Is there a place for cyclophosphamide in the treatment of giant-cell arteritis? A case series and systematic review.

Objective: To report on the effectiveness of cyclophosphamide (CYC) to treat glucocorticoid (GC)-dependent giant-cell arteritis (GCA) and/or severe GC-related side effects.

Methods: Fifteen patients with GCA and treated with CYC were retrieved from the computerized patient-record system. Glucocorticoid dependence was defined as a prednisone dose of >20mg/day for 6 months or >10mg/day for 1 year in order not to relapse. Response to CYC was defined as improved clinical and biological findings. Remission was defined as a sustained absence (>12 months) of active signs of vasculitis at a daily GC dose of <7.5mg. A literature review searched PubMed for all patients diagnosed with GCA and who received CYC.

Results: Our 15 patients responded to monthly pulses of CYC, and all experienced a GC-sparing effect, including five patients who discontinued GC long term. At a median follow-up of 43 (range: 14-75) months after CYC, nine (53%) patients were still in remission and six (40%) had relapsed at 6 (3-36) months after the last CYC infusion. Twelve (80%) patients experienced side effects, leading to discontinuation of CYC in two (13%). A literature review retrieved 88 patients who received CYC: 66 for GC-dependent disease, 53 for GC toxicity, and 14 for severe organ involvement. Their median follow-up time was 24 (4-60) months. Among the 88 patients, 74 (84%) were responsive to CYC and 17 (19%) relapsed, although all were receiving a maintenance therapy with immunosuppressive agents (such as methotrexate). Twenty-nine (33%) patients experienced side effects and 11 (12.5%) discontinued treatment.

Conclusion: Cyclophosphamide is an interesting option for GCA patients with GC-dependent disease or with severe GC-related side effects, especially when conventional immunosuppressive agents have failed.