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要旨●患者は40歳代,女性.臨床病期IVの右脈絡膜悪性黒色腫に対して抗PD-1抗体ニボルマブを使用するも,多発肺転移を認めたため抗CTLA-4抗体イピリムマブに治療を変更したところ下痢が出現した.大腸内視鏡検査では終末回腸およびBauhin弁の発赤と上行結腸から直腸に及ぶ白斑が認められた.生検では陰窩上皮に顕著なアポトーシスがみられた.諸検査の結果,感染症は否定的であったため,免疫チェックポイント阻害薬関連腸炎と診断した.ステロイド治療を行い,速やかに症状の改善を認めたが,その後ランソプラゾールに関連すると思われるcollagenous colitisを併発した.
A 48-year-old woman was treated with nivolumab for advanced malignant melanoma. The medication was switched to ipilimumab because of progressive disease. The patient was admitted to our hospital with the complaints of diarrhea. Colonoscopy revealed erythematous mucosa in the terminal ileum and white spots in the region between the ascending colon and the rectum. The examination of biopsy specimens obtained from the colon revealed dense inflammatory infiltrates, including lymphocytes, neutrophils, and apoptotic bodies. CD toxin and stool culture test results were negative. Thus, a diagnosis of immune checkpoint inhibitor-induced colitis, an immune-related adverse effect, was established. Prednisolone(30mg/d)administration resulted in immediate alleviation of the patient's symptoms. However, she developed collagenous colitis that was presumed to be associated with lansoprazole.
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