7 results on '"Nanxun Ma"'
Search Results
2. Bacterial Communities Associated With Abnormal Nugent Score in Postmenopausal Versus Premenopausal Women
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David N. Fredricks, Nanxun Ma, Noah G. Hoffman, Kathy Agnew, Susan D. Reed, Sean Proll, Sujatha Srinivasan, Caroline M. Mitchell, D.J. Valint, Tina L. Fiedler, Katherine A. Guthrie, and Michael C. Wu
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0301 basic medicine ,medicine.medical_specialty ,Atopobium ,Major Articles and Brief Reports ,03 medical and health sciences ,0302 clinical medicine ,RNA, Ribosomal, 16S ,Megasphaera ,Prevotella ,Humans ,Immunology and Allergy ,Medicine ,030212 general & internal medicine ,Vaginitis ,Bacteria ,biology ,business.industry ,Obstetrics ,Microbiota ,Vaginosis, Bacterial ,biology.organism_classification ,medicine.disease ,female genital diseases and pregnancy complications ,Postmenopause ,Menopause ,030104 developmental biology ,Infectious Diseases ,medicine.anatomical_structure ,Premenopause ,Vagina ,Female ,Nugent score ,Bacterial vaginosis ,business - Abstract
The Nugent score is the reference standard for bacterial vaginosis (BV) diagnosis but has not been validated in postmenopausal women. We compared relative abundances from 16S ribosomal RNA gene sequencing of vaginal microbiota with Nugent score in cohorts of premenopausal (n = 220) and postmenopausal (n = 144) women. In premenopausal women, 33 taxa were significantly correlated with Nugent score, including the classic BV-associated taxa Gardnerella, Atopobium, Sneathia, Megasphaera, and Prevotella. In postmenopausal women, 11 taxa were significantly associated with Nugent score, including Prevotella but no other BV-associated genera. High Nugent scores should not be used to infer BV in postmenopausal women.
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- 2020
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3. Egg consumption, overall diet quality, and risk of type 2 diabetes and coronary heart disease: A pooling project of US prospective cohorts
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Edmond K. Kabagambe, JoAnn E. Manson, Guohai Zhou, David R. Gagnon, I-Min Lee, J. Michael Gaziano, Suzanne E. Judd, Julie E. Buring, Lyn M. Steffen, Luc Djoussé, Cheryl R. Clark, Xia Zhou, Mary L. Biggs, Annette L. Fitzpatrick, Robyn L. McClelland, Sameera A. Talegawkar, and Nanxun Ma
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0301 basic medicine ,Adult ,Eggs ,030209 endocrinology & metabolism ,Coronary Disease ,Type 2 diabetes ,Critical Care and Intensive Care Medicine ,Article ,Cohort Studies ,03 medical and health sciences ,0302 clinical medicine ,Risk Factors ,medicine ,Humans ,Prospective Studies ,Prospective cohort study ,Aged ,030109 nutrition & dietetics ,Nutrition and Dietetics ,business.industry ,Proportional hazards model ,Confounding ,Hazard ratio ,Middle Aged ,medicine.disease ,United States ,Diet ,Diabetes Mellitus, Type 2 ,Relative risk ,embryonic structures ,Cohort ,business ,Body mass index ,Demography - Abstract
BACKGROUND AND AIMS: Data on the relation of egg consumption with risk of type 2 diabetes (T2D) and coronary heart disease (CHD) are limited and inconsistent. Few studies have controlled for overall dietary patterns in egg-T2D or egg-CHD analyses, and it is unclear whether any observed elevated risks of T2D and CHD with frequent egg consumption is real or due to confounding by dietary habits. We tested the hypothesis that frequent egg consumption is associated with a higher risk of T2D and CHD risk after adjustment for overall dietary patterns among adults. DESIGN: We used prospective cohort design to complete time-to-event analyses. METHODS: We pooled de novo, harmonized, individual-level analyses from nine US cohorts (n=103,811). Cox regression was used to estimate hazard ratios separately in each cohort adjusting for age, ethnicity, body mass index (BMI), exercise, smoking, alcohol intake, and dietary patterns. We pooled cohort-specific results using an inverse-variance weighted method to estimate summary relative risks. RESULTS: Median age ranged from 25 to 72 years. Median egg consumption was 1 egg per week in most of the cohorts. While egg consumption up to one per week was not associated with T2D risk, consumption of ≥2 eggs per week was associated with elevated risk [27% elevated risk of T2D comparing 7+ eggs/week with none (95% CI: 16% to 37%)]. There was little evidence for heterogeneity across cohorts and we observed similar conclusions when stratified by BMI. Overall, egg consumption was not associated with the risk of CHD. However, in a sensitivity analysis, there was a 30% higher risk of CHD (95% CI: 3%-56%) restricted to older adults consuming 5-6 eggs/week. CONCLUSIONS: Our data showed an elevated risk of T2D with egg consumption of ≥2 eggs per week but not with
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- 2020
4. Multi-objective Ranking via Constrained Optimization
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Nanxun Ma, Yi Sun, Michinari Momma, and Alireza Bagheri Garakani
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FOS: Computer and information sciences ,Computer Science - Machine Learning ,Mathematical optimization ,Boosting (machine learning) ,Computer science ,Augmented Lagrangian method ,Constrained optimization ,Computer Science::Digital Libraries ,Computer Science - Information Retrieval ,Ranking (information retrieval) ,Machine Learning (cs.LG) ,Set (abstract data type) ,Search ranking ,Production (economics) ,Learning to rank ,Information Retrieval (cs.IR) - Abstract
In this paper, we introduce an Augmented Lagrangian based method to incorporate the multiple objectives (MO) in a search ranking algorithm. Optimizing MOs is an essential and realistic requirement for building ranking models in production. The proposed method formulates MO in constrained optimization and solves the problem in the popular Boosting framework -- a novel contribution of our work. Furthermore, we propose a procedure to set up all optimization parameters in the problem. The experimental results show that the method successfully achieves MO criteria much more efficiently than existing methods.
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- 2020
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5. Ultrasound carotid plaque features, cardiovascular disease risk factors and events: The Multi-Ethnic Study of Atherosclerosis
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James H. Stein, Adam D. Gepner, Russell P. Tracy, Robyn L. McClelland, Claudia E. Korcarz, Wendy S. Post, Nanxun Ma, Amanda J. Gassett, Carol Mitchell, and Joel D. Kaufman
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Carotid Artery Diseases ,Male ,Carotid ultrasound ,medicine.medical_specialty ,Coronary Disease ,Disease ,030204 cardiovascular system & hematology ,Carotid Intima-Media Thickness ,Risk Assessment ,03 medical and health sciences ,0302 clinical medicine ,Predictive Value of Tests ,Risk Factors ,Internal medicine ,Prevalence ,medicine ,Humans ,cardiovascular diseases ,Aged ,Aged, 80 and over ,Multivariable linear regression ,business.industry ,Proportional hazards model ,Ultrasound ,Echogenicity ,Middle Aged ,Prognosis ,Plaque, Atherosclerotic ,United States ,Coronary heart disease ,Cerebrovascular Disorders ,Carotid Arteries ,Cardiology ,Disease risk ,Female ,Cardiology and Cardiovascular Medicine ,business ,030217 neurology & neurosurgery - Abstract
Background and aims It is not known if ultrasound carotid plaque features are associated with cardiovascular disease (CVD) risk factors or if they predict future CVD events. Methods We measured total carotid plaque area (TPA) and grayscale plaque features (grayscale median, black areas, and discrete white areas) by B-mode carotid ultrasound among 2205 participants who participated in the first (baseline) visit of the Multi-Ethnic Study of Atherosclerosis. Multivariable linear regression was used to examine relationships between ultrasound plaque features and CVD risk factors at baseline. Cox proportional hazards models were used to assess if TPA, grayscale features, and carotid plaque score (number of arterial segments with a plaque) could predict incident coronary heart disease and cerebrovascular disease events over a mean follow-up of 13.3 years. Results Participants were mean (standard deviation [SD]) 65.4 (9.6) years, 49% male, 39% White, 11% Chinese, 28% Black, and 22% Hispanic. Mean TPA 27.7 (24.7) mm2, but no grayscale plaque features, was associated with CVD risk factors. In fully adjusted models, TPA but no grayscale features predicted incident coronary heart disease (CHD) events (HR 1.23; 95%CI 1.11–1.36; p Conclusions In middle-aged adults free of known cardiovascular disease, TPA but not grayscale plaque features was associated with CVD risk factors and predicted incident CHD events. For CHD, prediction indices for TPA were similar to carotid plaque score but less than for CAC.
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- 2018
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6. Association between postmenopausal vulvovaginal discomfort, vaginal microbiota, and mucosal inflammation
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Caroline M. Mitchell, Susan D. Reed, Joseph C. Larson, D.J. Valint, Nanxun Ma, Robert Pepin, Katherine A. Guthrie, Michael C. Wu, Andrea Z. LaCroix, Sean Proll, David N. Fredricks, Alissa J. Mitchell, Daniel Raftery, and Sujatha Srinivasan
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medicine.medical_specialty ,Urinary system ,Placebo ,Severity of Illness Index ,Gastroenterology ,Article ,law.invention ,03 medical and health sciences ,0302 clinical medicine ,Randomized controlled trial ,Quality of life ,law ,RNA, Ribosomal, 16S ,Lactobacillus ,Internal medicine ,medicine ,Humans ,Metabolomics ,030212 general & internal medicine ,Aged ,Inflammation ,030219 obstetrics & reproductive medicine ,Estradiol ,biology ,Genitourinary system ,business.industry ,Microbiota ,Obstetrics and Gynecology ,Estrogens ,Hydrogen-Ion Concentration ,Middle Aged ,biology.organism_classification ,medicine.disease ,Female Urogenital Diseases ,Postmenopause ,Menopause ,Administration, Intravaginal ,Treatment Outcome ,Vagina ,Metabolome ,Vaginal Creams, Foams, and Jellies ,Cytokines ,Female ,Sexual function ,business - Abstract
Half of all postmenopausal women report symptoms of vulvar, vaginal, or urinary discomfort with substantial impact on sexual function and quality of life; underlying mechanisms leading to symptoms are poorly understood.To examine the possibility that the vaginal microbiota and/or mucosal immune response contributes to the severity of bothersome vaginal symptoms, we conducted a substudy of samples from a randomized trial of vaginal treatment for genitourinary syndrome of menopause to compare these features between women whose symptoms improved and women whose symptoms did not improve.This is a secondary analysis of samples collected in a 12-week randomized trial of treatment with vaginal estradiol or moisturizer vs placebo for moderate-severe postmenopausal symptoms of vaginal discomfort. We randomly selected 20 women in each arm with ≥2-point decrease in most bothersome symptom severity (responders) and 20 matched controls with ≤1-point decrease (nonresponders). At 0, 4, and 12 weeks, we characterized vaginal microbiota (16S ribosomal RNA gene sequencing), vaginal fluid metabolites (broad-based metabolomic profiling), vaginal fluid-soluble immune markers (Meso Scale Discovery), pH, and vaginal maturation index. We compared responders with nonresponders at baseline and across all visits using linear mixed models to evaluate associations with microbiota, metabolites, and immune markers, incorporating visit and participant-specific random effects while controlling for treatment arm.Here, the mean age of women was 61 years (n=120), and most women (92%) were White. At enrollment, no significant differences were observed between responders and nonresponders in age, most bothersome symptom type or severity, microbiota composition or diversity, Lactobacillus dominance, metabolome, or immune markers. There was a significant decrease in diversity of the vaginal microbiota in both responders and nonresponders (P.001) over 12 weeks. Although this change did not differ by responder status, diversity was associated with treatment arm: more women in the estradiol arm (63%) had Lactobacillus-dominant, lower diversity bacterial communities than women in the moisturizer (35%) or dual placebo (23%) arms (P=.001) at 12 weeks. The metabolome, vaginal maturation index, and measured immune markers were not associated with responder status over the 12 weeks but varied by treatment arm.Postmenopausal vaginal symptom severity was not significantly associated with vaginal microbiota or mucosal inflammatory markers in this small study. Women receiving vaginal estradiol experienced greater abundance of lactobacilli and lower vaginal pH at end of treatment.
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- 2021
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7. Abstract 470: Ultrasound Carotid Plaque Features, Cardiovascular Disease Risk Factors and Events: the Multi-Ethnic Study of Atherosclerosis
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James H. Stein, Carol Mitchell, Joel D. Kaufman, Wendy S. Post, Amanda J. Gassett, Claudia E. Korcarz, Robyn L. McClelland, Nanxun Ma, Adam D. Gepner, and Russell P. Tracy
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medicine.medical_specialty ,business.industry ,Ultrasound ,Ethnic group ,Disease ,Internal medicine ,Primary prevention ,Epidemiology ,Cohort ,medicine ,Disease risk ,cardiovascular diseases ,Cardiology and Cardiovascular Medicine ,business - Abstract
Background: Grayscale ultrasound atherosclerotic plaque characteristics may predict cardiovascular disease (CVD) events, though they have not been investigated in a large primary prevention cohort. This study determined if CVD risk factors were associated with carotid plaque ultrasound characteristics and if these characteristics could predict future coronary heart disease (CHD) and stroke/transient ischemic attack (TIA) events in a multi-ethnic cohort free of known CVD at baseline. Methods: We measured carotid artery total plaque area (TPA) and grayscale carotid plaque features (grayscale median, black areas, and discrete white areas) at baseline in participants of the Multi-Ethnic Study of Atherosclerosis that had B-mode carotid ultrasound examinations. There were 2205 participants with images available for TPA analyses and 1703 with images available for grayscale analyses. Multivariable linear regression analysis was used to examine relationships between baseline ultrasound carotid plaque features and CVD risk factors. Cox proportional hazards models were used to assess their ability to predict incident CHD and stroke/TIA events over an average follow-up of 13.3 years. The predictive characteristics of TPA and carotid plaque features were compared to carotid plaque score and coronary artery calcification (CAC) score. Results: Participants were mean (standard deviation) 65.4 (9.6) years old, 49% male, 39% White, 28% Black, 22% Hispanic, and 11% Chinese. Mean TPA (27.7 [24.7] mm 2 ), but not grayscale plaque features, were associated with several CVD risk factors. In risk factor-adjusted models, TPA was the only plaque feature that predicted incident CHD events (HR 1.23; 95% CI 1.11-1.36; p Conclusions: In middle-aged individuals free of known CVD, carotid TPA was associated with CVD risk factors and predicted incident CHD events while grayscale plaque features did not. For CHD, predictive characteristics of TPA were similar to carotid plaque score but lower than CAC score.
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- 2018
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