• Immunopathology and immune complex–driven mechanisms became a unifying paradigm for autoimmune diseases in the period, employing ANA, immune complexes, and immunofluorescent localization to connect serology with organ pathology [1], [5], [7], [13], [18].

• Development and refinement of diagnostic and classification criteria for systemic lupus erythematosus and rheumatoid arthritis, providing standardized research and clinical decision frameworks [9], [10].

• Autoantibody and serologic profiling as diagnostic markers and putative pathogenic factors across autoimmune conditions, including anti-DNA antibodies, rheumatoid factor, γ-globulin complexes, and related serologies [2], [6], [14], [17], [19].

• Renal involvement and nephritis as a focal arena for autoimmune disease research, illustrating immune complex and complement–mediated kidney pathology and informing prognosis and therapy [1], [5], [7], [13], [20].

• Systemic and vascular manifestations of autoimmune disease, including peripheral vascular obstruction and vascular lesions in rheumatoid arthritis, highlighting cross-organ impact and vascular biology in autoimmunity [8], [11], [12].