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Objectives SSc is a autoimmune disease characterized by fibrosis of the skin and internal organs. There is a lack of evidence for the efficacy of i.v. CYC pulse therapy on skin thickening. We aimed to examine the response of i.v. CYC pulse therapy on skin thickening in our cohort of SSc patients and analysed factors that predict this response. Methods We retrospectively evaluated the data for 143 patients with SSc from baseline to 12, 24 and 36 months. All patients were treated with at least 6 i.v. CYC pulses (750 mg/m2/month). We applied the modified Rodnan Skin Score (mRSS) to assess skin thickening. A clinically relevant response was defined as a decrease in mRSS of 5 points and 25% from baseline. Different baseline variables for predicting response on month 12 were tested in logistic regression analyses. Results Baseline characteristics of the patients with dcSSc and lcSSc were collected. Forty-three percent (n = 42) of dcSSc patients had a clinically relevant response on month 12. Non-responding on month 6 predicts non-response on month 12 (odds ratio 37.1; 95% CI 4.5, 306.4). Conclusion We concluded that i.v. CYC pulse therapy should be considered as an effective treatment option for skin thickening in dcSSc patients, because 43% of this group of patients were found to have a clinically relevant response. Of the dcSSC patients who did not respond by month 6, only 29% had a response by month 12. This finding can help the physician and patient in shared decision making about whether or not to continue therapy.

Treatment with cyclophosphamide i.v. pulse therapy is an option for effective treatment of skin fibrosis in patients with early systemic sclerosis