1
|
Fan X, Ma R, Yue C, Liu J, Yue B, Yang W, Li Y, Gu J, Ayala JE, Bunker DE, Yan X, Qi D, Su X, Li L, Zhang D, Zhang H, Yang Z, Hou R, Liu S. A snapshot of climate drivers and temporal variation of Ixodes ovatus abundance from a giant panda living in the wild. Int J Parasitol Parasites Wildl 2023; 20:162-169. [PMID: 36890989 PMCID: PMC9986245 DOI: 10.1016/j.ijppaw.2023.02.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 02/21/2023] [Accepted: 02/21/2023] [Indexed: 03/03/2023]
Abstract
Ticks and tick-borne diseases have negative impacts on the health of wild animals including endangered and vulnerable species. The giant panda (Ailuropoda melanoleuca), a vulnerable and iconic flagship species, is threatened by tick infestation as well. Not only can ticks cause anemia and immunosuppression in the giant panda, but also bacterial and viral diseases. However, previous studies regarding tick infestation on giant pandas were limited in scope as case reports from sick or dead animals. In this study, an investigation focusing on the tick infestation of a reintroduced giant panda at the Daxiangling Reintroduction Base in Sichuan, China was conducted. Ticks were routinely collected and identified from the ears of the giant panda from March to September in 2021. A linear model was used to test the correlation between tick abundance and climate factors. All ticks were identified as Ixodes ovatus. Tick abundance was significantly different among months. Results from the linear model showed temperature positively correlated to tick abundance, while air pressure had a negative correlation with tick abundance. To the best of our knowledge, this study is the first reported investigation of tick species and abundance on a healthy giant panda living in the natural environment, and provides important information for the conservation of giant pandas and other species sharing the same habitat.
Collapse
Affiliation(s)
- Xueyang Fan
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Rui Ma
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Changjuan Yue
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Jiabin Liu
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Bisong Yue
- Sichuan Key Laboratory of Conservation Biology on Endangered Wildlife, College of Life Sciences, Sichuan University, Chengdu, 610064, Sichuan, China
| | - Wanjing Yang
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Yunli Li
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Jiang Gu
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - James E Ayala
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Daniel E Bunker
- Department of Biological Sciences, New Jersey Institute of Technology, Newark, NJ, 07102, USA
| | - Xia Yan
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Dunwu Qi
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Xiaoyan Su
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Lin Li
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Dongsheng Zhang
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Hongwen Zhang
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Zhisong Yang
- Sichuan Academy of Giant Panda, Chengdu, 610081, China
| | - Rong Hou
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Songrui Liu
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| |
Collapse
|
2
|
Sandie AB, Tejiokem MC, Faye CM, Hamadou A, Abah AA, Mbah SS, Tagnouokam-Ngoupo PA, Njouom R, Eyangoh S, Abanda NK, Diarra M, Ben Miled S, Tchuente M, Tchatchueng-Mbougua JB, Tchatchueng-Mbougua JB. Observed versus estimated actual trend of COVID-19 case numbers in Cameroon: A data-driven modelling. Infect Dis Model 2023; 8:228-239. [PMID: 36776734 PMCID: PMC9905042 DOI: 10.1016/j.idm.2023.02.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 02/02/2023] [Accepted: 02/02/2023] [Indexed: 02/10/2023] Open
Abstract
Controlling the COVID-19 outbreak remains a challenge for Cameroon, as it is for many other countries worldwide. The number of confirmed cases reported by health authorities in Cameroon is based on observational data, which is not nationally representative. The actual extent of the outbreak from the time when the first case was reported in the country to now remains unclear. This study aimed to estimate and model the actual trend in the number of COVID -19 new infections in Cameroon from March 05, 2020 to May 31, 2021 based on an observed disaggregated dataset. We used a large disaggregated dataset, and multilevel regression and poststratification model was applied prospectively for COVID-19 cases trend estimation in Cameroon from March 05, 2020 to May 31, 2021. Subsequently, seasonal autoregressive integrated moving average (SARIMA) modeling was used for forecasting purposes. Based on the prospective MRP modeling findings, a total of about 7450935 (30%) of COVID-19 cases was estimated from March 05, 2020 to May 31, 2021 in Cameroon. Generally, the reported number of COVID-19 infection cases in Cameroon during this period underestimated the estimated actual number by about 94 times. The forecasting indicated a succession of two waves of the outbreak in the next two years following May 31, 2021. If no action is taken, there could be many waves of the outbreak in the future. To avoid such situations which could be a threat to global health, public health authorities should effectively monitor compliance with preventive measures in the population and implement strategies to increase vaccination coverage in the population.
Collapse
Key Words
- ACF, Autocorrelation Function
- AIC, Akaike information criterion
- COVID-19
- COVID-19, Coronavirus Disease 2019
- Cameroon
- Forecasting
- MAE, Mean Absolute Error
- MAPE, Mean Absolute Percentage Error
- MASE, Mean Absolute Scaled Error
- ME, Mean Error
- MPE, Mean Percentage Error
- MRP, Multilevel Regression and Post-stratification
- Observed
- PACF, Partial Autocorrelation Function
- PLACARD, Platform for Collecting, Analyzing and Reporting Data
- Post-stratification
- SARIMA, Seasonal Autoregressive integrated moving average
- SARS-CoV-2, Severe Acute Respiratory Syndrome Coronavirus 2
- Underestimated
Collapse
Affiliation(s)
- Arsène Brunelle Sandie
- African Population and Health Research Center, West Africa Regional Office, Dakar, Senegal,Centre Pasteur du Cameroon, membre du Réseau International des Instituts Pasteur, Cameroon,Corresponding author. African Population and Health Research Center, West Africa Regional Office, Dakar, Senegal.
| | | | - Cheikh Mbacké Faye
- African Population and Health Research Center, West Africa Regional Office, Dakar, Senegal
| | - Achta Hamadou
- Centre Pasteur du Cameroon, membre du Réseau International des Instituts Pasteur, Cameroon
| | - Aristide Abah Abah
- Direction de la lutte contre les Maladies épidémiques et les pandémies, Ministère de la santé publique, Cameroon
| | - Serge Sadeuh Mbah
- Centre Pasteur du Cameroon, membre du Réseau International des Instituts Pasteur, Cameroon
| | | | - Richard Njouom
- Centre Pasteur du Cameroon, membre du Réseau International des Instituts Pasteur, Cameroon
| | - Sara Eyangoh
- Centre Pasteur du Cameroon, membre du Réseau International des Instituts Pasteur, Cameroon
| | - Ngu Karl Abanda
- Centre Pasteur du Cameroon, membre du Réseau International des Instituts Pasteur, Cameroon
| | | | | | - Maurice Tchuente
- Fondation pour la recherche l'ingénierie et l'innovation, Cameroon,IRD UMI 209 UMMISCO, University of Yaounde I, P.O. Box 337, Yaounde, Cameroon
| | - Jules Brice Tchatchueng-Mbougua
- Centre Pasteur du Cameroon, membre du Réseau International des Instituts Pasteur, Cameroon,IRD UMI 209 UMMISCO, University of Yaounde I, P.O. Box 337, Yaounde, Cameroon
| | - Jules Brice Tchatchueng-Mbougua
- Centre Pasteur du Cameroon, membre du Réseau International des Instituts Pasteur, Cameroon,IRD UMI 209 UMMISCO, University of Yaounde I, P.O. Box 337, Yaounde, Cameroon
| |
Collapse
|
3
|
Cui Y, Zhang J, Li Z, Wei K, Lei Y, Ren J, Wu L, Shi Z, Meng X, Yang X, Gao X. A CT-based deep learning radiomics nomogram for predicting the response to neoadjuvant chemotherapy in patients with locally advanced gastric cancer: A multicenter cohort study. EClinicalMedicine 2022; 46:101348. [PMID: 35340629 PMCID: PMC8943416 DOI: 10.1016/j.eclinm.2022.101348] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 02/21/2022] [Accepted: 02/23/2022] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Accurate prediction of treatment response to neoadjuvant chemotherapy (NACT) in individual patients with locally advanced gastric cancer (LAGC) is essential for personalized medicine. We aimed to develop and validate a deep learning radiomics nomogram (DLRN) based on pretreatment contrast-enhanced computed tomography (CT) images and clinical features to predict the response to NACT in patients with LAGC. METHODS 719 patients with LAGC were retrospectively recruited from four Chinese hospitals between Dec 1st, 2014 and Nov 30th, 2020. The training cohort and internal validation cohort (IVC), comprising 243 and 103 patients, respectively, were randomly selected from center I; the external validation cohort1 (EVC1) comprised 207 patients from center II; and EVC2 comprised 166 patients from another two hospitals. Two imaging signatures, reflecting the phenotypes of the deep learning and handcrafted radiomics features, were constructed from the pretreatment portal venous-phase CT images. A four-step procedure, including reproducibility evaluation, the univariable analysis, the LASSO method, and the multivariable logistic regression analysis, was applied for feature selection and signature building. The integrated DLRN was then developed for the added value of the imaging signatures to independent clinicopathological factors for predicting the response to NACT. The prediction performance was assessed with respect to discrimination, calibration, and clinical usefulness. Kaplan-Meier survival curves based on the DLRN were used to estimate the disease-free survival (DFS) in the follow-up cohort (n = 300). FINDINGS The DLRN showed satisfactory discrimination of good response to NACT and yielded the areas under the receiver operating curve (AUCs) of 0.829 (95% CI, 0.739-0.920), 0.804 (95% CI, 0.732-0.877), and 0.827 (95% CI, 0.755-0.900) in the internal and two external validation cohorts, respectively, with good calibration in all cohorts (p > 0.05). Furthermore, the DLRN performed significantly better than the clinical model (p < 0.001). Decision curve analysis confirmed that the DLRN was clinically useful. Besides, DLRN was significantly associated with the DFS of patients with LAGC (p < 0.05). INTERPRETATION A deep learning-based radiomics nomogram exhibited a promising performance for predicting therapeutic response and clinical outcomes in patients with LAGC, which could provide valuable information for individualized treatment.
Collapse
Key Words
- AIC, Akaike information criterion
- CT, computed tomography
- DCA, decision curve analysis
- DFS, disease free survival
- DLRN, deep learning radiomics nomogram
- Deep learning
- GR, good response
- ICC, interclass correlation coefficient
- IDI, integrated discrimination improvement
- LAGC, locally advanced gastric cancer
- LASSO, least absolute shrinkage and selection operator
- Locally advanced gastric cancer
- NACT, neoadjuvant chemotherapy
- NRI, Net reclassification index
- Neoadjuvant chemotherapy
- PR, poor response
- ROC, Receiver operating characteristic
- ROI, regions of interest
- Radiomics nomogram
- TRG, tumor regression grade
Collapse
Affiliation(s)
- Yanfen Cui
- Department of Radiology, Shanxi Cancer Hospital, Shanxi Medical University, Taiyuan 030013, China
- Department of Radiology, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, 106 Zhangshan Er Road, Guangzhou 510080, China
- Guangdong Provincial Key Laboratory of Artificial Intelligence in Medical Image Analysis and Application, Guangzhou 510080, China
| | - Jiayi Zhang
- Medical Imaging Department, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, Jiangsu 215163, China
| | - Zhenhui Li
- Department of Radiology, Yunnan Cancer Center, The Third Affiliated Hospital of Kunming Medical University, Yunnan Cancer Hospital, Kunming 650118, China
| | - Kaikai Wei
- Department of Radiology, The Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510655, China
| | - Ye Lei
- Department of Urology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | | | - Lei Wu
- Department of Radiology, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, 106 Zhangshan Er Road, Guangzhou 510080, China
| | - Zhenwei Shi
- Department of Radiology, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, 106 Zhangshan Er Road, Guangzhou 510080, China
| | - Xiaochun Meng
- Department of Radiology, The Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510655, China
- Corresponding authors.
| | - Xiaotang Yang
- Department of Radiology, Shanxi Cancer Hospital, Shanxi Medical University, Taiyuan 030013, China
- Corresponding authors.
| | - Xin Gao
- Department of Radiology, Shanxi Cancer Hospital, Shanxi Medical University, Taiyuan 030013, China
- Medical Imaging Department, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, Jiangsu 215163, China
- Corresponding author at: Medical Imaging Department, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, Jiangsu 215163, China.
| |
Collapse
|
4
|
Zeng Z, Gao Y, Li J, Zhang G, Sun S, Wu Q, Gong Y, Xie C. Violations of proportional hazard assumption in Cox regression model of transcriptomic data in TCGA pan-cancer cohorts. Comput Struct Biotechnol J 2022; 20:496-507. [PMID: 35070171 PMCID: PMC8762368 DOI: 10.1016/j.csbj.2022.01.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 01/03/2022] [Accepted: 01/03/2022] [Indexed: 11/29/2022] Open
Abstract
Background Cox proportional hazard regression (CPH) model relies on the proportional hazard (PH) assumption: the hazard of variables is independent of time. CPH has been widely used to identify prognostic markers of the transcriptome. However, the comprehensive investigation on PH assumption in transcriptomic data has lacked. Results The whole transcriptomic data of the 9,056 patients from 32 cohorts of The Cancer Genome Atlas and the 3 lung cancer cohorts from Gene Expression Omnibus were collected to construct CPH model for each gene separately for fitting the overall survival. An average of 8.5% gene CPH models violated the PH assumption in TCGA pan-cancer cohorts. In the gene interaction networks, both hub and non-hub genes in CPH models were likely to have non-proportional hazards. Violations of PH assumption for the same gene models were not consistent in 5 non-small cell lung cancer datasets (all kappa coefficients < 0.2), indicating that the non-proportionality of gene CPH models depended on the datasets. Furthermore, the introduction of log(t) or sqrt(t) time-functions into CPH improved the performance of gene models on overall survival fitting in most tumors. The time-dependent CPH changed the significance of log hazard ratio of the 31.9% gene variables. Conclusions Our analysis resulted that non-proportional hazards should not be ignored in transcriptomic data. Introducing time interaction term ameliorated performance and interpretability of non-proportional hazards of transcriptome data in CPH.
Collapse
Key Words
- ACC, Adrenocortical carcinoma
- AIC, Akaike information criterion
- BLCA, Bladder Urothelial Carcinoma
- BRCA, Breast invasive carcinoma
- CESC, Cervical squamous cell carcinoma and endocervical adenocarcinoma
- CHOL, Cholangiocarcinoma
- COAD, Colon adenocarcinoma
- CON, Concordance regression
- CPH, Cox proportional hazard regression
- Cox regression
- DLBC, Lymphoid Neoplasm Diffuse Large B-cell Lymphoma
- ESCA, Esophageal carcinoma
- GBM, Glioblastoma multiforme
- GEO, Gene Expression Omnibus
- GO, Gene Ontology
- HNSC, Head and Neck squamous cell carcinoma
- KICH, Kidney Chromophobe
- KIRC, Kidney renal clear cell carcinoma
- KIRP, Kidney renal papillary cell carcinoma
- LGG, Brain Lower Grade Glioma
- LIHC, Liver hepatocellular carcinoma
- LUAD, Lung adenocarcinoma
- LUSC, Lung squamous cell carcinoma
- MESO, Mesothelioma
- OS, overall survival
- OV, Ovarian serous cystadenocarcinoma
- PAAD, Pancreatic adenocarcinoma
- PCPG, Pheochromocytoma and Paraganglioma
- PH, proportional hazard
- PRAD, Prostate adenocarcinoma
- Pan-cancer
- Proportional hazard assumption
- READ, Rectum adenocarcinoma
- SARC, Sarcoma
- SKCM, Skin Cutaneous Melanoma
- STAD, Stomach adenocarcinoma
- TCGA
- TCGA, The Cancer Genome Atlas
- TCGA, tumor abbreviations
- TGCT, Testicular Germ Cell Tumors
- THCA, Thyroid carcinoma
- THYM, Thymoma
- Transcriptome
- UCEC, Uterine Corpus Endometrial Carcinoma
- UCS, Uterine Carcinosarcoma
- UVM, Uveal Melanoma
Collapse
Affiliation(s)
- Zihang Zeng
- Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Yanping Gao
- Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Jiali Li
- Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Gong Zhang
- Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Shaoxing Sun
- Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Qiuji Wu
- Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Yan Gong
- Department of Biological Repositories, Zhongnan Hospital of Wuhan University, Wuhan, China.,Tumor Precision Diagnosis and Treatment Technology and Translational Medicine, Hubei Engineering Research Center, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Conghua Xie
- Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan, China.,Hubei Key Laboratory of Tumor Biological Behaviors, Zhongnan Hospital of Wuhan University, Wuhan, China.,Hubei Cancer Clinical Study Center, Zhongnan Hospital of Wuhan University, Wuhan, China
| |
Collapse
|
5
|
van Genugten CR, Schuurmans J, van Ballegooijen W, Hoogendoorn AW, Smit JH, Riper H. Discovering different profiles in the dynamics of depression based on real-time monitoring of mood: a first exploration. Internet Interv 2021; 26:100437. [PMID: 34458105 DOI: 10.1016/j.invent.2021.100437] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 07/19/2021] [Accepted: 07/23/2021] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND Although depression is typically characterized by a persistent depressed mood, mood dynamics do seem to vary across a depressed population. Heterogeneity of mood variability (magnitude of changes) and emotional inertia (speed at which mood shifts) is seen in clinical practice. However, studies investigating the heterogeneity of these mood dynamics are still scarce. The aim of the present study is to explore different distinctive profiles in real-time monitored mood dynamics among depressed persons. METHODS After completing baseline measures, mildly-to-moderately depressed persons (n = 37) were prompted to rate their current mood (1-10 scale) on their smartphones, 3 times a day for 7 consecutive days. Latent profile analyses were applied to identify profiles based on average mood, variability of mood and emotional inertia as reported by the participants. RESULTS Two profiles were identified in this sample. The overwhelming majority of the sample belonged to profile 1 (n = 31). Persons in profile 1 were characterized by a mood just above the cutoff for positive mood (M = 6.27), with smaller mood shifts (lower variability [SD = 1.05]) than those in profile 2 (n = 6), who displayed an overall negative mood (M = 4.72) and larger mood shifts (higher variability [SD = 1.95]) but at similar speed (emotional inertia) (AC = 0.19, AC = 0.26, respectively). CONCLUSIONS The present study provides preliminary indications for patterns of average mood and mood variability, but not emotional inertia, among mildly-to-moderately depressed persons.
Collapse
Key Words
- AC, autocorrelation
- AIC, Akaike information criterion
- BIC, Bayesian information criterion
- BLRT, bootstrapped likelihood ratio test
- CES-D, Center for Epidemiological Studies Depression Scale
- Cluster analysis
- DSM-5, Diagnostic manual of mental disorders, 5th edition
- Depression
- EMA, ecological momentary assessment
- Ecological momentary assessment
- Heterogeneity
- IQR, interquartile range
- LMRA-LRT, Lo-Mendell-Rubin adjusted likelihood ratio test
- LPA, latent profile analysis
- M, mean
- Mdn, median
- Mood dynamics
- Mood instability
- PHQ-9, Patient Health Questionnaire
- SD, Standard deviation
- VAS, Visual analogue scale
Collapse
|
6
|
Múdry P, Kýr M, Rohleder O, Mahdal M, Staniczková Zambo I, Ježová M, Tomáš T, Štěrba J. Improved osteosarcoma survival with addition of mifamurtide to conventional chemotherapy - Observational prospective single institution analysis. J Bone Oncol 2021; 28:100362. [PMID: 33948428 PMCID: PMC8080518 DOI: 10.1016/j.jbo.2021.100362] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 03/24/2021] [Accepted: 03/25/2021] [Indexed: 10/26/2022] Open
Abstract
Purpose Conventional osteosarcoma is an orphan disease. Current treatment approaches include combining a three drug chemotherapy schedule and surgery. The 3- and 5-year event-free survival (EFS) in localized disease is roughly 65 and 60%, respectively. The registration study of mifamurtide reported survival benefit, but some methodological controversies have been insufficient for FDA market authorization in contrast to EMA. Methods prospective single centre survival analysis of a mifamurtide addition to conventional therapy in 23 patients over a 5.5 year enrolment period is reported and compared to a historical control of 26 patient with localized disease. Bias arising from observational methodology was addressed using Landmark analysis and time-dependent Cox models. Blood count dynamics were analysed during the treatment. Results The adverse event profile was as expected with no dose limiting toxicities. There were no local relapses observed, one patient died in the first complete remission due to doxorubicin cardiotoxicity, one patient had pulmonary metastatic relapse. The observed 3- and 5-year EFS was 87.4% (CI 72.4-100%) and 87.4% (CI 72.4-100%), progression free survival (PFS) was 92.9% (CI 80.3-100%) and 92.9% (CI 80.3-100%), overall survival was 94.1% (CI 83.6-100) and 80.7% (CI 58.3-100), respectively. Comparison to the historical control showed statistically significant better PFS for mifamurtide patients (Landmark analysis; p = 0.044). Risk of progression was 5-times lower for the mifamurtide group (Cox model; HR 0.21, p = 0.136). Only subtle differences in lymphocyte counts were observed across treatment. Conclusion the PFS benefit of mifamurtide is reported herein. The addition of mifamurtide could be considered as a best treatment option for localized osteosarcoma.
Collapse
Key Words
- A/AP, adriamycin (doxorubicin)/adriamycin (doxorubicin) and cisplatin
- AIC, Akaike information criterion
- BIC, Bayesian information criterion
- CI, confidence interval
- CTCAE, common terminology criteria for adverse events
- Comparative analysis
- EFS, event free survival
- EMA, European Medicines Agency
- FDA, Food and Drug Administration
- HR, hazard ratio
- LY, lymphocytes
- M/F, male/female
- MFS, metastatic free survival
- MONO, monocytes
- MTX, methotrexate
- Mifamurtide
- NEU, neutrophiles
- Osteosarcoma
- PFS, progression free survival
- PLT, platelets
- R0 and R1 resection, free margins and microscopic rest after resection respectively
- SD, standard deviation
- Single institution analysis
- Survival
Collapse
Affiliation(s)
- Peter Múdry
- Department of Paediatric Oncology, University Hospital Brno and School of Medicine, Masaryk University, Cernopolni 9, Brno 613 00, Czech Republic.,International Clinical Research Centre, St. Anne's University Hospital Brno, Pekarska 53, Brno 656 91, Czech Republic
| | - Michal Kýr
- Department of Paediatric Oncology, University Hospital Brno and School of Medicine, Masaryk University, Cernopolni 9, Brno 613 00, Czech Republic.,International Clinical Research Centre, St. Anne's University Hospital Brno, Pekarska 53, Brno 656 91, Czech Republic
| | - Ondřej Rohleder
- Department of Paediatric Oncology, University Hospital Brno and School of Medicine, Masaryk University, Cernopolni 9, Brno 613 00, Czech Republic.,International Clinical Research Centre, St. Anne's University Hospital Brno, Pekarska 53, Brno 656 91, Czech Republic
| | - Michal Mahdal
- 1 Department of Orthopaedics, St. Annés University Hospital Brno and School of Medicine, Masaryk University, Pekarska 53, Brno 613 00, Czech Republic
| | - Iva Staniczková Zambo
- 1 Department of Pathology, St. Anne's University Hospital Brno and School of Medicine, Masaryk University, Pekarska 53, Brno 613 00, Czech Republic
| | - Marta Ježová
- Department of Pathology, University Hospital Brno and School of Medicine, Masaryk University, Jihlavska 20, Brno 625 00, Czech Republic
| | - Tomáš Tomáš
- 1 Department of Orthopaedics, St. Annés University Hospital Brno and School of Medicine, Masaryk University, Pekarska 53, Brno 613 00, Czech Republic
| | - Jaroslav Štěrba
- Department of Paediatric Oncology, University Hospital Brno and School of Medicine, Masaryk University, Cernopolni 9, Brno 613 00, Czech Republic.,International Clinical Research Centre, St. Anne's University Hospital Brno, Pekarska 53, Brno 656 91, Czech Republic
| |
Collapse
|
7
|
Hodel J, Ehrmann C, Scheel-Sailer A, Stucki G, Bickenbach JE, Prodinger B. Identification of Classes of Functioning Trajectories and Their Predictors in Individuals With Spinal Cord Injury Attending Initial Rehabilitation in Switzerland. Arch Rehabil Res Clin Transl 2021; 3:100121. [PMID: 34179757 PMCID: PMC8212008 DOI: 10.1016/j.arrct.2021.100121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Objectives To identify classes of functioning trajectories in individuals with spinal cord injury (SCI) undergoing initial rehabilitation after injury and to examine potential predictors of class membership to inform clinical planning of the rehabilitation process. Design Longitudinal analysis of the individual's rehabilitation stay using data from the Inception Cohort of the Swiss Spinal Cord Injury Cohort Study (SwiSCI). Setting Initial rehabilitation in specialized centers in Switzerland. Participants Individuals with newly acquired SCI (N=748; mean age, 54.66±18.38y) who completed initial rehabilitation between May 2013 and September 2019. The cohort was primarily composed of men (67.51%), persons with paraplegia (56.15%), incomplete injuries (67.51%), and traumatic etiologies (55.48%). Interventions Not applicable. Main Outcome Measures Functioning was operationalized with the interval-based sum score of the Spinal Cord Independence Measure version III (SCIM III). For each individual, the SCIM III sum score was assessed at up to 4 time points during rehabilitation stay. The corresponding time of assessment was recorded by the difference in days between the SCIM III assessment and admission to the rehabilitation program. Results Latent process mixed model analysis revealed 4 classes of functioning trajectories within the present sample. Class-specific predicted mean functioning trajectories describe stable high functioning (n=307; 41.04%), early functioning improvement (n=39; 5.21%), moderate functioning improvement (n=287; 38.37%), and slow functioning improvement (n=115; 15.37%), respectively. Out of 12 tested factors, multinomial logistic regression showed that age, injury level, injury severity, and ventilator assistance were robust predictors that could distinguish between identified classes of functioning trajectories in the present sample. Conclusions The current study establishes a foundation for future research on the course of functioning of individuals with SCI in initial rehabilitation by identifying classes of functioning trajectories. This supports the development of specifically tailored rehabilitation programs and prediction models, which can be integrated into clinical rehabilitation planning.
Collapse
Affiliation(s)
- Jsabel Hodel
- Swiss Paraplegic Research, Nottwil, Switzerland.,Department of Health Sciences and Medicine, University of Lucerne, Lucerne, Switzerland
| | - Cristina Ehrmann
- Swiss Paraplegic Research, Nottwil, Switzerland.,Department of Health Sciences and Medicine, University of Lucerne, Lucerne, Switzerland
| | - Anke Scheel-Sailer
- Department of Health Sciences and Medicine, University of Lucerne, Lucerne, Switzerland.,Swiss Paraplegic Centre, Nottwil, Switzerland
| | - Gerold Stucki
- Swiss Paraplegic Research, Nottwil, Switzerland.,Center for Rehabilitation in Global Health Systems, University of Lucerne, Lucerne, Switzerland
| | - Jerome E Bickenbach
- Swiss Paraplegic Research, Nottwil, Switzerland.,Department of Health Sciences and Medicine, University of Lucerne, Lucerne, Switzerland
| | - Birgit Prodinger
- Swiss Paraplegic Research, Nottwil, Switzerland.,Department of Health Sciences and Medicine, University of Lucerne, Lucerne, Switzerland.,Faculty of Applied Health and Social Sciences, Technical University of Applied Sciences Rosenheim, Rosenheim, Germany
| |
Collapse
|
8
|
Liu S, Song A, Zhou X, Huo Z, Yao S, Yang B, Liu Y, Wang Y. ceRNA network development and tumour-infiltrating immune cell analysis of metastatic breast cancer to bone. J Bone Oncol 2020; 24:100304. [PMID: 32760644 PMCID: PMC7393400 DOI: 10.1016/j.jbo.2020.100304] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 07/09/2020] [Accepted: 07/10/2020] [Indexed: 12/18/2022] Open
Abstract
PURPOSE Advanced breast cancer commonly metastasises to bone; however, the molecular mechanisms underlying the affinity for breast cancer cells to bone remains unclear. Thus, we developed nomograms based on a competing endogenous RNA (ceRNA) network and analysed tumour-infiltrating immune cells to elucidate the molecular pathways that may predict prognosis in patients with breast cancer. METHODS We obtained the RNA expression profile of 1091 primary breast cancer samples included in The Cancer Genome Atlas database, 58 of which were from patients with bone metastasis. We analysed the differential RNA expression patterns between breast cancer with and without bone metastasis and developed a ceRNA network. Cibersort was employed to differentiate between immune cell types based on tumour transcripts. Nomograms were then established based on the ceRNA network and immune cell analysis. The value of prognostic factors was evaluated by Kaplan-Meier survival analysis and a Cox proportional risk model. RESULTS We found significant differences in long non-coding RNAs (lncRNAs), 18 microRNAs (miRNAs), and 20 messenger RNAs (mRNAs) between breast cancer with and without bone metastasis, which were used to construct a ceRNA network. We found that the protein-coding genes GJB3, CAMMV, PTPRZ1, and FBN3 were significantly differentially expressed by Kaplan-Meier analysis. We also observed significant differences in the abundance of plasma cell and follicular helper T cell populations between the two groups. In addition, the proportion of mast cells, gamma delta T cells, and plasma cells differed depending on disease location and stage. Our analysis showed that a high proportion of follicular helper T cells and a low proportion of eosinophils promoted survival and that DLX6-AS1, Wnt6, and GABBR2 expression may be associated with bone metastasis in breast cancer. CONCLUSIONS We developed a bioinformatic tool for exploring the molecular mechanisms of bone metastasis in patients with breast cancer and identified factors that may predict the occurrence of bone metastasis.
Collapse
Key Words
- AIC, Akaike information criterion
- AUC, Area under curve
- Bone metastasis
- Breast cancer
- DE, Differentially expressed
- DEmRNA, differentially expressed messenger RNA
- EMT, epithelial-mesenchymal transition
- ER, estrogen receptor
- FPKM, fragments per kilobase per million mapped reads
- GO, Gene ontology
- HER2, human epidermal growth factor receptor 2
- Immune infiltration
- KEGG, Kyoto Encyclopedia of Genes and Genomes
- Nomogram
- PCC, Pearson correlation coefficient
- Prognosis
- ROC curve, receiver operating characteristic curve
- Runx2, runt related transcription factor 2
- TCGA, The Cancer Genome Atlas
- TNM, Tumor, Node, Metastases
- ceRNA network
- ceRNA, competing endogenous RNA
- lncRNA, long non-coding RNA
- mRNA, messenger RNA
- miRNA, microRNA
Collapse
Affiliation(s)
- Shuzhong Liu
- Department of Orthopaedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - An Song
- Department of Endocrinology, Key Laboratory of Endocrinology, National Health and Family Planning Commission, Peking Union Medical College Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Beijing, China
| | - Xi Zhou
- Department of Orthopaedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Zhen Huo
- Department of Pathology, Peking Union Medical College Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Beijing, China
| | - Siyuan Yao
- Department of Orthopaedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Bo Yang
- Department of Orthopaedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
- Corresponding authors at: Department of Orthopaedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, No. 1 Shuaifuyuan Wangfujing, Beijing 100730, China.
| | - Yong Liu
- Department of Orthopaedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
- Corresponding authors at: Department of Orthopaedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, No. 1 Shuaifuyuan Wangfujing, Beijing 100730, China.
| | - Yipeng Wang
- Department of Orthopaedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
- Corresponding authors at: Department of Orthopaedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, No. 1 Shuaifuyuan Wangfujing, Beijing 100730, China.
| |
Collapse
|
9
|
Li Y, Li H, Zhu S, Xie Y, Wang B, He L, Zhang D, Zhang Y, Yuan H, Wu C, Sun W, Zhang Y, Li M, Cui L, Cai Y, Wang J, Yang Y, Lv Q, Zhang L, Xie M. Prognostic Value of Right Ventricular Longitudinal Strain in Patients With COVID-19. JACC Cardiovasc Imaging 2020; 13:2287-2299. [PMID: 32654963 PMCID: PMC7195441 DOI: 10.1016/j.jcmg.2020.04.014] [Citation(s) in RCA: 299] [Impact Index Per Article: 74.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Revised: 04/23/2020] [Accepted: 04/24/2020] [Indexed: 02/07/2023]
Abstract
Objectives The aim of this study was to investigate whether right ventricular longitudinal strain (RVLS) was independently predictive of higher mortality in patients with coronavirus disease-2019 (COVID-19). Background RVLS obtained from 2-dimensional speckle-tracking echocardiography has been recently demonstrated to be a more accurate and sensitive tool to estimate right ventricular (RV) function. The prognostic value of RVLS in patients with COVID-19 remains unknown. Methods One hundred twenty consecutive patients with COVID-19 who underwent echocardiographic examinations were enrolled in our study. Conventional RV functional parameters, including RV fractional area change, tricuspid annular plane systolic excursion, and tricuspid tissue Doppler annular velocity, were obtained. RVLS was determined using 2-dimensional speckle-tracking echocardiography. RV function was categorized in tertiles of RVLS. Results Compared with patients in the highest RVLS tertile, those in the lowest tertile were more likely to have higher heart rate; elevated levels of D-dimer and C-reactive protein; more high-flow oxygen and invasive mechanical ventilation therapy; higher incidence of acute heart injury, acute respiratory distress syndrome, and deep vein thrombosis; and higher mortality. After a median follow-up period of 51 days, 18 patients died. Compared with survivors, nonsurvivors displayed enlarged right heart chambers, diminished RV function, and elevated pulmonary artery systolic pressure. Male sex, acute respiratory distress syndrome, RVLS, RV fractional area change, and tricuspid annular plane systolic excursion were significant univariate predictors of higher risk for mortality (p < 0.05 for all). A Cox model using RVLS (hazard ratio: 1.33; 95% confidence interval [CI]: 1.15 to 1.53; p < 0.001; Akaike information criterion = 129; C-index = 0.89) was found to predict higher mortality more accurately than a model with RV fractional area change (Akaike information criterion = 142, C-index = 0.84) and tricuspid annular plane systolic excursion (Akaike information criterion = 144, C-index = 0.83). The best cutoff value of RVLS for prediction of outcome was −23% (AUC: 0.87; p < 0.001; sensitivity, 94.4%; specificity, 64.7%). Conclusions RVLS is a powerful predictor of higher mortality in patients with COVID-19. These results support the application of RVLS to identify higher risk patients with COVID-19.
Collapse
Key Words
- 2D, 2-dimensional
- AIC, Akaike information criterion
- ARDS, acute respiratory distress syndrome
- CI, confidence interval
- COVID-19
- COVID-19, coronavirus disease-2019
- HR, hazard ratio
- LS, longitudinal strain
- LV, left ventricular
- LVEF, left ventricular ejection fraction
- PASP, pulmonary artery systolic pressure
- ROC, receiver-operating characteristic
- RV, right ventricular
- RVFAC, right ventricular fractional area change
- RVLS, right ventricular longitudinal strain
- SARS-CoV-2
- SARS-CoV-2, severe acute respiratory syndrome-coronavirus-2
- STE, speckle-tracking echocardiography
- S’, tricuspid lateral annular systolic velocity
- TAPSE, tricuspid annular plane systolic excursion
- TR, tricuspid regurgitation
- right ventricular function
- speckle tracking echocardiography
- strain
Collapse
Affiliation(s)
- Yuman Li
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - He Li
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Shuangshuang Zhu
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Yuji Xie
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Bin Wang
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Lin He
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Danqing Zhang
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Yongxing Zhang
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Hongliang Yuan
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Chun Wu
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Wei Sun
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Yanting Zhang
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Meng Li
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Li Cui
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Yu Cai
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Jing Wang
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Yali Yang
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Qing Lv
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Li Zhang
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China.
| | - Mingxing Xie
- Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China.
| |
Collapse
|
10
|
Abstract
Pertussis remains a challenging public health problem with many aspects of infection, disease and immunity poorly understood. Initially controlled by mass vaccination, pertussis resurgence has occurred in some countries with well-established vaccination programs, particularly among adolescents and young adults. Several studies have used mathematical models to investigate drivers of pertussis epidemiology and predict the likely impact of different vaccination strategies. We reviewed a number of these models to evaluate their suitability to answer questions of public health importance regarding optimal vaccine scheduling. We critically discuss the approaches adopted and the impact of chosen model structures and assumptions on study conclusions. Common limitations were a lack of contemporary, population relevant data for parameterization and a limited understanding of the relationship between infection and disease. We make recommendations for future model development and suggest epidemiologic data collections that would facilitate efforts to reduce uncertainty and improve the robustness of model-derived conclusions.
Collapse
Key Words
- AIC, Akaike information criterion
- E, infected but not yet infectious compartment
- I, infectious compartment
- POLYMOD, European Union funded project
- R, removed/immune compartment
- S, susceptible compartment
- UK, United Kingdom
- US, United States
- W, waned immunity compartment
- WAIFW, who acquires infection from whom
- WHO, World Health Organization
- infectious disease dynamics
- mathematical modeling
- pertussis
- transmission
- vaccines
- λ or FOI, force of infection
Collapse
Affiliation(s)
- Patricia T Campbell
- a Melbourne School of Population and Global Health; The University of Melbourne ; Parkville , Australia
| | | | | |
Collapse
|
11
|
Abstract
A new generalization of the Lindley distribution is recently proposed by Ghitany et al. [1], called as the power Lindley distribution. Another generalization of the Lindley distribution was introduced by Nadarajah et al. [2], named as the generalized Lindley distribution. This paper proposes a more generalization of the Lindley distribution which generalizes the two. We refer to this new generalization as the exponentiated power Lindley distribution. The new distribution is important since it contains as special sub-models some widely well-known distributions in addition to the above two models, such as the Lindley distribution among many others. It also provides more flexibility to analyze complex real data sets. We study some statistical properties for the new distribution. We discuss maximum likelihood estimation of the distribution parameters. Least square estimation is used to evaluate the parameters. Three algorithms are proposed for generating random data from the proposed distribution. An application of the model to a real data set is analyzed using the new distribution, which shows that the exponentiated power Lindley distribution can be used quite effectively in analyzing real lifetime data.
Collapse
Key Words
- AIC, Akaike information criterion
- BGLD, Beta generalized Lindley distribution
- BIC, Bayesian information criterion
- Cdf, Cumulative distribution function
- E(Xr), The rth moment
- EE, Exponentiated exponential distribution
- EPLD, Exponentiated power Lindley distribution
- GLD, Generalized Lindley distribution
- K–S, Kolmogorov–Smirnov test
- LD, Lindley distribution
- LSE, Least square estimator
- Lambert function
- Least square estimation
- MLE, Maximum likelihood estimator
- MSE, mean square error
- MW, Modified Weibull distribution
- MX(t), The moment generating function
- Maximum likelihood estimation
- Order statistics
- PLD, Power Lindley distribution
- Power Lindley distribution
- Q(p), Quantile function
- WD, Weibull distribution
- [Formula: see text], Log-likelihood function
- h(t), Hazard rate function
- pdf, Probability density function
Collapse
|