioid adenocarcinoma are treated with hysterectomy and bilateral oophorectomy to prevent ovarian metastasis. But this surgical menopause leads to some long-term sequelae for premenopausal women, especially for young women of childbearing age. This population-based study was to evaluate the safety of ovarian preservation in young women with stage I endometrioid adenocarcinoma.Patients of age 50 or younger than 50 with stage I endometrioid adenocarcinoma were explored from the Surveillance, Epidemiology, and End Results program database during 2004 to 2013...
April 17, 2017: Combinatorial Chemistry & High Throughput Screening
https://www.readbyqxmd.com/read/28404921/circulating-mir-31-as-an-effective-biomarker-for-detection-and-prognosis-of-human-cancer-a-meta-analysis
#5
Yingjun Ma, Yunfang Chen, Jinbo Lin, Yi Liu, Kai Luo, Yong Cao, Tieqiang Wang, Hongwei Jin, Zhan Su, Haolin Wu, Xiaoliang Chen, Jinquan Cheng
PURPOSE: Circulating miR-31 was found to be associated with cancers detection and prognosis. The present meta-analysis aimed to explore the effect of circulating miR-31 on cancer detection and prognosis. METHOD: The studies were accessed using multiple databases. RevMan5.3, Meta-DiSc 1.4, and STATA14.0 were used to estimate the pooled effects, heterogeneity among studies, and publication bias. RESULTS: A total of 14 studies with 1397 cancer patients and 1039 controls were included...
February 23, 2017: Oncotarget
https://www.readbyqxmd.com/read/28404010/risk-stratification-of-barrett-s-oesophagus-using-a-non-endoscopic-sampling-method-coupled-with-a-biomarker-panel-a-cohort-study
#6
Caryn S Ross-Innes, Hamza Chettouh, Achilleas Achilleos, Nuria Galeano-Dalmau, Irene Debiram-Beecham, Shona MacRae, Petros Fessas, Elaine Walker, Sibu Varghese, Theodore Evan, Pierre S Lao-Sirieix, Maria O'Donovan, Shalini Malhotra, Marco Novelli, Babett Disep, Phillip V Kaye, Laurence B Lovat, Rehan Haidry, Michael Griffin, Krish Ragunath, Pradeep Bhandari, Adam Haycock, Danielle Morris, Stephen Attwood, Anjan Dhar, Colin Rees, Matt D Rutter, Richard Ostler, Benoit Aigret, Peter D Sasieni, Rebecca C Fitzgerald
BACKGROUND: Barrett's oesophagus predisposes to adenocarcinoma. However, most patients with Barrett's oesophagus will not progress and endoscopic surveillance is invasive, expensive, and fraught by issues of sampling bias and the subjective assessment of dysplasia. We investigated whether a non-endoscopic device, the Cytosponge, could be coupled with clinical and molecular biomarkers to identify a group of patients with low risk of progression suitable for non-endoscopic follow-up. METHODS: In this multicentre cohort study (BEST2), patients with Barrett's oesophagus underwent the Cytosponge test before their surveillance endoscopy...
January 2017: Lancet. Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28401383/gallstone-disease-after-laparoscopic-sleeve-gastrectomy-in-an-asian-population-what-proportion-of-gallstones-actually-becomes-symptomatic
#7
Muhammed Yaser Hasan, Davide Lomanto, Lee Leng Loh, Jimmy Bok Yan So, Asim Shabbir
BACKGROUND: Despite evidence on gallstone disease after laparoscopic sleeve gastrectomy (LSG), there is an existing lack of consensus on practice guidelines, i.e., surveillance and stone-lowering prophylaxis. Available evidence also has a racial bias as western reports predominate current data. Considering the growing popularity of LSG in Asia and the unique Asian anthropometrics, we have attempted to provide a regional perspective by reviewing our LSG database to investigate the epidemiology of this complication...
April 11, 2017: Obesity Surgery
https://www.readbyqxmd.com/read/28397261/validity-and-reliability-of-administrative-coded-data-for-the-identification-of-hospital-acquired-infections-an-updated-systematic-review-with-meta-analysis-and-meta-regression-analysis
#8
Olga Redondo-González, José María Tenías, Ángel Arias, Alfredo J Lucendo
OBJECTIVE: To conduct an updated assessment of the validity and reliability of administrative coded data (ACD) in identifying hospital-acquired infections (HAIs). METHODS: We systematically searched three libraries for studies on ACD detecting HAIs compared to manual chart review. Meta-analyses were conducted for prosthetic and nonprosthetic surgical site infections (SSIs), Clostridium difficile infections (CDIs), ventilator-associated pneumonias/events (VAPs/VAEs) and non-VAPs/VAEs, catheter-associated urinary tract infections (CAUTIs), and central venous catheter-related bloodstream infections (CLABSIs)...
April 11, 2017: Health Services Research
https://www.readbyqxmd.com/read/28392994/medical-big-data-promise-and-challenges
#9
Choong Ho Lee, Hyung-Jin Yoon
The concept of big data, commonly characterized by volume, variety, velocity, and veracity, goes far beyond the data type and includes the aspects of data analysis, such as hypothesis-generating, rather than hypothesis-testing. Big data focuses on temporal stability of the association, rather than on causal relationship and underlying probability distribution assumptions are frequently not required. Medical big data as material to be analyzed has various features that are not only distinct from big data of other disciplines, but also distinct from traditional clinical epidemiology...
March 2017: Kidney Research and Clinical Practice
https://www.readbyqxmd.com/read/28389662/frequent-gu-wobble-pairings-reduce-translation-efficiency-in-plasmodium-falciparum
#10
Sherwin Chan, Jun-Hong Ch'ng, Mats Wahlgren, Jessada Thutkawkorapin
Plasmodium falciparum genome has 81% A+T content. This nucleotide bias leads to extreme codon usage bias and culminates in frequent insertion of asparagine homorepeats in the proteome. Using recodonized GFP sequences, we show that codons decoded via G:U wobble pairing are suboptimal codons that are negatively associated to protein translation efficiency. Despite this, one third of all codons in the genome are GU wobble codons, suggesting that codon usage in P. falciparum has not been driven to maximize translation efficiency, but may have evolved as translational regulatory mechanism...
April 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28385454/local-therapy-improves-survival-in-metastatic-prostate-cancer
#11
Sami-Ramzi Leyh-Bannurah, Stéphanie Gazdovich, Lars Budäus, Emanuele Zaffuto, Alberto Briganti, Firas Abdollah, Francesco Montorsi, Jonas Schiffmann, Mani Menon, Shahrokh F Shariat, Margit Fisch, Felix Chun, Thomas Steuber, Hartwig Huland, Markus Graefen, Pierre I Karakiewicz
BACKGROUND: Treatment of the primary, termed local therapy (LT), may improve survival in metastatic prostate cancer (mPCa) versus no local therapy (NLT). OBJECTIVE: To assess cancer-specific mortality (CSM) after LT versus NLT in mPCa. DESIGN, SETTING, AND PARTICIPANTS: Within the Surveillance, Epidemiology and End Results database (2004-2013), 13 692 mPCa patients were treated with LT (radical prostatectomy [RP] or radiation therapy [RT]) or NLT...
April 3, 2017: European Urology
https://www.readbyqxmd.com/read/28385133/influenza-testing-trends-in-sentinel-surveillance-general-practices-in-victoria-2007-to-2014
#12
Genevieve A Cowie, Benjamin C Cowie, James E Fielding
The Victorian Sentinel Practice Influenza Network conducts syndromic surveillance for influenza-like illness (ILI), with testing for laboratory confirmation of a proportion of cases at the discretion of general practitioners. The aim of this study was to evaluate the consistency of sentinel general practitioners' swabbing practice within and between influenza seasons. Aggregated, weekly, non-identified data for May to October each year from 2007 to 2014 were used to calculate the proportion of patients presenting with ILI (defined as cough, fever and fatigue), proportion of ILI patients swabbed and proportion of swabs positive for influenza...
March 31, 2017: Communicable Diseases Intelligence Quarterly Report
https://www.readbyqxmd.com/read/28376084/demographic-transition-and-the-dynamics-of-measles-in-six-provinces-in-china-a-modeling-study
#13
Sheng Li, Chao Ma, Lixin Hao, Qiru Su, Zhijie An, Fubao Ma, Shuyun Xie, Aiqiang Xu, Yanyang Zhang, Zhengrong Ding, Hui Li, Lisa Cairns, Huaqing Wang, Huiming Luo, Ning Wang, Li Li, Matthew J Ferrari
BACKGROUND: Industrialization and demographic transition generate nonstationary dynamics in human populations that can affect the transmission and persistence of infectious diseases. Decades of increasing vaccination and development have led to dramatic declines in the global burden of measles, but the virus remains persistent in much of the world. Here we show that a combination of demographic transition, as a result of declining birth rates, and reduced measles prevalence, due to improved vaccination, has shifted the age distribution of susceptibility to measles throughout China...
April 2017: PLoS Medicine
https://www.readbyqxmd.com/read/28374815/the-impact-of-a-prior-diagnosis-of-barrett-s-esophagus-on-esophageal-adenocarcinoma-survival
#14
Angela C Tramontano, Deirdre F Sheehan, Jennifer M Yeh, Chung Yin Kong, Emily C Dowling, Joel H Rubenstein, Julian A Abrams, John M Inadomi, Deborah Schrag, Chin Hur
OBJECTIVES: Endoscopic surveillance of patients with Barrett's Esophagus (BE) is recommended to detect esophageal adenocarcinoma (EAC) and its dysplasia precursors, but survival benefits are unclear. Using Surveillance, Epidemiology, and End Results (SEER) and linked Medicare data, we sought to determine the impact of a prior BE diagnosis on survival in patients with EAC. METHODS: Our analysis focused on patients over age 65 with primary EAC diagnosed in a SEER region from 2000-2011 and enrolled in Medicare...
April 4, 2017: American Journal of Gastroenterology
https://www.readbyqxmd.com/read/28369184/importance-of-survey-design-for-studying-the-epidemiology-of-emerging-tobacco-product-use-among-youth
#15
Cristine D Delnevo, Daniel A Gundersen, Michelle T B Manderski, Daniel P Giovenco, Gary A Giovino
Accurate surveillance is critical for monitoring the epidemiology of emerging tobacco products in the United States, and survey science suggests that survey response format can impact prevalence estimates. We utilized data from the 2014 New Jersey Youth Tobacco Survey (n = 3,909) to compare estimates of the prevalence of 4 behaviors (ever hookah use, current hookah use, ever e-cigarette use, and current e-cigarette use) among New Jersey high school students, as assessed using "check-all-that-apply" questions, with estimates measured by means of "forced-choice" questions...
March 22, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28359254/development-of-a-genus-specific-next-generation-sequencing-approach-for-sensitive-and-quantitative-determination-of-the-legionella-microbiome-in-freshwater-systems
#16
Rui P A Pereira, Jörg Peplies, Ingrid Brettar, Manfred G Höfle
BACKGROUND: Next Generation Sequencing (NGS) has revolutionized the analysis of natural and man-made microbial communities by using universal primers for bacteria in a PCR based approach targeting the 16S rRNA gene. In our study we narrowed primer specificity to a single, monophyletic genus because for many questions in microbiology only a specific part of the whole microbiome is of interest. We have chosen the genus Legionella, comprising more than 20 pathogenic species, due to its high relevance for water-based respiratory infections...
March 31, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28338912/invited-commentary-the-tao-of-clinical-cohort-analysis-when-the-transitions-that-can-be-spoken-of-are-not-the-true-transitions
#17
Stephen J Mooney
Patterns in risk-related behaviors identified using clinically deployed surveys may hold value for public health surveillance. However, because such surveys assess subjects only when subjects choose to visit clinics, clinical data are subject to variability in observation patterns that is not present in conventional longitudinal data sets in which research teams contact subjects at regular intervals. In this issue of the Journal, Wilkinson et al. (Am J Epidemiol. 2017;185(8):627-635) describe how they applied a latent transition analysis technique to surveillance data collected during clinic visits...
April 15, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28338879/evidence-for-detection-bias-by-medication-use-in-a-cohort-study-of-breast-cancer-survivors
#18
Heidi S Wirtz, Gregory S Calip, Diana S M Buist, Julie R Gralow, William E Barlow, Shelly Gray, Denise M Boudreau
In previous studies, we found modestly decreased and increased risks of second breast cancer events with the use of statins and antibiotics, respectively, after adjustment for surveillance mammography. We evaluated detection bias by comparing receipt of surveillance mammography among users of these 2 disparate classes of medication. Adult women diagnosed with early-stage breast cancer during 1990-2008 (n = 3,965) while enrolled in an integrated health-care plan (Group Health Cooperative; Washington State) were followed for up to 10 years in the Commonly Used Medications and Breast Cancer Outcomes (COMBO) Study...
April 15, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28334753/alcohol-screening-among-young-people-a-prospective-study-from-the-swiss-sentinel-surveillance-system-sentinella-of-physicians-a-priori-opinions
#19
Coralie Wenger-Bonny, Adjua Alexandra N'goran, Jérôme Pasquier, Charles Dvorak, Dagmar M Haller, Lilli Herzig
Background.: Systematic screening for excessive alcohol use among young people is recommended but rarely implemented. Family practitioners tend to select patients for screening, based on their preliminary subjective opinions, which may be biased. Objective.: To evaluate the ability of family practitioners to identify excessive alcohol use among young people prior to screening them. Methods.: This prospective study was conducted through Sentinella, an epidemiological network involving 150 family practitioners across Switzerland...
February 22, 2017: Family Practice
https://www.readbyqxmd.com/read/28331624/comparison-of-hydroxyethyl-starch-regulatory-summaries-from-the-food-and-drug-administration-and-the-european-medicines-agency
#20
Christian J Wiedermann, Klaus Eisendle
This article aims to highlight the positions of the Food and Drug Administration and the European Medicines Agency regarding use and marketing of hydroxyethyl starch (HES) products, and how these have changed over recent years. In 2013, warnings from both agencies advised against use of HES in critically ill patients, including patients with sepsis, when several large randomized controlled trials on volume resuscitation in critical illness failed to observe clinically beneficial effects of HES. In areas such as patient monitoring and requirements for further clinical trials, the FDA and EMA are very much in agreement in their recommendations...
2017: Journal of Pharmaceutical Policy and Practice
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