For in vitro experiments, a 2.5 mM stock of Palbociclib was prepared in DMSO and stored as single use aliquots at -80ºC.
For in vivo experiments, Palbociclib was dissolved in Sodium L-Lactate (Sigma-Aldrich; St. Louis, MO) buffer (50mM, pH 4.0). Cre:ER T+/-PTEN f/f mice were given a single daily dose of 100 mg/kg of Palbociclib by oral gavage, starting two weeks after tamoxifen injection. For Palbociclib acute treatment, Cre-ER T+/-PTEN fl/fl animals were treated for three consecutive days with 75, 100 or 150 mg/kg of the inhibitor. For survival experiments, mice received 5 doses per week until the moment of sacrifice. In each experiment, control animals were given vehicle following the same schemes.