Untargeted stable isotope-resolved metabolomics to assess the effect of PI3Kβ inhibition on metabolic pathway activities in a PTEN null breast cancer cell line oleh Marcel Lackner, Marcel Lackner, Sylvia K. Neef, Sylvia K. Neef, Stefan Winter, Stefan Winter, Sandra Beer-Hammer, Sandra Beer-Hammer, Bernd Nürnberg, Matthias Schwab, Matthias Schwab, Matthias Schwab, Matthias Schwab, Ute Hofmann, Ute Hofmann, Mathias Haag, Mathias Haag