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Ipilimumab is an anti-cytotoxic T lymphocyte antigen 4 (CTLA-4) antibody. Ipilimumab has shown improvement in overall survival in patients with advanced melanoma. Because ipilimumab activates the immune system against the tumor, ipilimumab is associated with adverse events related to immune system activation. Immune-associated side effects are frequently seen in the gastrointestinal system and skin. Sweet's syndrome (SS) is an uncommon inflammatory disorder. Some drugs or malignancy can cause SS. Only a few case reports have been reported of ipilimumab-associated SS. A 53-year-old female with metastatic melanoma was treated with ipilimumab. After the fourth cycle, she developed painful lesions on her legs and hands. The pathologic biopsy of the lesions revealed neutrophilic dermatosis consistent with SS.Management and outcome: The patient was treated with 60 mg/day of prednisone for four days, nonsteroidal anti-inflammatory drugs and inhaler bronchodilator and steroid. She had symptomatic relief at the beginning of treatment. The prednisone doses were quickly tapered every three days. When the patient was treated with 10 mg/day of prednisone for three days, the skin nodules recurred. Prednisone 40 mg per day was re-started and then a slower taper by decreasing by 10 mg/day every week was instituted. After one-month treatment the prednisone dose was given as a 5 mg doses for one week and then stopped. No new lesions recurred after slower taper of prednisone. Herein we report a case presented with SS under ipilimumab therapy. Melanoma patients treated with ipilimumab can develop SS. The clinicians should be aware of this condition.


Hatime A Yaşar, Erman Akkus, Aylin Heper, Bengu N Akay, Yuksel Urun, Gungor Utkan. Sweet's syndrome under ipilimumab therapy and a brief comparison of the cases in literature. Journal of oncology pharmacy practice : official publication of the International Society of Oncology Pharmacy Practitioners. 2020 Oct;26(7):1762-1764

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PMID: 32089071

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