Objective:To evaluate the effects of n-hexane insoluble fraction(HIF)of Ficus septica leaves in combination with doxorubicin on cytotoxicity,cell cycle and apoptosis induction of breast cancer T47D cell lines.Methods:The in vitro drugs-stimulated cytotoxic effects were determined using MTT assay.Analysis of cell cycle distribution was performed using flowcytometer and the data was analyzed using ModFit LT 3.0 program.Apoptosis assay was earned out by double staining method using ethydium bromide-acridin orange.The expression of cleaved-poly(ADP-ribose)polymerase(PARP)on T47D cell lines was identified using immunocytochemistry.Results:The combination exhibited higher inhibitory effect on cell growth than the single treatment of doxorubicin in T47D cells.In addition,combination of doxorubicin and HIF increased the incidence of cells undergoing apoptosis.HIF could improve doxorubicin cytotoxic effect by changing the accumulation of cell cycle phase from G_2/M to G_1 phase.The combination also exhibited upregulation of cleaved-PARP in T47D cells.Conclusions:Based on this results,HIF is potential to be developed as co-chemotherapeutic agent for breast cancer by inducing apoptosis and cell cycle arrest.However,the molecular mechanism need to be explored further. Objective: To evaluate the effects of n-hexane insoluble fraction (HIF) of Ficus septica leaves in combination with doxorubicin on cytotoxicity, cell cycle and apoptosis induction of breast cancer T47D cell lines. Methods: The in vitro drugs-stimulated cytotoxic effects were determined using MTT assay. Analysis of cell cycle distribution was performed using flowcytometer and the data was analyzed using ModFit LT 3.0 program. Apoptosis assay was earned out by double staining method using ethydium bromide-acridin orange. The expression of cleaved-poly (ADP-ribose Results: The Combination showed higher inhibitory effect on cell growth than the single treatment of doxorubicin in T47D cells. In addition, combination of doxorubicin and HIF increased the incidence of cells undergoing apoptosis .HIF could improve doxorubicin cytotoxic effect by changing the accumulation of cell cycle phase from G_2 / M to G_1 phase. Combination also exhibited upregulation of cleaved-PARP in T47D cells. Conclusion: Based on this results, HIF is potential to be developed as co-chemotherapeutic agent for breast cancer by inducing apoptosis and cell cycle arrest. However, the molecular mechanism need to be explored further .