This study focuses on patients with a specific stage of prostate cancer known as metastatic, castration-sensitive or metastatic, castration-resistant prostate cancer who are still receiving androgen targeting therapy (a type of prostate cancer therapy). The purpose of the study is to examine the role of glutamine (amino acid or component of protein found in our bodies and a variety of foods), 4E-BP1 (molecule involved in glutamine metabolism), and T-cell (immune cell) levels in the blood of these patients with prostate cancer. Researchers want to know whether the levels help predict benefit from prostate cancer therapies and the likely course of prostate cancer. Study procedures include blood collections and medical history review.

• CS Cancer at Beverly Hills
• CS Cancer at Cedars-Sinai Medical Center