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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

The epidemiology of epilepsy : remission, mortality, secular trends, and economic cost

Cockerell, Oliver Charles January 1995 (has links)
No description available.

Reappraising prognosis in chronic lymphocytic leukemia

Baliakas, Panagiotis January 2016 (has links)
Chronic lymphocytic leukemia (CLL) exhibits remarkable clinical heterogeneity likely reflecting the underlying biological heterogeneity. The genetic landscape of CLL has been recently enriched with mutations within a number of genes proposed as novel prognostic markers. Mounting evidence also supports the pivotal role of the clonotypic B-cell receptor immunoglobulin (BcR IG) in the natural history of CLL. Interestingly, almost 30% of all CLL patients can be assigned to different patient subsets, each defined by expression of a distinct stereotyped BcR IG. Whether stereotyped subsets exhibit distinct clinical behavior is still an issue of debate. The aim of this thesis was to evaluate the prognostic relevance of recurrent gene mutations and to assess the clinicobiological associations and clinical impact of BcR IG stereotypy in CLL. In a cohort of 3490 patients, NOTCH1, SF3B1 and TP53 mutations were enriched within clinically aggressive cases carrying unmutated IGHV genes (U-CLL), frequently co-occurring with trisomy 12, del(11q) and del(17p), respectively. Of note, SF3B1 mutations increased in parallel with increasing timespan between diagnosis and mutational screening. NOTCH1 mutations, SF3B1 mutations and TP53 abnormalities (TP53abs, deletions and/or mutations) correlated with shorter time-to-first-treatment among early stage cases, while in multivariate analysis, only SF3B1 mutations and TP53abs retained independent significance. In a series of 8593 CLL patients, stereotyped subsets showed marked differences in demographics, clinical presentation, cytogenetic aberrations and gene mutational spectrum. Patients within a specific subset generally followed similar clinical courses, whereas patients in different stereotyped subsets—even when displaying similar IG somatic hypermutation status— experienced significantly different clinical outcome. In particular, subset #2 (IGHV3-21/IGLV3-21), the largest overall, was found to exhibit (i) a remarkably high incidence of SF3B1 mutations (44%), alluding to subset-biased acquisition of genomic aberrations, in the context of particular antigenic stimulation; and, (ii) a dismal clinical outcome, distinct from the remaining IGHV3-21 CLL. Our findings strongly support the adverse clinical impact of SF3B1 mutations in CLL in addition to TP53abs. BcR IG stereotypy also emerges as prognostically relevant, further highlighting that an immunogenetic sub-classification of CLL based on BcR IG configuration could refine patient risk stratification.

Prognosis of breast cancer : a survival analysis of 1184 patients with 4-10 years follow-up, illustrating the relative importance of estrogen receptors, axillary nodes, clinical stage and tumor necrosis

Shek, Lydia L. M. January 1988 (has links)
Prognostic indicators, measured at diagnosis, are important in breast cancer. They help clinicians select optimal treatment, provide rational bases for stratification of treatment trials and assist analysis of response to treatment. Univariate statistical survival curves have identified many such indicators. However, they do not explain why some patients, classified as favoured by one or other factor(s), experience early treatment failure, nor why a substantial number with unfavourable signs remain recurrence-free many years later. This study was undertaken to identify independent prognostic factors with the use of multivariate regression. A Cox proportional hazards model of disease-specific survival was based on 1184 primary breast cancer patients referred to the Cancer Control Agency of B.C. between 1975 and 1981 (median follow-up 60 months). Significant univariate associations with overall survival were found for estrogen receptor concentration ([ER]), axillary nodal status (NO, Nl-3, N4+), clinical stage (TNM I, II, III, IV), histologic differentiation and confluent tumor necrosis (minimal, marked). These factors were assessed at primary diagnosis. A subset of 859 patients with complete data on these variables and also histologic type, menopausal status, age, tumor size and treatment was used to fit the multivariate model. Nodal status was the most important independent factor but three others, TNM stage, [ER] and tumor necrosis, were needed to make adequate predictions. A derived Hazard Index defined risk groups with 8-fold variation in survival. Five-year predicted survival ranged from 36% (N4+, loge[ER]=0, marked necrosis) to 96% (NO, loge[ER]=6, no necrosis) with TNM I and 0% to 70% for the same categories in TNM IV. This wide variation occurred across all stages. Study of post-recurrence survival (369 patients) yielded a model with only three independent predictors: [ER], nodal status and tumor necrosis. Survival - overall, recurrence-free and post-recurrent - is predictable by modelling a few factors measureable at diagnosis. Use of ER concentration, rather than the more common ER status (+ or -), greatly strengthens the model. Presence of ER was also shown to be increasingly important as 'protective', attenuating the effect of other factors, as risk of mortality increases. / Medicine, Faculty of / Pathology and Laboratory Medicine, Department of / Graduate


Davis, Philip 25 June 2013 (has links)
The Canadian population is aging and issues related to the care of older adults are becoming increasingly common. The practice of general surgery is no stranger to this phenomenon, as older adults are increasingly presenting for surgery. Some 40% of these surgeries occur on a non-elective basis, which is associated with increased morbidity and mortality when compared to elective surgery. However, very little research has been done on prognostic factors for poor post-operative outcomes in older adults presenting for non-elective surgery. Thus, the purpose of this research is three-fold. First, to review the literature on prognostic factors for adverse outcomes in this patient population. Second, to examine prognostic factors associated with mortality in this patient population. Lastly, to examine prognostic factors associated with discharge to institution in this patient population.

Predictors of relapse in first-episode schizophrenia and related psychosis

Hui, Lai-ming, Christy., 許麗明. January 2009 (has links)
published_or_final_version / Psychiatry / Doctoral / Doctor of Philosophy

Prognosis prediction and management decision for patients with community acquired pneumonia

Man, Shin-yan., 萬善仁. January 2007 (has links)
published_or_final_version / Medicine / Master / Master of Medical Sciences

Evaluation of novel prognostic factors In ovarian carcinoma

Advikolanu, Kavitha Muralidhar 01 January 1999 (has links)
Clinical information was collected from 283 randomly chosen ovarian cancer cases from at the Saskatoon Cancer Centre between the years 1983-1995. The data was evaluated for its significance in predicting survival and relapse free survival (RFS) using univariate and multivariate analysis. Several clinical prognostic factors were identified by univariate analysis. Additionally, using Cox's regression model the independent markers of survival and RFS were FIGO stage, and residual disease in 173 and 178 patients respectively. Data on CA 125 serum level, (available in 89 patients) was a marker of prognostic significance in the patients treated with platinum based chemotherapy. CA 125 and CEA antigen expression were also evaluated in seventy one cases. It was found that mucinous neoplasms exclusively expressed CEA antigen. This study indicates that the evaluation of serum level CEA may be a complementary tool for patients with cancers not expressing CA 125. In this retrospective study, DNA from paraffin embedded tissue (PET) in patients with ovarian carcinoma was examined to identify gene abnormalities in p53, p16INK4A, RB-1, p21WAF1/CIP1, Cyclin D1, Erb-B2, and MSH2. Adverse outcome was also examined in addition to survival and RFS, to identify novel molecular prognostic markers. P53 overexpression in 44 of 112 (39%) was associated with reduced survival and RFS (' p' = '0.04' and 'p' = '0.008 '). Aneuploid DNA content, found in 34 of 112 (30%) cases, was associated with shorter survival and RFS ('p' = '0.03' and 'p' = '0.01'). Dot blot hybridization of G1-S control genes (p16INK4A, Cyclin D1, RB-1, and CDK4) did not identify amplification or deletion events to be associated with adverse outcome. A number of gene alterations in 59 of 63 (94%) ovarian cancer cases were detected by dot blot hybridization; the lack of association with clinical outcome indicated that there may be some other genes in addition to those examined that are of prognostic significance. For eighteen cases, microsatellite instability (MSI) was evaluated by using fluorescently labeled primers at nine loci. LOH was a common event in ovarian carcinoma but MSI was infrequent. Molecular and clinical marker multivariate analysis indicated: (a) residual disease for survival, (b) stage and residual disease for RFS, were independent markers of prognosis.


No description available.

A statistical evaluation of endodontic prognosis using radiographic criteria this thesis is submitted in partial fulfillment ... in endodontics and radiology ... /

Cohen, Philip William. January 1968 (has links)
Thesis (M.S.)--University of Michigan, 1968.

Quantifying and comparing the predictive accuracy of prognostic factors /

Moskowitz, Chaya S. January 2002 (has links)
Thesis (Ph. D.)--University of Washington, 2002. / Vita. Includes bibliographical references (p. 149-154).

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