The compositions and methods include targeting peptides selective for tissue selective binding, particularly prostate and / or bone cancer, or adipose tissue. The methods may comprise targeting peptides that bind, for example, cell surface GRP78, IL-11Rα in blood vessels of bone, or prohibitin of adipose vascular tissue. These peptides may be used to induce targeted apoptosis in the presence or absence of at least one pro-apoptotic peptide. Antibodies against such targeting peptides, the targeting peptides, or their mimeotopes may be used for detection, diagnosis and / or staging of a condition, such as prostate cancer or metastatic prostate cancer.