Placental cells, for example, used a population of placental cells such and placental stem cells, as described herein, the cells of the bone-related cancer, for example, a method of inhibiting the growth and proliferation of chondrosarcoma cells this or multiple myeloma are provided in the specification. Method of treating an individual having a bone-related cell cancer are also provided herein. [Selection] Figure Figure 1胎盤細胞、例えば、本明細書に記載の胎盤幹細胞、及びそのような胎盤細胞の集団を用いる、骨関連癌の細胞、例えば、多発性骨髄腫又は軟骨肉腫細胞の増殖及び成長の抑制方法が本明細書で提供される。骨関連癌の細胞を有する個体を治療する方法も本明細書で提供される。【選択図】図1