Practical and Relevant Guidelines for the Management of Psoriasis: An Inference-Based Methodology.

Psoriasis (Pso) is a common, immune-mediated, chronic-relapsing, inflammatory skin disease. While a great deal is known about Pso and its treatment, there remain several treatment scenarios unaddressed by clinical studies. To be effective, treatment for Pso must alter the activity of one or more immunological pathways important in the pathogenesis of the disease. While the benefit of blocking these pathways may be apparent, there remain uncertainties regarding safety, such as infections, malignancies, and the potential for off-target effects. Existing guidelines and treatment recommendations rely primarily on clinical trial or observational data, none of which adequately address specific clinical challenges. This document describes a methodological framework for generating practical and clinically relevant guidance for situations where direct evidence is rare or absent. Guidelines implementing this framework are currently ongoing. We develop a knowledge synthesis approach to guideline development, utilizing clinical trial data where available, and a formalized inferential decision-making process that considers indirect data coupled with structured expert opinion and analysis. This approach is best suited for situations where direct, high-level evidence is lacking. Support for each resultant recommendation is expressed as a quantified assessment of confidence. The topics to be addressed by this set of guidelines are ranked by clinicians and patients as areas of concern, with an emphasis on topics where high-level evidence may have limited availability. Through this novel approach, we will derive practical, informative recommendations using the best evidence available in combination with structured expert opinion to guide best practices in complex, real-world settings. Supplementary file2 (MP4 98653 kb). Clinical guidelines aim to assist doctors in managing their patients’ medical conditions. A limitation of current guidelines is that they are frequently based on randomized clinical research trials—often considered the gold standard in medical research. Clinical trials are designed to estimate the safety and effectiveness of treatment. Outside of clinical trials, doctors encounter a range of patient cases excluded from clinical trials. Our group aims to create guidelines for those clinical scenarios not adequately addressed by clinical trials. Examples include patients excluded from clinical trials, the elderly, patients with human immunodeficiency virus (HIV), and pregnant or breastfeeding women. When clinical trial data is limited, doctors must make decisions nonetheless. In certain clinical situations they are left to their own resources to consult with experts, review the data, and make inferences based on the limited data available. Instead of concluding that there is no data, the topic of interest can be broken down into components that are answerable by different types of research studies. This inference-based approach uses expert opinion and indirect evidence to support an inference-based position on topics where direct clinical data is sparse or insufficient to answer the question. This approach can be used as a complement to clinical trial data informing disease management guidelines.

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