PROBLEM TO BE SOLVED: To provide a breast cancer cell proliferation inhibitor and the like based on a mechanism of action which has not been known conventionally.;SOLUTION: The invention relates to a cytostatic agent of breast cancer cells which inhibits ERK1/2 activity or Bcl-xL expression. The invention also relates to a cytostatic method of breast cancer cells comprising inhibiting ERK1/2 activity or inhibiting Bcl-xL expression by continuously placing the breast cancer cells under the presence of nobiletin.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2016,JPO&INPIT
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