It is intended to induce cell death and/or inhibit cell growth for cells having a mutation in BRAF gene. The agents of the present invention comprise, as active ingredients, a drug inhibiting GST-π.本發明針對具有BRAF基因突變之細胞誘導細胞死亡及/或抑制細胞增殖。本發明包含抑制GST-π之藥物作為有效成分。