[Rituximab for treatment of Felty’s syndrome]

The Use of Abatacept for the Treatment of Felty Syndrome in Rheumatoid Arthritis

Felty syndrome is characterized by a triad of rheumatoid arthritis, neutropenia, and splenomegaly that typically occurs in patients with seropositive rheumatoid arthritis. We report a case of an 81-year-old man with a 22-year history of rheumatoid arthritis who developed pancytopenia and neutropenia for one month. An abdominal ultrasound revealed splenomegaly. A bone marrow biopsy excluded large granular lymphocytic leukemia, thus Felty Syndrome was diagnosed. He was treated with a maximum tolerated dose of methotrexate (15 mg once a week) for two months with no improvement in absolute neutrophil count. The patient was given abatacept 1000 mg intravenously every four weeks with improvement in hemoglobin, leukocyte, and platelet counts and absolute neutrophil counts from 0.2 to 2.4 K/µl.

Biological treatment in Felty's syndrome with profound neutropenia

A triad of symptoms characterises Felty's syndrome: seropositive rheumatoid arthritis (RA), splenomegaly and neutropenia. The treatment of Felty's syndrome is based on using classic synthetic and biological disease-modifying anti-rheumatic drugs (DMARDs). In this article, we present a case of a patient with Felty's syndrome who was treated with biologic treatment. A systematic search of the literature on the electronic medical database was conducted. The drugs from the DMARD group, despite reducing the activity of the disease, may cause significant clinical complications. It is important to know about the diagnosis, differentiation and treatment of neutropenia and the prevention of febrile neutropenia. The article discusses the current therapeutic possibilities using both classical and biologic DMARDs.

Porto-Sinusoidal Vascular Disease as the Cause of Portal Hypertension in Felty's Syndrome: A Case Report and Literature Review

Felty's syndrome (FS) is a disorder wherein patients with rheumatoid arthritis develop splenomegaly, neutropenia, and in some cases, portal hypertension without underlying cirrhosis. Esophageal variceal bleeding is a complication of FS in patients with portal hypertension. In contrast to splenectomy, few reports exist on the management of variceal bleeding with endoscopic therapy. Moreover, the long-term outcome has not been reported. We present a patient with esophageal variceal bleeding due to portal hypertension secondary to Felty's syndrome. The patient was followed up for two years postendoscopy intervention. Literature review was performed and the histological features of portal hypertension in FS are discussed. The patient presented with a typical triad of rheumatoid arthritis (RA), splenomegaly, and neutropenia and was diagnosed as Felty's syndrome in 2012. She was admitted to our hospital in September 2017 for esophageal variceal bleeding. At the time of admission, her liver function test was normal. Abdominal CT showed no signs of cirrhosis and portal vein obstruction. Liver biopsy further excluded diagnosis of cirrhosis and supported the diagnosis of porto-sinusoidal vascular disease (PSVD), which was previously named as noncirrhotic idiopathic portal hypertension (NCIPH). An upper abdominal endoscopy revealed gastric and esophageal varices. A series of endoscopies was performed to ligate the esophageal varices. The patient was followed up for two years and did not show rebleeding. In conclusion, comorbid PSVD might be a cause of portal hypertension in FS patients. The present case had excellent outcome in two years, which supported the use of endoscopic therapy for the management of variceal bleeding in FS patients. Further large prospective study is needed to confirm the findings.

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Zusammenfassung. Das Felty-Syndrom ist eine komplizierte und seltene Form der rheumatoiden Arthritis mit Splenomegalie und Neutropenie, das von A. R. Felty im Jahr 1924 erstmals beschrieben wurde und dessen Diagnose klinisch gestellt wird. Das Felty-Syndrom geht mit hoher Entzündungs- und regelmässig hoher Krankheitsaktivität einher. Die Prognose ist aufgrund der hohen Inzidenz von Infekten schlecht. Die Ursache ist noch unklar; diskutiert werden eine chronische Entzündungsreaktion und eine entsprechende individuelle Disposition. Differenzialdiagnostisch müssen maligne Erkrankungen des Blutes ausgeschlossen werden. Die Therapie der Wahl ist Methotrexat, bei fehlendem Ansprechen können andere DMARDs (Disease-Modifying Anti-Rheumatic Drugs) in Erwägung gezogen werden; die Therapie mit Steroiden in der akuten Infektsituation ist kontrovers. Weitere Therapieoptionen wurden bisher nur in kleinen Fallstudien beschrieben. Von TNF-α-Inhibitoren wurde in einer Kleinstudie mit sechs Patienten über Unwirksamkeit berichtet. Der CD-20-Antagonist Rituximab (Mabthera®) hat in einer Studie mit acht Patienten bei der Mehrheit (n = 5) einen Anstieg der neutrophilen Granulozyten gezeigt. Als Wirkmechanismus wird eine Einflussnahme auf Anti-G-CSF-Antikörper diskutiert.