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- W2171599034 abstract "8553 Background: Although the introduction of selective BRAF inhibitors has been a major advance in treatment of metastatic melanoma, approximately 50% of patients have limited responses including stabilisation of disease or no response at all. The present study aims to identify a novel means of overcoming resistance of melanoma to killing by BRAF inhibitors. Methods: We examined the influence of the BH3 mimetic ABT-737 on induction of apoptosis by the selective BRAF inhibitor PLX4720 on a panel of melanoma cells with BRAF V600E mutations with or without mutations of CDK4 and BRAF wildtype cells with or without NRAS mutations. Included in the studies were cell lines established from 4 patients before and during treatment with selective BRAF inhibitors. Results: Cell lines with no or low sensitivity to PLX 4720 underwent synergistic increases and increased rates of apoptosis when combined with ABT-737. This degree of synergism was not seen in cell lines without BRAF V600E mutations. Apoptosis was mediated through the mitochondrial pathway and was due in part to upregulation of Bim as shown by inhibition of apoptosis following siRNA knockdown of Bim. Similar effects were seen in cell lines established from patients prior to treatment but not in lines from patients clinically resistant to the selective BRAF inhibitors. Conclusions: These results suggest that combination of selective BRAF inhibitors with ABT-737 or the oral form ABT-263 may increase the degree and rate of responses in previously untreated patients with V600E melanoma but not in those with acquired resistance to these agents." @default.
- W2171599034 created "2016-06-24" @default.
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- W2171599034 date "2012-05-20" @default.
- W2171599034 modified "2023-09-24" @default.
- W2171599034 title "Effect of the BH3 mimetic ABT-737 on human melanoma cells to apoptosis induced by selective BRAF inhibitors." @default.
- W2171599034 doi "https://doi.org/10.1200/jco.2012.30.15_suppl.8553" @default.
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