Using the cobblestone area (CA) formation inhibitory activity of human leukemic stem cell-like cells as an indicator, a fraction having the activity has been extracted from the fat-soluble fraction of Porifera, then, a compound having the activity has been isolated and purified from the aforementioned fraction, and then, the structure thereof has been determined, so that a Stelliferin compound comprising a novel compound has been identified. Moreover, it has been found that the isolated and purified Stelliferin compound significantly suppresses the niche formation of leukemic stem cell-like cells derived from human chronic myelogenous leukemia (CML) having resistance to existing antitumor agents and enhances the effects of antitumor agents on the cells. The present invention provides a pharmaceutical composition having inhibitory or suppressive activity against the niche formation of leukemic stem cells, a prophylactic agent against the recurrence of malignant tumor, which involves the combined use of other antitumor drugs, and the like.
以人类白血病干细胞样细胞的鹅卵石区(CA)形成抑制活性为指标,从多孔菌的脂溶性馏分中提取出具有该活性的馏分,然后从上述馏分中分离纯化出具有该活性的化合物,并确定了其结构,从而确定了一种包含新型化合物的Stelliferin化合物。此外,研究还发现,分离纯化的星藻素化合物可显著抑制对现有
抗肿瘤药物具有抗药性的人类慢性骨髓性白血病(CML)白血病干细胞样细胞的龛形成,并增强
抗肿瘤药物对该细胞的作用。本发明提供了一种对白血病干细胞龛形成具有抑制或抑制活性的药物组合物,一种预防恶性肿瘤复发的药物,其中包括联合使用其他
抗肿瘤药物等。