PROBLEM TO BE SOLVED: To provide a melanoma cell line having an effect that cannot be achieved by a conventional technique and expressing shared immunodominant melanoma antigens, and to provide a method of using the same.SOLUTION: A method for treating or preventing against melanoma that comprises step of :(a) obtaining a melanoma cell line that expresses one or more shared immunodominant melanoma antigens; (b) modifying the melanoma cell line to render it capable of producing an increased level of a cytokine relative to the unmodified cell line; and (c) administering the melanoma cell line to a mammalian host that has melanoma or is at risk for developing melanoma.【課題】従来技術では達成できなかった効果を有する、免疫優性な共有黒色腫抗原を発現する黒色腫細胞株およびその使用方法の提供。【解決手段】(a) 1または2以上の免疫優性な共有黒色腫抗原を発現する黒色腫細胞株を取得し、 (b) 未改変黒色腫細胞株に比べてサイトカインの産生レベルが増加し得るように該黒色腫細胞株を改変し、(c) 黒色腫を有するかあるいは黒色腫が発生する危険のある哺乳動物宿主に該黒色腫細胞株を投与することを含む、黒色腫の治療または予防方法。【選択図】なし