Clinical Trials with Missing Data

Missing Data in Clinical Studies provides a comprehensive account of the problems arising when data from clinical and related studies are incomplete, and presents the reader with approaches to effectively address them. The text provides a critique of conventional and simple methods before moving on to discuss more advanced approaches. The authors focus on practical and modeling concepts, providing an extensive set of case studies to illustrate the problems described. Provides a practical guide to the analysis of clinical trials and related studies with missing data. Examines the problems caused by missing data, enabling a complete understanding of how to overcome them. Presents conventional, simple methods to tackle these problems, before addressing more advanced approaches, including sensitivity analysis, and the MAR missingness mechanism. Illustrated throughout with real-life case studies and worked examples from clinical trials. Details the use and implementation of the necessary statistical software, primarily SAS. Missing Data in Clinical Studies has been developed through a series of courses and lectures. Its practical approach will appeal to applied statisticians and biomedical researchers, in particular those in the biopharmaceutical industry, medical and public health organisations. Graduate students of biostatistics will also find much of benefit.

It is quite common in a randomized clinical trial (RCT) to encounter patients who do not comply with their assigned treatment. Since noncompliance often occurs non-randomly, the commonly-used approaches, including both the as-treated (AT) and as-protocol (AP) analysis, and the intent-to-treat (ITT) (or as-randomized) analysis, are all well known to possibly produce a biased inference of the treatment efficacy. This book provides a systematic and organized approach to analyzing data for RCTs with noncompliance under the most frequently-encountered situations. These include parallel sampling, stratified sampling, cluster sampling, parallel sampling with subsequent missing outcomes, and a series of dependent Bernoulli sampling for repeated measurements. The author provides a comprehensive approach by using contingency tables to illustrate the latent probability structure of observed data. Using real-life examples, computer-simulated data and exercises in each chapter, the book illustrates the underlying theory in an accessible, and easy to understand way. Key features: Consort-flow diagrams and numerical examples are used to illustrate the bias of commonly used approaches, such as, AT analysis, AP analysis and ITT analysis for a RCT with noncompliance. Real-life examples are used throughout the book to explain the practical usefulness of test procedures and estimators. Each chapter is self-contained, allowing the book to be used as a reference source. Includes SAS programs which can be easily modified in calculating the required sample size. Biostatisticians, clinicians, researchers and data analysts working in pharmaceutical industries will benefit from this book. This text can also be used as supplemental material for a course focusing on clinical statistics or experimental trials in epidemiology, psychology and sociology.

This comprehensive, unified text on the principles and practice of clinical trials presents a detailed account of how to conduct the trials. It describes the design, analysis, and interpretation of clinical trials in a non-technical manner and provides a general perspective on their historical development, current status, and future strategy. Features examples derived from the author's personal experience.

Randomi sed Clinical Trials: Design, Practice and Reporting  provides a detailed overview of the methodology for conducting clinical trials, including developing protocols, data capture, randomisation, analysis and reporting. Assuming no prior background, this user-friendly resource describes the statistical, regulatory, and practical components required for conducting randomised clinical trials. Numerous examples and case studies from industry, academia, and the research literature help readers understand each stage of the clinical trial process.  This second edition contains extensively revised material throughout, including new chapters covering designs for repeated measures, non-inferiority, cluster and stepped wedge trials. Other new chapters describe data and safety monitoring, biomarker studies, and feasibility studies. Updated and expanded sections discuss situations where multiple organs, different body locations or competing risks are involved, subgroup analysis, and multiple outcomes. Written by an author team with extensive experience in conducting clinical trials, this book:  Provides comprehensive coverage of randomised clinical trials, ranging from basic to advanced Features several new chapters, updated case studies and examples, and references to changes in regulations Explains basic randomised trials, including the parallel two-group controlled trial with a single outcome measure Covers paired trial designs and trials with more than two interventions Includes a chapter on miscellaneous topics such as adaptive designs, large simple trials, Bayesian methods for very small trials, alpha-spending functions and the predictive probability test  Randomi sed Clinical Trials  is essential reading for clinicians, nurses, data managers, and medical statisticians involved in clinical trials, and for health practitioners responsible for direct patient care in a clinical trial setting.

Provides an introduction to the various statistical techniques involved in medical research and drug development with a focus on estimating the success probability of an experiment Success Probability Estimation with Applications to Clinical Trials details the use of success probability estimation in both the planning and analyzing of clinical trials and in widely used statistical tests. Devoted to both statisticians and non-statisticians who are involved in clinical trials, Part I of the book presents new concepts related to success probability estimation and their usefulness in clinical trials, and each section begins with a non-technical explanation of the presented concepts. Part II delves deeper into the techniques for success probability estimation and features applications to both reproducibility probability estimation and conservative sample size estimation. Success Probability Estimation with Applications to Clinical Trials: • Addresses the theoretical and practical aspects of the topic and introduces new and promising techniques in the statistical and pharmaceutical industries Features practical solutions for problems that are often encountered in clinical trials Includes success probability estimation for widely used statistical tests, such as parametric and nonparametric models Focuses on experimental planning, specifically the sample size of clinical trials using phase II results and data for planning phase III trials Introduces statistical concepts related to success probability estimation and their usefulness in clinical trials Success Probability Estimation with Applications to Clinical Trials is an ideal reference for statisticians and biostatisticians in the pharmaceutical industry as well as researchers and practitioners in medical centers who are actively involved in health policy, clinical research, and the design and evaluation of clinical trials.

What will happen during and after a clinical trial? How will a trial affect my quality of life? What are the benefits and risks of a trial? What does giving consent mean and what will it involve? Will I incur costs during and because of the trial? These are the questions that should be raised every time a health care professional talks through with a patient the pros and cons of entering a clinical trial. Clinical Trials Explained has been designed in consultation with doctors and patients who have taken part in trials, providing an essential and detailed guide to the clinical trials process. It therefore helps both clinicians and patients make well-informed decisions on whether to take part in a clinical trial.

The pace of therapeutic advances in the treatment of cardiovascular diseases is rapid, and new clinically-relevant information appears with such frequency that it can be extremely challenging for clinicians to keep up. Still, knowledge and interpretation of major clinical trials is crucial for the range of clinicians who manage cardiovascular patients, especially since important trial evidence often needs to be implemented soon after it is published. Confidently apply gold standard treatment for 10 of the most critical areas of cardiology Written by an international team of experts, Cardiovascular Clinical Trials: Putting the Evidence into Practice: Provides a succinct overview of recent major clinical trials – the gold standard for all medical treatment – across all the major cardiovascular subspecialties, to ensure you’re up-to-date on the most critical findings Guides cardiology trainees and clinicians on how cardiovascular clinical trials are designed and conducted, including statistical methodology, so you can conduct and/or appraise future trials yourself Addresses methodology as well as clinical effectiveness Offers evidence-based assessments on the most effective treatments and authoritative clinical information on management of the conditions so you can confidently apply what you learn Physicians, surgeons, specialist nurses – any clinician seeking an accessible resource for designing and conducting cardiovascular trials and then translating their results into practice will appreciate this book’s clear guidance and succinct and practical approach.

As a result of the expansion in the area of pharmaceutical medicine there is an ever-increasing need for educational resources. The Dictionary of Clinical Trials, Second Edition comprehensively explains the 3000 words and short phrases commonly used when designing, running, analysing and reporting clinical trials. This book is a quick, pocket reference tool to understand the common and less well-used terms within the discipline of clinical trials, and provides an alternative to the textbooks available. Terms are heavily cross-referenced, which helps the reader to understand how terms fit into the broad picture of clinical trials. Wide ranging, brief, pragmatic explanations of clinical trial terminology Scope includes medical, statistical, epidemiological, ethical, regulatory and data management terminology Thoroughly revised and expanded – increase of 280 terms from First Edition, reference to Cochrane included From the reviews of the First Edition: «This invaluable text explains the majority of clinical trial terms, in alphabetical order, that are likely to be found in clinical trial protocols, reports, regulatory guidelines, and published manuscripts… Fully comprehensive – provides definitions of clinical trial terms in one complete volume… Includes extensive use of graphs throughout.» LA DOC STI «…covers a range of subject matter, with emphasis on medical, statistical, epidemiological and ethical terms… a useful adjunct to standard clinical trial texts… a reference source to keep within easy reach.» TALANTA The Dictionary of Clinical Trials, Second Edition is a ‘must-have’ for all pharmaceutical companies who conduct a lot of clinical trials, in all or one therapeutic area. The book is also of interest for public health and health science workers, and for contract research organisations and departments of medicine, where medics are involved with clinical trials.

At last – a new edition of the highly acclaimed book Clinical Trials in Psychiatry This book provides a concise but thorough overview of clinical trials in psychiatry, invaluable to those seeking solutions to numerous problems relating to design, methodology and analysis of such trials. Practical examples and applications are used to ground theory whenever possible. The Second Edition includes new information regarding: Recent important psychiatric trials More specific discussion of psychiatry in the USA and the particular problems of trials in the USA, including comments about the FDA (U.S. Food and Drug Administration) An extended chapter on meta-analysis Further discussion of sub-group analysis Special features include appendices outlining how to design and report clinical trials, what websites and software programs are appropriate and an extensive reference section. From the reviews of the First Edition: “Everitt & Wessely are to be congratulated on producing an excellent guide to help overcome the snags in clinical trial research. Clearly written and in an engrossing style, the book is likely to become a classic textbook on clinical trials, and not just in psychiatry. The authors’ enthusiasm and grasp of clinical trial research make for a gripping and insightful read…it is one of the very best books that has been written on clinical trials.” THE BRITISH JOURNAL OF PSYCHIATRY "The experience of both authors in this area gives the book a very pragmatic approach grounded in reality, with theoretical overviews invariably being followed by practical examples and applications… an invaluable companion to anyone involved in, or contemplating undertaking, clinical trials research.” PSYCHOLOGICAL MEDICINE