How should we approach classification of autoinflammatory diseases?

Area of Science:

• Immunology
• Genetics
• Clinical Medicine

Background:

• The concept of autoinflammatory diseases has evolved significantly since the late 1990s.
• Advances in understanding the innate immune system, particularly IL-1β and inflammasomes, have shaped current definitions.
• Existing definitions and classifications present structural and content challenges.

Purpose of the Study:

• To propose a clinically-oriented definition of autoinflammatory diseases.
• To introduce a clinically-based classification system for these conditions.
• To discuss the placement of autoinflammatory diseases within a continuum of immunological disorders.

Main Methods:

• Development of a new definition based on clinical signs, acute-phase reactants, and innate immune system dysfunction.
• Proposal of a classification system derived from the new definition.
• Application of philosophical concepts (family resemblance, signature) for multidimensional classification.

Main Results:

• A proposed definition: autoinflammatory diseases exhibit clinical inflammation, elevated acute-phase reactants, and are linked to innate immune dysfunction (genetic or endogenous trigger).
• A clinically-based classification framework for autoinflammatory diseases is presented.
• A multidimensional approach is advocated for classifying immunological diseases, including autoimmune conditions.

Conclusions:

• The proposed definition and classification offer a more clinically relevant framework for autoinflammatory diseases.
• A multidimensional classification is essential for understanding the continuum of immunological diseases.
• This work refines the understanding and categorization of autoinflammatory conditions.