- Patients who are eligible for this study may also be eligible for and participate in National Cancer Institute (NCI) Protocol 9167, titled "Positron Emission Tomography (PET) with 18F-Fluoroestradiol (FES) as a Predictor of Response in Patients with Breast Cancer Scheduled to Be Treated with MK-2206 in Combination with Either an Aromatase Inhibitor or Fulvestrant on NCI Protocol 8762," in which case the FES-PET in Protocol 9167 has to be performed a minimum of 48 hours and a maximum of 30 days before the first dose of MK-2206; in addition, all FES-related side effects must have resolved before the first dose of MK-2206