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要約 目的:マイトジェン活性化プロテインキナーゼ(MEK)阻害薬であるセルメチニブ内服中に漿液性網膜剝離を生じた症例において,マイクロペリメータMP-3(ニデック社)を用いて視野感度低下を評価したので報告する。
症例:18歳,女性。神経線維腫症1型にて,名古屋大学医学部附属病院(以下,当院)整形外科でX日からセルメチニブ50mg/日の内服処方が開始となり,合併症評価のため当院眼科へ紹介された。
所見:初診時(X+17日)は眼底に特記すべき異常所見はなく,矯正視力は両眼ともに1.0であった。再診時(X+168日),自覚症状・矯正視力に変化はなかったが,光干渉断層計(OCT)にて両眼黄斑部に網膜下液(SRF)を認め,セルメチニブは休薬とした。X+196日,SRFは消退傾向がみられ,セルメチニブの内服を35mg/日で再開とし,その後の再発は認めなかった。X+168日,X+196日,X+308日におけるMP-3の結果の反復測定分散分析では,両眼で経過とともに有意な網膜感度の改善傾向を認めた(p<0.001)。
結論:MEK阻害薬内服に伴う漿液性網膜剝離は休薬により改善が見込まれ,内服再開時には内服量の調整で再燃をコントロールできる可能性もあり,主科との連携が重要である。さらに,視力低下の自覚はみられなかったものの網膜感度の低下が生じていたことから,OCTや視野検査による定期的な経過観察が重要である。
Abstract Purpose:To report a case of serous retinal detachment during treatment with selumetinib, a mitogen-activated protein kinase(MEK)inhibitor, where decreased visual field sensitivity was evaluated using an MP-3 microperimeter(MP-3).
Case:An 18-year-old female patient with neurofibromatosis type 1 was prescribed 50 mg/day of selumetinib by the department of orthopedic surgery at Nagoya University Hospital(hereafter referred to as “our hospital”)on day X. She was referred to our ophthalmology clinic for an initial visit to evaluate ophthalmic complications. At the initial visit on X+17 days, there were no significant findings in the fundus, and corrected visual acuity was(1.0)in both eyes. On X+168 days, optical coherence tomography(OCT)showed the appearance of subretinal fluid(SRF)in the macular region of both eyes, prompting discontinuation of selumetinib. On X+196 days, SRF showed a tendency to resolve. Selumetinib was resumed at a reduced dose of 35 mg/day and no recurrence of SRF was noted until X+308 days. The repeated measure analysis of variance for MP-3 at X+168 days, X+196 days, and X+308 days showed a significant trend of improved retinal sensitivity with time(p<0.001)in both eyes.
Conclusion:Serous retinal detachment associated with MEK inhibitor therapy typically resolves after drug withdrawal, and relapse may be managed by adjusting the dose when the medication is reintroduced;thus, close collaboration with the primary care team is essential. In addition, since the patient did not have subjective vision loss, but had decreased retinal sensitivity, regular monitoring with OCT and visual field testing is essential.

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