PROS1 and systemic lupus erythematosus: It should be noted that an extensive number of etiologies have been cited as potential causes of secondary EPS, including abdominal TB, cytomegalovirus peritonitis, granulomatous peritonitis due to parasitic infection, recurrent peritonitis, sarcoidosis, systemic lupus erythematosus, familial Mediterranean fever, and protein S deficiency [15].