The invention relates to the diagnosis and treatment of diseases, including inflammatory disorders, proliferative disorders and autoimmune diseases. The invention provides, and involves the use of, antibody molecules that bind: i) lysozyme, ii) neutrophil elastase, iii) tissue inhibitor of metalloproteinase-1 (TIMP-1), or iv) the D domain of Tenascin-C. The invention also relates to the use of antibody molecules that bind v) the IIICS isoform of fibronectin, vi) the Extra Domain-B (ED-B) of fibronectin, vii) matrix-metalloproteinase 3 (MMP3), or viii) the A1 domain of tenascin-C in the diagnosis and treatment of inflammatory disorders such as inflammatory bowel disease.