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Successful therapy of retroperitoneal fibrosis due to IgG4-related disease with rituximab, cyclophosphamide and glucocorticoids followed by maintenance therapy wit ritutixmab


Authors: Zdeněk Adam 1;  Aleš Čermák 2;  Hana Petrášová 3;  Zdeněk Řehák 4;  Renata Koukalová 4;  Zdeněk Fojtík 1;  Luděk Pour 1;  Ivanna Boichuk 1;  Marta Krejčí 1;  Zdeněk Král 1;  Petr Benda 5
Authors‘ workplace: Interní hematologická a onkologická klinika LF MU a FN Brno 1;  Urologická klinika LF MU a FN Brno 2;  Klinika radiologie a nukleární medicíny – LF MU a FN Brno 3;  Oddělení nukleární medicíny Masarykův onkologický ústav Brno 4;  Chirurgická klinika LF a FN Brno 5
Published in: Vnitř Lék 2023; 69(E-3): 4-15
Category: Case reports
doi: https://doi.org/10.36290/vnl.2023.035

Overview

Idiopathic retroperitoneal fibrosis (IRF) is a rare condition characterized by the development of a peri-aortic and peri-iliac tissue showing chronic inflammatory infiltrates and pronounced fibrosis. Ureteral entrapment with consequent obstructive uropathy is one of the most common complications, which can lead to acute renal failure and, in the long term, to varying degrees of chronic kidney disease. Common symptoms at onset include lower back, abdominal or flank pain, and constitutional symptoms such as malaise, fever, and anorexia and weight loss. Pain is frequently referred to the hip, to the groin and to the lateral regions of the leg, with nocturnal exacerbations, and typically does not modify with position.

We report a case of 56 year-old male with recurrent lower back pain and lower abdominal pain. Contrast-enhanced computed tomography and was suggestive of retroperitoneal fibrosis and unilateral ureteral occlusion. Histologic examination with immunohistochemical staining for IgG4 demonstrate IgG4-related retroperitoneal fibrosis. Therapy was started with prednison 1 mg/kg, but the tolerance of this dose was poor. Therefore the therapy was switched to combination of rituximab 375 mg/ m2 on day 1, cyclophosphamide 300 mg/m2 mg infusion and dexamethasone 20 mg total dose infusion on day 1 and 15 in 28 days cycle. FDG-PET/CT control in fourth month showed residual accumulation of FDG in retroperitoneal fibrotic mass, and therefore the therapy was prolonged to 8 month. The subjective symptoms of this diseases disappeared in the 8th month. Then the maintenance therapy, administration of rituximab in 6 month interval, was started.

The activity of this disease be further evaluated by FDG-PET/CT imagination.

Glucocorticoids are considered the cornerstone of therapy. The use of other immunosuppressive agents, including cyclophosphamide, azathioprine, methotrexate, mycophenolate mofetil and biological agents such as rituximab, tocilizumab and infliximab and sirolimus have been reported as a valuable option mostly in case reports, cases series and small studies. This agents allowed to reduce cumulative dose of glucocorticoids and its adverse effects. Therefore in our patients we preferred combination of rituximab cyclophosphamide s dexamethasone with lover dose of prednisonem.

This combination is preferable for patients who cannot tolerate glucocorticoids or who are likely to suffer from significant glucocorticoids -related toxicity.

Keywords:

Cyclophosphamide – rituximab – retroperitoneal fibrosis – IgG4 related disease


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