[Tumor necrosis receptor associated periodic syndrome (TRAPS): State of the art]

Tumour necrosis receptor associated periodic syndrome (TRAPS) is a rare cosmopolitan dominant autosomal disease that belongs to the group of recurrent autoinflammatory syndromes. TRAPS is characterized by recurrent bouts of fever lasting more than 7 days, with arthralgia, myalgia, abdominal pain, erythematous rash and sometimes ocular symptoms. During flares, raised inflammatory markers are constant. The age of onset may occur during childhood but also during adulthood. TRAPS is caused by mutations in the TNF receptor 1 (TNFRSF1A) gene that may occur in most of the populations over the world. In the majority of patients, history shows affected relatives, even if sporadic cases do exist. Management of TRAPS usually involves corticosteroid therapy during inflammatory flares. The most severe cases require a treatment with biological agents (mainly interleukin 1 inhibitors). The prognosis of TRAPS is overall good; the main risk is represented by the development of secondary inflammatory amyloidosis. This risk is greatest in patients with structural mutations leading to conformation abnormalities of the TNFRSF1A receptor. Regular clinical and biological monitoring is essential in the follow-up of TRAPS patients.