Quantitative PTEN protein expression is associated with pertuzumab sensitivity in vitro and trastuzumab resistance in vivo. Quantitative PTEN protein expression.

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Presentation transcript:

Quantitative PTEN protein expression is associated with pertuzumab sensitivity in vitro and trastuzumab resistance in vivo. Quantitative PTEN protein expression is associated with pertuzumab sensitivity in vitro and trastuzumab resistance in vivo. A, relative sensitivity of 13 ovarian carcinoma cell lines to the HER2 dimerization inhibitor pertuzumab was determined by growth assay [sulforhodamine B (SRB) assay], and expression of PTEN and other MAPK and PI3K pathway components was assessed by semiquantitative Western blotting. B, left, AQUA fluorescent analysis of PTEN expression in a TMA core, showing mainly cytoplasmic localization of PTEN (red) and masking of tumor areas for quantification by cytokeratin (green); middle, calculation of optimal cutpoint for PTEN expression. X-tile calculates all possible combinations of results for different cutpoints (top) and corresponding relative risks (bottom). Cutpoint is selected on the best-corrected Monte-Carlo P value. Right, Kaplan-Meier survival curves for patients treated with trastuzumab for low (blue) and high (red) protein expression of PTEN. Overall survival is calculated from time of initial diagnosis to date of death. Dana Faratian et al. Cancer Res 2009;69:6713-6720 ©2009 by American Association for Cancer Research